]> git.uio.no Git - u/mrichter/AliRoot.git/blobdiff - TRD/AliTRDgeometry.cxx
TPCNoiseMapComponent included into build (Kelly)
[u/mrichter/AliRoot.git] / TRD / AliTRDgeometry.cxx
index fbb6f80fabc189b3bd6f7301eb4fddbbd6d97f5d..4bd3dcd1f4bf6cea5423c4371f0864982ece5784 100644 (file)
 #include "AliLog.h"
 #include "AliRunLoader.h"
 #include "AliAlignObj.h"
-#include "AliAlignObjAngles.h"
+#include "AliAlignObjParams.h"
 #include "AliRun.h"
 
 #include "AliTRD.h"
 #include "AliTRDcalibDB.h"
-#include "AliTRDCommonParam.h"
 #include "AliTRDgeometry.h"
 #include "AliTRDpadPlane.h"
 
@@ -54,11 +53,19 @@ ClassImp(AliTRDgeometry)
   // Dimensions of the detector
   //
 
-  // Parameter of the BTRD mother volumes 
+  // Total length of the TRD mother volume
+  const Float_t  AliTRDgeometry::fgkTlength   = 751.0;
+
+  // Parameter of the super module mother volumes 
   const Float_t  AliTRDgeometry::fgkSheight   =  77.9; 
   const Float_t  AliTRDgeometry::fgkSwidth1   =  94.881; 
   const Float_t  AliTRDgeometry::fgkSwidth2   = 122.353;
-  const Float_t  AliTRDgeometry::fgkSlength   = 751.0;
+  const Float_t  AliTRDgeometry::fgkSlength   = 702.0;
+
+  // Length of the additional space in front of the supermodule
+  // used for services
+  const Float_t  AliTRDgeometry::fgkFlength   = (AliTRDgeometry::fgkTlength
+                                               - AliTRDgeometry::fgkSlength) / 2.0;
 
   // The super module side plates
   const Float_t  AliTRDgeometry::fgkSMpltT    =   0.2;
@@ -161,10 +168,8 @@ ClassImp(AliTRDgeometry)
 //_____________________________________________________________________________
 AliTRDgeometry::AliTRDgeometry()
   :AliGeometry()
-  ,fMatrixArray(0)
-  ,fMatrixCorrectionArray(0)
-  ,fMatrixGeo(0)
-
+  ,fClusterMatrixArray(0)
+  ,fPadPlaneArray(0)
 {
   //
   // AliTRDgeometry default constructor
@@ -177,9 +182,8 @@ AliTRDgeometry::AliTRDgeometry()
 //_____________________________________________________________________________
 AliTRDgeometry::AliTRDgeometry(const AliTRDgeometry &g)
   :AliGeometry(g)
-  ,fMatrixArray(g.fMatrixArray)
-  ,fMatrixCorrectionArray(g.fMatrixCorrectionArray)
-  ,fMatrixGeo(g.fMatrixGeo)
+  ,fClusterMatrixArray(0)
+  ,fPadPlaneArray(0)
 {
   //
   // AliTRDgeometry copy constructor
@@ -196,14 +200,16 @@ AliTRDgeometry::~AliTRDgeometry()
   // AliTRDgeometry destructor
   //
 
-  if (fMatrixArray) {
-    delete fMatrixArray;
-    fMatrixArray           = 0;
+  if (fClusterMatrixArray) {
+    fClusterMatrixArray->Delete();
+    delete fClusterMatrixArray;
+    fClusterMatrixArray = 0;
   }
 
-  if (fMatrixCorrectionArray) {
-    delete fMatrixCorrectionArray;
-    fMatrixCorrectionArray = 0;
+  if (fPadPlaneArray) {
+    fPadPlaneArray->Delete();
+    delete fPadPlaneArray;
+    fPadPlaneArray = 0;
   }
 
 }
@@ -261,23 +267,259 @@ void AliTRDgeometry::Init()
   Float_t phi = 0.0;
   for (isect = 0; isect < fgkNsect; isect++) {
     phi = 2.0 * TMath::Pi() /  (Float_t) fgkNsect * ((Float_t) isect + 0.5);
-    fRotA11[isect] = TMath::Cos(phi);
-    fRotA12[isect] = TMath::Sin(phi);
-    fRotA21[isect] = TMath::Sin(phi);
-    fRotA22[isect] = TMath::Cos(phi);
-    phi = -1.0 * phi;
     fRotB11[isect] = TMath::Cos(phi);
     fRotB12[isect] = TMath::Sin(phi);
     fRotB21[isect] = TMath::Sin(phi);
     fRotB22[isect] = TMath::Cos(phi);
   }
 
+  // Initialize the SM status
   for (isect = 0; isect < fgkNsect; isect++) {
     SetSMstatus(isect,1);
   }
  
 }
 
+//_____________________________________________________________________________
+void AliTRDgeometry::CreatePadPlaneArray()
+{
+  //
+  // Creates the array of AliTRDpadPlane objects
+  //
+
+  if (fPadPlaneArray) {
+    fPadPlaneArray->Delete();
+    delete fPadPlaneArray;
+  }
+
+  fPadPlaneArray = new TObjArray(fgkNplan * fgkNcham);  
+  for (Int_t iplan = 0; iplan < fgkNplan; iplan++) {
+    for (Int_t icham = 0; icham < fgkNcham; icham++) {
+      Int_t ipp = GetDetectorSec(iplan,icham);
+      fPadPlaneArray->AddAt(CreatePadPlane(iplan,icham),ipp);
+    }
+  }
+
+}
+
+//_____________________________________________________________________________
+AliTRDpadPlane *AliTRDgeometry::CreatePadPlane(Int_t iplan, Int_t icham)
+{
+  //
+  // Creates an AliTRDpadPlane object
+  //
+
+  AliTRDpadPlane *padPlane = new AliTRDpadPlane();
+
+  padPlane->SetPlane(iplan);
+  padPlane->SetChamber(icham);
+
+  padPlane->SetRowSpacing(0.0);
+  padPlane->SetColSpacing(0.0);
+
+  padPlane->SetLengthRim(1.0);
+  padPlane->SetWidthRim(0.5);
+
+  padPlane->SetNcols(144);
+
+  //
+  // The pad plane parameter
+  //
+  switch (iplan) {
+  case 0:
+    if (icham == 2) {
+      // L0C0 type
+      padPlane->SetNrows(12);
+      padPlane->SetLength(108.0);
+      padPlane->SetWidth(92.2);
+      padPlane->SetLengthOPad(8.0);
+      padPlane->SetWidthOPad(0.515);
+      padPlane->SetLengthIPad(9.0);
+      padPlane->SetWidthIPad(0.635);
+      padPlane->SetTiltingAngle(-2.0);
+    }
+    else {
+      // L0C1 type
+      padPlane->SetNrows(16);
+      padPlane->SetLength(122.0);
+      padPlane->SetWidth(92.2);
+      padPlane->SetLengthOPad(7.5);
+      padPlane->SetWidthOPad(0.515);
+      padPlane->SetLengthIPad(7.5);
+      padPlane->SetWidthIPad(0.635);
+      padPlane->SetTiltingAngle(-2.0);
+    }
+    break;
+  case 1:
+    if (icham == 2) {
+      // L1C0 type
+      padPlane->SetNrows(12);
+      padPlane->SetLength(108.0);
+      padPlane->SetWidth(96.6);
+      padPlane->SetLengthOPad(8.0);
+      padPlane->SetWidthOPad(0.585);
+      padPlane->SetLengthIPad(9.0);
+      padPlane->SetWidthIPad(0.665);
+      padPlane->SetTiltingAngle(2.0);
+    }
+    else {
+      // L1C1 type
+      padPlane->SetNrows(16);
+      padPlane->SetLength(122.0);
+      padPlane->SetWidth(96.6);
+      padPlane->SetLengthOPad(7.5);
+      padPlane->SetWidthOPad(0.585);
+      padPlane->SetLengthIPad(7.5);
+      padPlane->SetWidthIPad(0.665);
+      padPlane->SetTiltingAngle(2.0);
+    }
+    break;
+  case 2:
+    if (icham == 2) {
+      // L2C0 type
+      padPlane->SetNrows(12);
+      padPlane->SetLength(108.0);
+      padPlane->SetWidth(101.1);
+      padPlane->SetLengthOPad(8.0);
+      padPlane->SetWidthOPad(0.705);
+      padPlane->SetLengthIPad(9.0);
+      padPlane->SetWidthIPad(0.695);
+      padPlane->SetTiltingAngle(-2.0);
+    }
+    else {
+      // L2C1 type
+      padPlane->SetNrows(16);
+      padPlane->SetLength(129.0);
+      padPlane->SetWidth(101.1);
+      padPlane->SetLengthOPad(7.5);
+      padPlane->SetWidthOPad(0.705);
+      padPlane->SetLengthIPad(8.0);
+      padPlane->SetWidthIPad(0.695);
+      padPlane->SetTiltingAngle(-2.0);
+    }
+    break;
+  case 3:
+    if (icham == 2) {
+      // L3C0 type
+      padPlane->SetNrows(12);
+      padPlane->SetLength(108.0);
+      padPlane->SetWidth(105.5);
+      padPlane->SetLengthOPad(8.0);
+      padPlane->SetWidthOPad(0.775);
+      padPlane->SetLengthIPad(9.0);
+      padPlane->SetWidthIPad(0.725);
+      padPlane->SetTiltingAngle(2.0);
+    }
+    else {
+      // L3C1 type
+      padPlane->SetNrows(16);
+      padPlane->SetLength(136.0);
+      padPlane->SetWidth(105.5);
+      padPlane->SetLengthOPad(7.5);
+      padPlane->SetWidthOPad(0.775);
+      padPlane->SetLengthIPad(8.5);
+      padPlane->SetWidthIPad(0.725);
+      padPlane->SetTiltingAngle(2.0);
+    }
+    break;
+  case 4:
+    if (icham == 2) {
+      // L4C0 type
+      padPlane->SetNrows(12);
+      padPlane->SetLength(108.0);
+      padPlane->SetWidth(109.9);
+      padPlane->SetLengthOPad(8.0);
+      padPlane->SetWidthOPad(0.845);
+      padPlane->SetLengthIPad(9.0);
+      padPlane->SetWidthIPad(0.755);
+      padPlane->SetTiltingAngle(-2.0);
+    }
+    else {
+      // L4C1 type
+      padPlane->SetNrows(16);
+      padPlane->SetLength(143.0);
+      padPlane->SetWidth(109.9);
+      padPlane->SetLengthOPad(7.5);
+      padPlane->SetWidthOPad(0.845);
+      padPlane->SetLengthIPad(9.0);
+      padPlane->SetWidthIPad(0.755);
+      padPlane->SetTiltingAngle(-2.0);
+    }
+    break;
+  case 5:
+    if (icham == 2) {
+      // L5C0 type
+      padPlane->SetNrows(12);
+      padPlane->SetLength(108.0);
+      padPlane->SetWidth(114.4);
+      padPlane->SetLengthOPad(8.0);
+      padPlane->SetWidthOPad(0.965);
+      padPlane->SetLengthIPad(9.0);
+      padPlane->SetWidthIPad(0.785);
+      padPlane->SetTiltingAngle(2.0);
+    }
+    else {
+      // L5C1 type
+      padPlane->SetNrows(16);
+      padPlane->SetLength(145.0);
+      padPlane->SetWidth(114.4);
+      padPlane->SetLengthOPad(8.5);
+      padPlane->SetWidthOPad(0.965);
+      padPlane->SetLengthIPad(9.0);
+      padPlane->SetWidthIPad(0.785);
+      padPlane->SetTiltingAngle(2.0);
+    }
+    break;
+  };
+
+  //
+  // The positions of the borders of the pads
+  //
+  // Row direction
+  //
+  Double_t row = fClength[iplan][icham] / 2.0
+               - fgkRpadW
+               - padPlane->GetLengthRim();
+  for (Int_t ir = 0; ir < padPlane->GetNrows(); ir++) {
+    padPlane->SetPadRow(ir,row);
+    row -= padPlane->GetRowSpacing();
+    if (ir == 0) {
+      row -= padPlane->GetLengthOPad();
+    }
+    else {
+      row -= padPlane->GetLengthIPad();
+    }
+  }
+  //
+  // Column direction
+  //
+  Double_t col = fCwidth[iplan] / 2.0
+               + fgkCroW
+               - padPlane->GetWidthRim();
+  for (Int_t ic = 0; ic < padPlane->GetNcols(); ic++) {
+    padPlane->SetPadCol(ic,col);
+    col -= padPlane->GetColSpacing();
+    if (ic == 0) {
+      col -= padPlane->GetWidthOPad();
+    }
+    else {
+      col -= padPlane->GetWidthIPad();
+    }
+  }
+  // Calculate the offset to translate from the local ROC system into
+  // the local supermodule system, which is used for clusters
+  Double_t rowTmp = fClength[iplan][0]
+                 + fClength[iplan][1]
+                  + fClength[iplan][2] / 2.0;
+  for (Int_t ic = 0; ic < icham; ic++) {
+    rowTmp -= fClength[iplan][ic];
+  }
+  padPlane->SetPadRowSMOffset(rowTmp - fClength[iplan][icham]/2.0);
+
+  return padPlane;
+
+}
+
 //_____________________________________________________________________________
 void AliTRDgeometry::CreateGeometry(Int_t *idtmed)
 {
@@ -336,21 +578,29 @@ void AliTRDgeometry::CreateGeometry(Int_t *idtmed)
   Char_t  cTagV[6];
   Char_t  cTagM[5];
 
-  // The TRD mother volume for one sector (Air), full length in z-direction
+  // There are three TRD volumes for the supermodules in order to accomodate
+  // the different arrangements in front of PHOS
+  // UTR1: Default supermodule
+  // UTR2: Supermodule in front of PHOS with double carbon cover
+  // UTR3: As UTR2, but w/o middle stack
+  //
+  // The mother volume for one sector (Air), full length in z-direction
   // Provides material for side plates of super module
   parTrd[0] = fgkSwidth1/2.0;
   parTrd[1] = fgkSwidth2/2.0;
   parTrd[2] = fgkSlength/2.0;
   parTrd[3] = fgkSheight/2.0;
   gMC->Gsvolu("UTR1","TRD1",idtmed[1302-1],parTrd,kNparTrd);
-
+  gMC->Gsvolu("UTR2","TRD1",idtmed[1302-1],parTrd,kNparTrd);
+  gMC->Gsvolu("UTR3","TRD1",idtmed[1302-1],parTrd,kNparTrd);
   // The outer aluminum plates of the super module (Al)
   parTrd[0] = fgkSwidth1/2.0;
   parTrd[1] = fgkSwidth2/2.0;
   parTrd[2] = fgkSlength/2.0;
   parTrd[3] = fgkSheight/2.0;
   gMC->Gsvolu("UTS1","TRD1",idtmed[1301-1],parTrd,kNparTrd);
-
+  gMC->Gsvolu("UTS2","TRD1",idtmed[1301-1],parTrd,kNparTrd);
+  gMC->Gsvolu("UTS3","TRD1",idtmed[1301-1],parTrd,kNparTrd);
   // The inner part of the TRD mother volume for one sector (Air), 
   // full length in z-direction
   parTrd[0] = fgkSwidth1/2.0 - fgkSMpltT;
@@ -358,6 +608,17 @@ void AliTRDgeometry::CreateGeometry(Int_t *idtmed)
   parTrd[2] = fgkSlength/2.0;
   parTrd[3] = fgkSheight/2.0 - fgkSMpltT;
   gMC->Gsvolu("UTI1","TRD1",idtmed[1302-1],parTrd,kNparTrd);
+  gMC->Gsvolu("UTI2","TRD1",idtmed[1302-1],parTrd,kNparTrd);
+  gMC->Gsvolu("UTI3","TRD1",idtmed[1302-1],parTrd,kNparTrd);
+
+  // The inner part of the TRD mother volume for services in front
+  // of the supermodules  (Air), 
+  parTrd[0] = fgkSwidth1/2.0;
+  parTrd[1] = fgkSwidth2/2.0;
+  parTrd[2] = fgkFlength/2.0;
+  parTrd[3] = fgkSheight/2.0;
+  gMC->Gsvolu("UTF1","TRD1",idtmed[1302-1],parTrd,kNparTrd);
+  gMC->Gsvolu("UTF2","TRD1",idtmed[1302-1],parTrd,kNparTrd);
 
   for (Int_t icham = 0; icham < kNcham; icham++) {
     for (Int_t iplan = 0; iplan < kNplan; iplan++) {  
@@ -376,7 +637,7 @@ void AliTRDgeometry::CreateGeometry(Int_t *idtmed)
       gMC->Gsvolu(cTagV,"BOX ",idtmed[1301-1],parCha,kNparCha);
       // The additional aluminum on the frames
       // This part has not the correct postion but is just supposed to
-      // represent the missing material. The correct from of the L-shaped
+      // represent the missing material. The correct form of the L-shaped
       // profile would not fit into the alignable volume. 
       sprintf(cTagV,"UZ%02d",iDet);
       parCha[0] = fgkCroW/2.0;
@@ -587,12 +848,12 @@ void AliTRDgeometry::CreateGeometry(Int_t *idtmed)
 
       // Position the frames of the chambers in the TRD mother volume
       xpos  = 0.0;
-      ypos  = - fClength[iplan][0] - fClength[iplan][1] - fClength[iplan][2]/2.0;
+      ypos  = fClength[iplan][0] + fClength[iplan][1] + fClength[iplan][2]/2.0;
       for (Int_t ic = 0; ic < icham; ic++) {
-        ypos += fClength[iplan][ic];        
+        ypos -= fClength[iplan][ic];
       }
-      ypos += fClength[iplan][icham]/2.0;
-      zpos  = fgkVrocsm + fgkSMpltT + fgkCraH/2.0 + fgkCdrH/2.0 - fgkSheight/2.0 
+      ypos -= fClength[iplan][icham]/2.0;
+      zpos  = fgkVrocsm + fgkSMpltT + fgkCraH/2.0 + fgkCdrH/2.0 - fgkSheight/2.0
             + iplan * (fgkCH + fgkVspace);
       // The lower aluminum frame, radiator + drift region
       sprintf(cTagV,"UA%02d",iDet);      
@@ -631,11 +892,15 @@ void AliTRDgeometry::CreateGeometry(Int_t *idtmed)
   ypos = 0.0;
   zpos = 0.0;
   gMC->Gspos("UTI1",1,"UTS1",xpos,ypos,zpos,0,"ONLY");
+  gMC->Gspos("UTI2",1,"UTS2",xpos,ypos,zpos,0,"ONLY");
+  gMC->Gspos("UTI3",1,"UTS3",xpos,ypos,zpos,0,"ONLY");
 
   xpos = 0.0;
   ypos = 0.0;
   zpos = 0.0;
   gMC->Gspos("UTS1",1,"UTR1",xpos,ypos,zpos,0,"ONLY");
+  gMC->Gspos("UTS2",1,"UTR2",xpos,ypos,zpos,0,"ONLY");
+  gMC->Gspos("UTS3",1,"UTR3",xpos,ypos,zpos,0,"ONLY");
 
   // Put the TRD volumes into the space frame mother volumes
   // if enabled via status flag
@@ -645,7 +910,35 @@ void AliTRDgeometry::CreateGeometry(Int_t *idtmed)
   for (Int_t isect = 0; isect < kNsect; isect++) {
     if (fSMstatus[isect]) {
       sprintf(cTagV,"BTRD%d",isect);
-      gMC->Gspos("UTR1",1,cTagV,xpos,ypos,zpos,0,"ONLY");
+      switch (isect) {
+      case 13:
+      case 14:
+      case 15:
+        // Double carbon, w/o middle stack
+        gMC->Gspos("UTR3",1,cTagV,xpos,ypos,zpos,0,"ONLY");
+        break;
+      case 11:
+      case 12:
+       // Double carbon, all stacks
+        gMC->Gspos("UTR2",1,cTagV,xpos,ypos,zpos,0,"ONLY");
+        break;
+      default:
+       // Standard supermodule
+        gMC->Gspos("UTR1",1,cTagV,xpos,ypos,zpos,0,"ONLY");
+      };
+    }
+  }
+
+  // Put the TRD volumes into the space frame mother volumes
+  // if enabled via status flag
+  xpos = 0.0;
+  ypos = 0.5*fgkSlength + 0.5*fgkFlength;
+  zpos = 0.0;
+  for (Int_t isect = 0; isect < kNsect; isect++) {
+    if (fSMstatus[isect]) {
+      sprintf(cTagV,"BTRD%d",isect);
+      gMC->Gspos("UTF1",1,cTagV,xpos, ypos,zpos,0,"ONLY");
+      gMC->Gspos("UTF2",1,cTagV,xpos,-ypos,zpos,0,"ONLY");
     }
   }
 
@@ -674,13 +967,103 @@ void AliTRDgeometry::CreateFrame(Int_t *idtmed)
   Char_t  cTagV[5];
   Char_t  cTagM[5];
 
+  const Int_t kNparTRD = 4;
+  Float_t parTRD[kNparTRD];
+  const Int_t kNparBOX = 3;
+  Float_t parBOX[kNparBOX];
+  const Int_t kNparTRP = 11;
+  Float_t parTRP[kNparTRP];
+
   // The rotation matrices
-  const Int_t kNmatrix = 4;
+  const Int_t kNmatrix = 6;
   Int_t   matrix[kNmatrix];
   gMC->Matrix(matrix[0], 100.0,   0.0,  90.0,  90.0,  10.0,   0.0);
   gMC->Matrix(matrix[1],  80.0,   0.0,  90.0,  90.0,  10.0, 180.0);
   gMC->Matrix(matrix[2],  90.0,   0.0,   0.0,   0.0,  90.0,  90.0);
   gMC->Matrix(matrix[3],  90.0, 180.0,   0.0, 180.0,  90.0,  90.0);
+  gMC->Matrix(matrix[4], 170.0,   0.0,  80.0,   0.0,  90.0,  90.0);
+  gMC->Matrix(matrix[5], 170.0, 180.0,  80.0, 180.0,  90.0,  90.0);
+  gMC->Matrix(matrix[6], 180.0, 180.0,  90.0, 180.0,  90.0,  90.0);
+
+  //
+  // The carbon inserts in the top/bottom aluminum plates
+  //
+
+  const Int_t kNparCrb = 3;
+  Float_t parCrb[kNparCrb];
+  parCrb[0] = 0.0;
+  parCrb[1] = 0.0;
+  parCrb[2] = 0.0;
+  gMC->Gsvolu("USCR","BOX ",idtmed[1307-1],parCrb,0);
+  // Bottom 1 (all sectors)
+  parCrb[0] =  77.49/2.0;
+  parCrb[1] = 104.60/2.0;
+  parCrb[2] = fgkSMpltT/2.0;
+  xpos      =   0.0;
+  ypos      =   0.0;
+  zpos      = fgkSMpltT/2.0 - fgkSheight/2.0;
+  gMC->Gsposp("USCR", 1,"UTS1", xpos, ypos, zpos,0,"ONLY",parCrb,kNparCrb);
+  gMC->Gsposp("USCR", 2,"UTS2", xpos, ypos, zpos,0,"ONLY",parCrb,kNparCrb);
+  gMC->Gsposp("USCR", 3,"UTS3", xpos, ypos, zpos,0,"ONLY",parCrb,kNparCrb);
+  // Bottom 2 (all sectors)
+  parCrb[0] =  77.49/2.0;
+  parCrb[1] =  55.80/2.0;
+  parCrb[2] = fgkSMpltT/2.0;
+  xpos      =   0.0;
+  ypos      =  85.6;
+  zpos      = fgkSMpltT/2.0 - fgkSheight/2.0;
+  gMC->Gsposp("USCR", 4,"UTS1", xpos, ypos, zpos,0,"ONLY",parCrb,kNparCrb);
+  gMC->Gsposp("USCR", 5,"UTS2", xpos, ypos, zpos,0,"ONLY",parCrb,kNparCrb);
+  gMC->Gsposp("USCR", 6,"UTS3", xpos, ypos, zpos,0,"ONLY",parCrb,kNparCrb);
+  gMC->Gsposp("USCR", 7,"UTS1", xpos,-ypos, zpos,0,"ONLY",parCrb,kNparCrb);
+  gMC->Gsposp("USCR", 8,"UTS2", xpos,-ypos, zpos,0,"ONLY",parCrb,kNparCrb);
+  gMC->Gsposp("USCR", 9,"UTS3", xpos,-ypos, zpos,0,"ONLY",parCrb,kNparCrb);
+  // Bottom 3 (all sectors)
+  parCrb[0] =  77.49/2.0;
+  parCrb[1] =  56.00/2.0;
+  parCrb[2] = fgkSMpltT/2.0;
+  xpos      =   0.0;
+  ypos      = 148.5;
+  zpos      = fgkSMpltT/2.0 - fgkSheight/2.0;
+  gMC->Gsposp("USCR",10,"UTS1", xpos, ypos, zpos,0,"ONLY",parCrb,kNparCrb);
+  gMC->Gsposp("USCR",11,"UTS2", xpos, ypos, zpos,0,"ONLY",parCrb,kNparCrb);
+  gMC->Gsposp("USCR",12,"UTS3", xpos, ypos, zpos,0,"ONLY",parCrb,kNparCrb);
+  gMC->Gsposp("USCR",13,"UTS1", xpos,-ypos, zpos,0,"ONLY",parCrb,kNparCrb);
+  gMC->Gsposp("USCR",14,"UTS2", xpos,-ypos, zpos,0,"ONLY",parCrb,kNparCrb);
+  gMC->Gsposp("USCR",15,"UTS3", xpos,-ypos, zpos,0,"ONLY",parCrb,kNparCrb);
+  // Bottom 4 (all sectors)
+  parCrb[0] =  77.49/2.0;
+  parCrb[1] = 118.00/2.0;
+  parCrb[2] = fgkSMpltT/2.0;
+  xpos      =   0.0;
+  ypos      = 240.5;
+  zpos      = fgkSMpltT/2.0 - fgkSheight/2.0;
+  gMC->Gsposp("USCR",16,"UTS1", xpos, ypos, zpos,0,"ONLY",parCrb,kNparCrb);
+  gMC->Gsposp("USCR",17,"UTS2", xpos, ypos, zpos,0,"ONLY",parCrb,kNparCrb);
+  gMC->Gsposp("USCR",18,"UTS3", xpos, ypos, zpos,0,"ONLY",parCrb,kNparCrb);
+  gMC->Gsposp("USCR",19,"UTS1", xpos,-ypos, zpos,0,"ONLY",parCrb,kNparCrb);
+  gMC->Gsposp("USCR",20,"UTS2", xpos,-ypos, zpos,0,"ONLY",parCrb,kNparCrb);
+  gMC->Gsposp("USCR",21,"UTS3", xpos,-ypos, zpos,0,"ONLY",parCrb,kNparCrb);
+  // Top 1 (only in front of PHOS)
+  parCrb[0] = 111.48/2.0;
+  parCrb[1] = 105.00/2.0;
+  parCrb[2] = fgkSMpltT/2.0;
+  xpos      =   0.0;
+  ypos      =   0.0;
+  zpos      = fgkSMpltT/2.0 - fgkSheight/2.0;
+  gMC->Gsposp("USCR",22,"UTS2", xpos, ypos,-zpos,0,"ONLY",parCrb,kNparCrb);
+  gMC->Gsposp("USCR",23,"UTS3", xpos, ypos,-zpos,0,"ONLY",parCrb,kNparCrb);
+  // Top 2 (only in front of PHOS)
+  parCrb[0] = 111.48/2.0;
+  parCrb[1] =  56.00/2.0;
+  parCrb[2] = fgkSMpltT/2.0;
+  xpos      =   0.0;
+  ypos      =  85.5;
+  zpos      = fgkSMpltT/2.0 - fgkSheight/2.0;
+  gMC->Gsposp("USCR",24,"UTS2", xpos, ypos,-zpos,0,"ONLY",parCrb,kNparCrb);
+  gMC->Gsposp("USCR",25,"UTS3", xpos, ypos,-zpos,0,"ONLY",parCrb,kNparCrb);
+  gMC->Gsposp("USCR",26,"UTS2", xpos,-ypos,-zpos,0,"ONLY",parCrb,kNparCrb);
+  gMC->Gsposp("USCR",27,"UTS3", xpos,-ypos,-zpos,0,"ONLY",parCrb,kNparCrb);
 
   //
   // The chamber support rails
@@ -707,6 +1090,10 @@ void AliTRDgeometry::CreateFrame(Int_t *idtmed)
           + iplan * (fgkCH + fgkVspace);
     gMC->Gspos("USRL",iplan+1         ,"UTI1", xpos,ypos,zpos,0,"ONLY");
     gMC->Gspos("USRL",iplan+1+  kNplan,"UTI1",-xpos,ypos,zpos,0,"ONLY");
+    gMC->Gspos("USRL",iplan+1+2*kNplan,"UTI2", xpos,ypos,zpos,0,"ONLY");
+    gMC->Gspos("USRL",iplan+1+3*kNplan,"UTI2",-xpos,ypos,zpos,0,"ONLY");
+    gMC->Gspos("USRL",iplan+1+4*kNplan,"UTI3", xpos,ypos,zpos,0,"ONLY");
+    gMC->Gspos("USRL",iplan+1+5*kNplan,"UTI3",-xpos,ypos,zpos,0,"ONLY");
   }
 
   //
@@ -764,23 +1151,15 @@ void AliTRDgeometry::CreateFrame(Int_t *idtmed)
     zpos  = fgkVrocsm + fgkSMpltT + parSCB[2] - fgkSheight/2.0 
           + iplan * (fgkCH + fgkVspace);
 
-    ypos  =   fgkSlength/2.0 - kSCBwid/2.0;
-    gMC->Gspos(cTagV,1,"UTI1", xpos,ypos,zpos,0,"ONLY");
-
     ypos  =   fClength[iplan][2]/2.0 + fClength[iplan][1];
-    gMC->Gspos(cTagV,2,"UTI1", xpos,ypos,zpos,0,"ONLY");
-
-    ypos  =   fClength[iplan][2]/2.0;
-    gMC->Gspos(cTagV,3,"UTI1", xpos,ypos,zpos,0,"ONLY");
-
-    ypos  = - fClength[iplan][2]/2.0;
-    gMC->Gspos(cTagV,4,"UTI1", xpos,ypos,zpos,0,"ONLY");
+    gMC->Gspos(cTagV, 1,"UTI1", xpos,ypos,zpos,0,"ONLY");
+    gMC->Gspos(cTagV, 3,"UTI2", xpos,ypos,zpos,0,"ONLY");
+    gMC->Gspos(cTagV, 5,"UTI3", xpos,ypos,zpos,0,"ONLY");
 
     ypos  = - fClength[iplan][2]/2.0 - fClength[iplan][1];
-    gMC->Gspos(cTagV,5,"UTI1", xpos,ypos,zpos,0,"ONLY");
-
-    ypos  = - fgkSlength/2.0 + kSCBwid/2.0;
-    gMC->Gspos(cTagV,6,"UTI1", xpos,ypos,zpos,0,"ONLY");
+    gMC->Gspos(cTagV, 2,"UTI1", xpos,ypos,zpos,0,"ONLY");
+    gMC->Gspos(cTagV, 4,"UTI2", xpos,ypos,zpos,0,"ONLY");
+    gMC->Gspos(cTagV, 6,"UTI3", xpos,ypos,zpos,0,"ONLY");
 
   }
 
@@ -805,11 +1184,293 @@ void AliTRDgeometry::CreateFrame(Int_t *idtmed)
     zpos  = fgkVrocsm + fgkSMpltT - kSCHhgt/2.0 - fgkSheight/2.0 
           + (iplan+1) * (fgkCH + fgkVspace);
     gMC->Gspos(cTagV,1,"UTI1", xpos,ypos,zpos,0,"ONLY");
+    gMC->Gspos(cTagV,3,"UTI2", xpos,ypos,zpos,0,"ONLY");
+    gMC->Gspos(cTagV,5,"UTI3", xpos,ypos,zpos,0,"ONLY");
     ypos  = -ypos;
     gMC->Gspos(cTagV,2,"UTI1", xpos,ypos,zpos,0,"ONLY");
+    gMC->Gspos(cTagV,4,"UTI2", xpos,ypos,zpos,0,"ONLY");
+    gMC->Gspos(cTagV,6,"UTI3", xpos,ypos,zpos,0,"ONLY");
 
   }
 
+  //
+  // The aymmetric flat frame in the middle
+  //
+
+  // The envelope volume (aluminum)
+  parTRD[0]  =  87.60/2.0;
+  parTRD[1]  = 114.00/2.0;
+  parTRD[2]  =   1.20/2.0;
+  parTRD[3]  =  71.30/2.0;
+  gMC->Gsvolu("USDB","TRD1",idtmed[1301-1],parTRD,kNparTRD);
+  // Empty spaces (air)
+  parTRP[ 0] =   1.20/2.0;
+  parTRP[ 1] =   0.0;
+  parTRP[ 2] =   0.0;
+  parTRP[ 3] =  27.00/2.0;
+  parTRP[ 4] =  50.60/2.0;
+  parTRP[ 5] =   5.00/2.0;
+  parTRP[ 6] =   3.5;
+  parTRP[ 7] =  27.00/2.0;
+  parTRP[ 8] =  50.60/2.0;
+  parTRP[ 9] =   5.00/2.0;
+  parTRP[10] =   3.5;
+  gMC->Gsvolu("USD1","TRAP",idtmed[1302-1],parTRP,kNparTRP);
+  xpos       =  18.0;
+  ypos       =   0.0;
+  zpos       =   27.00/2.0 - 71.3/2.0;
+  gMC->Gspos("USD1",1,"USDB", xpos, ypos, zpos,matrix[2],"ONLY");
+  // Empty spaces (air)
+  parTRP[ 0] =   1.20/2.0;
+  parTRP[ 1] =   0.0;
+  parTRP[ 2] =   0.0;
+  parTRP[ 3] =  33.00/2.0;
+  parTRP[ 4] =   5.00/2.0;
+  parTRP[ 5] =  62.10/2.0;
+  parTRP[ 6] =   3.5;
+  parTRP[ 7] =  33.00/2.0;
+  parTRP[ 8] =   5.00/2.0;
+  parTRP[ 9] =  62.10/2.0;
+  parTRP[10] =   3.5;
+  gMC->Gsvolu("USD2","TRAP",idtmed[1302-1],parTRP,kNparTRP);
+  xpos       =  21.0;
+  ypos       =   0.0;
+  zpos       =  71.3/2.0 - 33.0/2.0;
+  gMC->Gspos("USD2",1,"USDB", xpos, ypos, zpos,matrix[2],"ONLY");
+  // Empty spaces (air)
+  parBOX[ 0] =  22.50/2.0;
+  parBOX[ 1] =   1.20/2.0;
+  parBOX[ 2] =  70.50/2.0;
+  gMC->Gsvolu("USD3","BOX ",idtmed[1302-1],parBOX,kNparBOX);
+  xpos       = -25.75;
+  ypos       =   0.0;
+  zpos       =   0.4;
+  gMC->Gspos("USD3",1,"USDB", xpos, ypos, zpos,        0,"ONLY");
+  // Empty spaces (air)
+  parTRP[ 0] =   1.20/2.0;
+  parTRP[ 1] =   0.0;
+  parTRP[ 2] =   0.0;
+  parTRP[ 3] =  25.50/2.0;
+  parTRP[ 4] =   5.00/2.0;
+  parTRP[ 5] =  65.00/2.0;
+  parTRP[ 6] =  -1.0;
+  parTRP[ 7] =  25.50/2.0;
+  parTRP[ 8] =   5.00/2.0;
+  parTRP[ 9] =  65.00/2.0;
+  parTRP[10] =  -1.0;
+  gMC->Gsvolu("USD4","TRAP",idtmed[1302-1],parTRP,kNparTRP);
+  xpos       =   2.0;
+  ypos       =   0.0;
+  zpos       =  -1.6;
+  gMC->Gspos("USD4",1,"USDB", xpos, ypos, zpos,matrix[6],"ONLY");
+  // Empty spaces (air)
+  parTRP[ 0] =   1.20/2.0;
+  parTRP[ 1] =   0.0;
+  parTRP[ 2] =   0.0;
+  parTRP[ 3] =  23.50/2.0;
+  parTRP[ 4] =  63.50/2.0;
+  parTRP[ 5] =   5.00/2.0;
+  parTRP[ 6] =  16.0;
+  parTRP[ 7] =  23.50/2.0;
+  parTRP[ 8] =  63.50/2.0;
+  parTRP[ 9] =   5.00/2.0;
+  parTRP[10] =  16.0;
+  gMC->Gsvolu("USD5","TRAP",idtmed[1302-1],parTRP,kNparTRP);
+  xpos       =  36.5;
+  ypos       =   0.0;
+  zpos       =  -1.5;
+  gMC->Gspos("USD5",1,"USDB", xpos, ypos, zpos,matrix[5],"ONLY");
+  // Empty spaces (air)
+  parTRP[ 0] =   1.20/2.0;
+  parTRP[ 1] =   0.0;
+  parTRP[ 2] =   0.0;
+  parTRP[ 3] =  70.50/2.0;
+  parTRP[ 4] =   4.50/2.0;
+  parTRP[ 5] =  16.50/2.0;
+  parTRP[ 6] =  -5.0;
+  parTRP[ 7] =  70.50/2.0;
+  parTRP[ 8] =   4.50/2.0;
+  parTRP[ 9] =  16.50/2.0;
+  parTRP[10] =  -5.0;
+  gMC->Gsvolu("USD6","TRAP",idtmed[1302-1],parTRP,kNparTRP);
+  xpos       = -43.7;
+  ypos       =   0.0;
+  zpos       =   0.4;
+  gMC->Gspos("USD6",1,"USDB", xpos, ypos, zpos,matrix[2],"ONLY");
+  xpos       =   0.0;
+  ypos       =   fClength[5][2]/2.0;
+  zpos       =   0.0;
+  gMC->Gspos("USDB",1,"UTI1", xpos, ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USDB",2,"UTI1", xpos,-ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USDB",3,"UTI2", xpos, ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USDB",4,"UTI2", xpos,-ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USDB",5,"UTI3", xpos, ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USDB",6,"UTI3", xpos,-ypos, zpos,        0,"ONLY");
+  // Upper bar (aluminum)
+  parBOX[0] = 95.00/2.0;
+  parBOX[1] =  1.20/2.0;
+  parBOX[2] =  3.00/2.0;
+  gMC->Gsvolu("USD7","BOX ",idtmed[1301-1],parBOX,kNparBOX);
+  xpos       =   0.0;
+  ypos       =   fClength[5][2]/2.0;
+  zpos       =   fgkSheight/2.0 - fgkSMpltT  - 3.00/2.0;
+  gMC->Gspos("USD7",1,"UTI1", xpos, ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USD7",2,"UTI1", xpos,-ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USD7",3,"UTI2", xpos, ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USD7",4,"UTI2", xpos,-ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USD7",5,"UTI3", xpos, ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USD7",6,"UTI3", xpos,-ypos, zpos,        0,"ONLY");
+  // Lower bar (aluminum)
+  parBOX[0] = 90.22/2.0;
+  parBOX[1] =  1.20/2.0;
+  parBOX[2] =  1.90/2.0;
+  gMC->Gsvolu("USD8","BOX ",idtmed[1301-1],parBOX,kNparBOX);
+  xpos       =   0.0;
+  ypos       =   fClength[5][2]/2.0;
+  zpos       =  -fgkSheight/2.0 + 2.35;
+  gMC->Gspos("USD8",1,"UTI1", xpos, ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USD8",2,"UTI1", xpos,-ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USD8",3,"UTI2", xpos, ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USD8",4,"UTI2", xpos,-ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USD8",5,"UTI3", xpos, ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USD8",6,"UTI3", xpos,-ypos, zpos,        0,"ONLY");
+  // Lower bar (aluminum)
+  parBOX[0] = 82.60/2.0;
+  parBOX[1] =  1.20/2.0;
+  parBOX[2] =  1.40/2.0;
+  gMC->Gsvolu("USD9","BOX ",idtmed[1301-1],parBOX,kNparBOX);
+  xpos       =   0.0;
+  ypos       =   fClength[5][2]/2.0;
+  zpos       =  -fgkSheight/2.0 + fgkSMpltT + 1.40/2.0;
+  gMC->Gspos("USD9",1,"UTI1", xpos, ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USD9",2,"UTI1", xpos,-ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USD9",3,"UTI2", xpos, ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USD9",4,"UTI2", xpos,-ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USD9",5,"UTI3", xpos, ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USD9",6,"UTI3", xpos,-ypos, zpos,        0,"ONLY");
+  // Front sheet (aluminum)
+  parTRP[ 0] =   0.10/2.0;
+  parTRP[ 1] =   0.0;
+  parTRP[ 2] =   0.0;
+  parTRP[ 3] =  74.50/2.0;
+  parTRP[ 4] =  31.70/2.0;
+  parTRP[ 5] =  44.00/2.0;
+  parTRP[ 6] =  -5.0;
+  parTRP[ 7] =  74.50/2.0;
+  parTRP[ 8] =  31.70/2.0;
+  parTRP[ 9] =  44.00/2.0;
+  parTRP[10] =  -5.0;
+  gMC->Gsvolu("USDF","TRAP",idtmed[1302-1],parTRP,kNparTRP);
+  xpos       = -32.0;
+  ypos       =   fClength[5][2]/2.0 + 1.20/2.0 + 0.10/2.0;
+  zpos       =   0.0;
+  gMC->Gspos("USDF",1,"UTI1", xpos, ypos, zpos,matrix[2],"ONLY");
+  gMC->Gspos("USDF",2,"UTI1", xpos,-ypos, zpos,matrix[2],"ONLY");
+  gMC->Gspos("USDF",3,"UTI2", xpos, ypos, zpos,matrix[2],"ONLY");
+  gMC->Gspos("USDF",4,"UTI2", xpos,-ypos, zpos,matrix[2],"ONLY");
+  gMC->Gspos("USDF",5,"UTI3", xpos, ypos, zpos,matrix[2],"ONLY");
+  gMC->Gspos("USDF",6,"UTI3", xpos,-ypos, zpos,matrix[2],"ONLY");
+
+  //
+  // The flat frame in front of the chambers
+  //
+
+  // The envelope volume (aluminum)
+  parTRD[0]  =  90.00/2.0;
+  parTRD[1]  = 114.00/2.0;
+  parTRD[2]  =   1.50/2.0;
+  parTRD[3]  =  70.30/2.0;
+  gMC->Gsvolu("USCB","TRD1",idtmed[1301-1],parTRD,kNparTRD);
+  // Empty spaces (air)
+  parTRD[0]  =  87.00/2.0;
+  parTRD[1]  =  10.00/2.0;
+  parTRD[2]  =   1.50/2.0;
+  parTRD[3]  =  26.35/2.0;
+  gMC->Gsvolu("USC1","TRD1",idtmed[1302-1],parTRD,kNparTRD);
+  xpos       =  0.0;
+  ypos       =  0.0;
+  zpos       = 26.35/2.0 - 70.3/2.0;
+  gMC->Gspos("USC1",1,"USCB",xpos,ypos,zpos,0,"ONLY");
+  // Empty spaces (air)
+  parTRD[0]  =  10.00/2.0;
+  parTRD[1]  = 111.00/2.0;
+  parTRD[2]  =   1.50/2.0;
+  parTRD[3]  =  35.05/2.0;
+  gMC->Gsvolu("USC2","TRD1",idtmed[1302-1],parTRD,kNparTRD);
+  xpos       =  0.0;
+  ypos       =  0.0;
+  zpos       = 70.3/2.0 - 35.05/2.0;
+  gMC->Gspos("USC2",1,"USCB",xpos,ypos,zpos,0,"ONLY");
+  // Empty spaces (air)
+  parTRP[ 0] =   1.50/2.0;
+  parTRP[ 1] =   0.0;
+  parTRP[ 2] =   0.0;
+  parTRP[ 3] =  37.60/2.0;
+  parTRP[ 4] =  63.90/2.0;
+  parTRP[ 5] =   8.86/2.0;
+  parTRP[ 6] =  16.0;
+  parTRP[ 7] =  37.60/2.0;
+  parTRP[ 8] =  63.90/2.0;
+  parTRP[ 9] =   8.86/2.0;
+  parTRP[10] =  16.0;
+  gMC->Gsvolu("USC3","TRAP",idtmed[1302-1],parTRP,kNparTRP);
+  xpos       = -30.5;
+  ypos       =   0.0;
+  zpos       =  -2.0;
+  gMC->Gspos("USC3",1,"USCB", xpos, ypos, zpos,matrix[4],"ONLY");
+  gMC->Gspos("USC3",2,"USCB",-xpos, ypos, zpos,matrix[5],"ONLY");
+  xpos       =   0.0;
+  ypos       =   fClength[5][2]/2.0 + fClength[5][1] + fClength[5][0];
+  zpos       =   0.0;
+  gMC->Gspos("USCB",1,"UTI1", xpos, ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USCB",2,"UTI1", xpos,-ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USCB",3,"UTI2", xpos, ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USCB",4,"UTI2", xpos,-ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USCB",5,"UTI3", xpos, ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USCB",6,"UTI3", xpos,-ypos, zpos,        0,"ONLY");
+  // Upper bar (aluminum)
+  parBOX[0] = 95.00/2.0;
+  parBOX[1] =  1.50/2.0;
+  parBOX[2] =  3.00/2.0;
+  gMC->Gsvolu("USC4","BOX ",idtmed[1301-1],parBOX,kNparBOX);
+  xpos       =   0.0;
+  ypos       =   fClength[5][2]/2.0 + fClength[5][1] + fClength[5][0];
+  zpos       =   fgkSheight/2.0 - fgkSMpltT - 3.00/2.0;
+  gMC->Gspos("USC4",1,"UTI1", xpos, ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USC4",2,"UTI1", xpos,-ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USC4",3,"UTI2", xpos, ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USC4",4,"UTI2", xpos,-ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USC4",5,"UTI3", xpos, ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USC4",6,"UTI3", xpos,-ypos, zpos,        0,"ONLY");
+  // Lower bar (aluminum)
+  parBOX[0] = 90.22/2.0;
+  parBOX[1] =  1.50/2.0;
+  parBOX[2] =  2.20/2.0;
+  gMC->Gsvolu("USC5","BOX ",idtmed[1301-1],parBOX,kNparBOX);
+  xpos       =   0.0;
+  ypos       =   fClength[5][2]/2.0 + fClength[5][1] + fClength[5][0];
+  zpos       =  -fgkSheight/2.0 + 2.70;
+  gMC->Gspos("USC5",1,"UTI1", xpos, ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USC5",2,"UTI1", xpos,-ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USC5",3,"UTI2", xpos, ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USC5",4,"UTI2", xpos,-ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USC5",5,"UTI3", xpos, ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USC5",6,"UTI3", xpos,-ypos, zpos,        0,"ONLY");
+  // Lower bar (aluminum)
+  parBOX[0] = 82.60/2.0;
+  parBOX[1] =  1.50/2.0;
+  parBOX[2] =  1.60/2.0;
+  gMC->Gsvolu("USC6","BOX ",idtmed[1301-1],parBOX,kNparBOX);
+  xpos       =   0.0;
+  ypos       =   fClength[5][2]/2.0 + fClength[5][1] + fClength[5][0];
+  zpos       =  -fgkSheight/2.0 + fgkSMpltT + 1.60/2.0;
+  gMC->Gspos("USC6",1,"UTI1", xpos, ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USC6",2,"UTI1", xpos,-ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USC6",3,"UTI2", xpos, ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USC6",4,"UTI2", xpos,-ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USC6",5,"UTI3", xpos, ypos, zpos,        0,"ONLY");
+  gMC->Gspos("USC6",6,"UTI3", xpos,-ypos, zpos,        0,"ONLY");
+
   //
   // The long corner ledges
   //
@@ -851,8 +1512,12 @@ void AliTRDgeometry::CreateFrame(Int_t *idtmed)
   ypos  =   0.0;
   zpos  =   fgkSheight/2.0 - fgkSMpltT - kSCLposzUb; 
   gMC->Gspos("USL2",1,"UTI1", xpos,ypos,zpos,        0,"ONLY");
+  gMC->Gspos("USL2",3,"UTI2", xpos,ypos,zpos,        0,"ONLY");
+  gMC->Gspos("USL2",5,"UTI3", xpos,ypos,zpos,        0,"ONLY");
   xpos  = -xpos;
   gMC->Gspos("USL2",2,"UTI1", xpos,ypos,zpos,        0,"ONLY");
+  gMC->Gspos("USL2",4,"UTI2", xpos,ypos,zpos,        0,"ONLY");
+  gMC->Gspos("USL2",6,"UTI3", xpos,ypos,zpos,        0,"ONLY");
 
   // Lower ledges 
   // Thickness of the corner ledges
@@ -862,7 +1527,7 @@ void AliTRDgeometry::CreateFrame(Int_t *idtmed)
   const Float_t kSCLwidLa  =  8.5;
   const Float_t kSCLwidLb  =  3.3;
   // Position of the corner ledges
-  const Float_t kSCLposxLa =  0.0;
+  const Float_t kSCLposxLa =  0.1;
   const Float_t kSCLposxLb =  2.6;
   const Float_t kSCLposzLa = -4.25;
   const Float_t kSCLposzLb = -0.5;
@@ -884,8 +1549,12 @@ void AliTRDgeometry::CreateFrame(Int_t *idtmed)
   ypos  =   0.0;
   zpos  = - fgkSheight/2.0 + fgkSMpltT - kSCLposzLa;
   gMC->Gspos("USL3",1,"UTI1", xpos,ypos,zpos,matrix[2],"ONLY");
+  gMC->Gspos("USL3",3,"UTI2", xpos,ypos,zpos,matrix[2],"ONLY");
+  gMC->Gspos("USL3",5,"UTI3", xpos,ypos,zpos,matrix[2],"ONLY");
   xpos  = -xpos;
   gMC->Gspos("USL3",2,"UTI1", xpos,ypos,zpos,matrix[3],"ONLY");
+  gMC->Gspos("USL3",4,"UTI2", xpos,ypos,zpos,matrix[3],"ONLY");
+  gMC->Gspos("USL3",6,"UTI3", xpos,ypos,zpos,matrix[3],"ONLY");
   // Horizontal
   parSCL[0]  = kSCLwidLb /2.0;
   parSCL[1]  = fgkSlength/2.0;
@@ -895,8 +1564,65 @@ void AliTRDgeometry::CreateFrame(Int_t *idtmed)
   ypos  =   0.0;
   zpos  = - fgkSheight/2.0 + fgkSMpltT - kSCLposzLb;
   gMC->Gspos("USL4",1,"UTI1", xpos,ypos,zpos,        0,"ONLY");
+  gMC->Gspos("USL4",3,"UTI2", xpos,ypos,zpos,        0,"ONLY");
+  gMC->Gspos("USL4",5,"UTI3", xpos,ypos,zpos,        0,"ONLY");
   xpos  = -xpos;
   gMC->Gspos("USL4",2,"UTI1", xpos,ypos,zpos,        0,"ONLY");
+  gMC->Gspos("USL4",4,"UTI2", xpos,ypos,zpos,        0,"ONLY");
+  gMC->Gspos("USL4",6,"UTI3", xpos,ypos,zpos,        0,"ONLY");
+
+  //
+  // Aluminum plates in the front part of the super modules
+  //
+
+  const Int_t kNparTrd = 4;
+  Float_t parTrd[kNparTrd];
+  parTrd[0] = fgkSwidth1/2.0 - 2.5;
+  parTrd[1] = fgkSwidth2/2.0 - 2.5;
+  parTrd[2] = fgkSMpltT /2.0;
+  parTrd[3] = fgkSheight/2.0 - 1.0;
+  gMC->Gsvolu("UTA1","TRD1",idtmed[1301-1],parTrd,kNparTrd);
+  xpos      =  0.0;
+  ypos      =  fgkSMpltT/2.0 - fgkFlength/2.0;
+  zpos      = -0.5;
+  gMC->Gspos("UTA1",1,"UTF1",xpos, ypos,zpos,        0,"ONLY");
+  gMC->Gspos("UTA1",2,"UTF2",xpos,-ypos,zpos,        0,"ONLY");
+
+  const Int_t kNparPlt = 3;
+  Float_t parPlt[kNparPlt];
+  parPlt[0] =  0.0;
+  parPlt[1] =  0.0;
+  parPlt[2] =  0.0;
+  gMC->Gsvolu("UTA2","BOX ",idtmed[1301-1],parPlt,0);
+  xpos      =  0.0;
+  ypos      =  0.0;
+  zpos      =  fgkSheight/2.0 - fgkSMpltT/2.0;
+  parPlt[0] = fgkSwidth2/2.0;
+  parPlt[1] = fgkFlength/2.0;
+  parPlt[2] = fgkSMpltT /2.0;
+  gMC->Gsposp("UTA2",1,"UTF2",xpos,ypos,zpos
+                    ,        0,"ONLY",parPlt,kNparPlt);
+  xpos      = (fgkSwidth1 + fgkSwidth2)/4.0;
+  ypos      =  0.0;
+  zpos      =  0.0;
+  parPlt[0] = fgkSMpltT /2.0;
+  parPlt[1] = fgkFlength/2.0;
+  parPlt[2] = fgkSheight/2.0;
+  gMC->Gsposp("UTA2",2,"UTF2", xpos,ypos,zpos
+                    ,matrix[0],"ONLY",parPlt,kNparPlt);
+  gMC->Gsposp("UTA2",3,"UTF2",-xpos,ypos,zpos
+                    ,matrix[1],"ONLY",parPlt,kNparPlt);
+
+  // Additional aluminum bar
+  parBOX[0] = 80.0/2.0;
+  parBOX[1] =  1.0/2.0;
+  parBOX[2] = 10.0/2.0;
+  gMC->Gsvolu("UTA3","BOX ",idtmed[1301-1],parBOX,kNparBOX);
+  xpos      =  0.0;
+  ypos      =  1.0/2.0 + fgkSMpltT - fgkFlength/2.0;
+  zpos      =  fgkSheight/2.0 - 1.5 - 10.0/2.0;
+  gMC->Gspos("UTA3",1,"UTF1", xpos, ypos, zpos,        0,"ONLY");
+  gMC->Gspos("UTA3",2,"UTF2", xpos,-ypos, zpos,        0,"ONLY");
 
 }
 
@@ -908,14 +1634,15 @@ void AliTRDgeometry::CreateServices(Int_t *idtmed)
   //
   // Names of the TRD services volumina
   //
-  //        UTCL    Cooling arterias (Al)
-  //        UTCW    Cooling arterias (Water)
+  //        UTC1    Cooling arterias (Al)
+  //        UTC2    Cooling arterias (Water)
   //        UUxx    Volumes for the services at the chambers (Air)
-  //        UTPW    Power bars       (Cu)
+  //        UTP1    Power bars       (Cu)
   //        UTCP    Cooling pipes    (Fe)
   //        UTCH    Cooling pipes    (Water)
   //        UTPL    Power lines      (Cu)
   //        UMCM    Readout MCMs     (G10/Cu/Si)
+  //        UTGD    Gas distribution box (V2A)
   //
 
   Int_t   iplan = 0;
@@ -927,19 +1654,22 @@ void AliTRDgeometry::CreateServices(Int_t *idtmed)
 
   Char_t  cTagV[5];
 
+  const Int_t kNparBox  = 3;
+  Float_t parBox[kNparBox];
+
+  const Int_t kNparTube = 3;
+  Float_t parTube[kNparTube];
+
   // The rotation matrices
-  const Int_t kNmatrix = 4;
+  const Int_t kNmatrix = 7;
   Int_t   matrix[kNmatrix];
   gMC->Matrix(matrix[0], 100.0,   0.0,  90.0,  90.0,  10.0,   0.0);
   gMC->Matrix(matrix[1],  80.0,   0.0,  90.0,  90.0,  10.0, 180.0);
   gMC->Matrix(matrix[2],   0.0,   0.0,  90.0,  90.0,  90.0,   0.0);
   gMC->Matrix(matrix[3], 180.0,   0.0,  90.0,  90.0,  90.0, 180.0);
-
-  AliTRDCommonParam *commonParam = AliTRDCommonParam::Instance();
-  if (!commonParam) {
-    AliError("Could not get common parameters\n");
-    return;
-  }
+  gMC->Matrix(matrix[4],  90.0,   0.0,   0.0,   0.0,  90.0,  90.0);
+  gMC->Matrix(matrix[5], 100.0,   0.0,  90.0, 270.0,  10.0,   0.0);
+  gMC->Matrix(matrix[6],  80.0,   0.0,  90.0, 270.0,  10.0, 180.0);
     
   //
   // The cooling arterias
@@ -956,37 +1686,100 @@ void AliTRDgeometry::CreateServices(Int_t *idtmed)
   const Float_t kCOLthk  =  0.1;
   const Int_t   kNparCOL =  3;
   Float_t parCOL[kNparCOL];
-  parCOL[0]  = kCOLwid   /2.0;
-  parCOL[1]  = fgkSlength/2.0;
-  parCOL[2]  = kCOLhgt   /2.0;
-  gMC->Gsvolu("UTCL","BOX ",idtmed[1308-1],parCOL,kNparCOL);
-  parCOL[0] -= kCOLthk;
-  parCOL[1]  = fgkSlength/2.0;
-  parCOL[2] -= kCOLthk;
-  gMC->Gsvolu("UTCW","BOX ",idtmed[1314-1],parCOL,kNparCOL);
+  parCOL[0] = 0.0;
+  parCOL[1] = 0.0;
+  parCOL[2] = 0.0;
+  gMC->Gsvolu("UTC1","BOX ",idtmed[1308-1],parCOL,0);
+  gMC->Gsvolu("UTC3","BOX ",idtmed[1308-1],parCOL,0);
+  parCOL[0] =  kCOLwid/2.0 - kCOLthk;
+  parCOL[1] = -1.0;
+  parCOL[2] =  kCOLhgt/2.0 - kCOLthk;
+  gMC->Gsvolu("UTC2","BOX ",idtmed[1314-1],parCOL,kNparCOL);
+  gMC->Gsvolu("UTC4","BOX ",idtmed[1314-1],parCOL,kNparCOL);
 
   xpos  = 0.0;
   ypos  = 0.0;
   zpos  = 0.0;
-  gMC->Gspos("UTCW",1,"UTCL", xpos,ypos,zpos,0,"ONLY");
+  gMC->Gspos("UTC2",1,"UTC1", xpos,ypos,zpos,0,"ONLY");
+  gMC->Gspos("UTC4",1,"UTC3", xpos,ypos,zpos,0,"ONLY");
 
   for (iplan = 1; iplan < kNplan; iplan++) { 
 
-    xpos  = fCwidth[iplan]/2.0 + kCOLwid/2.0 + kCOLposx;
-    ypos  = 0.0;
-    zpos  = fgkVrocsm + fgkSMpltT + kCOLhgt/2.0 - fgkSheight/2.0 + kCOLposz 
-          + iplan * (fgkCH + fgkVspace);
-    gMC->Gspos("UTCL",iplan       ,"UTI1", xpos,ypos,zpos,matrix[0],"ONLY");
-    gMC->Gspos("UTCL",iplan+kNplan,"UTI1",-xpos,ypos,zpos,matrix[1],"ONLY");
+    // Along the chambers
+    xpos      = fCwidth[iplan]/2.0 + kCOLwid/2.0 + kCOLposx;
+    ypos      = 0.0;
+    zpos      = fgkVrocsm + fgkSMpltT + kCOLhgt/2.0 - fgkSheight/2.0 + kCOLposz 
+              + iplan * (fgkCH + fgkVspace);
+    parCOL[0] = kCOLwid   /2.0;
+    parCOL[1] = fgkSlength/2.0;
+    parCOL[2] = kCOLhgt   /2.0;
+    gMC->Gsposp("UTC1",iplan         ,"UTI1", xpos,ypos,zpos
+                      ,matrix[0],"ONLY",parCOL,kNparCOL);
+    gMC->Gsposp("UTC1",iplan+  kNplan,"UTI1",-xpos,ypos,zpos
+                      ,matrix[1],"ONLY",parCOL,kNparCOL);
+    gMC->Gsposp("UTC1",iplan+6*kNplan,"UTI2", xpos,ypos,zpos
+                      ,matrix[0],"ONLY",parCOL,kNparCOL);
+    gMC->Gsposp("UTC1",iplan+7*kNplan,"UTI2",-xpos,ypos,zpos
+                      ,matrix[1],"ONLY",parCOL,kNparCOL);
+    gMC->Gsposp("UTC1",iplan+8*kNplan ,"UTI3", xpos,ypos,zpos
+                      ,matrix[0],"ONLY",parCOL,kNparCOL);
+    gMC->Gsposp("UTC1",iplan+9*kNplan,"UTI3",-xpos,ypos,zpos
+                      ,matrix[1],"ONLY",parCOL,kNparCOL);
+
+    // Front of supermodules
+    xpos      = fCwidth[iplan]/2.0 + kCOLwid/2.0 + kCOLposx;
+    ypos      = 0.0;
+    zpos      = fgkVrocsm + fgkSMpltT + kCOLhgt/2.0 - fgkSheight/2.0 + kCOLposz 
+              + iplan * (fgkCH + fgkVspace);
+    parCOL[0] = kCOLwid   /2.0;
+    parCOL[1] = fgkFlength/2.0;
+    parCOL[2] = kCOLhgt   /2.0;
+    gMC->Gsposp("UTC3",iplan+2*kNplan,"UTF1", xpos,ypos,zpos
+                      ,matrix[0],"ONLY",parCOL,kNparCOL);
+    gMC->Gsposp("UTC3",iplan+3*kNplan,"UTF1",-xpos,ypos,zpos
+                      ,matrix[1],"ONLY",parCOL,kNparCOL);
+    gMC->Gsposp("UTC3",iplan+4*kNplan,"UTF2", xpos,ypos,zpos
+                      ,matrix[0],"ONLY",parCOL,kNparCOL);
+    gMC->Gsposp("UTC3",iplan+5*kNplan,"UTF2",-xpos,ypos,zpos
+                      ,matrix[1],"ONLY",parCOL,kNparCOL);
 
   }
 
   // The upper most layer (reaching into TOF acceptance)
-  xpos  = fCwidth[5]/2.0 - kCOLhgt/2.0 - 1.3;
-  ypos  = 0.0;
-  zpos  = fgkSheight/2.0 - fgkSMpltT - 0.4 - kCOLwid/2.0; 
-  gMC->Gspos("UTCL",6       ,"UTI1", xpos,ypos,zpos,matrix[3],"ONLY");
-  gMC->Gspos("UTCL",6+kNplan,"UTI1",-xpos,ypos,zpos,matrix[3],"ONLY");
+  // Along the chambers
+  xpos      = fCwidth[5]/2.0 - kCOLhgt/2.0 - 1.3;
+  ypos      = 0.0;
+  zpos      = fgkSheight/2.0 - fgkSMpltT - 0.4 - kCOLwid/2.0; 
+  parCOL[0] = kCOLwid   /2.0;
+  parCOL[1] = fgkSlength/2.0;
+  parCOL[2] = kCOLhgt   /2.0;
+  gMC->Gsposp("UTC1",6         ,"UTI1", xpos,ypos,zpos
+                    ,matrix[3],"ONLY",parCOL,kNparCOL);
+  gMC->Gsposp("UTC1",6+  kNplan,"UTI1",-xpos,ypos,zpos
+                    ,matrix[3],"ONLY",parCOL,kNparCOL);
+  gMC->Gsposp("UTC1",6+6*kNplan,"UTI2", xpos,ypos,zpos
+                    ,matrix[3],"ONLY",parCOL,kNparCOL);
+  gMC->Gsposp("UTC1",6+7*kNplan,"UTI2",-xpos,ypos,zpos
+                    ,matrix[3],"ONLY",parCOL,kNparCOL);
+  gMC->Gsposp("UTC1",6+8*kNplan,"UTI3", xpos,ypos,zpos
+                    ,matrix[3],"ONLY",parCOL,kNparCOL);
+  gMC->Gsposp("UTC1",6+9*kNplan,"UTI3",-xpos,ypos,zpos
+                    ,matrix[3],"ONLY",parCOL,kNparCOL);
+  // Front of supermodules
+  xpos      = fCwidth[5]/2.0 - kCOLhgt/2.0 - 1.3;
+  ypos      = 0.0;
+  zpos      = fgkSheight/2.0 - fgkSMpltT - 0.4 - kCOLwid/2.0; 
+  parCOL[0] = kCOLwid   /2.0;
+  parCOL[1] = fgkFlength/2.0;
+  parCOL[2] = kCOLhgt   /2.0;
+  gMC->Gsposp("UTC3",6+2*kNplan,"UTF1", xpos,ypos,zpos
+                    ,matrix[3],"ONLY",parCOL,kNparCOL);
+  gMC->Gsposp("UTC3",6+3*kNplan,"UTF1",-xpos,ypos,zpos
+                    ,matrix[3],"ONLY",parCOL,kNparCOL);
+  gMC->Gsposp("UTC3",6+4*kNplan,"UTF2", xpos,ypos,zpos
+                    ,matrix[3],"ONLY",parCOL,kNparCOL);
+  gMC->Gsposp("UTC3",6+5*kNplan,"UTF2",-xpos,ypos,zpos
+                    ,matrix[3],"ONLY",parCOL,kNparCOL);
 
   //
   // The power bars
@@ -998,28 +1791,115 @@ void AliTRDgeometry::CreateServices(Int_t *idtmed)
   const Float_t kPWRposz =  1.9;
   const Int_t   kNparPWR =  3;
   Float_t parPWR[kNparPWR];
-  parPWR[0] = kPWRwid   /2.0;
-  parPWR[1] = fgkSlength/2.0;
-  parPWR[2] = kPWRhgt   /2.0;
-  gMC->Gsvolu("UTPW","BOX ",idtmed[1325-1],parPWR,kNparPWR);
+  parPWR[0] = 0.0;
+  parPWR[1] = 0.0;
+  parPWR[2] = 0.0;
+  gMC->Gsvolu("UTP1","BOX ",idtmed[1325-1],parPWR,0);
+  gMC->Gsvolu("UTP3","BOX ",idtmed[1325-1],parPWR,0);
   
   for (iplan = 1; iplan < kNplan; iplan++) { 
-    
-    xpos  = fCwidth[iplan]/2.0 + kPWRwid/2.0 + kPWRposx;
-    ypos  = 0.0;
-    zpos  = fgkVrocsm + fgkSMpltT + kPWRhgt/2.0 - fgkSheight/2.0 + kPWRposz 
-          + iplan * (fgkCH + fgkVspace);
-    gMC->Gspos("UTPW",iplan       ,"UTI1", xpos,ypos,zpos,matrix[0],"ONLY");
-    gMC->Gspos("UTPW",iplan+kNplan,"UTI1",-xpos,ypos,zpos,matrix[1],"ONLY");
+
+    // Along the chambers
+    xpos      = fCwidth[iplan]/2.0 + kPWRwid/2.0 + kPWRposx;
+    ypos      = 0.0;
+    zpos      = fgkVrocsm + fgkSMpltT + kPWRhgt/2.0 - fgkSheight/2.0 + kPWRposz 
+              + iplan * (fgkCH + fgkVspace);
+    parPWR[0] = kPWRwid   /2.0;
+    parPWR[1] = fgkSlength/2.0;
+    parPWR[2] = kPWRhgt   /2.0;
+    gMC->Gsposp("UTP1",iplan         ,"UTI1", xpos,ypos,zpos
+                      ,matrix[0],"ONLY",parPWR,kNparPWR);
+    gMC->Gsposp("UTP1",iplan+  kNplan,"UTI1",-xpos,ypos,zpos
+                      ,matrix[1],"ONLY",parPWR,kNparPWR);
+    gMC->Gsposp("UTP1",iplan+6*kNplan,"UTI2", xpos,ypos,zpos
+                      ,matrix[0],"ONLY",parPWR,kNparPWR);
+    gMC->Gsposp("UTP1",iplan+7*kNplan,"UTI2",-xpos,ypos,zpos
+                      ,matrix[1],"ONLY",parPWR,kNparPWR);
+    gMC->Gsposp("UTP1",iplan+8*kNplan,"UTI3", xpos,ypos,zpos
+                      ,matrix[0],"ONLY",parPWR,kNparPWR);
+    gMC->Gsposp("UTP1",iplan+9*kNplan,"UTI3",-xpos,ypos,zpos
+                      ,matrix[1],"ONLY",parPWR,kNparPWR);
+
+    // Front of supermodule
+    xpos      = fCwidth[iplan]/2.0 + kPWRwid/2.0 + kPWRposx;
+    ypos      = 0.0;
+    zpos      = fgkVrocsm + fgkSMpltT + kPWRhgt/2.0 - fgkSheight/2.0 + kPWRposz 
+              + iplan * (fgkCH + fgkVspace);
+    parPWR[0] = kPWRwid   /2.0;
+    parPWR[1] = fgkFlength/2.0;
+    parPWR[2] = kPWRhgt   /2.0;
+    gMC->Gsposp("UTP3",iplan+2*kNplan,"UTF1", xpos,ypos,zpos
+                      ,matrix[0],"ONLY",parPWR,kNparPWR);
+    gMC->Gsposp("UTP3",iplan+3*kNplan,"UTF1",-xpos,ypos,zpos
+                      ,matrix[1],"ONLY",parPWR,kNparPWR);
+    gMC->Gsposp("UTP3",iplan+4*kNplan,"UTF2", xpos,ypos,zpos
+                      ,matrix[0],"ONLY",parPWR,kNparPWR);
+    gMC->Gsposp("UTP3",iplan+5*kNplan,"UTF2",-xpos,ypos,zpos
+                      ,matrix[1],"ONLY",parPWR,kNparPWR);
 
   }
 
   // The upper most layer (reaching into TOF acceptance)
-  xpos  = fCwidth[5]/2.0 + kPWRhgt/2.0 - 1.3;
+  // Along the chambers
+  xpos      = fCwidth[5]/2.0 + kPWRhgt/2.0 - 1.3;
+  ypos      = 0.0;
+  zpos      = fgkSheight/2.0 - fgkSMpltT - 0.6 - kPWRwid/2.0; 
+  parPWR[0] = kPWRwid   /2.0;
+  parPWR[1] = fgkSlength/2.0;
+  parPWR[2] = kPWRhgt   /2.0;
+  gMC->Gsposp("UTP1",6         ,"UTI1", xpos,ypos,zpos
+                    ,matrix[3],"ONLY",parPWR,kNparPWR);
+  gMC->Gsposp("UTP1",6+  kNplan,"UTI1",-xpos,ypos,zpos
+                    ,matrix[3],"ONLY",parPWR,kNparPWR);
+  gMC->Gsposp("UTP1",6+6*kNplan,"UTI2", xpos,ypos,zpos
+                    ,matrix[3],"ONLY",parPWR,kNparPWR);
+  gMC->Gsposp("UTP1",6+7*kNplan,"UTI2",-xpos,ypos,zpos
+                    ,matrix[3],"ONLY",parPWR,kNparPWR);
+  gMC->Gsposp("UTP1",6+8*kNplan,"UTI3", xpos,ypos,zpos
+                    ,matrix[3],"ONLY",parPWR,kNparPWR);
+  gMC->Gsposp("UTP1",6+9*kNplan,"UTI3",-xpos,ypos,zpos
+                    ,matrix[3],"ONLY",parPWR,kNparPWR);
+  // Front of supermodules
+  xpos      = fCwidth[5]/2.0 + kPWRhgt/2.0 - 1.3;
+  ypos      = 0.0;
+  zpos      = fgkSheight/2.0 - fgkSMpltT - 0.6 - kPWRwid/2.0; 
+  parPWR[0] = kPWRwid   /2.0;
+  parPWR[1] = fgkFlength/2.0;
+  parPWR[2] = kPWRhgt   /2.0;
+  gMC->Gsposp("UTP3",6+2*kNplan,"UTF1", xpos,ypos,zpos
+                    ,matrix[3],"ONLY",parPWR,kNparPWR);
+  gMC->Gsposp("UTP3",6+3*kNplan,"UTF1",-xpos,ypos,zpos
+                    ,matrix[3],"ONLY",parPWR,kNparPWR);
+  gMC->Gsposp("UTP3",6+4*kNplan,"UTF2", xpos,ypos,zpos
+                    ,matrix[3],"ONLY",parPWR,kNparPWR);
+  gMC->Gsposp("UTP3",6+5*kNplan,"UTF2",-xpos,ypos,zpos
+                    ,matrix[3],"ONLY",parPWR,kNparPWR);
+
+  //
+  // The gas tubes connecting the chambers in the super modules with holes
+  // Material: Stainless steel
+  //
+
+  parTube[0] = 0.0;
+  parTube[1] = 2.2/2.0;
+  parTube[2] = fClength[5][2]/2.0 - fgkHspace/2.0;
+  gMC->Gsvolu("UTG1","TUBE",idtmed[1308-1],parTube,kNparTube);
+  parTube[0] = 0.0;
+  parTube[1] = 2.1/2.0;
+  parTube[2] = fClength[5][2]/2.0 - fgkHspace/2.0;
+  gMC->Gsvolu("UTG2","TUBE",idtmed[1309-1],parTube,kNparTube);
+  xpos  = 0.0;
   ypos  = 0.0;
-  zpos  = fgkSheight/2.0 - fgkSMpltT - 0.6 - kPWRwid/2.0; 
-  gMC->Gspos("UTPW",6       ,"UTI1", xpos,ypos,zpos,matrix[3],"ONLY");
-  gMC->Gspos("UTPW",6+kNplan,"UTI1",-xpos,ypos,zpos,matrix[3],"ONLY");
+  zpos  = 0.0;
+  gMC->Gspos("UTG2",1,"UTG1",xpos,ypos,zpos,0,"ONLY");
+  for (iplan = 0; iplan < kNplan; iplan++) { 
+    xpos      = fCwidth[iplan]/2.0 + kCOLwid/2.0 - 1.5;
+    ypos      = 0.0;
+    zpos      = fgkVrocsm + fgkSMpltT + kCOLhgt/2.0 - fgkSheight/2.0 + 5.0 
+              + iplan * (fgkCH + fgkVspace);
+    gMC->Gspos("UTG1",1+iplan,"UTI3", xpos, ypos, zpos,matrix[4],"ONLY");
+    gMC->Gspos("UTG1",7+iplan,"UTI3",-xpos, ypos, zpos,matrix[4],"ONLY");
+  }
 
   //
   // The volumes for the services at the chambers
@@ -1043,12 +1923,12 @@ void AliTRDgeometry::CreateServices(Int_t *idtmed)
       gMC->Gsvolu(cTagV,"BOX",idtmed[1302-1],parServ,kNparServ);
 
       xpos  = 0.0;
-      ypos  = - fClength[iplan][0] - fClength[iplan][1] - fClength[iplan][2]/2.0;
+      ypos  = fClength[iplan][0] + fClength[iplan][1] + fClength[iplan][2]/2.0;
       for (Int_t ic = 0; ic < icham; ic++) {
-        ypos += fClength[iplan][ic];        
+        ypos -= fClength[iplan][ic];
       }
-      ypos += fClength[iplan][icham]/2.0;
-      zpos  = fgkVrocsm + fgkSMpltT + fgkCH + fgkVspace/2.0 - fgkSheight/2.0 
+      ypos -= fClength[iplan][icham]/2.0;
+      zpos  = fgkVrocsm + fgkSMpltT + fgkCH + fgkVspace/2.0 - fgkSheight/2.0
             + iplan * (fgkCH + fgkVspace);
       zpos -= 0.742/2.0;
       fChamberUUorig[iDet][0] = xpos;
@@ -1062,17 +1942,15 @@ void AliTRDgeometry::CreateServices(Int_t *idtmed)
   // The cooling pipes inside the service volumes
   //
 
-  const Int_t kNparTube = 3;
-  Float_t parTube[kNparTube];
   // The cooling pipes
-  parTube[0] = 0.0;
-  parTube[1] = 0.0;
-  parTube[2] = 0.0;
+  parTube[0] =  0.0;
+  parTube[1] =  0.0;
+  parTube[2] =  0.0;
   gMC->Gsvolu("UTCP","TUBE",idtmed[1324-1],parTube,0);
   // The cooling water
   parTube[0] =  0.0;
   parTube[1] =  0.2/2.0;
-  parTube[2] = -1.;
+  parTube[2] = -1.0;
   gMC->Gsvolu("UTCH","TUBE",idtmed[1314-1],parTube,kNparTube);
   // Water inside the cooling pipe
   xpos = 0.0;
@@ -1081,13 +1959,11 @@ void AliTRDgeometry::CreateServices(Int_t *idtmed)
   gMC->Gspos("UTCH",1,"UTCP",xpos,ypos,zpos,0,"ONLY");
 
   // Position the cooling pipes in the mother volume
-  const Int_t kNpar = 3;
-  Float_t par[kNpar];
   for (icham = 0; icham < kNcham;   icham++) {
     for (iplan = 0; iplan < kNplan; iplan++) {
       Int_t   iDet    = GetDetectorSec(iplan,icham);
       Int_t   iCopy   = GetDetector(iplan,icham,0) * 100;
-      Int_t   nMCMrow = commonParam->GetRowMax(iplan,icham,0);
+      Int_t   nMCMrow = GetRowMax(iplan,icham,0);
       Float_t ySize   = (GetChamberLength(iplan,icham) - 2.0*fgkRpadW) 
                       / ((Float_t) nMCMrow);
       sprintf(cTagV,"UU%02d",iDet);
@@ -1096,11 +1972,12 @@ void AliTRDgeometry::CreateServices(Int_t *idtmed)
         ypos   = (0.5 + iMCMrow) * ySize - 1.9 
                - fClength[iplan][icham]/2.0 + fgkHspace/2.0;
         zpos   = 0.0 + 0.742/2.0;                 
-        par[0] = 0.0;
-        par[1] = 0.3/2.0; // Thickness of the cooling pipes
-        par[2] = fCwidth[iplan]/2.0;
+       // The cooling pipes
+        parTube[0] = 0.0;
+        parTube[1] = 0.3/2.0; // Thickness of the cooling pipes
+        parTube[2] = fCwidth[iplan]/2.0;
         gMC->Gsposp("UTCP",iCopy+iMCMrow,cTagV,xpos,ypos,zpos
-                          ,matrix[2],"ONLY",par,kNpar);
+                          ,matrix[2],"ONLY",parTube,kNparTube);
       }
     }
   }
@@ -1120,20 +1997,20 @@ void AliTRDgeometry::CreateServices(Int_t *idtmed)
     for (iplan = 0; iplan < kNplan; iplan++) {
       Int_t   iDet    = GetDetectorSec(iplan,icham);
       Int_t   iCopy   = GetDetector(iplan,icham,0) * 100;
-      Int_t   nMCMrow = commonParam->GetRowMax(iplan,icham,0);
+      Int_t   nMCMrow = GetRowMax(iplan,icham,0);
       Float_t ySize   = (GetChamberLength(iplan,icham) - 2.0*fgkRpadW) 
                       / ((Float_t) nMCMrow);
       sprintf(cTagV,"UU%02d",iDet);
       for (Int_t iMCMrow = 0; iMCMrow < nMCMrow; iMCMrow++) {
-        xpos   = 0.0;
-        ypos   = (0.5 + iMCMrow) * ySize - 1.0 
-               - fClength[iplan][icham]/2.0 + fgkHspace/2.0;
-        zpos   = -0.4 + 0.742/2.0;
-        par[0] = 0.0;
-        par[1] = 0.2/2.0; // Thickness of the power lines
-        par[2] = fCwidth[iplan]/2.0;
+        xpos       = 0.0;
+        ypos       = (0.5 + iMCMrow) * ySize - 1.0 
+                   - fClength[iplan][icham]/2.0 + fgkHspace/2.0;
+        zpos       = -0.4 + 0.742/2.0;
+        parTube[0] = 0.0;
+        parTube[1] = 0.2/2.0; // Thickness of the power lines
+        parTube[2] = fCwidth[iplan]/2.0;
         gMC->Gsposp("UTPL",iCopy+iMCMrow,cTagV,xpos,ypos,zpos
-                          ,matrix[2],"ONLY",par,kNpar);
+                          ,matrix[2],"ONLY",parTube,kNparTube);
       }
     }
   }
@@ -1145,11 +2022,11 @@ void AliTRDgeometry::CreateServices(Int_t *idtmed)
   const Float_t kMCMx    = 3.0;
   const Float_t kMCMy    = 3.0;
   const Float_t kMCMz    = 0.3;
-
+  
   const Float_t kMCMpcTh = 0.1;
-  const Float_t kMCMcuTh = 0.0215;
-  const Float_t kMCMsiTh = 0.003;
-  const Float_t kMCMcoTh = 0.1549;
+  const Float_t kMCMcuTh = 0.0025;
+  const Float_t kMCMsiTh = 0.03;
+  const Float_t kMCMcoTh = 0.04;
 
   // The mother volume for the MCMs (air)
   const Int_t kNparMCM = 3;
@@ -1197,7 +2074,7 @@ void AliTRDgeometry::CreateServices(Int_t *idtmed)
     for (iplan = 0; iplan < kNplan; iplan++) {
       Int_t   iDet    = GetDetectorSec(iplan,icham);
       Int_t   iCopy   = GetDetector(iplan,icham,0) * 1000;
-      Int_t   nMCMrow = commonParam->GetRowMax(iplan,icham,0);
+      Int_t   nMCMrow = GetRowMax(iplan,icham,0);
       Float_t ySize   = (GetChamberLength(iplan,icham) - 2.0*fgkRpadW) 
                       / ((Float_t) nMCMrow);
       Int_t   nMCMcol = 8;
@@ -1206,14 +2083,11 @@ void AliTRDgeometry::CreateServices(Int_t *idtmed)
       sprintf(cTagV,"UU%02d",iDet);
       for (Int_t iMCMrow = 0; iMCMrow < nMCMrow; iMCMrow++) {
         for (Int_t iMCMcol = 0; iMCMcol < nMCMcol; iMCMcol++) {
-          xpos   = (0.5 + iMCMcol) * xSize + 1.0 
-                 - fCwidth[iplan]/2.0;
-          ypos   = (0.5 + iMCMrow) * ySize + 1.0 
-                 - fClength[iplan][icham]/2.0 + fgkHspace/2.0;
-          zpos   = -0.4 + 0.742/2.0;
-          par[0] = 0.0;
-          par[1] = 0.2/2.0; // Thickness of the power lines
-          par[2] = fCwidth[iplan]/2.0;
+          xpos      = (0.5 + iMCMcol) * xSize + 1.0 
+                    - fCwidth[iplan]/2.0;
+          ypos      = (0.5 + iMCMrow) * ySize + 1.0 
+                    - fClength[iplan][icham]/2.0 + fgkHspace/2.0;
+          zpos      = -0.4 + 0.742/2.0;
           gMC->Gspos("UMCM",iCopy+iMCMrow*10+iMCMcol,cTagV
                            ,xpos,ypos,zpos,0,"ONLY");
        }
@@ -1222,6 +2096,247 @@ void AliTRDgeometry::CreateServices(Int_t *idtmed)
     }
   }
 
+  //
+  // Services in front of the super module
+  //
+
+  // Gas in-/outlet pipes (INOX)
+  parTube[0] = 0.0;
+  parTube[1] = 0.0;
+  parTube[2] = 0.0;
+  gMC->Gsvolu("UTG3","TUBE",idtmed[1308-1],parTube,0);
+  // The gas inside the in-/outlet pipes (Xe)
+  parTube[0] =  0.0;
+  parTube[1] =  1.2/2.0;
+  parTube[2] = -1.0;
+  gMC->Gsvolu("UTG4","TUBE",idtmed[1309-1],parTube,kNparTube);
+  xpos = 0.0;
+  ypos = 0.0;
+  zpos = 0.0;
+  gMC->Gspos("UTG4",1,"UTG3",xpos,ypos,zpos,0,"ONLY");
+  for (iplan = 0; iplan < kNplan-1; iplan++) { 
+    xpos       = 0.0;
+    ypos       = fClength[iplan][2]/2.0 
+               + fClength[iplan][1] 
+               + fClength[iplan][0];
+    zpos       = 9.0 - fgkSheight/2.0
+               + iplan * (fgkCH + fgkVspace);
+    parTube[0] = 0.0;
+    parTube[1] = 1.5/2.0;
+    parTube[2] = fCwidth[iplan]/2.0 - 2.5;
+    gMC->Gsposp("UTG3",iplan+1         ,"UTI1", xpos, ypos, zpos
+                      ,matrix[2],"ONLY",parTube,kNparTube);
+    gMC->Gsposp("UTG3",iplan+1+1*kNplan,"UTI1", xpos,-ypos, zpos
+                      ,matrix[2],"ONLY",parTube,kNparTube);
+    gMC->Gsposp("UTG3",iplan+1+2*kNplan,"UTI2", xpos, ypos, zpos
+                      ,matrix[2],"ONLY",parTube,kNparTube);
+    gMC->Gsposp("UTG3",iplan+1+3*kNplan,"UTI2", xpos,-ypos, zpos
+                      ,matrix[2],"ONLY",parTube,kNparTube);
+    gMC->Gsposp("UTG3",iplan+1+4*kNplan,"UTI3", xpos, ypos, zpos
+                      ,matrix[2],"ONLY",parTube,kNparTube);
+    gMC->Gsposp("UTG3",iplan+1+5*kNplan,"UTI3", xpos,-ypos, zpos
+                      ,matrix[2],"ONLY",parTube,kNparTube);
+  }
+
+  // Gas distribution box
+  parBox[0] = 14.50/2.0;
+  parBox[1] =  4.52/2.0;
+  parBox[2] =  5.00/2.0;
+  gMC->Gsvolu("UTGD","BOX ",idtmed[1308-1],parBox,kNparBox);
+  parBox[0] = 14.50/2.0;
+  parBox[1] =  4.00/2.0;
+  parBox[2] =  4.40/2.0;
+  gMC->Gsvolu("UTGI","BOX ",idtmed[1309-1],parBox,kNparBox);
+  parTube[0] = 0.0;
+  parTube[1] = 4.0/2.0;
+  parTube[2] = 8.0/2.0;
+  gMC->Gsvolu("UTGT","TUBE",idtmed[1308-1],parTube,kNparTube);
+  parTube[0] = 0.0;
+  parTube[1] = 3.4/2.0;
+  parTube[2] = 8.0/2.0;
+  gMC->Gsvolu("UTGG","TUBE",idtmed[1309-1],parTube,kNparTube);
+  xpos = 0.0;
+  ypos = 0.0;
+  zpos = 0.0;
+  gMC->Gspos("UTGI",1,"UTGD",xpos,ypos,zpos,        0,"ONLY");
+  gMC->Gspos("UTGG",1,"UTGT",xpos,ypos,zpos,        0,"ONLY");
+  xpos = 0.0;
+  ypos = 0.0;
+  zpos = 0.0;
+  gMC->Gspos("UTGD",1,"UTF1",xpos,ypos,zpos,        0,"ONLY");
+  xpos =  -3.0;
+  ypos =   0.0;
+  zpos =   6.5;
+  gMC->Gspos("UTGT",1,"UTF1",xpos,ypos,zpos,        0,"ONLY");
+  xpos = -11.25;
+  ypos =   0.0;
+  zpos =   0.5;
+  gMC->Gspos("UTGT",3,"UTF1",xpos,ypos,zpos,matrix[2],"ONLY");
+  xpos =  11.25;
+  ypos =   0.0;
+  zpos =   0.5;
+  gMC->Gspos("UTGT",5,"UTF1",xpos,ypos,zpos,matrix[2],"ONLY");
+
+  // Cooling manifolds
+  parBox[0]  =  5.0/2.0;
+  parBox[1]  = 23.0/2.0;
+  parBox[2]  = 70.0/2.0;
+  gMC->Gsvolu("UTCM","BOX ",idtmed[1302-1],parBox,kNparBox);
+  parBox[0]  =  5.0/2.0;
+  parBox[1]  =  5.0/2.0;
+  parBox[2]  = 70.0/2.0;
+  gMC->Gsvolu("UTCA","BOX ",idtmed[1308-1],parBox,kNparBox);
+  parBox[0]  =  5.0/2.0 - 0.3;
+  parBox[1]  =  5.0/2.0 - 0.3;
+  parBox[2]  = 70.0/2.0 - 0.3;
+  gMC->Gsvolu("UTCW","BOX ",idtmed[1314-1],parBox,kNparBox);
+  xpos       =  0.0;
+  ypos       =  0.0;
+  zpos       =  0.0;
+  gMC->Gspos("UTCW",1,"UTCA", xpos, ypos, zpos,        0,"ONLY");
+  xpos       =  0.0;
+  ypos       =  5.0/2.0 - 23.0/2.0;
+  zpos       =  0.0;
+  gMC->Gspos("UTCA",1,"UTCM", xpos, ypos, zpos,        0,"ONLY");
+  parTube[0] =  0.0;
+  parTube[1] =  3.0/2.0;
+  parTube[2] = 18.0/2.0;
+  gMC->Gsvolu("UTCO","TUBE",idtmed[1308-1],parTube,kNparTube);
+  parTube[0] =  0.0;
+  parTube[1] =  3.0/2.0 - 0.3;
+  parTube[2] = 18.0/2.0;
+  gMC->Gsvolu("UTCL","TUBE",idtmed[1314-1],parTube,kNparTube);
+  xpos       =  0.0;
+  ypos       =  0.0;
+  zpos       =  0.0;
+  gMC->Gspos("UTCL",1,"UTCO", xpos, ypos, zpos,        0,"ONLY");
+  xpos       =  0.0;
+  ypos       =  2.5;
+  zpos       = -70.0/2.0 + 7.0;
+  gMC->Gspos("UTCO",1,"UTCM", xpos, ypos, zpos,matrix[4],"ONLY");
+  zpos      +=  7.0;
+  gMC->Gspos("UTCO",2,"UTCM", xpos, ypos, zpos,matrix[4],"ONLY");
+  zpos      +=  7.0;
+  gMC->Gspos("UTCO",3,"UTCM", xpos, ypos, zpos,matrix[4],"ONLY");
+  zpos      +=  7.0;
+  gMC->Gspos("UTCO",4,"UTCM", xpos, ypos, zpos,matrix[4],"ONLY");
+  zpos      +=  7.0;
+  gMC->Gspos("UTCO",5,"UTCM", xpos, ypos, zpos,matrix[4],"ONLY");
+  zpos      +=  7.0;
+  gMC->Gspos("UTCO",6,"UTCM", xpos, ypos, zpos,matrix[4],"ONLY");
+  zpos      +=  7.0;
+  gMC->Gspos("UTCO",7,"UTCM", xpos, ypos, zpos,matrix[4],"ONLY");
+  zpos      +=  7.0;
+  gMC->Gspos("UTCO",8,"UTCM", xpos, ypos, zpos,matrix[4],"ONLY");
+
+  xpos = 40.0;
+  ypos =  fgkFlength/2.0 - 23.0/2.0;
+  zpos =  0.0;
+  gMC->Gspos("UTCM",1,"UTF1", xpos, ypos, zpos,matrix[0],"ONLY");
+  gMC->Gspos("UTCM",2,"UTF1",-xpos, ypos, zpos,matrix[1],"ONLY");
+  gMC->Gspos("UTCM",3,"UTF2", xpos,-ypos, zpos,matrix[5],"ONLY");
+  gMC->Gspos("UTCM",4,"UTF2",-xpos,-ypos, zpos,matrix[6],"ONLY");
+
+  // Power connection boards (Cu)
+  parBox[0] =  0.5/2.0;
+  parBox[1] = 15.0/2.0;
+  parBox[2] =  7.0/2.0;
+  gMC->Gsvolu("UTPC","BOX ",idtmed[1325-1],parBox,kNparBox);
+  for (iplan = 0; iplan < kNplan-1; iplan++) { 
+    xpos      = fCwidth[iplan]/2.0 + kPWRwid/2.0;
+    ypos      = 0.0;
+    zpos      = fgkVrocsm + fgkSMpltT + kPWRhgt/2.0 - fgkSheight/2.0 + kPWRposz 
+              + (iplan+1) * (fgkCH + fgkVspace);
+    gMC->Gspos("UTPC",iplan       ,"UTF1", xpos,ypos,zpos,matrix[0],"ONLY");
+    gMC->Gspos("UTPC",iplan+kNplan,"UTF1",-xpos,ypos,zpos,matrix[1],"ONLY");
+  }
+  xpos      = fCwidth[5]/2.0 + kPWRhgt/2.0 - 1.3;
+  ypos      = 0.0;
+  zpos      = fgkSheight/2.0 - fgkSMpltT - 2.0; 
+  gMC->Gspos("UTPC",5       ,"UTF1", xpos,ypos,zpos,matrix[3],"ONLY");
+  gMC->Gspos("UTPC",5+kNplan,"UTF1",-xpos,ypos,zpos,matrix[3],"ONLY");
+
+  // Power connection panel (Al)
+  parBox[0] = 60.0/2.0;
+  parBox[1] = 10.0/2.0;
+  parBox[2] =  3.0/2.0;
+  gMC->Gsvolu("UTPP","BOX ",idtmed[1301-1],parBox,kNparBox);
+  xpos      =  0.0;
+  ypos      =  0.0;
+  zpos      = 18.0;
+  gMC->Gspos("UTPP",1,"UTF1", xpos,ypos,zpos,0,"ONLY");
+
+  //
+  // Electronics boxes
+  //
+
+  // Casing (INOX)
+  parBox[0] = 60.0/2.0;
+  parBox[1] = 10.0/2.0;
+  parBox[2] =  6.0/2.0;
+  gMC->Gsvolu("UTE1","BOX ",idtmed[1308-1],parBox,kNparBox);
+  // Interior (air)
+  parBox[0] = parBox[0] - 0.5;
+  parBox[1] = parBox[1] - 0.5;
+  parBox[2] = parBox[2] - 0.5;
+  gMC->Gsvolu("UTE2","BOX ",idtmed[1302-1],parBox,kNparBox);
+  xpos      = 0.0;
+  ypos      = 0.0;
+  zpos      = 0.0;
+  gMC->Gspos("UTE2",1,"UTE1",xpos,ypos,zpos,0,"ONLY");
+  xpos      = 0.0;
+  ypos      =  fgkSlength/2.0 - 10.0/2.0 - 3.0;
+  zpos      = -fgkSheight/2.0 +  6.0/2.0 + 1.0;
+  gMC->Gspos("UTE1",1,"UTI1", xpos,ypos,zpos,0,"ONLY");
+  gMC->Gspos("UTE1",2,"UTI2", xpos,ypos,zpos,0,"ONLY");
+  gMC->Gspos("UTE1",3,"UTI3", xpos,ypos,zpos,0,"ONLY");
+
+  // Casing (INOX)
+  parBox[0] = 50.0/2.0;
+  parBox[1] = 15.0/2.0;
+  parBox[2] = 20.0/2.0;
+  gMC->Gsvolu("UTE3","BOX ",idtmed[1308-1],parBox,kNparBox);
+  // Interior (air)
+  parBox[0] = parBox[0] - 0.5;
+  parBox[1] = parBox[1] - 0.5;
+  parBox[2] = parBox[2] - 0.5;
+  gMC->Gsvolu("UTE4","BOX ",idtmed[1302-1],parBox,kNparBox);
+  xpos      = 0.0;
+  ypos      = 0.0;
+  zpos      = 0.0;
+  gMC->Gspos("UTE4",1,"UTE3",xpos,ypos,zpos,0,"ONLY");
+  xpos      = 0.0;
+  ypos      = -fgkSlength/2.0 + 15.0/2.0 + 3.0;
+  zpos      = -fgkSheight/2.0 + 20.0/2.0 + 1.0;
+  gMC->Gspos("UTE3",1,"UTI1", xpos,ypos,zpos,0,"ONLY");
+  gMC->Gspos("UTE3",2,"UTI2", xpos,ypos,zpos,0,"ONLY");
+  gMC->Gspos("UTE3",3,"UTI3", xpos,ypos,zpos,0,"ONLY");
+
+  // Casing (INOX)
+  parBox[0] = 20.0/2.0;
+  parBox[1] =  7.0/2.0;
+  parBox[2] = 20.0/2.0;
+  gMC->Gsvolu("UTE5","BOX ",idtmed[1308-1],parBox,kNparBox);
+  // Interior (air)
+  parBox[0] = parBox[0] - 0.5;
+  parBox[1] = parBox[1] - 0.5;
+  parBox[2] = parBox[2] - 0.5;
+  gMC->Gsvolu("UTE6","BOX ",idtmed[1302-1],parBox,kNparBox);
+  xpos      = 0.0;
+  ypos      = 0.0;
+  zpos      = 0.0;
+  gMC->Gspos("UTE6",1,"UTE5",xpos,ypos,zpos,0,"ONLY");
+  xpos      = 20.0;
+  ypos      = -fgkSlength/2.0 +  7.0/2.0 + 3.0;
+  zpos      = 0.0;
+  gMC->Gspos("UTE5",1,"UTI1", xpos,ypos,zpos,0,"ONLY");
+  gMC->Gspos("UTE5",2,"UTI2", xpos,ypos,zpos,0,"ONLY");
+  gMC->Gspos("UTE5",3,"UTI3", xpos,ypos,zpos,0,"ONLY");
+  xpos      = -xpos;
+  gMC->Gspos("UTE5",4,"UTI1", xpos,ypos,zpos,0,"ONLY");
+  gMC->Gspos("UTE5",5,"UTI2", xpos,ypos,zpos,0,"ONLY");
+  gMC->Gspos("UTE5",6,"UTI3", xpos,ypos,zpos,0,"ONLY");
+
 }
 
 //_____________________________________________________________________________
@@ -1318,42 +2433,35 @@ void AliTRDgeometry::GroupChamber(Int_t iplan, Int_t icham, Int_t *idtmed)
             ,xyzOrig[1]
             ,xyzOrig[2]
             ,0,"ONLY");
+  gMC->Gspos(cTagV,1,"UTI2"
+            ,xyzOrig[0]
+            ,xyzOrig[1]
+            ,xyzOrig[2]
+            ,0,"ONLY");
+  if (icham != 2) {
+    // W/o middle stack
+    gMC->Gspos(cTagV,1,"UTI3"
+              ,xyzOrig[0]
+              ,xyzOrig[1]
+              ,xyzOrig[2]
+              ,0,"ONLY");
+  }
 
 }
 
 //_____________________________________________________________________________
-Bool_t AliTRDgeometry::Rotate(Int_t d, Double_t *pos, Double_t *rot) const
-{
-  //
-  // Rotates all chambers in the position of sector 0 and transforms
-  // the coordinates in the ALICE restframe <pos> into the 
-  // corresponding local frame <rot>.
-  //
-
-  Int_t sector = GetSector(d);
-
-  rot[0] =  pos[0] * fRotA11[sector] + pos[1] * fRotA12[sector];
-  rot[1] = -pos[0] * fRotA21[sector] + pos[1] * fRotA22[sector];
-  rot[2] =  pos[2];
-
-  return kTRUE;
-
-}
-
-//_____________________________________________________________________________
-Bool_t AliTRDgeometry::RotateBack(Int_t d, Double_t *rot, Double_t *pos) const
+Bool_t AliTRDgeometry::RotateBack(Int_t det, Double_t *loc, Double_t *glb) const
 {
   //
-  // Rotates a chambers from the position of sector 0 into its
-  // original position and transforms the corresponding local frame 
-  // coordinates <rot> into the coordinates of the ALICE restframe <pos>.
+  // Rotates a chambers to transform the corresponding local frame
+  // coordinates <loc> into the coordinates of the ALICE restframe <glb>.
   //
 
-  Int_t sector = GetSector(d);
+  Int_t sector = GetSector(det);
 
-  pos[0] =  rot[0] * fRotB11[sector] + rot[1] * fRotB12[sector];
-  pos[1] = -rot[0] * fRotB21[sector] + rot[1] * fRotB22[sector];
-  pos[2] =  rot[2];
+  glb[0] = loc[0] * fRotB11[sector] - loc[1] * fRotB12[sector];
+  glb[1] = loc[0] * fRotB21[sector] + loc[1] * fRotB22[sector];
+  glb[2] = loc[2];
 
   return kTRUE;
 
@@ -1382,7 +2490,7 @@ Int_t AliTRDgeometry::GetDetector(Int_t p, Int_t c, Int_t s)
 }
 
 //_____________________________________________________________________________
-Int_t AliTRDgeometry::GetPlane(Int_t d) const
+Int_t AliTRDgeometry::GetPlane(Int_t d)
 {
   //
   // Reconstruct the plane number from the detector number
@@ -1404,141 +2512,196 @@ Int_t AliTRDgeometry::GetChamber(Int_t d) const
 }
 
 //_____________________________________________________________________________
-Int_t AliTRDgeometry::GetSector(Int_t d) const
+Int_t AliTRDgeometry::GetChamber(Double_t z, Int_t plane)
 {
   //
-  // Reconstruct the sector number from the detector number
+  // Reconstruct the chamber number from the z position and plane number
+  //
+  // The return function has to be protected for positiveness !!
   //
 
-  return ((Int_t) (d / (fgkNplan * fgkNcham)));
+  if ((plane <         0) || 
+      (plane >= fgkNplan)) return -1;
+       
+  Int_t    ichmb = fgkNcham;
+  Double_t zmin;
+  Double_t zmax;
+
+  do {
+    ichmb--;
+    if (ichmb < 0) break;
+    AliTRDpadPlane *pp = GetPadPlane(plane,ichmb);
+    zmax  = pp->GetRow0();
+    Int_t nrows = pp->GetNrows();
+    zmin = zmax -         2 * pp->GetLengthOPad() 
+                - (nrows-2) * pp->GetLengthIPad() 
+                - (nrows-1) * pp->GetRowSpacing();
+  } while((z < zmin) || (z > zmax));
+  
+  return ichmb;
 
 }
 
-//CL
 //_____________________________________________________________________________
-Int_t AliTRDgeometry::GetPadRowFromMCM(Int_t irob, Int_t imcm) const
+Int_t AliTRDgeometry::GetSector(Int_t d) const
 {
+  //
+  // Reconstruct the sector number from the detector number
+  //
 
-  // return on which row this mcm sits 
-
-  return fgkMCMrow*(irob/2) + imcm/fgkMCMrow;
+  return ((Int_t) (d / (fgkNplan * fgkNcham)));
 
-;
 }
 
 //_____________________________________________________________________________
-Int_t AliTRDgeometry::GetPadColFromADC(Int_t irob, Int_t imcm, Int_t iadc) const
+AliTRDpadPlane *AliTRDgeometry::GetPadPlane(Int_t p, Int_t c)
 {
   //
-  // return which pad is connected to this adc channel. return -1 if it
-  // is one of the not directly connected adc channels (0, 1 20)
+  // Returns the pad plane for a given plane <p> and chamber <c> number
   //
 
-  if (iadc < 2 || iadc > 19 ) return -1;
+  if (!fPadPlaneArray) {
+    CreatePadPlaneArray();
+  }
 
-  return (iadc-2) + (imcm%fgkMCMrow)*fgkPadmax + GetRobSide(irob)*fgkColmax/2;
+  Int_t ipp = GetDetectorSec(p,c);
+  return ((AliTRDpadPlane *) fPadPlaneArray->At(ipp));
 
 }
 
 //_____________________________________________________________________________
-Int_t AliTRDgeometry::GetMCMfromPad(Int_t irow, Int_t icol) const
+Int_t AliTRDgeometry::GetRowMax(Int_t p, Int_t c, Int_t /*s*/)
 {
+  //
+  // Returns the number of rows on the pad plane
+  //
 
-  // return on which mcm this pad is
-
-  if ( irow < 0 || icol < 0 || irow > fgkRowmaxC1 || icol > fgkColmax ) return -1;
-
-  return (icol%(fgkColmax/2))/fgkPadmax + fgkMCMrow*(irow%fgkMCMrow);
+  return GetPadPlane(p,c)->GetNrows();
 
 }
 
 //_____________________________________________________________________________
-Int_t AliTRDgeometry::GetROBfromPad(Int_t irow, Int_t icol) const
+Int_t AliTRDgeometry::GetColMax(Int_t p)
 {
+  //
+  // Returns the number of rows on the pad plane
+  //
 
-  // return on which rob this pad is
-
-  return (irow/fgkMCMrow)*2 + GetColSide(icol);
+  return GetPadPlane(p,0)->GetNcols();
 
 }
 
 //_____________________________________________________________________________
-Int_t AliTRDgeometry::GetRobSide(Int_t irob) const
+Double_t AliTRDgeometry::GetRow0(Int_t p, Int_t c, Int_t /*s*/)
 {
+  //
+  // Returns the position of the border of the first pad in a row
+  //
 
-  // return on which side this rob sits (A side = 0, B side = 1)
-
-  if ( irob < 0 || irob >= fgkROBmaxC1 ) return -1;
-
-  return irob%2;
+  return GetPadPlane(p,c)->GetRow0();
 
 }
 
 //_____________________________________________________________________________
-Int_t AliTRDgeometry::GetColSide(Int_t icol) const
+Double_t AliTRDgeometry::GetCol0(Int_t p)
 {
+  //
+  // Returns the position of the border of the first pad in a column
+  //
 
-  // return on which side this column sits (A side = 0, B side = 1)
-
-  if ( icol < 0 || icol >= fgkColmax ) return -1;
-
-  return icol/(fgkColmax/2);
+  return GetPadPlane(p,0)->GetCol0();
 
 }
 
 //_____________________________________________________________________________
-AliTRDgeometry *AliTRDgeometry::GetGeometry(AliRunLoader *runLoader)
-{
+//Int_t AliTRDgeometry::GetPadRowFromMCM(Int_t irob, Int_t imcm) const
+//{
   //
-  // Load the geometry from the galice file
+  // Return on which row this mcm sits 
   //
+//
+//  return fgkMCMrow*(irob/2) + imcm/fgkMCMrow;
+//
+//}
 
-  if (!runLoader) {
-    runLoader = AliRunLoader::GetRunLoader();
-  }
-  if (!runLoader) {
-    AliErrorGeneral("AliTRDgeometry::GetGeometry","No run loader");
-    return NULL;
-  }
-
-  TDirectory *saveDir = gDirectory;
-  runLoader->CdGAFile();
+//_____________________________________________________________________________
+//Int_t AliTRDgeometry::GetPadColFromADC(Int_t irob, Int_t imcm, Int_t iadc) const
+//{
+  //
+  // Return which pad is connected to this adc channel. return -1 if it
+  // is one of the not directly connected adc channels (0, 1 20)
+  //
+//
+//  if (iadc < 2 || iadc > 19 ) return -1;
+//
+//  return (iadc-2) + (imcm%fgkMCMrow)*fgkPadmax + GetRobSide(irob)*fgkColmax/2;
+//
+//}
 
-  // Try from the galice.root file
-  AliTRDgeometry *geom = (AliTRDgeometry *) gDirectory->Get("TRDgeometry");
+//_____________________________________________________________________________
+//Int_t AliTRDgeometry::GetMCMfromPad(Int_t irow, Int_t icol) const
+//{
+  //
+  // Return on which mcm this pad is
+  //
+//
+//  if ( irow < 0 || icol < 0 || irow > fgkRowmaxC1 || icol > fgkColmax ) return -1;
+//
+//  return (icol%(fgkColmax/2))/fgkPadmax + fgkMCMrow*(irow%fgkMCMrow);
+//
+//}
 
-  if (!geom) {
-    // If it is not in the file, try to get it from the run loader 
-    if (runLoader->GetAliRun()) {
-      AliTRD *trd = (AliTRD *) runLoader->GetAliRun()->GetDetector("TRD");
-      geom = trd->GetGeometry();
-    }
-  }
-  if (!geom) {
-    AliErrorGeneral("AliTRDgeometry::GetGeometry","Geometry not found");
-    return NULL;
-  }
+//_____________________________________________________________________________
+//Int_t AliTRDgeometry::GetROBfromPad(Int_t irow, Int_t icol) const
+//{
+  //
+  // Return on which rob this pad is
+  //
+//
+//  return (irow/fgkMCMrow)*2 + GetColSide(icol);
+//
+//}
 
-  saveDir->cd();
-  return geom;
+//_____________________________________________________________________________
+//Int_t AliTRDgeometry::GetRobSide(Int_t irob) const
+//{
+  //
+  // Return on which side this rob sits (A side = 0, B side = 1)
+  //
+//
+//  if ( irob < 0 || irob >= fgkROBmaxC1 ) return -1;
+//
+//  return irob%2;
+//
+//}
 
-}
+//_____________________________________________________________________________
+//Int_t AliTRDgeometry::GetColSide(Int_t icol) const
+//{
+  //
+  // Return on which side this column sits (A side = 0, B side = 1)
+  //
+//
+//  if ( icol < 0 || icol >= fgkColmax ) return -1;
+//
+//  return icol/(fgkColmax/2);
+//
+//}
 
 //_____________________________________________________________________________
-Bool_t AliTRDgeometry::ReadGeoMatrices()
+Bool_t AliTRDgeometry::CreateClusterMatrixArray()
 {
   //
-  // Read geo matrices from current gGeoManager for each TRD sector
+  // Create the matrices to transform cluster coordinates from the 
+  // local chamber system to the tracking coordinate system
   //
 
   if (!gGeoManager) {
     return kFALSE;
   }
 
-  fMatrixArray           = new TObjArray(kNdet); 
-  fMatrixCorrectionArray = new TObjArray(kNdet);
-  fMatrixGeo             = new TObjArray(kNdet);
-  AliAlignObjAngles o;
+  fClusterMatrixArray = new TObjArray(kNdet);
+  AliAlignObjParams o;
 
   for (Int_t iLayer = AliGeomManager::kTRD1; iLayer <= AliGeomManager::kTRD6; iLayer++) {
     for (Int_t iModule = 0; iModule < AliGeomManager::LayerSize(iLayer); iModule++) {
@@ -1550,28 +2713,24 @@ Bool_t AliTRDgeometry::ReadGeoMatrices()
       if (pne) {
         path = pne->GetTitle();
       }
+      if (!strstr(path,"ALIC")) {
+        AliDebug(1,Form("Not a valid path: %s\n",path));
+        continue;
+      }
       if (!gGeoManager->cd(path)) {
-        return kFALSE;
+        AliError(Form("Cannot go to path: %s\n",path));
+        continue;
       }
       TGeoHMatrix *m         = gGeoManager->GetCurrentMatrix();
       Int_t        iLayerTRD = iLayer - AliGeomManager::kTRD1;
-      Int_t        isector   = Nsect() - 1 - (iModule/Ncham());
-      Int_t        ichamber  = Ncham() - 1 - (iModule%Ncham());
+      Int_t        isector   = iModule/Ncham();
+      Int_t        ichamber  = iModule%Ncham();
       Int_t        lid       = GetDetector(iLayerTRD,ichamber,isector);    
-
-      //
-      // Local geo system z-x-y  to x-y--z 
-      //
-      fMatrixGeo->AddAt(new TGeoHMatrix(*m),lid);
       
       TGeoRotation mchange; 
       mchange.RotateY(90); 
       mchange.RotateX(90);
 
-      TGeoHMatrix gMatrix(mchange.Inverse());
-      gMatrix.MultiplyLeft(m);
-      fMatrixArray->AddAt(new TGeoHMatrix(gMatrix),lid); 
-
       //
       // Cluster transformation matrix
       //
@@ -1580,9 +2739,9 @@ Bool_t AliTRDgeometry::ReadGeoMatrices()
       Double_t sectorAngle = 20.0 * (isector % 18) + 10.0;
       TGeoHMatrix  rotSector;
       rotSector.RotateZ(sectorAngle);
-      rotMatrix.MultiplyLeft(&rotSector);      
+      rotMatrix.MultiplyLeft(&rotSector.Inverse());
 
-      fMatrixCorrectionArray->AddAt(new TGeoHMatrix(rotMatrix),lid);       
+      fClusterMatrixArray->AddAt(new TGeoHMatrix(rotMatrix),lid);       
 
     }    
   }
@@ -1591,3 +2750,22 @@ Bool_t AliTRDgeometry::ReadGeoMatrices()
 
 }
 
+//_____________________________________________________________________________
+Bool_t AliTRDgeometry::ChamberInGeometry(Int_t det)
+{
+  //
+  // Checks whether the given detector is part of the current geometry
+  //
+
+  if (!fClusterMatrixArray) {
+    CreateClusterMatrixArray();
+  }  
+
+  if (!GetClusterMatrix(det)) {
+    return kFALSE;
+  }
+  else {
+    return kTRUE;
+  }
+
+}