]> git.uio.no Git - u/mrichter/AliRoot.git/blobdiff - STRUCT/AliSHILv0.cxx
Clean-up of include files
[u/mrichter/AliRoot.git] / STRUCT / AliSHILv0.cxx
index 16bc1e9eecf81a05dbd5e3a80c2112dd5a1af132..c985b532dbda8ea653c6e210b9c0e75e6db7c969 100644 (file)
  * provided "as is" without express or implied warranty.                  *
  **************************************************************************/
 
-/*
-$Log$
-Revision 1.12  2001/03/16 16:26:05  morsch
-Put vacuum in beam-pipe not air.
-
-Revision 1.11  2000/10/27 15:21:24  morsch
-Shield composition after muon project leader meeting: 24/10/2000
-- 1 cm recess in steel for station 3
-- no heavy shielding between chambers for stations 1 and 2
-
-Revision 1.10  2000/10/02 21:28:15  fca
-Removal of useless dependecies via forward declarations
-
-Revision 1.9  2000/09/12 17:00:45  morsch
-Overlaps in YMO3 and YMO4 (side-effect from last update only) corrected.
-
-Revision 1.8  2000/09/12 16:11:43  morsch
-- Bug in volume YGO2 corrected: PCON started with twice the same z-value.
-- Recesses for chambers added to outer Pb cone.
-
-Revision 1.7  2000/06/15 09:40:31  morsch
-Obsolete typedef keyword removed
-
-Revision 1.6  2000/06/13 15:01:38  morsch
-Make kind of heavy shielding material (Pb, NiCuW) dependent on presence of outer cone.
-
-Revision 1.5  2000/06/12 19:40:00  morsch
-New structure of beam pipe and heating jacket.
-Optional outer Pb cone added. Not yet compatible with chamber inner radii.
-
-Revision 1.4  2000/04/03 08:13:40  fca
-Introduce extra scope for non ANSI compliant C++ compilers
-
-Revision 1.3  2000/01/17 10:29:30  morsch
-Overlap between Shield and Absorber due to limited numerical precision removed
-by displacing the Shield by epsilon = 0.01 cm.
-
-Revision 1.2  2000/01/13 11:27:51  morsch
-Overlaps corrected: YCS3, YCS4; Inner radius YS21 corrected
-
-Revision 1.1  2000/01/12 15:44:03  morsch
-Standard version of SHIL
-
-*/
+/* $Id$ */
 
 ///////////////////////////////////////////////////////////////////////////////
 //                                                                           //
@@ -72,35 +29,37 @@ Standard version of SHIL
 //                                                                           //
 ///////////////////////////////////////////////////////////////////////////////
 
-#include "AliSHILv0.h"
-#include "AliRun.h"
-#include "AliMC.h"
+#include <TVirtualMC.h>
+#include <TArrayI.h>
+
 #include "AliConst.h"
+#include "AliRun.h"
+#include "AliSHILv0.h"
+#include "AliLog.h"
 
 ClassImp(AliSHILv0)
  
 //_____________________________________________________________________________
-AliSHILv0::AliSHILv0()
+AliSHILv0::AliSHILv0():
+    fPbCone(1)
 {
   //
   // Default constructor for muon shield
   //
+    
 }
  
 //_____________________________________________________________________________
 AliSHILv0::AliSHILv0(const char *name, const char *title)
-  : AliSHIL(name,title)
+    : AliSHIL(name,title), 
+      fPbCone(1)
 {
   //
   // Standard constructor for muon shield
   //
-  SetMarkerColor(7);
-  SetMarkerStyle(2);
-  SetMarkerSize(0.4);
   // Pb  cone not yet compatible with muon chamber inner radii
   // Switched off by default
-  fPbCone=kFALSE;
-}
+ }
  
 //_____________________________________________________________________________
 void AliSHILv0::CreateGeometry()
@@ -120,8 +79,8 @@ void AliSHILv0::CreateGeometry()
   */
   //End_Html
 
-    Float_t cpar[5], cpar0[5], tpar[3], par1[39], par2[27], par3[27], 
-       par4[21], par0[45];
+    Float_t cpar[5], cpar0[5], tpar[3], par1[39], pars1[100], par2[36], par3[27], 
+       par4[24], par0[87];
     Float_t dz, dZ;
   
     Int_t *idtmed = fIdtmed->GetArray()-1699;
@@ -136,77 +95,143 @@ enum {kC=1705, kAl=1708, kFe=1709, kCu=1710, kW=1711, kPb=1712,
 // Material of the rear part of the shield
   Int_t iHeavy=kNiCuW;
   if (fPbCone) iHeavy=kPb;
-  
-  
 //
 // Mother volume
 //
-  Float_t dRear1=dRear;
+  Float_t dRear1=kDRear;
   
-  Float_t zstart=zRear-dRear1;
+  Float_t zstart=kZRear-dRear1;
   
   par0[0]  = 0.;
   par0[1]  = 360.;
-  par0[2]  = 13.;
+  par0[2]  = 28.;
 
-  Float_t dl=(zvac12-zstart)/2.;
+  Float_t dl=(kZvac12-zstart)/2.;
   dz=zstart+dl;
 //
+// start
   par0[3]  = -dl;
   par0[4]  = 0.;
-  par0[5]  = zstart * TMath::Tan(accMin);
-
-  par0[6]  = -dl+dRear1;
+  par0[5]  = zstart * TMath::Tan(kAccMin);
+// recess station 1
+  par0[6]  = -dz+kZch11;
   par0[7]  = 0.;
-  par0[8]  = zRear * TMath::Tan(accMin);
+  par0[8]  = kZch11 * TMath::Tan(kAccMin);
 
-  par0[9]  = -dl+dRear1;
+  par0[9]   = par0[6];
   par0[10]  = 0.;
-  par0[11]  = R11;
+  par0[11]  = 17.9;
 
-  par0[12]  = -dz+zvac4;
+  par0[12]  = -dz+kZch12;
   par0[13]  = 0.;
-  par0[14]  = R11;
-
-  par0[15]  = -dz+zvac4;
-  par0[16] = 0.;
-  par0[17] = R21;
+  par0[14]  = 17.9;
 
-  par0[18] = -dz+zvac6;
-  par0[19] = 0.;
-  par0[20] = R21;
+  par0[15]  = par0[12];
+  par0[16]  = 0.;
+  par0[17]  = kZch12 * TMath::Tan(kAccMin);
+// recess station 2
+  par0[18]  = -dz+kZch21;
+  par0[19]  = 0.;
+  par0[20]  = kZch21 * TMath::Tan(kAccMin);
 
-  par0[21] = -dz+zvac6;
+  par0[21]  = -dz+kZch21;
   par0[22] = 0.;
-  par0[23] = zvac6 * TMath::Tan(accMin);
+  par0[23] = 23.;
 
-  par0[24] = -dz+zConeE;
+  par0[24]  = -dz+kZch22;
   par0[25] = 0.;
-  par0[26] = 30.;
+  par0[26] = 23.;
 
-  par0[27] = -dz+zvac10;
-  par0[28] = 0.;
-  par0[29] = 30.;
-
-  par0[30] = -dz+zvac10;
+  par0[27]  = -dz+kZch22;
+  par0[28]  = 0.;
+  par0[29]  = kZch22 * TMath::Tan(kAccMin);
+//
+  par0[30] = -dz+kZvac6;
   par0[31] = 0.;
-  par0[32] = R42;
-
-  par0[33] = -dz+zvac11;
+  par0[32] = kZvac6 * TMath::Tan(kAccMin);
+// end of 2 deg cone
+  par0[33] = -dz+kZConeE;
   par0[34] = 0.;
-  par0[35] = R42;
+  par0[35] = 30.;
 
-  par0[36] = -dz+zvac11;
+  par0[36] = -dz+kZch31;
   par0[37] = 0.;
-  par0[38] = R43;
+  par0[38] = 30.;
 
-  par0[39] = -dz+zvac12;
+  par0[39] = -dz+kZch31;
   par0[40] = 0.;
-  par0[41] = R43;
+  par0[41] = 29.;
+
+  par0[42] = -dz+kZch32;
+  par0[43] = 0.;
+  par0[44] = 29.;
+// start of 1.6 deg cone
+  par0[45] = -dz+kZch32;
+  par0[46] = 0.;
+  par0[47] = 30.+(kZch32-kZConeE)*TMath::Tan(kThetaOpenPbO);
+// recess station 4
+  par0[48] = -dz+kZch41;
+  par0[49] = 0.;
+  par0[50] = 30.+(kZch41-kZConeE)*TMath::Tan(kThetaOpenPbO);
+
+  par0[51] = -dz+kZch41;
+  par0[52] = 0.;
+  par0[53] = 37.5;
+
+  par0[54] = -dz+kZch42;
+  par0[55] = 0.;
+  par0[56] = 37.5;
+
+  par0[57] = -dz+kZch42;
+  par0[58] = 0.;
+  par0[59] = 30.+(kZch42-kZConeE)*TMath::Tan(kThetaOpenPbO);
+
+// recess station 5
+
+  par0[60] = -dz+kZch51;
+  par0[61] = 0.;
+  par0[62] = 30.+(kZch51-kZConeE)*TMath::Tan(kThetaOpenPbO);
+
+  par0[63] = -dz+kZch51;
+  par0[64] = 0.;
+  par0[65] = 37.5;
+
+  par0[66] = -dz+kZch52;
+  par0[67] = 0.;
+  par0[68] = 37.5;
+
+  par0[69] = -dz+kZch52;
+  par0[70] = 0.;
+  par0[71] = 30.+(kZch52-kZConeE)*TMath::Tan(kThetaOpenPbO);
+
+// end of cone
+
+  par0[72] = -dz+kZvac10;
+  par0[73] = 0.;
+  par0[74] = 30.+(kZvac10-kZConeE)*TMath::Tan(kThetaOpenPbO);
+
+  par0[75] = -dz+kZvac10;
+  par0[76] = 0.;
+  par0[77] = kR42;
+
+  par0[78] = -dz+kZvac11;
+  par0[79] = 0.;
+  par0[80] = kR42;
+
+  par0[81] = -dz+kZvac11;
+  par0[82] = 0.;
+  par0[83] = kR43;
 
-  gMC->Gsvolu("YMOT", "PCON", idtmed[kVacuum], par0, 42);
+  par0[84] = -dz+kZvac12;
+  par0[85] = 0.;
+  par0[86] = kR43;
+
+  gMC->Gsvolu("YMOT", "PCON", idtmed[kVacuum], par0, 87);
   dz=zstart+dl;
   gMC->Gspos("YMOT", 1, "ALIC", 0., 0., dz, 0, "ONLY");  
+  gMC->Gsbool("YMOT","L3DO");
+  gMC->Gsbool("YMOT","L3O1");
+  gMC->Gsbool("YMOT","L3O2");
 //
 
   dZ=-dl;
@@ -218,64 +243,66 @@ enum {kC=1705, kAl=1708, kFe=1709, kCu=1710, kW=1711, kPb=1712,
   par1[0]  = 0.;
   par1[1]  = 360.;
   par1[2]  = 12.;
-  dl=(zvac4-zstart)/2.;
+  dl=(kZvac4-zstart)/2.;
   
   par1[3]  = -dl;
-  par1[4]  = rAbs+(zstart-zOpen) * TMath::Tan(thetaOpen1);
-  par1[5]  = zstart * TMath::Tan(accMin);
+  par1[4]  = kRAbs+(zstart-kZOpen) * TMath::Tan(kThetaOpen1);
+  par1[5]  = zstart * TMath::Tan(kAccMin);
 
-  par1[6]  = -dl+zvac1-zstart;
-  par1[7]  = rAbs+ (zvac1-zOpen) * TMath::Tan(thetaOpen1);
-  par1[8]  = zvac1 * TMath::Tan(accMin);
+  par1[6]  = -dl+kZvac1-zstart;
+  par1[7]  = kRAbs+ (kZvac1-kZOpen) * TMath::Tan(kThetaOpen1);
+  par1[8]  = kZvac1 * TMath::Tan(kAccMin);
 
-  par1[9]  = par1[6]+dr11;
-  par1[10] = par1[7]+dr11;
-  par1[11] = (zvac1+dr11) * TMath::Tan(accMin);
+  par1[9]  = par1[6]+kDr11/2.;
+  par1[10] = par1[7]+kDr11;
+  par1[11] = (kZvac1+kDr11/2.) * TMath::Tan(kAccMin);
 
   par1[12] = -dl+dRear1;
   par1[13] = par1[10];
-  par1[14] = zRear * TMath::Tan(accMin);
+  par1[14] = kZRear * TMath::Tan(kAccMin);
 
   par1[15] = -dl+dRear1;
   par1[16] = par1[10];
-  par1[17] = R11;
+  par1[17] = kR11;
 
-  par1[18] = -dl+(zvac1+dr11+dB1-zstart);
+  par1[18] = -dl+(kZvac1+kDr11+kDB1-zstart);
   par1[19] = par1[16];
-  par1[20] = R11;
+  par1[20] = kR11;
 
-  par1[21] = par1[18]+dr12;
-  par1[22] = par1[19]+dr12;
-  par1[23] = R11;
+  par1[21] = par1[18]+kDr12;
+  par1[22] = par1[19]+kDr12;
+  par1[23] = kR11;
 
-  par1[24] = par1[21]+dF1;
+  par1[24] = par1[21]+kDF1;
   par1[25] = par1[22];
-  par1[26] = R11;
+  par1[26] = kR11;
 
-  par1[27] = par1[24]+dr12;
-  par1[28] = par1[25]-dr12;
-  par1[29] = R11;
+  par1[27] = par1[24]+kDr12;
+  par1[28] = par1[25]-kDr12; 
+  par1[29] = kR11;
 
-  par1[30] = par1[27]+dB1;
+  par1[30] = par1[27]+kDB1;
   par1[31] = par1[28];
-  par1[32] = R11;
+  par1[32] = kR11;
 
-  par1[33] = par1[30]+dr13;
-  par1[34] = par1[31]-dr13;
-  par1[35] = R11;
+  par1[33] = par1[30]+kDr13;
+  par1[34] = par1[31]-kDr13;
+  par1[35] = kR11;
 
-  par1[36] = -dl+zvac4-zstart;
-  par1[37] = par1[34]+(zvac4-zvac3)*TMath::Tan(thetaOpen2);
-  par1[38] = R11;
+  par1[36] = -dl+kZvac4-zstart;
+  par1[37] = par1[34];
+  par1[38] = kR11;
 
-  Float_t r2=par1[34];
-  Float_t rBox=par1[31]-0.1;
+  Float_t r2  = par1[37];
+  Float_t rBox= par1[31]-0.1;
 
   gMC->Gsvolu("YGO1", "PCON", idtmed[kNiCuW], par1, 39);
-  { // Begin local scope for i
-      for (Int_t i=4; i<38; i+=3) par1[i]  = 0;
-  } // End local scope for i
-  gMC->Gsvolu("YMO1", "PCON", idtmed[kVacuum+40], par1, 39);
+  Int_t i;
+  
+  for (i=0; i<39; i++)  pars1[i]  = par1[i];
+  for (i=4; i<38; i+=3) pars1[i]  = 0.;
+
+  gMC->Gsvolu("YMO1", "PCON", idtmed[kVacuum+40], pars1, 39);
   gMC->Gspos("YGO1", 1, "YMO1", 0., 0., 0., 0, "ONLY");  
   dZ+=dl;
   gMC->Gspos("YMO1", 1, "YMOT", 0., 0., dZ, 0, "ONLY");  
@@ -283,43 +310,48 @@ enum {kC=1705, kAl=1708, kFe=1709, kCu=1710, kW=1711, kPb=1712,
 
 //
 // Steel envelope
-  tpar[0]=R11-dRSteel1;
-  tpar[1]=R11;
-  tpar[2]=dl-dRear1/2;
+  tpar[0]=kR11-kDRSteel2;
+  tpar[1]=kR11;
+  tpar[2]=(kZvac4-kZvac3)/2.;
   gMC->Gsvolu("YSE1", "TUBE", idtmed[kNiCuW], tpar, 3);
   dz=dl-tpar[2];
   gMC->Gspos("YSE1", 1, "YGO1", 0., 0., dz, 0, "ONLY");
+
 //
 // 1st section: vacuum system
 //
 //
 // Bellow 1
 //
-  tpar[0]=rB1;
-  tpar[1]=rB1+hB1;
-  tpar[2]=eB1/2.;
+
+//
+// Bellow 1
+//
+  tpar[0]=kRB1;
+  tpar[1]=kRB1+kHB1;
+  tpar[2]=kEB1/2.;
   gMC->Gsvolu("YB11", "TUBE", idtmed[kSteel+40], tpar, 3);
   Float_t dl1=tpar[2];
   
-  tpar[0]=rB1+hB1-eB1;
-  tpar[1]=rB1+hB1;
-  tpar[2]=(lB1/2.-2.*eB1)/2.;
+  tpar[0]=kRB1+kHB1-kEB1;
+  tpar[1]=kRB1+kHB1;
+  tpar[2]=(kLB1/2.-2.*kEB1)/2.;
   gMC->Gsvolu("YB12", "TUBE", idtmed[kSteel+40], tpar, 3);
   Float_t dl2=tpar[2];
 
-  tpar[0]=rB1-eB1;
-  tpar[1]=rB1;
-  tpar[2]=lB1/8.;
+  tpar[0]=kRB1-kEB1;
+  tpar[1]=kRB1;
+  tpar[2]=kLB1/8.;
   gMC->Gsvolu("YB13", "TUBE", idtmed[kSteel+40], tpar, 3);
   Float_t dl3=tpar[2];
 
 
   tpar[0]=0;
-  tpar[1]=rB1+hB1;
-  tpar[2]=lB1/2.;
+  tpar[1]=kRB1+kHB1;
+  tpar[2]=-kLB1/2.;
   gMC->Gsvolu("YBU1", "TUBE", idtmed[kVacuum+40], tpar, 3);
 
-  dz=-tpar[2]+dl3;
+  dz=-kLB1/2.+dl3;
   gMC->Gspos("YB13", 1, "YBU1", 0., 0., dz, 0, "ONLY"); 
   dz+=dl3;
   dz+=dl1;  
@@ -336,68 +368,80 @@ enum {kC=1705, kAl=1708, kFe=1709, kCu=1710, kW=1711, kPb=1712,
   
 
   tpar[0]=0;
-  tpar[1]=rB1+hB1;
-  tpar[2]=10.*lB1/2.;
+  tpar[1]=kRB1+kHB1+0.5;
+  tpar[2]=12.*kLB1/2.;
   gMC->Gsvolu("YBM1", "TUBE", idtmed[kVacuum+40], tpar, 3);
-  dz=-tpar[2]+lB1/2.;
-  { // Begin local scope for i
-      for (Int_t i=0; i<10; i++) {
-         gMC->Gspos("YBU1", i+1 , "YBM1", 0., 0., dz, 0, "ONLY"); 
-         dz+=lB1;
-      }
-  } // End local scope for i
-  dz=-dl+(zvac1-zstart)+dr11+tpar[2];
-  gMC->Gspos("YBM1", 1, "YMO1", 0., 0., dz, 0, "ONLY"); 
+  gMC->Gsdvn("YB1S", "YBM1", 12 , 3);
+
+  Float_t bsize = tpar[2];
+  tpar[0]=kRB1+kHB1;
+  tpar[2]=-kLB1/2.;
+  gMC->Gsvolu("YBI1", "TUBE", idtmed[kInsulation+40], tpar, 3);
 
-  dz=dl-dr13-(zvac4-zvac3)-tpar[2];
-  gMC->Gspos("YBM1", 2, "YMO1", 0., 0., dz, 0, "ONLY"); 
+  gMC->Gspos("YBI1", 1, "YB1S", 0., 0., 0., 0, "ONLY"); 
+  gMC->Gspos("YBU1", 1, "YB1S", 0., 0., 0., 0, "ONLY"); 
+
+  dz=-dl+(kZvac1-zstart)+kDr11/2.+bsize;
+  gMC->Gspos("YBM1", 1, "YMO1", 0., 0., dz, 0, "ONLY"); 
 
 //
 // Flange
 
   tpar[0]=0;
-  tpar[1]=rF1;
-  tpar[2]=dF1/2.;
+  tpar[1]=kRF1+0.6;
+  tpar[2]=kDF1/2.;
   gMC->Gsvolu("YFM1", "TUBE", idtmed[kVacuum+40], tpar, 3);
-
-  tpar[0]=rF1-2.;
-  tpar[1]=rF1;
-  tpar[2]=dF1/2.;
+// Steel
+  tpar[0]=kRB1;
+  tpar[1]=kRF1+0.6;
+  tpar[2]=kDF1/2.;
   gMC->Gsvolu("YF11", "TUBE", idtmed[kSteel+40], tpar, 3);
-  gMC->Gspos("YF11", 1, "YFM1", 0., 0., 0., 0, "ONLY"); 
+// Insulation
+  tpar[0]=kRF1;
+  tpar[1]=kRF1+0.5;
+  tpar[2]=kDF1/2.;
+  gMC->Gsvolu("YF12", "TUBE", idtmed[kInsulation+40], tpar, 3);
 
-  tpar[0]=rB1;
-  tpar[1]=rF1-2.;
-  tpar[2]=dFlange/2.;
-  gMC->Gsvolu("YF12", "TUBE", idtmed[kSteel+40], tpar, 3);
-  dz=-dF1/2.+tpar[2];
-  gMC->Gspos("YF12", 1, "YFM1", 0., 0., dz, 0, "ONLY"); 
-  dz= dF1/2.-tpar[2];
-  gMC->Gspos("YF12", 2, "YFM1", 0., 0., dz, 0, "ONLY"); 
 
-  dz=-dl+(zvac2-zstart);
+  gMC->Gspos("YF11", 1, "YFM1", 0., 0., 0., 0, "ONLY"); 
+  gMC->Gspos("YF12", 1, "YFM1", 0., 0., 0., 0, "ONLY"); 
+
+  dz=-dl+(kZvac1-zstart)+kDr11/2.+2.*bsize+kDF1/2.+3.;
   gMC->Gspos("YFM1", 2, "YMO1", 0., 0., dz, 0, "ONLY"); 
 
 //
 // pipe between flange and bellows
-  tpar[0]=rB1-dTubeS;
-  tpar[1]=rB1;
-  tpar[2]=2.*(dB1+dr12-10.*lB1)/4.;
+//
+// Steel 
+  tpar[0]=kRB1-dTubeS;
+  tpar[1]=kRB1+0.6;
+  tpar[2]=1.5;
   gMC->Gsvolu("YPF1", "TUBE", idtmed[kSteel+40], tpar, 3);
-  dz=-dl+(zvac2-zstart)-dF1/2.-tpar[2];
+// Insulation
+  tpar[0]=kRB1;
+  tpar[1]=kRB1+0.5;
+  gMC->Gsvolu("YPS1", "TUBE", idtmed[kInsulation+40], tpar, 3);
+  gMC->Gspos("YPS1", 1, "YPF1", 0., 0., 0., 0, "ONLY"); 
+
+  dz=dz-1.5-kDF1/2.;
   gMC->Gspos("YPF1", 1, "YMO1", 0., 0., dz, 0, "ONLY"); 
-  dz=-dl+(zvac2-zstart)+dF1/2.+tpar[2];
+  dz=dz+3.0+kDF1;
   gMC->Gspos("YPF1", 2, "YMO1", 0., 0., dz, 0, "ONLY"); 
+//
 
+// Pipe+Heating     1.5 mm 
+// Heating Jacket   5.0 mm
+// Protection       1.0 mm
+// ========================
+//                  7.5 mm
 // pipe and heating jackets outside bellows
 //
 // left side
-  cpar0[0]=(zvac1-zstart)/2;
-  cpar0[1]=rVacu+(zstart-zOpen)*TMath::Tan(thetaOpen1)-0.05;
-  cpar0[2]=rAbs +(zstart-zOpen)*TMath::Tan(thetaOpen1);
-  cpar0[3]=cpar0[1]+2.*cpar0[0]*TMath::Tan(thetaOpen1);
-  cpar0[4]=cpar0[2]+2.*cpar0[0]*TMath::Tan(thetaOpen1);
+  cpar0[0]=(kZvac1+kDr11/2.-zstart)/2;
+  cpar0[1]=kRVacu-0.05  +(zstart-kZOpen)*TMath::Tan(kThetaOpen1);
+  cpar0[2]=kRVacu+0.7   +(zstart-kZOpen)*TMath::Tan(kThetaOpen1);
+  cpar0[3]=cpar0[1]+2.*cpar0[0]*TMath::Tan(kThetaOpen1);
+  cpar0[4]=cpar0[2]+2.*cpar0[0]*TMath::Tan(kThetaOpen1);
   gMC->Gsvolu("YV11", "CONE", idtmed[kSteel+40], cpar0, 5);
 //
 // insulation
@@ -409,50 +453,33 @@ enum {kC=1705, kAl=1708, kFe=1709, kCu=1710, kW=1711, kPb=1712,
   cpar[4]=cpar0[3]+0.65;
   gMC->Gsvolu("YI11", "CONE", idtmed[kInsulation+40], cpar, 5);
   gMC->Gspos("YI11", 1, "YV11", 0., 0., 0., 0, "ONLY"); 
-//
-// clearance
-  cpar[1]=cpar0[1]+0.75;
-  cpar[2]=cpar0[1]+1.25;
-  cpar[3]=cpar0[3]+0.75;
-  cpar[4]=cpar0[3]+1.25;
-  gMC->Gsvolu("YP11", "CONE", idtmed[kVacuum+40], cpar, 5);
-  gMC->Gspos("YP11", 1, "YV11", 0., 0., 0., 0, "ONLY"); 
-  
   dz=-dl+cpar0[0];
   gMC->Gspos("YV11", 1, "YMO1", 0., 0., dz, 0, "ONLY"); 
+
 // right side
-  dTubeS=0.35;
-  dVacuS+=0.25;
+  dTubeS  = 0.35;
+  dVacuS += 0.25;
   
-  cpar0[0]=(zvac4-zvac3)/2;
-  cpar0[1]=rB1;
-  cpar0[2]=cpar0[1]+dVacuS;
-
-  cpar0[3]=cpar0[1]+2.*cpar0[0]*TMath::Tan(thetaOpenB);
-  cpar0[4]=cpar0[2]+2.*cpar0[0]*TMath::Tan(thetaOpenB);
+  cpar0[0] = (kZvac4-kZvac3)/2;
+  cpar0[1] = kRB1;
+  cpar0[2] = cpar0[1]+dVacuS;
+  cpar0[3] = cpar0[1]+2.*cpar0[0]*TMath::Tan(kThetaOpenB);
+  cpar0[4] = cpar0[2]+2.*cpar0[0]*TMath::Tan(kThetaOpenB);
   gMC->Gsvolu("YV12", "CONE", idtmed[kSteel], cpar0, 5);
   Float_t r2V=cpar0[3];
 //
 // insulation
-  cpar[0]=cpar0[0];
-  cpar[1]=cpar0[1]+dTubeS;
-  cpar[2]=cpar0[1]+dTubeS+dInsuS;
-  cpar[3]=cpar0[3]+dTubeS;
-  cpar[4]=cpar0[3]+dTubeS+dInsuS;
+  cpar[0] = cpar0[0];
+  cpar[1] = cpar0[1]+dTubeS;
+  cpar[2] = cpar0[1]+dTubeS+kDInsuS;
+  cpar[3] = cpar0[3]+dTubeS;
+  cpar[4] = cpar0[3]+dTubeS+kDInsuS;
   gMC->Gsvolu("YI12", "CONE", idtmed[kInsulation], cpar, 5);
   gMC->Gspos("YI12", 1, "YV12", 0., 0., 0., 0, "ONLY"); 
 
-//
-// clearance
-  cpar[1]=cpar0[1]+dTubeS+dInsuS+dEnveS;
-  cpar[2]=cpar0[1]+dTubeS+dInsuS+dEnveS+dFreeS;
-  cpar[3]=cpar0[3]+dTubeS+dInsuS+dEnveS;
-  cpar[4]=cpar0[3]+dTubeS+dInsuS+dEnveS+dFreeS;
-  gMC->Gsvolu("YP12", "CONE", idtmed[kAir], cpar, 5);
-  gMC->Gspos("YP12", 1, "YV12", 0., 0., 0., 0, "ONLY"); 
-  
   dz=dl-cpar0[0];
   gMC->Gspos("YV12", 1, "YMO1", 0., 0., dz, 0, "ONLY"); 
+
 //
 // Second Section
 // Between first and second bellow section
@@ -460,190 +487,136 @@ enum {kC=1705, kAl=1708, kFe=1709, kCu=1710, kW=1711, kPb=1712,
 
   par2[0]  = 0.;
   par2[1]  = 360.;
-  par2[2]  = 6.;
-  dl=(zvac7-zvac4)/2.;
-// recess station 2   
+  par2[2]  = 11.;
+  dl=(kZvac7-kZvac4)/2.;
+// recess station 2
   par2[3]  = -dl;
-  par2[4]  = r2+(zvac4-zvac3) * TMath::Tan(thetaOpen2);
-  par2[5]  = R21;
+  par2[4]  = r2;
+  par2[5]  = kR21;
 
-  par2[6]  = -dl+(zvac6-zvac4);
-  par2[7]  = r2+(zvac6-zvac3) * TMath::Tan(thetaOpen2);
-  par2[8]  = R21;
+  par2[6]  = -dl+.1;
+  par2[7]  = r2;
+  par2[8]  = kR21;
 
-  par2[9] = -dl+(zvac6-zvac4);
-  par2[10] = par2[7];
-  par2[11] = zvac6*TMath::Tan(accMin);
+  par2[9]   = -dl+(kZvac6-kZvac4);
+  par2[10]  = r2+(kZvac6-kZvac4-10.) * TMath::Tan(kThetaOpen2);
+  par2[11]  = kR21;
 
-// Start of Pb section
-  par2[12] = -dl+(zPb-zvac4);
-  par2[13] = r2+(zPb-zvac3) * TMath::Tan(thetaOpen2);
-  par2[14] = zPb*TMath::Tan(accMin);
+  par2[12] = -dl+(kZvac6-kZvac4);
+  par2[13] = par2[10];
+  par2[14] = kZvac6*TMath::Tan(kAccMin);
 
+// Start of Pb section
+  par2[15] = -dl+(kZPb-kZvac4);
+  par2[16] = r2+(kZPb-kZvac4-10.) * TMath::Tan(kThetaOpen2);
+  par2[17] = kZPb*TMath::Tan(kAccMin);
 //
 // end of cone following 2 deg line
-  par2[15] = -dl+(zConeE-zvac4);
-  par2[16] = r2+(zConeE-zvac3) * TMath::Tan(thetaOpen2);
-  par2[17] = 30.;
-
-  par2[18] = -dl+(zvac7-zvac4);
-  par2[19] = r2+(zvac7-zvac3) * TMath::Tan(thetaOpen2);
+  par2[18] = -dl+(kZConeE-kZvac4);
+  par2[19] = r2+(kZConeE-kZvac4-10.) * TMath::Tan(kThetaOpen2);
   par2[20] = 30.;
+// recess station 3
+  par2[21] = -dl+(kZch31-kZvac4);
+  par2[22] = r2+(kZch31-kZvac4-10.) * TMath::Tan(kThetaOpen2);
+  par2[23] = 30.;
+
+  par2[24] = -dl+(kZch31-kZvac4);
+  par2[25] = r2+(kZch31-kZvac4-10.) * TMath::Tan(kThetaOpen2);
+  par2[26] = 29.;
+
+  par2[27] = -dl+(kZch32-kZvac4);
+  par2[28] = r2+(kZch32-kZvac4-10.) * TMath::Tan(kThetaOpen2);
+  par2[29] = 29.;
+
+  par2[30] = -dl+(kZch32-kZvac4);
+  par2[31] = r2+(kZch32-kZvac4-10.) * TMath::Tan(kThetaOpen2);
+  par2[32] = 30.;
+
+  par2[33] = -dl+(kZvac7-kZvac4);
+  par2[34] = r2+(kZvac7-kZvac4-10.) * TMath::Tan(kThetaOpen2);
+  par2[35] = 30.;
 
+  gMC->Gsvolu("YGO2", "PCON", idtmed[kSteel+40], par2, 36);
 
-  gMC->Gsvolu("YGO2", "PCON", idtmed[kNiCuW+40], par2, 21);
 //
-// Lead cone option replacing Tungsten 
+// Lead cone 
 //
   Float_t parPb[12];
   parPb[0]  = 0.;
   parPb[1]  = 360.;
   parPb[2]  = 3.;
-  Float_t dlPb=(zvac7-zPb)/2.;
+  Float_t dlPb=(kZvac7-kZPb)/2.;
   
   parPb[3]  = -dlPb;
-  parPb[4]  = 17.657;
-  parPb[5]  = zPb*TMath::Tan(accMin);
+  parPb[4]  =  r2+(kZPb-kZvac4-10.) * TMath::Tan(kThetaOpen2);
+  parPb[5]  =  kZPb*TMath::Tan(kAccMin)-kDRSteel2;
   
-  parPb[6]  = -dlPb+(zConeE-zPb);
-  parPb[7]  = parPb[4]+(zConeE-zPb)*TMath::Tan(thetaOpenPb);
-  parPb[8]  = 30.;
+  parPb[6]  = -dlPb+(kZConeE-kZPb);
+  parPb[7]  =  r2+(kZConeE-kZvac4-10.) * TMath::Tan(kThetaOpen2);
+  parPb[8]  = 26.;
   
   parPb[9]   = dlPb;
-  parPb[10]  = parPb[7]+(zvac7-zConeE)*TMath::Tan(thetaOpenPb);
-  parPb[11]  = 30.;
-  
-  Float_t rPbLast=parPb[10];
-  
+  parPb[10]  =  r2+(kZvac7-kZvac4-10.) * TMath::Tan(kThetaOpen2);
+  parPb[11]  = 26.;
 
   gMC->Gsvolu("YXO2", "PCON", idtmed[kPb], parPb, 12);   
-  gMC->Gspos("YXO2", 1, "YGO2", 0., 0., (zPb-zvac4)/2., 0, "ONLY");  
+  gMC->Gspos("YXO2", 1, "YGO2", 0., 0., (kZPb-kZvac4)/2., 0, "ONLY");  
 
-  parPb[4]  = r2+(zPb-zvac3) * TMath::Tan(thetaOpen2);
-  parPb[5]  = 17.657;
+//
+// W cone 
+//
+  Float_t parW[15];
+  parW[0]  = 0.;
+  parW[1]  = 360.;
+  parW[2]  = 4.;
+  Float_t dlW=(kZPb-kZvac4)/2.;
   
-  parPb[7]  = r2+(zConeE-zvac3) * TMath::Tan(thetaOpen2);
-  parPb[8]  = parPb[5]+(zConeE-zPb)*TMath::Tan(thetaOpenPb);
+  parW[3]   = -dlW;
+  parW[4]   =  r2;
+  parW[5]   =  kR21-kDRSteel2;
   
-  parPb[10]  = r2+(zvac7-zvac3) * TMath::Tan(thetaOpen2);
-  parPb[11]  = parPb[8]+(zvac7-zConeE)*TMath::Tan(thetaOpenPb);
+  parW[6]   = -dlW+(kZvac6-kZvac4)+kDRSteel2;
+  parW[7]   =  r2+(kZvac6-kZvac4+kDRSteel2) * TMath::Tan(kThetaOpen2);
+  parW[8]   =  kR21-kDRSteel2;
+  parW[9]   = -dlW+(kZvac6-kZvac4)+kDRSteel2;
+  parW[10]  =  r2+(kZvac6-kZvac4+kDRSteel2) * TMath::Tan(kThetaOpen2);
+  parW[11]  =  (kZvac6+kDRSteel2)*TMath::Tan(kAccMin)-kDRSteel2;
+  parW[12]  = dlW;
+  parW[13]  =  r2+(kZPb-kZvac4) * TMath::Tan(kThetaOpen2);
+  parW[14]  = kZPb*TMath::Tan(kAccMin)-kDRSteel2;
 
-  gMC->Gsvolu("YYO2", "PCON", idtmed[iHeavy+40], parPb, 12);     
-  gMC->Gspos("YYO2", 1, "YGO2", 0., 0., (zPb-zvac4)/2., 0, "ONLY");  
-  
+  gMC->Gsvolu("YYO2", "PCON", idtmed[kNiCuW], parW, 15);         
+  gMC->Gspos("YYO2", 1, "YGO2", 0., 0., -(kZvac7-kZPb)/2., 0, "ONLY");  
 
-  { // Begin local scope for i
-      for (Int_t i=4; i<23; i+=3) par2[i]  = 0;
-  } // End local scope for i
+  for (i=4; i<35; i+=3) par2[i]  = 0;
           
-  gMC->Gsvolu("YMO2", "PCON", idtmed[kVacuum+40], par2, 24);
+  gMC->Gsvolu("YMO2", "PCON", idtmed[kVacuum+40], par2, 36);
   gMC->Gspos("YGO2", 1, "YMO2", 0., 0., 0., 0, "ONLY");  
   dZ+=dl;
   gMC->Gspos("YMO2", 1, "YMOT", 0., 0., dZ, 0, "ONLY");  
   dZ+=dl;
 //
-// Steel envelope
-//
-// (1)
-  tpar[0]=R11-dRSteel1;
-  tpar[1]=R21;
-  tpar[2]=2;
-  gMC->Gsvolu("YS21", "TUBE", idtmed[kSteel], tpar, 3);
-  dz=-dl+tpar[2];
-  gMC->Gspos("YS21", 1, "YGO2", 0., 0., dz, 0, "ONLY");  
-  dz+=tpar[2];
-// (2)
-  tpar[0]=R21-dRSteel2;
-  tpar[1]=R21;
-  tpar[2]=(zvac6-zvac5)/2.;
-  gMC->Gsvolu("YS22", "TUBE", idtmed[kSteel], tpar, 3);
-  dz+=tpar[2];
-  gMC->Gspos("YS22", 1, "YGO2", 0., 0., dz, 0, "ONLY");  
-  dz+=tpar[2];
-// (3)  
-  cpar[0]=2.;
-  cpar[1]=R21-dRSteel2;
-  cpar[2]=zvac6 * TMath::Tan(accMin);
-  cpar[3]=cpar[1];
-  cpar[4]=cpar[2]+4.*TMath::Tan(accMin);
-  gMC->Gsvolu("YS23", "CONE", idtmed[kSteel], cpar, 5);
-  dz+=cpar[0];
-  gMC->Gspos("YS23", 1, "YGO2", 0., 0., dz, 0, "ONLY");
-  dz+=cpar[0];
-// (4)
-  cpar[0]=(zPb-zvac6-4.)/2;
-  cpar[2]=cpar[4];
-  cpar[4]=cpar[2]+2.*cpar[0]*TMath::Tan(accMin);
-  cpar[1]=cpar[2]-dRSteel2;
-  cpar[3]=cpar[4]-dRSteel2;
-
-  gMC->Gsvolu("YS24", "CONE", idtmed[kSteel], cpar, 5);
-  dz+=cpar[0];
-  gMC->Gspos("YS24", 1, "YGO2", 0., 0., dz, 0, "ONLY");  
-  dz+=cpar[0];
-
-// (5) 
-  cpar[0]=(zConeE-zPb)/2;
-  cpar[2]=cpar[4];
-  cpar[4]=cpar[2]+2.*cpar[0]*TMath::Tan(accMin);
-  cpar[1]=cpar[2]-dRSteel2;
-  cpar[3]=cpar[4]-dRSteel2;
-
-  gMC->Gsvolu("YS25", "CONE", idtmed[kSteel], cpar, 5);
-  dz=-dlPb+cpar[0];
-  gMC->Gspos("YS25", 1, "YXO2", 0., 0., dz, 0, "ONLY");  
-  dz+=cpar[0];
-// (6)
-  tpar[0]=26.;
-  tpar[1]=30.;
-  tpar[2]=(zvac7-zConeE)/2.;
-
-  gMC->Gsvolu("YS26", "TUBE", idtmed[kSteel], tpar, 3);
-  dz+=tpar[2];
-  gMC->Gspos("YS26", 1, "YXO2", 0., 0., dz, 0, "ONLY");  
-  dz = -tpar[2];
-  
-// Recess in steel for station 3
-//
-  tpar[0]=29.;
-  tpar[1]=30.;
-  tpar[2]=(zch32-zch31)/2.;
-  gMC->Gsvolu("YS27", "TUBE", idtmed[kAir], tpar, 3);
-  dz+=(tpar[2]+zch31-zConeE);
-  
-  gMC->Gspos("YS27", 1, "YS26", 0., 0., dz, 0, "ONLY");  
-      
-// 
 //
 // 2nd section: vacuum system 
 //
-  cpar0[0]=(zvac7-zvac4)/2;
+  cpar0[0]=(kZvac7-kZvac4)/2;
   cpar0[1]=r2V;
   cpar0[2]=r2V+dVacuS;
-  cpar0[3]=cpar0[1]+2.*cpar0[0]*TMath::Tan(thetaOpenB);
-  cpar0[4]=cpar0[2]+2.*cpar0[0]*TMath::Tan(thetaOpenB);
+  cpar0[3]=cpar0[1]+2.*cpar0[0]*TMath::Tan(kThetaOpenB);
+  cpar0[4]=cpar0[2]+2.*cpar0[0]*TMath::Tan(kThetaOpenB);
   gMC->Gsvolu("YV21", "CONE", idtmed[kSteel+40], cpar0, 5);
 //
 // insulation
   cpar[0]=cpar0[0];
   cpar[1]=cpar0[1]+dTubeS;
-  cpar[2]=cpar0[1]+dTubeS+dInsuS;
+  cpar[2]=cpar0[1]+dTubeS+kDInsuS;
   cpar[3]=cpar0[3]+dTubeS;
-  cpar[4]=cpar0[3]+dTubeS+dInsuS;
+  cpar[4]=cpar0[3]+dTubeS+kDInsuS;
   gMC->Gsvolu("YI21", "CONE", idtmed[kInsulation+40], cpar, 5);
   gMC->Gspos("YI21", 1, "YV21", 0., 0., 0., 0, "ONLY"); 
-//
-// clearance
-  cpar[1]=cpar0[1]+dTubeS+dInsuS+dEnveS;
-  cpar[2]=cpar0[1]+dTubeS+dInsuS+dEnveS+dFreeS;
-  cpar[3]=cpar0[3]+dTubeS+dInsuS+dEnveS;
-  cpar[4]=cpar0[3]+dTubeS+dInsuS+dEnveS+dFreeS;
-  gMC->Gsvolu("YP21", "CONE", idtmed[kAir+40], cpar, 5);
-  gMC->Gspos("YP21", 1, "YV21", 0., 0., 0., 0, "ONLY"); 
-  
-  dz=0.;
-  gMC->Gspos("YV21", 1, "YMO2", 0., 0., dz, 0, "ONLY"); 
-
+  gMC->Gspos("YV21", 1, "YMO2", 0., 0., 0., 0, "ONLY"); 
 
 //
 // Third Section: Bellows and Flange 
@@ -651,38 +624,38 @@ enum {kC=1705, kAl=1708, kFe=1709, kCu=1710, kW=1711, kPb=1712,
   par3[0]  = 0.;
   par3[1]  = 360.;
   par3[2]  = 8.;
-  dl=(zvac9-zvac7)/2.;
+  dl=(kZvac9-kZvac7)/2.;
   
   par3[3]  = -dl;
-  par3[4]  = r2+(zvac7-zvac3) * TMath::Tan(thetaOpen2);
+  par3[4]  = r2+(kZvac7-kZvac3) * TMath::Tan(kThetaOpen2);
   par3[5]  = 30.;
 
-  par3[6]  = -dl+dr21;
-  par3[7]  = par3[4]+dr21;
+  par3[6]  = -dl+kDr21;
+  par3[7]  = par3[4]+kDr21;
   par3[8]  = 30.;
 
-  par3[9]  = par3[6]+dB2;
+  par3[9]  = par3[6]+kDB2;
   par3[10] = par3[7];
   par3[11] = 30.;
 
-  par3[12] = par3[9]+dr22;
-  par3[13] = par3[10]+dr22;
+  par3[12] = par3[9]+kDr22;
+  par3[13] = par3[10]+kDr22;
   par3[14] = 30.;
 
-  par3[15] = par3[12]+dF2;
+  par3[15] = par3[12]+kDF2;
   par3[16] = par3[13];
   par3[17] = 30.;
 
-  par3[18] = par3[15]+dr22;
-  par3[19] = par3[16]-dr22;
+  par3[18] = par3[15]+kDr22;
+  par3[19] = par3[16]-kDr22;
   par3[20] = 30.;
 
-  par3[21] = par3[18]+dB2;
+  par3[21] = par3[18]+kDB2;
   par3[22] = par3[19];
   par3[23] = 30.;
 
-  par3[24] = par3[21]+dr23;
-  par3[25] = par3[22]-dr23;
+  par3[24] = par3[21]+kDr23;
+  par3[25] = par3[22];
   par3[26] = 30.;
 //
   rBox=par3[22]-0.1;
@@ -690,16 +663,8 @@ enum {kC=1705, kAl=1708, kFe=1709, kCu=1710, kW=1711, kPb=1712,
   
   gMC->Gsvolu("YGO3", "PCON", idtmed[iHeavy+40], par3, 27);
 
-  parPb[0]  = dl;
-  parPb[1]  = rPbLast;
-  parPb[2]  = 30;
-  parPb[3]  = parPb[1]+2.*dl*TMath::Tan(thetaOpenPb);
-  parPb[4]  = 30;
-  gMC->Gsvolu("YXO3", "CONE", idtmed[kPb], parPb, 5);
-  gMC->Gspos("YXO3", 1, "YGO3", 0., 0., 0., 0, "ONLY");  
-  { // Begin local scope for i
-      for (Int_t i=4; i<26; i+=3) par3[i]  = 0;
-  } // End local scope for i
+  for (i=4; i<26; i+=3) par3[i]  = 0;
+
   gMC->Gsvolu("YMO3", "PCON", idtmed[kVacuum+40], par3, 27);
   gMC->Gspos("YGO3", 1, "YMO3", 0., 0., 0., 0, "ONLY");  
 
@@ -709,7 +674,7 @@ enum {kC=1705, kAl=1708, kFe=1709, kCu=1710, kW=1711, kPb=1712,
   tpar[1]=30;
   tpar[2]=dl;
   gMC->Gsvolu("YS31", "TUBE", idtmed[kSteel], tpar, 3);
-  gMC->Gspos("YS31", 1, "YXO3", 0., 0., 0., 0, "ONLY");  
+  gMC->Gspos("YS31", 1, "YGO3", 0., 0., 0., 0, "ONLY");  
   dZ+=dl;
   gMC->Gspos("YMO3", 1, "YMOT", 0., 0., dZ, 0, "ONLY");  
   dZ+=dl;
@@ -720,28 +685,28 @@ enum {kC=1705, kAl=1708, kFe=1709, kCu=1710, kW=1711, kPb=1712,
 //
 // Bellow2
 //
-  tpar[0]=rB2;
-  tpar[1]=rB2+hB2;
-  tpar[2]=eB2/2.;
+  tpar[0]=kRB2;
+  tpar[1]=kRB2+kHB2;
+  tpar[2]=kEB2/2.;
   gMC->Gsvolu("YB21", "TUBE", idtmed[kSteel+40], tpar, 3);
   dl1=tpar[2];
   
-  tpar[0]=rB2+hB2-eB2;
-  tpar[1]=rB2+hB2;
-  tpar[2]=(lB2/2.-2.*eB2)/2.;
+  tpar[0]=kRB2+kHB2-kEB2;
+  tpar[1]=kRB2+kHB2;
+  tpar[2]=(kLB2/2.-2.*kEB2)/2.;
   gMC->Gsvolu("YB22", "TUBE", idtmed[kSteel+40], tpar, 3);
   dl2=tpar[2];
 
-  tpar[0]=rB2-eB2;
-  tpar[1]=rB2;
-  tpar[2]=lB2/8.;
+  tpar[0]=kRB2-kEB2;
+  tpar[1]=kRB2;
+  tpar[2]=kLB2/8.;
   gMC->Gsvolu("YB23", "TUBE", idtmed[kSteel+40], tpar, 3);
   dl3=tpar[2];
 
 
   tpar[0]=0;
-  tpar[1]=rB2+hB2;
-  tpar[2]=lB2/2.;
+  tpar[1]=kRB2+kHB2;
+  tpar[2]=kLB2/2.;
   gMC->Gsvolu("YBU2", "TUBE", idtmed[kVacuum+40], tpar, 3);
 
   dz=-tpar[2]+dl3;
@@ -761,114 +726,111 @@ enum {kC=1705, kAl=1708, kFe=1709, kCu=1710, kW=1711, kPb=1712,
   
 
   tpar[0]=0;
-  tpar[1]=rB2+hB2;
-  tpar[2]=7.*lB2/2.;
+  tpar[1]=kRB2+kHB2;
+  tpar[2]=7.*kLB2/2.;
   gMC->Gsvolu("YBM2", "TUBE", idtmed[kVacuum+40], tpar, 3);
-  dz=-tpar[2]+lB2/2.;
-  { // Begin local scope for i
-      for (Int_t i=0; i<7; i++) {
-         gMC->Gspos("YBU2", i+1 , "YBM2", 0., 0.,dz , 0, "ONLY"); 
-         dz+=lB2;
-      }
-  } // End local scope for i
-  dz=-dl+dr21+tpar[2];
+  dz=-tpar[2]+kLB2/2.;
+
+  for (i=0; i<7; i++) {
+    gMC->Gspos("YBU2", i+1 , "YBM2", 0., 0.,dz , 0, "ONLY"); 
+    dz+=kLB2;
+  }
+
+  dz=-dl+kDr21+tpar[2];
   gMC->Gspos("YBM2", 1, "YMO3", 0., 0., dz, 0, "ONLY"); 
 
-  dz=dl-dr23-tpar[2];
+  dz=dl-kDr23-tpar[2];
   gMC->Gspos("YBM2", 2, "YMO3", 0., 0., dz, 0, "ONLY"); 
 
 //
 // Flange
 
   tpar[0]=0;
-  tpar[1]=rF2;
-  tpar[2]=dF2/2.;
+  tpar[1]=kRF2;
+  tpar[2]=kDF2/2.;
   gMC->Gsvolu("YFM2", "TUBE", idtmed[kVacuum+40], tpar, 3);
 
-  tpar[0]=rF2-2.;
-  tpar[1]=rF2;
-  tpar[2]=dF2/2.;
+  tpar[0]=kRF2-2.;
+  tpar[1]=kRF2;
+  tpar[2]=kDF2/2.;
   gMC->Gsvolu("YF21", "TUBE", idtmed[kSteel+40], tpar, 3);
   gMC->Gspos("YF21", 1, "YFM2", 0., 0., 0., 0, "ONLY"); 
 
-  tpar[0]=rB2;
-  tpar[1]=rF2-2.;
-  tpar[2]=dFlange/2.;
+  tpar[0]=kRB2;
+  tpar[1]=kRF2-2.;
+  tpar[2]=kDFlange/2.;
   gMC->Gsvolu("YF22", "TUBE", idtmed[kSteel+40], tpar, 3);
-  dz=-dF2/2.+tpar[2];
+  dz=-kDF2/2.+tpar[2];
   gMC->Gspos("YF22", 1, "YFM2", 0., 0., dz, 0, "ONLY"); 
-  dz= dF2/2.-tpar[2];
+  dz= kDF2/2.-tpar[2];
   gMC->Gspos("YF22", 2, "YFM2", 0., 0., dz, 0, "ONLY"); 
 
-  dz=dr21/2.-dr23/2.;
+  dz=kDr21/2.-kDr23/2.;
   gMC->Gspos("YFM2", 2, "YMO3", 0., 0., dz, 0, "ONLY"); 
 
 
 //
 // pipe between flange and bellows
-  tpar[0]=rB2-dTubeS;
-  tpar[1]=rB2;
-  tpar[2]=2.*(dB2+dr22-7.*lB2)/4.;
+  tpar[0]=kRB2-dTubeS;
+  tpar[1]=kRB2;
+  tpar[2]=2.*(kDB2+kDr22-7.*kLB2)/4.;
   gMC->Gsvolu("YPF2", "TUBE", idtmed[kSteel+40], tpar, 3);
-  dz=dr21/2.-dr23/2.-dF2/2.-tpar[2];
+  dz=kDr21/2.-kDr23/2.-kDF2/2.-tpar[2];
   gMC->Gspos("YPF2", 1, "YMO3", 0., 0., dz, 0, "ONLY"); 
-  dz=dr21/2.-dr23/2.+dF2/2.+tpar[2];
+  dz=kDr21/2.-kDr23/2.+kDF2/2.+tpar[2];
   gMC->Gspos("YPF2", 2, "YMO3", 0., 0., dz, 0, "ONLY"); 
 
+  Float_t dHorZ=20.;
+  
 //
 // 4th section: rear shield and closing cone
 //
   par4[0]  = 0.;
   par4[1]  = 360.;
-  par4[2]  = 6.;
-  dl=(zvac12-zvac9)/2.;
+  par4[2]  = 7.;
+  dl=(kZvac12-kZvac9)/2.;
   
   par4[3]  = -dl;
   par4[4]  = r3;
   par4[5]  = 30.;
 
-  par4[6]  = -dl+(zvac10-zvac9);
-  par4[7]  = r3+(zvac10-zvac9) * TMath::Tan(thetaOpen3);
+  par4[6]  = -dl+dHorZ;
+  par4[7]  = r3;
   par4[8]  = 30.;
 
-  par4[9]  = par4[6];
-  par4[10] = par4[7];
-  par4[11] = R42;
-
-  par4[12] = -dl+(zvac11-zvac9);
-  par4[13] = r3+(zvac11-zvac9) * TMath::Tan(thetaOpen3);
-  par4[14] = R42;
-
-  par4[15] = par4[12];
-  par4[16] = par4[13];
-  par4[17] = R43;
-
-  par4[18] = -dl+(zvac12-zvac9);
-  par4[19] = rAbs;
-  par4[20] = R43;
-
-  gMC->Gsvolu("YGO4", "PCON", idtmed[iHeavy+40], par4, 21);
-
-  parPb[0]  = (zvac10-zvac9)/2.;
-  parPb[1]  = parPb[3];
-  parPb[2]  = 30;
-  parPb[3]  = parPb[1]+2.*parPb[0]*TMath::Tan(thetaOpenPb);
-  parPb[4]  = 30;
-  gMC->Gsvolu("YXO4", "CONE", idtmed[kPb], parPb, 5);
-  gMC->Gspos("YXO4", 1, "YGO4", 0., 0., -dl+parPb[0], 0, "ONLY");  
-
-  parPb[0]  = (zvac12-zvac10)/2.;
-  parPb[1]  = parPb[3];
-  parPb[2]  = 31.;
-  parPb[3]  = parPb[1]+2.*parPb[0]*TMath::Tan(thetaOpenPb);
-  parPb[4]  = 31.;
-  gMC->Gsvolu("YXO5", "CONE", idtmed[kPb], parPb, 5);
-  gMC->Gspos("YXO5", 1, "YGO4", 0., 0., -dl+(zvac10-zvac9)+parPb[0], 0, "ONLY");  
-  { // Begin local scope for i
-      for (Int_t i=4; i<20; i+=3) par4[i]  = 0;
-  } // End local scope for i
-
-  gMC->Gsvolu("YMO4", "PCON", idtmed[kVacuum+40], par4, 21);
+  par4[9]  = -dl+(kZvac10-kZvac9);
+  par4[10]  = r3+(kZvac10-kZvac9-dHorZ) * TMath::Tan(kThetaOpen3);
+  par4[11]  = 30.;
+
+  par4[12]  = par4[9];
+  par4[13] = par4[10];
+  par4[14] = kR42;
+
+  par4[15] = -dl+(kZvac11-kZvac9);
+  par4[16] = r3+(kZvac11-kZvac9-dHorZ) * TMath::Tan(kThetaOpen3);
+  par4[17] = kR42;
+
+  par4[18] = par4[15];
+  par4[19] = par4[16];
+  par4[20] = kR43;
+
+  par4[21] = -dl+(kZvac12-kZvac9);
+  par4[22] = kRVacu+dVacuS;
+  par4[23] = kR43;
+
+  gMC->Gsvolu("YGO4", "PCON", idtmed[iHeavy+40], par4, 24);
+
+//  parPb[0]  = (kZvac12-kZvac10)/2.;
+//  parPb[1]  = parPb[3];
+//  parPb[2]  = 31.;
+//  parPb[3]  = parPb[1]+2.*parPb[0]*TMath::Tan(kThetaOpenPb);
+//  parPb[4]  = 31.;
+//  gMC->Gsvolu("YXO5", "CONE", idtmed[kPb], parPb, 5);
+//  gMC->Gspos("YXO5", 1, "YGO4", 0., 0., -dl+(kZvac10-kZvac9)+parPb[0], 0, "ONLY");  
+
+  for (i=4; i<23; i+=3) par4[i]  = 0;
+
+  gMC->Gsvolu("YMO4", "PCON", idtmed[kVacuum+40], par4, 24);
   gMC->Gspos("YGO4", 1, "YMO4", 0., 0., 0., 0, "ONLY");  
 
 
@@ -879,10 +841,10 @@ enum {kC=1705, kAl=1708, kFe=1709, kCu=1710, kW=1711, kPb=1712,
 //
 // Closing concrete cone 
 //
-  cpar[0]=(zvac12-zvac11)/2.;
-  cpar[1] = r3+(zvac11-zvac9) * TMath::Tan(thetaOpen3);
+  cpar[0]=(kZvac12-kZvac11)/2.;
+  cpar[1] = r3+(kZvac11-kZvac9-dHorZ) * TMath::Tan(kThetaOpen3);
   cpar[2] = cpar[1]+0.001;
-  cpar[3] = rAbs;
+  cpar[3] = kRVacu+dVacuS;
   cpar[4] = cpar[2];
   gMC->Gsvolu("YCC4", "CONE", idtmed[kConcrete+40], cpar, 5);
   dz=dl-cpar[0];
@@ -893,39 +855,31 @@ enum {kC=1705, kAl=1708, kFe=1709, kCu=1710, kW=1711, kPb=1712,
   dz=-dl;
   tpar[0]=26.;
   tpar[1]=30.;
-  tpar[2]=(zvac10-zvac9)/2.;
+  tpar[2]=(kZvac10-kZvac9)/2.;
   gMC->Gsvolu("YS41", "TUBE", idtmed[kSteel], tpar, 3);
   dz+=tpar[2];
-  gMC->Gspos("YS41", 1, "YXO4", 0., 0., 0., 0, "ONLY");  
-  dz+=tpar[2];
-/*
-  tpar[0]=30.;
-  tpar[1]=R41;
-  tpar[2]=2.;
-  gMC->Gsvolu("YS42", "TUBE", idtmed[kSteel], tpar, 3);
-  dz+=tpar[2];
-  gMC->Gspos("YS42", 1, "YGO4", 0., 0., dz, 0, "ONLY");  
+  gMC->Gspos("YS41", 1, "YGO4", 0., 0., dz, 0, "ONLY");  
   dz+=tpar[2];
-*/
-  tpar[0]=R41-dRSteel2;
-  tpar[1]=R41;
-  tpar[2]=(zvac11-zvac10)/2.;
-  gMC->Gsvolu("YS43", "TUBE", idtmed[kSteel], tpar, 3);
+
+  tpar[0]=kR41-kDRSteel2;
+  tpar[1]=kR41;
+  tpar[2]=(kZvac11-kZvac10)/2.;
+  gMC->Gsvolu("YS43", "TUBE", idtmed[kPb], tpar, 3);
   dz+=tpar[2];
   gMC->Gspos("YS43", 1, "YGO4", 0., 0., dz, 0, "ONLY");  
 //
 // rear lead shield
 //
-  tpar[0]=R41;
-  tpar[1]=R42;
-  tpar[2]=(zvac11-zvac10)/2.;
+  tpar[0]=kR41;
+  tpar[1]=kR42;
+  tpar[2]=(kZvac11-kZvac10)/2.;
   gMC->Gsvolu("YPBI", "TUBE", idtmed[kPb+40], tpar, 3);
   dz-=0;
   gMC->Gspos("YPBI", 1, "YGO4", 0., 0., dz, 0, "ONLY"); 
 
-  tpar[0]=R42-5;
-  tpar[1]=R42;
-  tpar[2]=(zvac11-zvac10)/2.;
+  tpar[0]=kR42-5;
+  tpar[1]=kR42;
+  tpar[2]=(kZvac11-kZvac10)/2.;
   gMC->Gsvolu("YPBO", "TUBE", idtmed[kPb], tpar, 3);
   gMC->Gspos("YPBO", 1, "YPBI", 0., 0., 0., 0, "ONLY"); 
   
@@ -934,93 +888,85 @@ enum {kC=1705, kAl=1708, kFe=1709, kCu=1710, kW=1711, kPb=1712,
 //
 
   tpar[0]=31.;
-  tpar[1]=R43;
-  tpar[2]=(zvac12-zvac11)/2.;
+  tpar[1]=kR43;
+  tpar[2]=(kZvac12-kZvac11)/2.;
   gMC->Gsvolu("YFEI", "TUBE", idtmed[kFe+40], tpar, 3);
   dz=dl-tpar[2];
   gMC->Gspos("YFEI", 1, "YGO4", 0., 0., dz, 0, "ONLY"); 
 
   tpar[0]=31.;
-  tpar[1]=R43;
+  tpar[1]=kR43;
   tpar[2]=2.5;
   gMC->Gsvolu("YFEO", "TUBE", idtmed[kFe], tpar, 3);
-  dz=-(zvac12-zvac11)/2.+tpar[2];
+  dz=-(kZvac12-kZvac11)/2.+tpar[2];
   gMC->Gspos("YFEO", 1, "YFEI", 0., 0., dz, 0, "ONLY"); 
 //
 // Magnet element 
 //
-  tpar[0]=0.;
-  tpar[1]=R43;
-  tpar[2]=50.;
-  gMC->Gsvolu("YAEM", "TUBE", idtmed[kVacuum], tpar, 3);
-  tpar[0]=rAbs;
-  tpar[1]=R43;
-  tpar[2]=50.;
+  tpar[0]= 0.;
+  tpar[1]=40.;
+  tpar[2]=85.;
+  gMC->Gsvolu("YAEM", "TUBE", idtmed[kAir], tpar, 3);
+  tpar[0]=17.6/2.;
+  tpar[1]=40.;
+  tpar[2]=85.;
   gMC->Gsvolu("YFEM", "TUBE", idtmed[kFe], tpar, 3);
   gMC->Gspos("YFEM", 1, "YAEM", 0., 0., 0., 0, "ONLY"); 
 
 //
-
-  dz=zvac12+50.;
-  gMC->Gspos("YAEM", 1, "ALIC", 0., 0., dz, 0, "ONLY"); 
-
+  dz=1921.6 + tpar[2];
+  gMC->Gspos("YAEM", 1, "ALIC", 0., 0.,  dz, 0, "ONLY"); 
 
 // 
 //
 // 4th section: vacuum system 
 //
 // up to closing cone
-  cpar0[0]=(zvac11-zvac9)/2;
-  cpar0[1]=r3-dVacuS;
-  cpar0[2]=r3;
-  cpar0[3]=cpar0[1]+2.*cpar0[0]*TMath::Tan(thetaOpen3);
-  cpar0[4]=cpar0[2]+2.*cpar0[0]*TMath::Tan(thetaOpen3);
+  
+  Float_t r3V=r3-kDr23+dVacuS-1.6;
+
+  cpar0[0]=(kZvac11-kZvac9)/2;
+  cpar0[1]=r3V-dVacuS;
+  cpar0[2]=r3V;
+  cpar0[3]=cpar0[1]+2.*cpar0[0]*TMath::Tan(kThetaOpen3);
+  cpar0[4]=cpar0[2]+2.*cpar0[0]*TMath::Tan(kThetaOpen3);
   gMC->Gsvolu("YV31", "CONE", idtmed[kSteel+40], cpar0, 5);
 //
 // insulation
   cpar[0]=cpar0[0];
   cpar[1]=cpar0[1]+dTubeS;
-  cpar[2]=cpar0[1]+dTubeS+dInsuS;
+  cpar[2]=cpar0[1]+dTubeS+kDInsuS;
   cpar[3]=cpar0[3]+dTubeS;
-  cpar[4]=cpar0[3]+dTubeS+dInsuS;
+  cpar[4]=cpar0[3]+dTubeS+kDInsuS;
   gMC->Gsvolu("YI31", "CONE", idtmed[kInsulation+40], cpar, 5);
   gMC->Gspos("YI31", 1, "YV31", 0., 0., 0., 0, "ONLY"); 
-//
-// clearance
-  cpar[1]=cpar0[2]-dProtS-dFreeS;
-  cpar[2]=cpar0[2]-dProtS;
-  cpar[3]=cpar0[4]-dProtS-dFreeS;
-  cpar[4]=cpar0[4]-dProtS;
-  gMC->Gsvolu("YP31", "CONE", idtmed[kVacuum+40], cpar, 5);
-  gMC->Gspos("YP31", 1, "YV31", 0., 0., 0., 0, "ONLY"); 
-  
   dz=-dl+cpar[0];
   gMC->Gspos("YV31", 1, "YMO4", 0., 0., dz, 0, "ONLY"); 
 //
 // closing cone
-  cpar0[0]=(zvac12-zvac11)/2;
-  cpar0[1]=r3-dVacuS+(zvac11-zvac9)*TMath::Tan(thetaOpen3);
-  cpar0[2]=r3       +(zvac11-zvac9)*TMath::Tan(thetaOpen3);
-  cpar0[3]=rVacu;
-  cpar0[4]=rVacu+dTubeS+dInsuS+dProtS+dFreeS;
+  cpar0[0]=(kZvac12-kZvac11)/2;
+  cpar0[1]=r3V-dVacuS+(kZvac11-kZvac9)*TMath::Tan(kThetaOpen3);
+  cpar0[2]=r3V       +(kZvac11-kZvac9)*TMath::Tan(kThetaOpen3);
+  cpar0[3]=kRVacu;
+  cpar0[4]=kRVacu+dTubeS+kDInsuS+kDProtS+kDFreeS;
   gMC->Gsvolu("YV32", "CONE", idtmed[kSteel+40], cpar0, 5);
 //
 // insulation
   cpar[0]=cpar0[0];
   cpar[1]=cpar0[1]+dTubeS;
-  cpar[2]=cpar0[1]+dTubeS+dInsuS;
+  cpar[2]=cpar0[1]+dTubeS+kDInsuS;
   cpar[3]=cpar0[3]+dTubeS;
-  cpar[4]=cpar0[3]+dTubeS+dInsuS;
+  cpar[4]=cpar0[3]+dTubeS+kDInsuS;
   gMC->Gsvolu("YI32", "CONE", idtmed[kInsulation+40], cpar, 5);
   gMC->Gspos("YI32", 1, "YV32", 0., 0., 0., 0, "ONLY"); 
 //
 // clearance
-  cpar[1]=cpar0[2]-dProtS-dFreeS;
-  cpar[2]=cpar0[2]-dProtS;
-  cpar[3]=cpar0[4]-dProtS-dFreeS;
-  cpar[4]=cpar0[4]-dProtS;
-  gMC->Gsvolu("YP32", "CONE", idtmed[kVacuum+40], cpar, 5);
-  gMC->Gspos("YP32", 1, "YV32", 0., 0., 0., 0, "ONLY"); 
+//  cpar[1]=cpar0[2]-kDProtS-kDFreeS;
+//  cpar[2]=cpar0[2]-kDProtS;
+//  cpar[3]=cpar0[4]-kDProtS-kDFreeS;
+//  cpar[4]=cpar0[4]-kDProtS;
+//  gMC->Gsvolu("YP32", "CONE", idtmed[kVacuum+40], cpar, 5);
+//  gMC->Gspos("YP32", 1, "YV32", 0., 0., 0., 0, "ONLY"); 
   
   dz=dl-cpar[0];
   gMC->Gspos("YV32", 1, "YMO4", 0., 0., dz, 0, "ONLY"); 
@@ -1030,9 +976,9 @@ enum {kC=1705, kAl=1708, kFe=1709, kCu=1710, kW=1711, kPb=1712,
 //  
   tpar[0] = 50.;
   tpar[1] = 310.;
-  tpar[2] = (zFilterOut - zFilterIn) / 2.;
+  tpar[2] = (kZFilterOut - kZFilterIn) / 2.;
   gMC->Gsvolu("YFIM", "TUBE", idtmed[kFe+40], tpar, 3);
-  dz = (zFilterIn + zFilterOut) / 2.;
+  dz = (kZFilterIn + kZFilterOut) / 2.;
   tpar[2] -= 10.;
   gMC->Gsvolu("YFII","TUBE", idtmed[kFe], tpar, 3);
   gMC->Gspos("YFII", 1, "YFIM", 0., 0., 0., 0, "ONLY");
@@ -1041,137 +987,206 @@ enum {kC=1705, kAl=1708, kFe=1709, kCu=1710, kW=1711, kPb=1712,
 // Shielding close to chamber
 //
 //
-  cpar[0]=(zch11-zRear)/2.;
-  cpar[1]=R11;
-  cpar[2]=zRear*TMath::Tan(accMin);
-  cpar[3]=R11;
-  cpar[4]=(zRear+2.*cpar[0])*TMath::Tan(accMin);
+  cpar[0]=(kZch11-kZRear)/2.;
+  cpar[1]=kR11;
+  cpar[2]=kZRear*TMath::Tan(kAccMin);
+  cpar[3]=kR11;
+  cpar[4]=(kZRear+2.*cpar[0])*TMath::Tan(kAccMin);
   gMC->Gsvolu("YCS1", "CONE", idtmed[kNiCuW], cpar, 5);
-  dz=zRear+cpar[0];
-  gMC->Gspos("YCS1", 1, "ALIC", 0., 0., dz, 0, "ONLY");
-
-/*
-  cpar[0]=(zvac4-zch12)/2.;
-  cpar[1]=R11;
-  cpar[2]=(zvac4-2.*cpar[0])*TMath::Tan(accMin);
-  cpar[3]=R11;
-  cpar[4]=R21;
-  gMC->Gsvolu("YCS2", "CONE", idtmed[kNiCuW], cpar, 5);
-  dz=zvac4-cpar[0];
-  gMC->Gspos("YCS2", 1, "ALIC", 0., 0., dz, 0, "ONLY");
-
-
-  cpar[0]=(zch12-zch11-2.)/2.;
-  cpar[1]=R11;
-  cpar[2]=(zch11+2.)*TMath::Tan(accMin);
-  cpar[3]=R11;
-  cpar[4]=cpar[2]+2.*cpar[0]*TMath::Tan(accMin);
+  dz=-(kZvac12-zstart)/2.+(kZRear-zstart)+cpar[0];
+  gMC->Gspos("YCS1", 1, "YMOT", 0., 0., dz, 0, "ONLY");
+
+  cpar[0]=(kZvac4-kZch12)/2.;
+  cpar[1]=kR11;
+  cpar[2]=kZch12*TMath::Tan(kAccMin);
+  cpar[3]=kR11;
+  cpar[4]=(kZch12+2.*cpar[0])*TMath::Tan(kAccMin);
   gMC->Gsvolu("YCS3", "CONE", idtmed[kNiCuW], cpar, 5);
-  dz=(zch11+zch12)/2.;
-  gMC->Gspos("YCS3", 1, "ALIC", 0., 0., dz, 0, "ONLY");
-*/
+  dz=-(kZvac12-zstart)/2.+(kZch12-zstart)+cpar[0];
+  gMC->Gspos("YCS3", 1, "YMOT", 0., 0., dz, 0, "ONLY");
+
+
+// Recess station 1
+
+  cpar[0]=(kZch12-kZch11)/2.;
+  cpar[1]=kR11;
+  cpar[2]=18.;
+  cpar[3]=kR11;
+  cpar[4]=17.9;
+  gMC->Gsvolu("YCS2", "CONE", idtmed[kAir], cpar, 5);
+  dz=-(kZvac12-zstart)/2.+(kZch11-zstart)+cpar[0];
+  gMC->Gspos("YCS2", 1, "YMOT", 0., 0., dz, 0, "ONLY");
+
+  Float_t ptubs[5];
+  ptubs[0] = kR11;
+  ptubs[1] = 17.9;
+  ptubs[2] =   0.;
+// phi_min, phi_max
+  ptubs[3] =   0.;
+  ptubs[4] =  90.;  
+  gMC->Gsvolu("YCR0", "TUBS", idtmed[kNiCuW], ptubs, 0);
+  Int_t idrotm[1799];
+  
+  AliMatrix(idrotm[1701],90.,   0., 90.,  90., 0., 0.);
+  AliMatrix(idrotm[1702],90.,  90., 90., 180., 0., 0.);
+  AliMatrix(idrotm[1703],90., 180., 90., 270., 0., 0.); 
+  AliMatrix(idrotm[1704],90., 270., 90.,   0., 0., 0.); 
+  //  Int_t ipos;
+  
+  dz=-cpar[0];
+// 1.
+  ptubs[2]=6.5/2.;
+  dz+=ptubs[2];
+  gMC->Gsposp("YCR0", 1, "YCS2", 0., 0., dz, idrotm[1701], "ONLY", ptubs, 5);
+  gMC->Gsposp("YCR0", 2, "YCS2", 0., 0., dz, idrotm[1703], "ONLY", ptubs, 5);
+  dz+=ptubs[2];
+  dz+=1.5;
+// 2.
+  ptubs[2]=5.0/2.;
+  dz+=ptubs[2];
+  gMC->Gsposp("YCR0", 3, "YCS2", 0., 0., dz, idrotm[1702], "ONLY", ptubs, 5);
+  gMC->Gsposp("YCR0", 4, "YCS2", 0., 0., dz, idrotm[1704], "ONLY", ptubs, 5);
+  dz+=ptubs[2];
+  dz+=1.5;
+// 3. 
+  ptubs[2]=5.0/2.;
+  dz+=ptubs[2];
+  gMC->Gsposp("YCR0", 5, "YCS2", 0., 0., dz, idrotm[1701], "ONLY", ptubs, 5);
+  gMC->Gsposp("YCR0", 6, "YCS2", 0., 0., dz, idrotm[1703], "ONLY", ptubs, 5);
+  dz+=ptubs[2];
+  dz+=1.5;
+// 4. 
+  ptubs[2]=6.5/2.;
+  dz+=ptubs[2];
+  gMC->Gsposp("YCR0", 7, "YCS2", 0., 0., dz, idrotm[1702], "ONLY", ptubs, 5);
+  gMC->Gsposp("YCR0", 8, "YCS2", 0., 0., dz, idrotm[1704], "ONLY", ptubs, 5);
+  dz+=ptubs[2];
+  dz+=1.5;
+
 
-  cpar[0]=(zch21-zvac4)/2.;
-  cpar[1]=R21;
-  cpar[2]=zvac4*TMath::Tan(accMin);
-  cpar[3]=R21;
-  cpar[4]=(zvac4+2.*cpar[0])*TMath::Tan(accMin);
-  gMC->Gsvolu("YCS4", "CONE", idtmed[kNiCuW], cpar, 5);
-  dz=zvac4+cpar[0];
-  gMC->Gspos("YCS4", 1, "ALIC", 0., 0., dz, 0, "ONLY");
   
-/*
-  cpar[0]=(zvac6-zch22)/2.;
-  cpar[1]=R21;
-  cpar[2]=(zvac6-2.*cpar[0])*TMath::Tan(accMin);
-  cpar[3]=R21;
-  cpar[4]=zvac6*TMath::Tan(accMin);
-  gMC->Gsvolu("YCS5", "CONE", idtmed[kNiCuW], cpar, 5);
-  dz=zvac6-cpar[0];
-  gMC->Gspos("YCS5", 1, "ALIC", 0., 0., dz, 0, "ONLY");
-
-
-  cpar[0]=(zch22-zch21-2.)/2.;
-  cpar[1]=R21;
-  cpar[2]=(zch21+2.)*TMath::Tan(accMin);
-  cpar[3]=R21;
-  cpar[4]=cpar[2]+2.*cpar[0]*TMath::Tan(accMin);
+  cpar[0]=(kZch21-kZvac4)/2.;
+  cpar[1]=kR21;
+  cpar[2]=kZvac4*TMath::Tan(kAccMin);
+  cpar[3]=kR21;
+  cpar[4]=(kZvac4+2.*cpar[0])*TMath::Tan(kAccMin);
+  gMC->Gsvolu("YCS4", "CONE", idtmed[kNiCuW], cpar, 5);
+  dz=-(kZvac12-zstart)/2.+(kZvac4-zstart)+cpar[0];
+  gMC->Gspos("YCS4", 1, "YMOT", 0., 0., dz, 0, "ONLY");
+
+  cpar[0]=(kZvac6-kZch22)/2.;
+  cpar[1]=kR21;
+  cpar[2]=kZch22*TMath::Tan(kAccMin);
+  cpar[3]=kR21;
+  cpar[4]=(kZch22+2.*cpar[0])*TMath::Tan(kAccMin);
   gMC->Gsvolu("YCS6", "CONE", idtmed[kNiCuW], cpar, 5);
-  dz=(zch21+zch22)/2.;
-  gMC->Gspos("YCS6", 1, "ALIC", 0., 0., dz, 0, "ONLY");
-*/
+  dz=-(kZvac12-zstart)/2.+(kZch22-zstart)+cpar[0];
+  gMC->Gspos("YCS6", 1, "YMOT", 0., 0., dz, 0, "ONLY");
+  
+// Recess station 2
+  cpar[0]=(kZch22-kZch21)/2.;
+  cpar[1]=kR21;
+  cpar[2]=23.;
+  cpar[3]=kR21;
+  cpar[4]=23.;
+  gMC->Gsvolu("YCS5", "CONE", idtmed[kAir], cpar, 5);
+  dz=-(kZvac12-zstart)/2.+(kZch21-zstart)+cpar[0];
+  gMC->Gspos("YCS5", 1, "YMOT", 0., 0., dz, 0, "ONLY");
+
+  ptubs[0] = kR21;
+  ptubs[1] = 23;
+  ptubs[2] =   0.;
+  ptubs[3] =   0.;
+  ptubs[4] =  90.;  
+  gMC->Gsvolu("YCR1", "TUBS", idtmed[kNiCuW], ptubs, 0);
+
+  dz=-cpar[0];
+// 1.
+  ptubs[2]=7.5/2.;
+  dz+=ptubs[2];
+  gMC->Gsposp("YCR1", 1, "YCS5", 0., 0., dz, idrotm[1701], "ONLY", ptubs, 5);
+  gMC->Gsposp("YCR1", 2, "YCS5", 0., 0., dz, idrotm[1703], "ONLY", ptubs, 5);
+  dz+=ptubs[2];
+  dz+=1.5;
+// 2.
+  ptubs[2]=6.0/2.;
+  dz+=ptubs[2];
+  gMC->Gsposp("YCR1", 3, "YCS5", 0., 0., dz, idrotm[1702], "ONLY", ptubs, 5);
+  gMC->Gsposp("YCR1", 4, "YCS5", 0., 0., dz, idrotm[1704], "ONLY", ptubs, 5);
+  dz+=ptubs[2];
+  dz+=1.5;
+// 3. 
+  ptubs[2]=6.0/2.;
+  dz+=ptubs[2];
+  gMC->Gsposp("YCR1", 5, "YCS5", 0., 0., dz, idrotm[1701], "ONLY", ptubs, 5);
+  gMC->Gsposp("YCR1", 6, "YCS5", 0., 0., dz, idrotm[1703], "ONLY", ptubs, 5);
+  dz+=ptubs[2];
+  dz+=1.5;
+// 4. 
+  ptubs[2]=7.5/2.;
+  dz+=ptubs[2];
+  gMC->Gsposp("YCR1", 7, "YCS5", 0., 0., dz, idrotm[1702], "ONLY", ptubs, 5);
+  gMC->Gsposp("YCR1", 8, "YCS5", 0., 0., dz, idrotm[1704], "ONLY", ptubs, 5);
+  dz+=ptubs[2];
+  dz+=1.5;
+
 //
 // Outer Pb Cone
-  
-  if (fPbCone) {
 
+  if (fPbCone) {
+      dl = (kZvac10-kZch32)/2.;
+      dz = dl+kZch32;
+      
       par0[0]  = 0.;
       par0[1]  = 360.;
       par0[2]  = 10.;
-/*
-//    start of cone
-      par0[3]  = zConeE;
-      par0[4]  = 30.;
-      par0[5]  = 30.01;
-//    3rd station
-      par0[6]  = zch31;
-      par0[7]  = 30.;
-      par0[8]  = 30.+(zch31-zConeE)*TMath::Tan(thetaOpenPbO);
-
-      par0[9]   = zch31;
-      par0[10]  = 30.0;
-      par0[11]  = par0[8]-1.;
-      
 
-      par0[12]  = zch32;
-      par0[13]  = 30.0;
-      par0[14]  = par0[11];
-*/
-      par0[ 3]  = zch32;
+      par0[ 3]  = -dl;
       par0[ 4]  = 30.;
-      par0[ 5]  = 30.+(zch32-zConeE)*TMath::Tan(thetaOpenPbO);
+      par0[ 5]  = 30.+(kZch32-kZConeE)*TMath::Tan(kThetaOpenPbO);
 
 //    4th station
-      par0[ 6]  = zch41;
+      par0[ 6]  = -dz + kZch41;
       par0[ 7]  = 30.;
-      par0[ 8]  = 30.+(zch41-zConeE)*TMath::Tan(thetaOpenPbO);
+      par0[ 8]  = 30.+(kZch41-kZConeE)*TMath::Tan(kThetaOpenPbO);
 
-      par0[ 9]   = zch41;
+      par0[ 9]  = -dz + kZch41;
       par0[10]  = 30.;
       par0[11]  = 37.5;  
                                           // recess erice2000
-      par0[12]  = zch42;
+      par0[12]  = -dz + kZch42;
       par0[13]  = 30.;
       par0[14]  = par0[11];
 
-      par0[15]  = zch42;
+      par0[15]  = -dz + kZch42;
       par0[16]  = 30.;
-      par0[17]  = 30.+(zch42-zConeE)*TMath::Tan(thetaOpenPbO);
+      par0[17]  = 30.+(kZch42-kZConeE)*TMath::Tan(kThetaOpenPbO);
 
 //    5th station
-      par0[18]  = zch51;
+      par0[18]  = -dz + kZch51;
       par0[19]  = 30.;
-      par0[20]  = 30.+(zch51-zConeE)*TMath::Tan(thetaOpenPbO);
+      par0[20]  = 30.+(kZch51-kZConeE)*TMath::Tan(kThetaOpenPbO);
 
-      par0[21]  = zch51;
+      par0[21]  = -dz + kZch51;
       par0[22]  = 30.;
-      par0[23]  = 37.5;                                            // recess erice2000
+      par0[23]  = 37.5;  // recess erice2000
 
-      par0[24]  = zch52;
+      par0[24]  = -dz + kZch52;
       par0[25]  = 30.;
       par0[26]  = par0[23];
 
-      par0[27]  = zch52;
+      par0[27]  = -dz + kZch52;
       par0[28]  = 30.;
-      par0[29]  = 30.+(zch52-zConeE)*TMath::Tan(thetaOpenPbO);
+      par0[29]  = 30.+(kZch52-kZConeE)*TMath::Tan(kThetaOpenPbO);
 // end of cone
-      par0[30]  = zFilterIn;
+      par0[30]  = +dl;
       par0[31]  = 30.;
       par0[32]  = par0[29];
 //
       gMC->Gsvolu("YOPB", "PCON", idtmed[kPb], par0, 33);
-      dz=0.;
-      gMC->Gspos("YOPB", 1, "ALIC", 0., 0., dz, 0, "ONLY");
+      dz = -(kZvac12-zstart)/2. + (kZch32-zstart) + dl;
+      gMC->Gspos("YOPB", 1, "YMOT", 0., 0., dz, 0, "ONLY");
   }
 }
 
@@ -1182,15 +1197,16 @@ void AliSHILv0::Init()
   //
   Int_t i;
   //
-  if(fDebug) {
-    printf("\n%s: ",ClassName());
-    for(i=0;i<35;i++) printf("*");
-    printf(" SHILv0_INIT ");
-    for(i=0;i<35;i++) printf("*");
-    printf("\n%s: ",ClassName());
-    //
-    // Here the SHIL initialisation code (if any!)
-    for(i=0;i<80;i++) printf("*");
-    printf("\n");
+  
+  if(AliLog::GetGlobalDebugLevel()>0) {
+      printf("\n%s: ",ClassName());
+      for(i=0;i<35;i++) printf("*");
+      printf(" SHILv0_INIT ");
+      for(i=0;i<35;i++) printf("*");
+      printf("\n%s: ",ClassName());
+      //
+      // Here the SHIL initialisation code (if any!)
+      for(i=0;i<80;i++) printf("*");
+      printf("\n");
   }
 }