From 78134e483a734b75e8f6a2811687c2776894bf17 Mon Sep 17 00:00:00 2001
From: kowal2 <kowal2@f7af4fe6-9843-0410-8265-dc069ae4e863>
Date: Fri, 13 Jun 2008 11:52:18 +0000
Subject: [PATCH] Corrected overlaps corrected HV rod updated resistor rod

---
 TPC/AliTPCv0.cxx | 126 +++++++++++++++++++++++++++++++++++-----------
 TPC/AliTPCv1.cxx | 125 +++++++++++++++++++++++++++++++++++-----------
 TPC/AliTPCv2.cxx | 125 +++++++++++++++++++++++++++++++++++-----------
 TPC/AliTPCv3.cxx | 126 +++++++++++++++++++++++++++++++++++-----------
 TPC/AliTPCv4.cxx | 127 +++++++++++++++++++++++++++++++++++------------
 5 files changed, 480 insertions(+), 149 deletions(-)

diff --git a/TPC/AliTPCv0.cxx b/TPC/AliTPCv0.cxx
index b7279088b8b..7442c8e5d5e 100644
--- a/TPC/AliTPCv0.cxx
+++ b/TPC/AliTPCv0.cxx
@@ -99,33 +99,37 @@ void AliTPCv0::CreateGeometry()
   // here I define a volume TPC
   // retrive the medium name with "TPC_" as a leading string
   //
-  TGeoPcon *tpc = new TGeoPcon(0.,360.,18); //18 sections
-  tpc->DefineSection(0,-290.,77.,278.);
-  tpc->DefineSection(1,-259.6,70.,278.);
+  TGeoPcon *tpc = new TGeoPcon(0.,360.,20); //20 sections
   //
-  tpc->DefineSection(2,-259.6,68.1,278.);
-  tpc->DefineSection(3,-253.6,68.1,278.);
+  tpc->DefineSection(0,-291.,77.,278.);
+  tpc->DefineSection(1,-270,77.,278.);
   //
-  tpc->DefineSection(4,-253.6,68.,278.);
-  tpc->DefineSection(5,-74.0,60.8,278.);
+  tpc->DefineSection(2,-270.,77.,278.);
+  tpc->DefineSection(3,-259.6,70.,278.);
   //
-  tpc->DefineSection(6,-74.0,60.1,278.);
-  tpc->DefineSection(7,-73.3,60.1,278.);
+  tpc->DefineSection(4,-259.6,68.1,278.);
+  tpc->DefineSection(5,-253.6,68.1,278.);
   //
-  tpc->DefineSection(8,-73.3,56.9,278.); 
-  tpc->DefineSection(9,73.3,56.9,278.);
+  tpc->DefineSection(6,-253.6,68.,278.);
+  tpc->DefineSection(7,-74.0,60.8,278.);
   //
-  tpc->DefineSection(10,73.3,60.1,278.);
-  tpc->DefineSection(11,74.0,60.1,278.);
+  tpc->DefineSection(8,-74.0,60.1,278.);
+  tpc->DefineSection(9,-73.3,60.1,278.);
   //
-  tpc->DefineSection(12,74.0,60.8,278.);
-  tpc->DefineSection(13,253.6,65.5,278.);
+  tpc->DefineSection(10,-73.3,56.9,278.); 
+  tpc->DefineSection(11,73.3,56.9,278.);
   //
-  tpc->DefineSection(14,253.6,65.6,278.);
-  tpc->DefineSection(15,259.6,65.6,278.);
+  tpc->DefineSection(12,73.3,60.1,278.);
+  tpc->DefineSection(13,74.0,60.1,278.);
   //
-  tpc->DefineSection(16,259.6,70.0,278.);
-  tpc->DefineSection(17,290.,77.,278.);
+  tpc->DefineSection(14,74.0,60.8,278.);
+  tpc->DefineSection(15,253.6,65.5,278.);
+  //
+  tpc->DefineSection(16,253.6,65.6,278.);
+  tpc->DefineSection(17,259.6,65.6,278.);
+  //
+  tpc->DefineSection(18,259.6,70.0,278.);
+  tpc->DefineSection(19,291.,77.,278.);
   //
   TGeoMedium *m1 = gGeoManager->GetMedium("TPC_Air");
   TGeoVolume *v1 = new TGeoVolume("TPC_M",tpc,m1);
@@ -388,8 +392,8 @@ void AliTPCv0::CreateGeometry()
   TGeoTube *cs = new TGeoTube(56.9,61.2,0.1);
   TGeoMedium *sm7 = gGeoManager->GetMedium("TPC_Mylar");
   TGeoVolume *csv = new TGeoVolume("TPC_CDRS",cs,sm7);
-  v1->AddNode(csv,1,new TGeoTranslation(0.,0.,-71.));
-  v1->AddNode(csv,2,new TGeoTranslation(0.,0.,71.));
+  v1->AddNode(csv,1,new TGeoTranslation(0.,0.,-71.2));
+  v1->AddNode(csv,2,new TGeoTranslation(0.,0.,71.2));
   //
   // seal collars 
   TGeoPcon *se = new TGeoPcon(0.,360.,6);
@@ -787,6 +791,9 @@ void AliTPCv0::CreateGeometry()
   //----------------------------------------------------------
   TGeoMedium *m6=gGeoManager->GetMedium("TPC_Makrolon");
   TGeoMedium *m7=gGeoManager->GetMedium("TPC_Cu");
+  TGeoMedium *m10 =  gGeoManager->GetMedium("TPC_Alumina");
+  TGeoMedium *m11 =  gGeoManager->GetMedium("TPC_Peek");
+  TGeoMedium *m12 =  gGeoManager->GetMedium("TPC_Water");
   // upper and lower rods differ in length!
   Double_t *upar;
   upar=NULL;
@@ -803,6 +810,49 @@ void AliTPCv0::CreateGeometry()
   TGeoVolume *hvrv = new TGeoVolume("TPC_HV_Rod",hvr,m6);
   TGeoVolume *hvcv = new TGeoVolume("TPC_HV_Cable",hvc,m7);
   hvrv->AddNode(hvcv,1);
+  //
+  // resistor rods
+  //
+  TGeoTube *cri = new TGeoTube(0.,0.45,126.64); //inner 
+  TGeoTube *cro = new TGeoTube(0.,0.45,126.54); //outer 
+  TGeoTube *cwi = new TGeoTube(0.,0.15,126.64); // water inner
+  TGeoTube *cwo = new TGeoTube(0.,0.15,126.54); // water outer
+  //
+  TGeoVolume *criv = new TGeoVolume("TPC_CR_I",cri,m10);
+  TGeoVolume *crov = new TGeoVolume("TPC_CR_O",cro,m10);    
+  TGeoVolume *cwiv = new TGeoVolume("TPC_W_I",cwi,m11);
+  TGeoVolume *cwov = new TGeoVolume("TPC_W_O",cwo,m11);   
+  //
+  // ceramic rod with water
+  //
+  criv->AddNode(cwiv,1); 
+  crov->AddNode(cwov,1);
+  //
+  TGeoTube *pri =new TGeoTube(0.2,0.35,126.64); //inner 
+  TGeoTube *pro = new TGeoTube(0.2,0.35,126.54); //outer    
+  //
+  // peek rod
+  //
+  TGeoVolume *priv = new TGeoVolume("TPC_PR_I",pri,m12);
+  TGeoVolume *prov = new TGeoVolume("TPC_PR_O",pro,m12);
+  //
+  // resistor rods assembly
+  //
+   TGeoRotation rotr("rotr");
+   rotr.RotateZ(-21.);
+  TGeoTube *rri = new TGeoTube(1.8,2.2,126.64);//inner
+  TGeoTube *rro = new TGeoTube(1.8,2.2,126.54);//inner
+  //
+  TGeoVolume *rriv = new TGeoVolume("TPC_RR_I",rri,m6);
+  TGeoVolume *rrov = new TGeoVolume("TPC_RR_O",rro,m6);  
+  //
+  rrov->AddNode(crov,1,new TGeoCombiTrans(0.5,0.866,0.,&rotr));
+  rrov->AddNode(crov,2,new TGeoCombiTrans(0.5,-0.866,0.,&rotr));
+  rrov->AddNode(prov,1);
+  //
+  rriv->AddNode(criv,1,new TGeoCombiTrans(0.5,0.866,0.,&rotr));
+  rriv->AddNode(criv,2,new TGeoCombiTrans(0.5,-0.866,0.,&rotr));
+  rriv->AddNode(priv,1); 
   for(Int_t i=0;i<18;i++){
     Double_t angle,x,y;
     Double_t z,r; 
@@ -812,21 +862,37 @@ void AliTPCv0::CreateGeometry()
     y=r * TMath::Sin(angle);
     upar[2]=126.64; //lower
     z= 126.96;
-    if(i==15){
-      v9->AddNode(hvrv,1,new TGeoTranslation(x,y,z));
-      v9->AddNode(hvrv,2,new TGeoTranslation(x,y,-z));
-    }
-    else{
-     gGeoManager->Node("TPC_Rod",i+1,"TPC_Drift",x,y,z,0,kTRUE,upar,3);//shaft
-     gGeoManager->Node("TPC_Rod",i+18,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);//muon
+    if(i==3){
+      v9->AddNode(rriv,1,new TGeoTranslation(x,y,z)); //A
+      v9->AddNode(rriv,2,new TGeoTranslation(x,y,-z)); //C      
+    } 
+    else { 
+      gGeoManager->Node("TPC_Rod",i+1,"TPC_Drift",x,y,z,0,kTRUE,upar,3);//shaft
+      gGeoManager->Node("TPC_Rod",i+19,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);//muon
     }
+
+
+    //
     r=254.25;
     x=r * TMath::Cos(angle);
     y=r * TMath::Sin(angle);
     upar[2]=126.54; //upper
     z=127.06;
-    gGeoManager->Node("TPC_Rod",i+36,"TPC_Drift",x,y,z,0,kTRUE,upar,3);
-    gGeoManager->Node("TPC_Rod",i+54,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
+    //
+    if(i==15){
+      v9->AddNode(hvrv,1,new TGeoTranslation(x,y,z));//A-side only
+      gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
+    }
+    else if(i==11){
+      v9->AddNode(rrov,1,new TGeoTranslation(x,y,z)); //A
+      v9->AddNode(rrov,2,new TGeoTranslation(x,y,-z)); //C
+    }
+    else{
+    //
+      gGeoManager->Node("TPC_Rod",i+37,"TPC_Drift",x,y,z,0,kTRUE,upar,3);
+      gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
+    }
+
   }
 
   TGeoVolume *alice = gGeoManager->GetVolume("ALIC");
diff --git a/TPC/AliTPCv1.cxx b/TPC/AliTPCv1.cxx
index b7603c817a0..802acdf6552 100644
--- a/TPC/AliTPCv1.cxx
+++ b/TPC/AliTPCv1.cxx
@@ -116,33 +116,37 @@ void AliTPCv1::CreateGeometry()
   // here I define a volume TPC
   // retrive the medium name with "TPC_" as a leading string
   //
-  TGeoPcon *tpc = new TGeoPcon(0.,360.,18); //18 sections
-  tpc->DefineSection(0,-290.,77.,278.);
-  tpc->DefineSection(1,-259.6,70.,278.);
+  TGeoPcon *tpc = new TGeoPcon(0.,360.,20); //20 sections
   //
-  tpc->DefineSection(2,-259.6,68.1,278.);
-  tpc->DefineSection(3,-253.6,68.1,278.);
+  tpc->DefineSection(0,-291.,77.,278.);
+  tpc->DefineSection(1,-270,77.,278.);
   //
-  tpc->DefineSection(4,-253.6,68.,278.);
-  tpc->DefineSection(5,-74.0,60.8,278.);
+  tpc->DefineSection(2,-270.,77.,278.);
+  tpc->DefineSection(3,-259.6,70.,278.);
   //
-  tpc->DefineSection(6,-74.0,60.1,278.);
-  tpc->DefineSection(7,-73.3,60.1,278.);
+  tpc->DefineSection(4,-259.6,68.1,278.);
+  tpc->DefineSection(5,-253.6,68.1,278.);
   //
-  tpc->DefineSection(8,-73.3,56.9,278.); 
-  tpc->DefineSection(9,73.3,56.9,278.);
+  tpc->DefineSection(6,-253.6,68.,278.);
+  tpc->DefineSection(7,-74.0,60.8,278.);
   //
-  tpc->DefineSection(10,73.3,60.1,278.);
-  tpc->DefineSection(11,74.0,60.1,278.);
+  tpc->DefineSection(8,-74.0,60.1,278.);
+  tpc->DefineSection(9,-73.3,60.1,278.);
   //
-  tpc->DefineSection(12,74.0,60.8,278.);
-  tpc->DefineSection(13,253.6,65.5,278.);
+  tpc->DefineSection(10,-73.3,56.9,278.); 
+  tpc->DefineSection(11,73.3,56.9,278.);
   //
-  tpc->DefineSection(14,253.6,65.6,278.);
-  tpc->DefineSection(15,259.6,65.6,278.);
+  tpc->DefineSection(12,73.3,60.1,278.);
+  tpc->DefineSection(13,74.0,60.1,278.);
   //
-  tpc->DefineSection(16,259.6,70.0,278.);
-  tpc->DefineSection(17,290.,77.,278.);
+  tpc->DefineSection(14,74.0,60.8,278.);
+  tpc->DefineSection(15,253.6,65.5,278.);
+  //
+  tpc->DefineSection(16,253.6,65.6,278.);
+  tpc->DefineSection(17,259.6,65.6,278.);
+  //
+  tpc->DefineSection(18,259.6,70.0,278.);
+  tpc->DefineSection(19,291.,77.,278.);
   //
   TGeoMedium *m1 = gGeoManager->GetMedium("TPC_Air");
   TGeoVolume *v1 = new TGeoVolume("TPC_M",tpc,m1);
@@ -406,8 +410,8 @@ void AliTPCv1::CreateGeometry()
   TGeoTube *cs = new TGeoTube(56.9,61.2,0.1);
   TGeoMedium *sm7 = gGeoManager->GetMedium("TPC_Mylar");
   TGeoVolume *csv = new TGeoVolume("TPC_CDRS",cs,sm7);
-  v1->AddNode(csv,1,new TGeoTranslation(0.,0.,-71.));
-  v1->AddNode(csv,2,new TGeoTranslation(0.,0.,71.));
+  v1->AddNode(csv,1,new TGeoTranslation(0.,0.,-71.2));
+  v1->AddNode(csv,2,new TGeoTranslation(0.,0.,71.2));
   //
   // seal collars 
   TGeoPcon *se = new TGeoPcon(0.,360.,6);
@@ -859,6 +863,9 @@ void AliTPCv1::CreateGeometry()
   //----------------------------------------------------------
   TGeoMedium *m6=gGeoManager->GetMedium("TPC_Makrolon");
   TGeoMedium *m7=gGeoManager->GetMedium("TPC_Cu");
+  TGeoMedium *m10 =  gGeoManager->GetMedium("TPC_Alumina");
+  TGeoMedium *m11 =  gGeoManager->GetMedium("TPC_Peek");
+  TGeoMedium *m12 =  gGeoManager->GetMedium("TPC_Water");
   // upper and lower rods differ in length!
   delete [] upar;
   upar=NULL;
@@ -875,7 +882,51 @@ void AliTPCv1::CreateGeometry()
   TGeoVolume *hvrv = new TGeoVolume("TPC_HV_Rod",hvr,m6);
   TGeoVolume *hvcv = new TGeoVolume("TPC_HV_Cable",hvc,m7);
   hvrv->AddNode(hvcv,1);
-  
+  //
+  // resistor rods
+  //
+  TGeoTube *cri = new TGeoTube(0.,0.45,126.64); //inner 
+  TGeoTube *cro = new TGeoTube(0.,0.45,126.54); //outer 
+  TGeoTube *cwi = new TGeoTube(0.,0.15,126.64); // water inner
+  TGeoTube *cwo = new TGeoTube(0.,0.15,126.54); // water outer
+  //
+  TGeoVolume *criv = new TGeoVolume("TPC_CR_I",cri,m10);
+  TGeoVolume *crov = new TGeoVolume("TPC_CR_O",cro,m10);    
+  TGeoVolume *cwiv = new TGeoVolume("TPC_W_I",cwi,m11);
+  TGeoVolume *cwov = new TGeoVolume("TPC_W_O",cwo,m11);   
+  //
+  // ceramic rod with water
+  //
+  criv->AddNode(cwiv,1); 
+  crov->AddNode(cwov,1);
+  //
+  TGeoTube *pri =new TGeoTube(0.2,0.35,126.64); //inner 
+  TGeoTube *pro = new TGeoTube(0.2,0.35,126.54); //outer    
+  //
+  // peek rod
+  //
+  TGeoVolume *priv = new TGeoVolume("TPC_PR_I",pri,m12);
+  TGeoVolume *prov = new TGeoVolume("TPC_PR_O",pro,m12); 
+  //
+  // resistor rods assembly
+  //
+   TGeoRotation rotr("rotr");
+   rotr.RotateZ(-21.);
+  //
+  TGeoTube *rri = new TGeoTube(1.8,2.2,126.64);//inner
+  TGeoTube *rro = new TGeoTube(1.8,2.2,126.54);//inner
+  //
+  TGeoVolume *rriv = new TGeoVolume("TPC_RR_I",rri,m6);
+  TGeoVolume *rrov = new TGeoVolume("TPC_RR_O",rro,m6);  
+  //
+  //
+  rrov->AddNode(crov,1,new TGeoCombiTrans(0.5,0.866,0.,&rotr));
+  rrov->AddNode(crov,2,new TGeoCombiTrans(0.5,-0.866,0.,&rotr));
+  rrov->AddNode(prov,1);
+  //
+  rriv->AddNode(criv,1,new TGeoCombiTrans(0.5,0.866,0.,&rotr));
+  rriv->AddNode(criv,2,new TGeoCombiTrans(0.5,-0.866,0.,&rotr));
+  rriv->AddNode(priv,1);     
   for(Int_t i=0;i<18;i++){
     Double_t angle,x,y;
     Double_t z,r; 
@@ -885,19 +936,35 @@ void AliTPCv1::CreateGeometry()
     y=r * TMath::Sin(angle);
     upar[2]=126.64; //lower
     z= 126.96;
-    if(i==15){
-      v9->AddNode(hvrv,1,new TGeoTranslation(x,y,z));
-      v9->AddNode(hvrv,2,new TGeoTranslation(x,y,-z));
-    }
-    else{
-     gGeoManager->Node("TPC_Rod",i+1,"TPC_Drift",x,y,z,0,kTRUE,upar,3);//shaft
-     gGeoManager->Node("TPC_Rod",i+18,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);//muon
+    if(i==3){
+      v9->AddNode(rriv,1,new TGeoTranslation(x,y,z)); //A
+      v9->AddNode(rriv,2,new TGeoTranslation(x,y,-z)); //C      
+    } 
+    else { 
+      gGeoManager->Node("TPC_Rod",i+1,"TPC_Drift",x,y,z,0,kTRUE,upar,3);//shaft
+      gGeoManager->Node("TPC_Rod",i+19,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);//muon
     }
+
+    //
     r=254.25;
     x=r * TMath::Cos(angle);
     y=r * TMath::Sin(angle);
     upar[2]=126.54; //upper
     z=127.06;
+    //
+    if(i==15){
+      v9->AddNode(hvrv,1,new TGeoTranslation(x,y,z));//A-side only
+      gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
+    }
+    else if(i==11){
+      v9->AddNode(rrov,1,new TGeoTranslation(x,y,z)); //A
+      v9->AddNode(rrov,2,new TGeoTranslation(x,y,-z)); //C
+    }
+    else{
+    //
+      gGeoManager->Node("TPC_Rod",i+37,"TPC_Drift",x,y,z,0,kTRUE,upar,3);
+      gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
+    }
     gGeoManager->Node("TPC_Rod",i+36,"TPC_Drift",x,y,z,0,kTRUE,upar,3);
     gGeoManager->Node("TPC_Rod",i+54,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
   }
diff --git a/TPC/AliTPCv2.cxx b/TPC/AliTPCv2.cxx
index 8a06644f2a3..133771289d5 100644
--- a/TPC/AliTPCv2.cxx
+++ b/TPC/AliTPCv2.cxx
@@ -100,33 +100,37 @@ void AliTPCv2::CreateGeometry()
   // here I define a volume TPC
   // retrive the medium name with "TPC_" as a leading string
   //
-  TGeoPcon *tpc = new TGeoPcon(0.,360.,18); //18 sections
-  tpc->DefineSection(0,-290.,77.,278.);
-  tpc->DefineSection(1,-259.6,70.,278.);
+  TGeoPcon *tpc = new TGeoPcon(0.,360.,20); //20 sections
   //
-  tpc->DefineSection(2,-259.6,68.1,278.);
-  tpc->DefineSection(3,-253.6,68.1,278.);
+  tpc->DefineSection(0,-291.,77.,278.);
+  tpc->DefineSection(1,-270,77.,278.);
   //
-  tpc->DefineSection(4,-253.6,68.,278.);
-  tpc->DefineSection(5,-74.0,60.8,278.);
+  tpc->DefineSection(2,-270.,77.,278.);
+  tpc->DefineSection(3,-259.6,70.,278.);
   //
-  tpc->DefineSection(6,-74.0,60.1,278.);
-  tpc->DefineSection(7,-73.3,60.1,278.);
+  tpc->DefineSection(4,-259.6,68.1,278.);
+  tpc->DefineSection(5,-253.6,68.1,278.);
   //
-  tpc->DefineSection(8,-73.3,56.9,278.); 
-  tpc->DefineSection(9,73.3,56.9,278.);
+  tpc->DefineSection(6,-253.6,68.,278.);
+  tpc->DefineSection(7,-74.0,60.8,278.);
   //
-  tpc->DefineSection(10,73.3,60.1,278.);
-  tpc->DefineSection(11,74.0,60.1,278.);
+  tpc->DefineSection(8,-74.0,60.1,278.);
+  tpc->DefineSection(9,-73.3,60.1,278.);
   //
-  tpc->DefineSection(12,74.0,60.8,278.);
-  tpc->DefineSection(13,253.6,65.5,278.);
+  tpc->DefineSection(10,-73.3,56.9,278.); 
+  tpc->DefineSection(11,73.3,56.9,278.);
   //
-  tpc->DefineSection(14,253.6,65.6,278.);
-  tpc->DefineSection(15,259.6,65.6,278.);
+  tpc->DefineSection(12,73.3,60.1,278.);
+  tpc->DefineSection(13,74.0,60.1,278.);
   //
-  tpc->DefineSection(16,259.6,70.0,278.);
-  tpc->DefineSection(17,290.,77.,278.);
+  tpc->DefineSection(14,74.0,60.8,278.);
+  tpc->DefineSection(15,253.6,65.5,278.);
+  //
+  tpc->DefineSection(16,253.6,65.6,278.);
+  tpc->DefineSection(17,259.6,65.6,278.);
+  //
+  tpc->DefineSection(18,259.6,70.0,278.);
+  tpc->DefineSection(19,291.,77.,278.);
   //
   TGeoMedium *m1 = gGeoManager->GetMedium("TPC_Air");
   TGeoVolume *v1 = new TGeoVolume("TPC_M",tpc,m1);
@@ -843,6 +847,9 @@ void AliTPCv2::CreateGeometry()
   //----------------------------------------------------------
   TGeoMedium *m6=gGeoManager->GetMedium("TPC_Makrolon");
   TGeoMedium *m7=gGeoManager->GetMedium("TPC_Cu");
+  TGeoMedium *m10 =  gGeoManager->GetMedium("TPC_Alumina");
+  TGeoMedium *m11 =  gGeoManager->GetMedium("TPC_Peek");
+  TGeoMedium *m12 =  gGeoManager->GetMedium("TPC_Water");
   // upper and lower rods differ in length!
   delete [] upar;
   upar=NULL;
@@ -859,7 +866,51 @@ void AliTPCv2::CreateGeometry()
   TGeoVolume *hvrv = new TGeoVolume("TPC_HV_Rod",hvr,m6);
   TGeoVolume *hvcv = new TGeoVolume("TPC_HV_Cable",hvc,m7);
   hvrv->AddNode(hvcv,1);
-  
+  //
+  // resistor rods
+  //
+  TGeoTube *cri = new TGeoTube(0.,0.45,126.64); //inner 
+  TGeoTube *cro = new TGeoTube(0.,0.45,126.54); //outer 
+  TGeoTube *cwi = new TGeoTube(0.,0.15,126.64); // water inner
+  TGeoTube *cwo = new TGeoTube(0.,0.15,126.54); // water outer
+  //
+  TGeoVolume *criv = new TGeoVolume("TPC_CR_I",cri,m10);
+  TGeoVolume *crov = new TGeoVolume("TPC_CR_O",cro,m10);    
+  TGeoVolume *cwiv = new TGeoVolume("TPC_W_I",cwi,m11);
+  TGeoVolume *cwov = new TGeoVolume("TPC_W_O",cwo,m11);   
+  //
+  // ceramic rod with water
+  //
+  criv->AddNode(cwiv,1); 
+  crov->AddNode(cwov,1);
+  //
+  TGeoTube *pri =new TGeoTube(0.2,0.35,126.64); //inner 
+  TGeoTube *pro = new TGeoTube(0.2,0.35,126.54); //outer    
+  //
+  // peek rod
+  //
+  TGeoVolume *priv = new TGeoVolume("TPC_PR_I",pri,m12);
+  TGeoVolume *prov = new TGeoVolume("TPC_PR_O",pro,m12); 
+  //
+  // resistor rods assembly
+  //
+   TGeoRotation rotr("rotr");
+   rotr.RotateZ(-21.);
+  //
+  TGeoTube *rri = new TGeoTube(1.8,2.2,126.64);//inner
+  TGeoTube *rro = new TGeoTube(1.8,2.2,126.54);//inner
+  //
+  TGeoVolume *rriv = new TGeoVolume("TPC_RR_I",rri,m6);
+  TGeoVolume *rrov = new TGeoVolume("TPC_RR_O",rro,m6);  
+  //
+  //
+  rrov->AddNode(crov,1,new TGeoCombiTrans(0.5,0.866, 0.,&rotr));
+  rrov->AddNode(crov,2,new TGeoCombiTrans(0.5,-0.866,0.,&rotr));
+  rrov->AddNode(prov,1);
+  //
+  rriv->AddNode(criv,1,new TGeoCombiTrans(0.5,0.866,0.,&rotr));
+  rriv->AddNode(criv,2,new TGeoCombiTrans(0.5,-0.866,0.,&rotr));
+  rriv->AddNode(priv,1); 
   for(Int_t i=0;i<18;i++){
     Double_t angle,x,y;
     Double_t z,r; 
@@ -869,21 +920,37 @@ void AliTPCv2::CreateGeometry()
     y=r * TMath::Sin(angle);
     upar[2]=126.64; //lower
     z= 126.96;
-    if(i==15){
-      v9->AddNode(hvrv,1,new TGeoTranslation(x,y,z));
-      v9->AddNode(hvrv,2,new TGeoTranslation(x,y,-z));
-    }
-    else{
-     gGeoManager->Node("TPC_Rod",i+1,"TPC_Drift",x,y,z,0,kTRUE,upar,3);//shaft
-     gGeoManager->Node("TPC_Rod",i+19,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);//muon
+    //
+    if(i==3){
+      v9->AddNode(rriv,1,new TGeoTranslation(x,y,z)); //A
+      v9->AddNode(rriv,2,new TGeoTranslation(x,y,-z)); //C      
+    } 
+    else { 
+      gGeoManager->Node("TPC_Rod",i+1,"TPC_Drift",x,y,z,0,kTRUE,upar,3);//shaft
+      gGeoManager->Node("TPC_Rod",i+19,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);//muon
     }
+   
+
+    //
     r=254.25;
     x=r * TMath::Cos(angle);
     y=r * TMath::Sin(angle);
     upar[2]=126.54; //upper
     z=127.06;
-    gGeoManager->Node("TPC_Rod",i+37,"TPC_Drift",x,y,z,0,kTRUE,upar,3);
-    gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
+    //
+    if(i==15){
+      v9->AddNode(hvrv,1,new TGeoTranslation(x,y,z));//A-side only
+      gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
+    }
+    else if(i==11){
+      v9->AddNode(rrov,1,new TGeoTranslation(x,y,z)); //A
+      v9->AddNode(rrov,2,new TGeoTranslation(x,y,-z)); //C
+    }
+    else{
+    //
+      gGeoManager->Node("TPC_Rod",i+37,"TPC_Drift",x,y,z,0,kTRUE,upar,3);
+      gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
+    }
   }
 
   delete [] upar;
diff --git a/TPC/AliTPCv3.cxx b/TPC/AliTPCv3.cxx
index 9c64a8d51b9..c3e08c0044f 100644
--- a/TPC/AliTPCv3.cxx
+++ b/TPC/AliTPCv3.cxx
@@ -113,33 +113,37 @@ void AliTPCv3::CreateGeometry()
   // here I define a volume TPC
   // retrive the medium name with "TPC_" as a leading string
   //
-  TGeoPcon *tpc = new TGeoPcon(0.,360.,18); //18 sections
-  tpc->DefineSection(0,-290.,77.,278.);
-  tpc->DefineSection(1,-259.6,70.,278.);
+  TGeoPcon *tpc = new TGeoPcon(0.,360.,20); //20 sections
   //
-  tpc->DefineSection(2,-259.6,68.1,278.);
-  tpc->DefineSection(3,-253.6,68.1,278.);
+  tpc->DefineSection(0,-291.,77.,278.);
+  tpc->DefineSection(1,-270,77.,278.);
   //
-  tpc->DefineSection(4,-253.6,68.,278.);
-  tpc->DefineSection(5,-74.0,60.8,278.);
+  tpc->DefineSection(2,-270.,77.,278.);
+  tpc->DefineSection(3,-259.6,70.,278.);
   //
-  tpc->DefineSection(6,-74.0,60.1,278.);
-  tpc->DefineSection(7,-73.3,60.1,278.);
+  tpc->DefineSection(4,-259.6,68.1,278.);
+  tpc->DefineSection(5,-253.6,68.1,278.);
   //
-  tpc->DefineSection(8,-73.3,56.9,278.); 
-  tpc->DefineSection(9,73.3,56.9,278.);
+  tpc->DefineSection(6,-253.6,68.,278.);
+  tpc->DefineSection(7,-74.0,60.8,278.);
   //
-  tpc->DefineSection(10,73.3,60.1,278.);
-  tpc->DefineSection(11,74.0,60.1,278.);
+  tpc->DefineSection(8,-74.0,60.1,278.);
+  tpc->DefineSection(9,-73.3,60.1,278.);
   //
-  tpc->DefineSection(12,74.0,60.8,278.);
-  tpc->DefineSection(13,253.6,65.5,278.);
+  tpc->DefineSection(10,-73.3,56.9,278.); 
+  tpc->DefineSection(11,73.3,56.9,278.);
   //
-  tpc->DefineSection(14,253.6,65.6,278.);
-  tpc->DefineSection(15,259.6,65.6,278.);
+  tpc->DefineSection(12,73.3,60.1,278.);
+  tpc->DefineSection(13,74.0,60.1,278.);
   //
-  tpc->DefineSection(16,259.6,70.0,278.);
-  tpc->DefineSection(17,290.,77.,278.);
+  tpc->DefineSection(14,74.0,60.8,278.);
+  tpc->DefineSection(15,253.6,65.5,278.);
+  //
+  tpc->DefineSection(16,253.6,65.6,278.);
+  tpc->DefineSection(17,259.6,65.6,278.);
+  //
+  tpc->DefineSection(18,259.6,70.0,278.);
+  tpc->DefineSection(19,291.,77.,278.);
   //
   TGeoMedium *m1 = gGeoManager->GetMedium("TPC_Air");
   TGeoVolume *v1 = new TGeoVolume("TPC_M",tpc,m1);
@@ -409,8 +413,8 @@ void AliTPCv3::CreateGeometry()
   TGeoTube *cs = new TGeoTube(56.9,61.2,0.1);
   TGeoMedium *sm7 = gGeoManager->GetMedium("TPC_Mylar");
   TGeoVolume *csv = new TGeoVolume("TPC_CDRS",cs,sm7);
-  v1->AddNode(csv,1,new TGeoTranslation(0.,0.,-71.));
-  v1->AddNode(csv,2,new TGeoTranslation(0.,0.,71.));
+  v1->AddNode(csv,1,new TGeoTranslation(0.,0.,-71.2));
+  v1->AddNode(csv,2,new TGeoTranslation(0.,0.,71.2));
   //
   // seal collars 
   TGeoPcon *se = new TGeoPcon(0.,360.,6);
@@ -807,6 +811,9 @@ void AliTPCv3::CreateGeometry()
   //----------------------------------------------------------
   TGeoMedium *m6=gGeoManager->GetMedium("TPC_Makrolon");
   TGeoMedium *m7=gGeoManager->GetMedium("TPC_Cu");
+  TGeoMedium *m10 =  gGeoManager->GetMedium("TPC_Alumina");
+  TGeoMedium *m11 =  gGeoManager->GetMedium("TPC_Peek");
+  TGeoMedium *m12 =  gGeoManager->GetMedium("TPC_Water");
   // upper and lower rods differ in length!
   Double_t *upar;
   upar=NULL;
@@ -823,6 +830,50 @@ void AliTPCv3::CreateGeometry()
   TGeoVolume *hvrv = new TGeoVolume("TPC_HV_Rod",hvr,m6);
   TGeoVolume *hvcv = new TGeoVolume("TPC_HV_Cable",hvc,m7);
   hvrv->AddNode(hvcv,1);
+  //
+  // resistor rods
+  //
+  TGeoTube *cri = new TGeoTube(0.,0.45,126.64); //inner 
+  TGeoTube *cro = new TGeoTube(0.,0.45,126.54); //outer 
+  TGeoTube *cwi = new TGeoTube(0.,0.15,126.64); // water inner
+  TGeoTube *cwo = new TGeoTube(0.,0.15,126.54); // water outer
+  //
+  TGeoVolume *criv = new TGeoVolume("TPC_CR_I",cri,m10);
+  TGeoVolume *crov = new TGeoVolume("TPC_CR_O",cro,m10);    
+  TGeoVolume *cwiv = new TGeoVolume("TPC_W_I",cwi,m11);
+  TGeoVolume *cwov = new TGeoVolume("TPC_W_O",cwo,m11);   
+  //
+  // ceramic rod with water
+  //
+  criv->AddNode(cwiv,1); 
+  crov->AddNode(cwov,1);
+  //
+  TGeoTube *pri =new TGeoTube(0.2,0.35,126.64); //inner 
+  TGeoTube *pro = new TGeoTube(0.2,0.35,126.54); //outer    
+  //
+  // peek rod
+  //
+  TGeoVolume *priv = new TGeoVolume("TPC_PR_I",pri,m12);
+  TGeoVolume *prov = new TGeoVolume("TPC_PR_O",pro,m12); 
+  //
+  // resistor rods assembly
+  //
+   TGeoRotation rotr("rotr");
+   rotr.RotateZ(-21.);
+  //
+  TGeoTube *rri = new TGeoTube(1.8,2.2,126.64);//inner
+  TGeoTube *rro = new TGeoTube(1.8,2.2,126.54);//inner
+  //
+  TGeoVolume *rriv = new TGeoVolume("TPC_RR_I",rri,m6);
+  TGeoVolume *rrov = new TGeoVolume("TPC_RR_O",rro,m6);  
+  //
+  rrov->AddNode(crov,1,new TGeoCombiTrans(0.5,0.866,0.,&rotr));
+  rrov->AddNode(crov,2,new TGeoCombiTrans(0.5,-0.866,0.,&rotr));
+  rrov->AddNode(prov,1);
+  //
+  rriv->AddNode(criv,1,new TGeoCombiTrans(0.5,0.866,0.,&rotr));
+  rriv->AddNode(criv,2,new TGeoCombiTrans(0.5,-0.866,0.,&rotr));
+  rriv->AddNode(priv,1); 
   for(Int_t i=0;i<18;i++){
     Double_t angle,x,y;
     Double_t z,r; 
@@ -832,21 +883,36 @@ void AliTPCv3::CreateGeometry()
     y=r * TMath::Sin(angle);
     upar[2]=126.64; //lower
     z= 126.96;
-    if(i==15){
-      v9->AddNode(hvrv,1,new TGeoTranslation(x,y,z));
-      v9->AddNode(hvrv,2,new TGeoTranslation(x,y,-z));
-    }
-    else{
-     gGeoManager->Node("TPC_Rod",i+1,"TPC_Drift",x,y,z,0,kTRUE,upar,3);//shaft
-     gGeoManager->Node("TPC_Rod",i+18,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);//muon
+    //
+    if(i==3){
+      v9->AddNode(rriv,1,new TGeoTranslation(x,y,z)); //A
+      v9->AddNode(rriv,2,new TGeoTranslation(x,y,-z)); //C      
+    } 
+    else { 
+      gGeoManager->Node("TPC_Rod",i+1,"TPC_Drift",x,y,z,0,kTRUE,upar,3);//shaft
+      gGeoManager->Node("TPC_Rod",i+19,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);//muon
     }
+   
+
+    //
     r=254.25;
     x=r * TMath::Cos(angle);
     y=r * TMath::Sin(angle);
     upar[2]=126.54; //upper
     z=127.06;
-    gGeoManager->Node("TPC_Rod",i+36,"TPC_Drift",x,y,z,0,kTRUE,upar,3);
-    gGeoManager->Node("TPC_Rod",i+54,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
+    if(i==15){
+      v9->AddNode(hvrv,1,new TGeoTranslation(x,y,z));//A-side only
+      gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
+    }
+    else if(i==11){
+      v9->AddNode(rrov,1,new TGeoTranslation(x,y,z)); //A
+      v9->AddNode(rrov,2,new TGeoTranslation(x,y,-z)); //C
+    }
+    else{
+    //
+      gGeoManager->Node("TPC_Rod",i+37,"TPC_Drift",x,y,z,0,kTRUE,upar,3);
+      gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
+    }
   }
 
   TGeoVolume *alice = gGeoManager->GetVolume("ALIC");
diff --git a/TPC/AliTPCv4.cxx b/TPC/AliTPCv4.cxx
index 73a321a1e37..b8c99a6a1b0 100644
--- a/TPC/AliTPCv4.cxx
+++ b/TPC/AliTPCv4.cxx
@@ -104,33 +104,37 @@ void AliTPCv4::CreateGeometry()
   // here I define a volume TPC
   // retrive the medium name with "TPC_" as a leading string
   //
-  TGeoPcon *tpc = new TGeoPcon(0.,360.,18); //18 sections
-  tpc->DefineSection(0,-290.,77.,278.);
-  tpc->DefineSection(1,-259.6,70.,278.);
+  TGeoPcon *tpc = new TGeoPcon(0.,360.,20); //20 sections
   //
-  tpc->DefineSection(2,-259.6,68.1,278.);
-  tpc->DefineSection(3,-253.6,68.1,278.);
+  tpc->DefineSection(0,-291.,77.,278.);
+  tpc->DefineSection(1,-270,77.,278.);
   //
-  tpc->DefineSection(4,-253.6,68.,278.);
-  tpc->DefineSection(5,-74.0,60.8,278.);
+  tpc->DefineSection(2,-270.,77.,278.);
+  tpc->DefineSection(3,-259.6,70.,278.);
   //
-  tpc->DefineSection(6,-74.0,60.1,278.);
-  tpc->DefineSection(7,-73.3,60.1,278.);
+  tpc->DefineSection(4,-259.6,68.1,278.);
+  tpc->DefineSection(5,-253.6,68.1,278.);
   //
-  tpc->DefineSection(8,-73.3,56.9,278.); 
-  tpc->DefineSection(9,73.3,56.9,278.);
+  tpc->DefineSection(6,-253.6,68.,278.);
+  tpc->DefineSection(7,-74.0,60.8,278.);
   //
-  tpc->DefineSection(10,73.3,60.1,278.);
-  tpc->DefineSection(11,74.0,60.1,278.);
+  tpc->DefineSection(8,-74.0,60.1,278.);
+  tpc->DefineSection(9,-73.3,60.1,278.);
   //
-  tpc->DefineSection(12,74.0,60.8,278.);
-  tpc->DefineSection(13,253.6,65.5,278.);
+  tpc->DefineSection(10,-73.3,56.9,278.); 
+  tpc->DefineSection(11,73.3,56.9,278.);
   //
-  tpc->DefineSection(14,253.6,65.6,278.);
-  tpc->DefineSection(15,259.6,65.6,278.);
+  tpc->DefineSection(12,73.3,60.1,278.);
+  tpc->DefineSection(13,74.0,60.1,278.);
   //
-  tpc->DefineSection(16,259.6,70.0,278.);
-  tpc->DefineSection(17,290.,77.,278.);
+  tpc->DefineSection(14,74.0,60.8,278.);
+  tpc->DefineSection(15,253.6,65.5,278.);
+  //
+  tpc->DefineSection(16,253.6,65.6,278.);
+  tpc->DefineSection(17,259.6,65.6,278.);
+  //
+  tpc->DefineSection(18,259.6,70.0,278.);
+  tpc->DefineSection(19,291.,77.,278.);
   //
   TGeoMedium *m1 = gGeoManager->GetMedium("TPC_Air");
   TGeoVolume *v1 = new TGeoVolume("TPC_M",tpc,m1);
@@ -392,8 +396,8 @@ void AliTPCv4::CreateGeometry()
   TGeoTube *cs = new TGeoTube(56.9,61.2,0.1);
   TGeoMedium *sm7 = gGeoManager->GetMedium("TPC_Mylar");
   TGeoVolume *csv = new TGeoVolume("TPC_CDRS",cs,sm7);
-  v1->AddNode(csv,1,new TGeoTranslation(0.,0.,-71.));
-  v1->AddNode(csv,2,new TGeoTranslation(0.,0.,71.));
+  v1->AddNode(csv,1,new TGeoTranslation(0.,0.,-71.2));
+  v1->AddNode(csv,2,new TGeoTranslation(0.,0.,71.2));
   //
   // seal collars 
   TGeoPcon *se = new TGeoPcon(0.,360.,6);
@@ -847,6 +851,9 @@ void AliTPCv4::CreateGeometry()
   //----------------------------------------------------------
   TGeoMedium *m6=gGeoManager->GetMedium("TPC_Makrolon");
   TGeoMedium *m7=gGeoManager->GetMedium("TPC_Cu");
+  TGeoMedium *m10 =  gGeoManager->GetMedium("TPC_Alumina");
+  TGeoMedium *m11 =  gGeoManager->GetMedium("TPC_Peek");
+  TGeoMedium *m12 =  gGeoManager->GetMedium("TPC_Water");
   // upper and lower rods differ in length!
   delete [] upar;
   upar=NULL;
@@ -863,7 +870,50 @@ void AliTPCv4::CreateGeometry()
   TGeoVolume *hvrv = new TGeoVolume("TPC_HV_Rod",hvr,m6);
   TGeoVolume *hvcv = new TGeoVolume("TPC_HV_Cable",hvc,m7);
   hvrv->AddNode(hvcv,1);
-  
+  //
+  // resistor rods
+  //
+  TGeoTube *cri = new TGeoTube(0.,0.45,126.64); //inner 
+  TGeoTube *cro = new TGeoTube(0.,0.45,126.54); //outer 
+  TGeoTube *cwi = new TGeoTube(0.,0.15,126.64); // water inner
+  TGeoTube *cwo = new TGeoTube(0.,0.15,126.54); // water outer
+  //
+  TGeoVolume *criv = new TGeoVolume("TPC_CR_I",cri,m10);
+  TGeoVolume *crov = new TGeoVolume("TPC_CR_O",cro,m10);    
+  TGeoVolume *cwiv = new TGeoVolume("TPC_W_I",cwi,m11);
+  TGeoVolume *cwov = new TGeoVolume("TPC_W_O",cwo,m11);   
+  //
+  // ceramic rod with water
+  //
+  criv->AddNode(cwiv,1); 
+  crov->AddNode(cwov,1);
+  //
+  TGeoTube *pri =new TGeoTube(0.2,0.35,126.64); //inner 
+  TGeoTube *pro = new TGeoTube(0.2,0.35,126.54); //outer    
+  //
+  // peek rod
+  //
+  TGeoVolume *priv = new TGeoVolume("TPC_PR_I",pri,m12);
+  TGeoVolume *prov = new TGeoVolume("TPC_PR_O",pro,m12); 
+  //
+  // resistor rods assembly
+  //
+   TGeoRotation rotr("rotr");
+   rotr.RotateZ(-21.);
+  //
+  TGeoTube *rri = new TGeoTube(1.8,2.2,126.64);//inner
+  TGeoTube *rro = new TGeoTube(1.8,2.2,126.54);//inner
+  //
+  TGeoVolume *rriv = new TGeoVolume("TPC_RR_I",rri,m6);
+  TGeoVolume *rrov = new TGeoVolume("TPC_RR_O",rro,m6);  
+  //
+  rrov->AddNode(crov,1,new TGeoCombiTrans(0.5,0.866,0.,&rotr));
+  rrov->AddNode(crov,2,new TGeoCombiTrans(-0.5,0.866,0.,&rotr));
+  rrov->AddNode(prov,1);
+  //
+  rriv->AddNode(criv,1,new TGeoCombiTrans(0.5,0.866,0.,&rotr));
+  rriv->AddNode(criv,2,new TGeoCombiTrans(-0.5,0.866,0.,&rotr));
+  rriv->AddNode(priv,1); 
   for(Int_t i=0;i<18;i++){
     Double_t angle,x,y;
     Double_t z,r; 
@@ -873,21 +923,36 @@ void AliTPCv4::CreateGeometry()
     y=r * TMath::Sin(angle);
     upar[2]=126.64; //lower
     z= 126.96;
-    if(i==15){
-      v9->AddNode(hvrv,1,new TGeoTranslation(x,y,z));
-      v9->AddNode(hvrv,2,new TGeoTranslation(x,y,-z));
-    }
-    else{
-     gGeoManager->Node("TPC_Rod",i+1,"TPC_Drift",x,y,z,0,kTRUE,upar,3);//shaft
-     gGeoManager->Node("TPC_Rod",i+19,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);//muon
+    //
+    if(i==3){
+      v9->AddNode(rriv,1,new TGeoTranslation(x,y,z)); //A
+      v9->AddNode(rriv,2,new TGeoTranslation(x,y,-z)); //C      
+    } 
+    else { 
+      gGeoManager->Node("TPC_Rod",i+1,"TPC_Drift",x,y,z,0,kTRUE,upar,3);//shaft
+      gGeoManager->Node("TPC_Rod",i+19,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);//muon
     }
+   
+
+    //
     r=254.25;
     x=r * TMath::Cos(angle);
     y=r * TMath::Sin(angle);
     upar[2]=126.54; //upper
     z=127.06;
-    gGeoManager->Node("TPC_Rod",i+37,"TPC_Drift",x,y,z,0,kTRUE,upar,3);
-    gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
+    if(i==15){
+      v9->AddNode(hvrv,1,new TGeoTranslation(x,y,z));//A-side only
+      gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
+    }
+    else if(i==11){
+      v9->AddNode(rrov,1,new TGeoTranslation(x,y,z)); //A
+      v9->AddNode(rrov,2,new TGeoTranslation(x,y,-z)); //C
+    }
+    else{
+    //
+      gGeoManager->Node("TPC_Rod",i+37,"TPC_Drift",x,y,z,0,kTRUE,upar,3);
+      gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
+    }
   }
 
   TGeoVolume *alice = gGeoManager->GetVolume("ALIC");
-- 
2.43.5