[ALICE] Fix TRK services crossing (#15085)

Author: scannito

Detectors/Upgrades/ALICE3/TRK/simulation/src/TRKServices.cxx

@@ -264,8 +264,8 @@ void TRKServices::createMiddleServices(TGeoVolume* motherVolume)
   // Carbon Fiber Cylinder support for the middle tracker
   float rMinMiddleCarbonSupport = 34.8f; // Arbitrary value
   float rMaxMiddleCarbonSupport = 35.f;  // 2 mm of carbon fiber
-  const float zLengthMiddleCarbon = 64.2f;
-  TGeoTube* middleBarrelCarbonSupport = new TGeoTube("TRK_MID_CARBONSUPPORTsh", rMinMiddleCarbonSupport, rMaxMiddleCarbonSupport, zLengthMiddleCarbon);
+  const float zLengthMiddleCarbon = 129.f;
+  TGeoTube* middleBarrelCarbonSupport = new TGeoTube("TRK_MID_CARBONSUPPORTsh", rMinMiddleCarbonSupport, rMaxMiddleCarbonSupport, zLengthMiddleCarbon / 2.);
   TGeoVolume* middleBarrelCarbonSupportVolume = new TGeoVolume("TRK_MID_CARBONSUPPORT", middleBarrelCarbonSupport, medCFiber);
   middleBarrelCarbonSupportVolume->SetLineColor(kGray);
   LOGP(info, "Creating carbon fiber support for Middle Tracker");
@@ -318,7 +318,7 @@ void TRKServices::createMiddleServices(TGeoVolume* motherVolume)
   // Middle barrel connection disks
   const float rMinMiddleBarrelDisk = 5.68f;
   const float rMaxMiddleBarrelDisk = 35.f;
-  const float zLengthMiddleBarrel = 64.2f;
+  const float zLengthMiddleBarrel = 64.5f;
   for (auto& orientation : {Orientation::kASide, Orientation::kCSide}) {
     TGeoTube* middleBarrelConnDiskSIO2 = new TGeoTube(Form("TRK_MIDBARCONN_DISK_SIO2sh_%s", orientation == Orientation::kASide ? "bwd" : "fwd"), rMinMiddleBarrelDisk, rMaxMiddleBarrelDisk, siO2FiberThick / 2.);
     TGeoTube* middleBarrelConnDiskPE = new TGeoTube(Form("TRK_MIDBARCONN_DISK_PEsh_%s", orientation == Orientation::kASide ? "bwd" : "fwd"), rMinMiddleBarrelDisk, rMaxMiddleBarrelDisk, peFiberThick / 2.);