ITS3: fix service material

Signed-off-by: Felix Schlepper <felix.schlepper@cern.ch>

Author: f3sch

Detectors/Upgrades/ITS3/simulation/src/ITS3Services.cxx

@@ -31,8 +31,8 @@ void ITS3Services::createCYSSAssembly(TGeoVolume* motherVolume)
 
   // Cylinder
   auto cyssInnerCylSh = new TGeoTubeSeg(constants::services::radiusInner, constants::services::radiusOuter, constants::services::length / 2, 180, 360);
-  auto medPrepreg = gGeoManager->GetMedium("IT3_AS4C200$");
-  auto cyssInnerCylShVol = new TGeoVolume("IBCYSSCylinder", cyssInnerCylSh, medPrepreg);
+  auto medRohacell = gGeoManager->GetMedium("IT3_RIST110$");
+  auto cyssInnerCylShVol = new TGeoVolume("IBCYSSCylinder", cyssInnerCylSh, medRohacell);
   cyssInnerCylShVol->SetLineColor(constants::services::color);
   cyssVol->AddNode(cyssInnerCylShVol, 1, new TGeoTranslation(0, 0, 0));
   cyssVol->AddNode(cyssInnerCylShVol, 2, new TGeoCombiTrans(0, 0, 0, new TGeoRotation("", 180, 0, 0)));