MVD with 2 and 3 stations

Based upon mvd_v20c_tr
mvd_v20f has first station removed,
mvd_v20g has first two stations removed,
The top and bottom plate are also removed.

Added a missing HexPly material in media.geo.
updated sis18_electron to use mvd_v20g_tr, added back magnet geometry

media.geo

@@ -79,6 +79,10 @@ BP_carbonfiber 4  12.011  1.0079  35.453  15.999  6.0  1.0  17.  8.0  1.5  0.892
                0  1  20.  .001
                0
 
+BP_HexPly      4  12.011  1.0079  35.453  15.999  6.0  1.0  17.  8.0  1.5  0.8926  0.0192  0.0271  0.0611
+               0  1  20.  .001
+               0
+
 // ---------------------------------------------------------------------------
 
 

mvd/mvd_v20g_tr.geo.info

+TFile* ofile
+TFile* nfile
+ofile = TFile::Open("mvd_v20c_tr.geo.root")
+nfile = TFile::Open("mvd_v20g_tr.geo.root","RECREATE")
+TGeoVolume* top = (TGeoVolume *) ofile->Get("Top")
+TGeoNode* node = top->GetNode("MVDscripted_1")
+TGeoNodeMatrix* nm
+TGeoVolume* ntop
+ntop = new TGeoVolume("Top", top->GetShape(), top->GetMedium())
+int id=0
+nm = (TGeoNodeMatrix *) node->GetDaughter(1)
+ntop->AddNode(nm->GetVolume(),id++,nm->GetMatrix())
+nm = (TGeoNodeMatrix *) node->GetDaughter(2)
+ntop->AddNode(nm->GetVolume(),id++,nm->GetMatrix())
+nm = (TGeoNodeMatrix *) node->GetDaughter(3)
+ntop->AddNode(nm->GetVolume(),id++,nm->GetMatrix())
+ntop->GetNodes()->Print()
+ntop->GetName()
+ntop->GetMedium()->Print()
+ntop->SetAsTopVolume()
+nfile->WriteTObject(ntop)
+nfile->Close()

setup/setup_sis18_electron.C

@@ -6,13 +6,12 @@
 // 2022-03-15 - EC - Introduced after proposal to use CBM with sis18 beam.
 // clang-format off
 
-#include <TGeoTranslation.h> 
-
 void setup_sis18_electron()
 {
   // -----  Geometry Tags  --------------------------------------------------
+  TString magnetGeoTag    = "v21a";
   TString pipeGeoTag      = "v22c";
-  TString mvdGeoTag       = "v20a_tr";
+  TString mvdGeoTag       = "v20g_tr";
   TString stsGeoTag       = "v21e_sis18";
   TString tofGeoTag       = "v21b_1h_sis18";
 
@@ -30,6 +29,7 @@ void setup_sis18_electron()
   	setup->Clear();
   }
   setup->SetTitle("SIS100 - Electron Setup");
+  setup->SetModule(ECbmModuleId::kMagnet, magnetGeoTag);
   setup->SetModule(ECbmModuleId::kPipe, pipeGeoTag);
   setup->SetModule(ECbmModuleId::kMvd, mvdGeoTag);
   setup->SetModule(ECbmModuleId::kSts, stsGeoTag);