FedraVMC Tutorial

Tutorial macros

Following tutorial macros can be found in macro/tutorials/ directory of current version

tutorial1.C

Illustration of basic simulation: simulate and draw

   EMCApplication *appl = NULL;
   if (!TVirtualMCApplication::Instance()) appl=new EMCApplication("tutorial1", "FVMC tutorial #1");
   else                                    appl = (EMCApplication*)TVirtualMCApplication::Instance();
   appl->SetGeneratorName("PromptTracks");                  ///propagation of primary particles with given attributes
   ///you may use different transports:
   //     appl->InitMC("g3Config.C");           ///use GEANT3
   //     appl->InitMC("flConfig.C");           ///use FLUKA
   appl->InitMC("g4Config.C");               ///use GEANT4
   ///set primary parameters:
   appl->GetGenerator()->SetNumberOfPrimaries(10);         //10 primaries at once!
   appl->GetGenerator()->SetPDG(211);                      //set pdg code of primary: pi+
   appl->GetGenerator()->SetEnergyInterval(2,5);           //set energy of primary - random from 2 to 5 Gev
   appl->GetGenerator()->SetThetaInterval(0,45);           //initial inclination angle. From 0 to 45 degrees
   appl->GetGenerator()->SetPosInterval(TVector3(-1,-1,-3.6),TVector3(1,1,-3.6)); //initial position - in cm
   
   appl->RunMC(1,true); ///simulate 1 event and close simulation
   
   VMCEvent* event=appl->GetEventTree();                    ///get simulated event
   gGeoManager->GetTopVolume()-> Draw();                    ///draw brick
   event->DrawTracks("CN");                                /// draw both charged and neutral tracks

You should get a canvas with something like this:

tutorial2.C

Illustration of simulation and reconstruction

   ///
   ///tutorial macro - illustration of event simulation and reconstruction
   ///Author: Andrey Sheshukov
   
   // simulation part - same as in tutorial1
   EMCApplication *appl = NULL;
   if (!TVirtualMCApplication::Instance()) appl=new EMCApplication("tutorial1", "FVMC tutorial #1");
   else                                    appl = (EMCApplication*)TVirtualMCApplication::Instance();
   appl->SetGeneratorName("PromptTracks"); ///propagation of primary particles with given attributes
   ///you may use different transports:
   //appl->InitMC("g3Config.C"); ///use GEANT3
   //appl->InitMC("flConfig.C"); ///use FLUKA
   appl->InitMC("g4Config.C");  ///use GEANT4
   ///set primary parameters:
   appl->GetGenerator()->SetNumberOfPrimaries(5);  //5 primaries at once!
   appl->GetGenerator()->SetPDG(15);              //set pdg code of primary: tau-
   appl->GetGenerator()->SetEnergyInterval(2,5);   //set energy of primary - random from 2 to 5 Gev
   appl->GetGenerator()->SetThetaInterval(0,45);   //initial inclination angle. From 0 to 45 degrees
   appl->GetGenerator()->SetPosInterval(TVector3(-1,-1,-3.6),TVector3(1,1,-3.6)); //initial position - in cm
   
   appl->RunMC(1,true); ///simulate 1 event and close simulation
   
   VMCEvent* event=appl->GetEventTree(); //get simulated event
   TCanvas *c1=new TCanvas("tutorial2","Simulation&Reconstriction",800,300);
   c1->Divide(2,1);
   c1->cd(1);
   gGeoManager->GetTopVolume()-> Draw(); //draw brick
   event->DrawTracks("C"); // draw only charged tracks
   //gPad->GetView3D()->SetParallel();
   //prepare reconstruction
   GenRec* GR=new GenRec(); ///create interface to FEDRA
   GR->InitRec();          ///initialize reconstruction
   GR->SetEvt(event);     ///get an event
   GR->GetV2C()->SetScanVol(-3e4,3e4,-3e4,3e4,0,0); ///set scanning volume (6x6cm x all z range)
                                                ///if you want full brick use (0,0,0,0,0,0)
   //do reconstruction
   GR->V2C();       ///transform segments to FEDRA format
   GR->Prepare();   ///link FEDRA segments
   //GR->Align();   /// do the alignment based on current tracks
   GR->RecTracks(); ///reconstruct the tracks
   GR->RecVertex(); ///reconstruct vertices
   //draw reconstruction
   c1->cd(2);
   GR->DrawBrick();///draw brick volume
   GR->DrawSV();   ///draw scanning volume
   GR->DrawHits(); ///draw FEDRA segments
   GR->DrawTracks(1.); ///draw rec tracks
   GR->DrawVertices(2.); ///draw rec vertices(displayed as stars) - may not be found in some particular cases!
   ///clean reconstruction - use following lines in case you wan to clear reconstructed tracks&vertices
   ///(for example in case you want to use reconstruction in cycle):
   //GR->ResetTracks();
   //GR->ResetVertex();
   //GR->ResetAlign();
   ///If you want to clear all FEDRA segments in GR use this:
   //GR->Clear();
   //close reconstruction
   GR->CloseRec();
   c1->cd(1)->GetView()->SetParallel();

You should get a canvas with something like this: