BlineTracer/src/G4BlinePrimaryGeneratorAction.cc

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0025 //
0026 /// \file G4BlinePrimaryGeneratorAction.cc
0027 /// \brief Implementation of the G4BlinePrimaryGeneratorAction class
0028
0029 // --------------------------------------------------------------------
0030 //
0031 // G4BlinePrimaryGeneratorAction implementation
0032 //
0033 // --------------------------------------------------------------------
0034 // Author: Laurent Desorgher (desorgher@phim.unibe.ch)
0035 //         Created - 2003-10-06
0036 // --------------------------------------------------------------------
0037
0038 #include "G4BlinePrimaryGeneratorAction.hh"
0039
0040 #include "G4ChargedGeantino.hh"
0041 #include "G4Event.hh"
0042 #include "G4SystemOfUnits.hh"
0043 #include "G4Types.hh"
0044
0045 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0046
0047 void G4BlinePrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0048 {
0049   if (!fUserPrimaryAction) {
0050     G4Exception("G4BlinePrimaryGeneratorAction::GeneratePrimaries()", "NullPointer", JustWarning,
0051                 "Primary generator action not defined !");
0052     return;
0053   }
0054
0055   // For the first part of a bline the start position and time are defined
0056   // by using the USER primary action while for the second part the previous
0057   // values are taken.
0058
0059   if (fFirstPartOfBline) {
0060     // set the position and time defined by using the USER primary action
0061
0062     auto tmpEvent = new G4Event();
0063     fUserPrimaryAction->GeneratePrimaries(tmpEvent);
0064     fBlineStartPosition = tmpEvent->GetPrimaryVertex()->GetPosition();
0065     fT0 = tmpEvent->GetPrimaryVertex()->GetT0();
0066     delete tmpEvent;
0067   }
0068   fFirstPartOfBline = false;
0069
0070   auto primary_vertex = new G4PrimaryVertex(fBlineStartPosition, fT0);
0071
0072   // Define the particle to be tracked as Charged Geantino
0073
0074   G4ChargedGeantino* pdef = G4ChargedGeantino::ChargedGeantino();
0075
0076   G4double mass = pdef->GetPDGMass();
0077   G4double energy = 10000. * MeV + mass;
0078   G4double pmom = std::sqrt(energy * energy - mass * mass);
0079
0080   // The momentum direction and energy do not have an effect in tracing of
0081   // bline but still need to be defined.
0082
0083   G4double px = 0.;
0084   G4double py = 0.;
0085   G4double pz = pmom;
0086
0087   auto particle = new G4PrimaryParticle(pdef, px, py, pz);
0088   particle->SetMass(mass);
0089   particle->SetCharge(pdef->GetPDGCharge());
0090   primary_vertex->SetPrimary(particle);
0091
0092   anEvent->AddPrimaryVertex(primary_vertex);
0093 }