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25 //
26 /// \file field/BlineTracer/src/G4BlinePrimaryGeneratorAction.cc
27 /// \brief Implementation of the G4BlinePrimaryGeneratorAction class
28 //
29 //
30 //
31 //
32 // --------------------------------------------------------------------
33 //
34 // G4BlinePrimaryGeneratorAction implementation
35 //
36 // --------------------------------------------------------------------
37 // Author: Laurent Desorgher (desorgher@phim.unibe.ch)
38 // Created - 2003-10-06
39 // --------------------------------------------------------------------
40
41 #include "G4BlinePrimaryGeneratorAction.hh"
42
43 #include "G4ChargedGeantino.hh"
44 #include "G4Event.hh"
45 #include "G4SystemOfUnits.hh"
46 #include "G4Types.hh"
47
48 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
49
50 void G4BlinePrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
51 {
52 if (!fUserPrimaryAction) {
53 G4Exception("G4BlinePrimaryGeneratorAction::GeneratePrimaries()", "NullPointer", JustWarning,
54 "Primary generator action not defined !");
55 return;
56 }
57
58 // For the first part of a bline the start position and time are defined
59 // by using the USER primary action while for the second part the previous
60 // values are taken.
61
62 if (fFirstPartOfBline) {
63 // set the position and time defined by using the USER primary action
64
65 auto tmpEvent = new G4Event();
66 fUserPrimaryAction->GeneratePrimaries(tmpEvent);
67 fBlineStartPosition = tmpEvent->GetPrimaryVertex()->GetPosition();
68 fT0 = tmpEvent->GetPrimaryVertex()->GetT0();
69 delete tmpEvent;
70 }
71 fFirstPartOfBline = false;
72
73 auto primary_vertex = new G4PrimaryVertex(fBlineStartPosition, fT0);
74
75 // Define the particle to be tracked as Charged Geantino
76
77 G4ChargedGeantino* pdef = G4ChargedGeantino::ChargedGeantino();
78
79 G4double mass = pdef->GetPDGMass();
80 G4double energy = 10000. * MeV + mass;
81 G4double pmom = std::sqrt(energy * energy - mass * mass);
82
83 // The momentum direction and energy do not have an effect in tracing of
84 // bline but still need to be defined.
85
86 G4double px = 0.;
87 G4double py = 0.;
88 G4double pz = pmom;
89
90 auto particle = new G4PrimaryParticle(pdef, px, py, pz);
91 particle->SetMass(mass);
92 particle->SetCharge(pdef->GetPDGCharge());
93 primary_vertex->SetPrimary(particle);
94
95 anEvent->AddPrimaryVertex(primary_vertex);
96 }
97