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25 //
26 //
27 /// \file GB05BOptrSplitAndKillByCrossSection.cc
28 /// \brief Implementation of the GB05BOptrSplitAndKillByCrossSection class
29
30 #include "GB05BOptrSplitAndKillByCrossSection.hh"
31
32 #include "GB05BOptnSplitAndKillByCrossSection.hh"
33
34 #include "G4BiasingProcessInterface.hh"
35 #include "G4ParticleDefinition.hh"
36 #include "G4ParticleTable.hh"
37 #include "G4VProcess.hh"
38
39 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
40
41 GB05BOptrSplitAndKillByCrossSection::GB05BOptrSplitAndKillByCrossSection(G4String particleName,
42 G4String name)
43 : G4VBiasingOperator(name), fSetup(true)
44 {
45 fParticleToBias = G4ParticleTable::GetParticleTable()->FindParticle(particleName);
46
47 if (fParticleToBias == 0) {
48 G4ExceptionDescription ed;
49 ed << "Particle `" << particleName << "' not found !" << G4endl;
50 G4Exception("GB05BOptrSplitAndKillByCrossSection(...)", "exGB05.01", JustWarning, ed);
51 }
52
53 fSplitAndKillByCrossSection =
54 new GB05BOptnSplitAndKillByCrossSection("splitterFor_" + particleName);
55 }
56
57 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
58
59 GB05BOptrSplitAndKillByCrossSection::~GB05BOptrSplitAndKillByCrossSection()
60 {
61 delete fSplitAndKillByCrossSection;
62 }
63
64 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
65
66 void GB05BOptrSplitAndKillByCrossSection::StartRun()
67 {
68 // ---------------
69 // -- Setup stage:
70 // ---------------
71 // -- Start by collecting the pointer of the physics processes
72 // -- considered for the splitting by cross-sections. Doing so,
73 // -- this also verifies that these physics processes are each
74 // -- under control of a G4BiasingProcessInterface wrapper.
75 if (fSetup) {
76 const G4ProcessManager* processManager = fParticleToBias->GetProcessManager();
77 const G4BiasingProcessSharedData* sharedData =
78 G4BiasingProcessInterface::GetSharedData(processManager);
79 if (sharedData) {
80 for (size_t i = 0; i < fProcessesToEquipoise.size(); i++) {
81 G4bool processFound(false);
82 for (size_t j = 0; j < (sharedData->GetPhysicsBiasingProcessInterfaces()).size(); j++) {
83 const G4BiasingProcessInterface* wrapperProcess =
84 (sharedData->GetPhysicsBiasingProcessInterfaces())[j];
85 if (fProcessesToEquipoise[i] == wrapperProcess->GetWrappedProcess()->GetProcessName()) {
86 fProcesses.push_back(wrapperProcess->GetWrappedProcess());
87 processFound = true;
88 break;
89 }
90 }
91 if (!processFound) {
92 G4String particleName = "(unknown)";
93 if (fParticleToBias != nullptr) {
94 particleName = fParticleToBias->GetParticleName();
95 }
96 G4ExceptionDescription ed;
97 ed << "Process `" << fProcessesToEquipoise[i] << "' not found for particle `"
98 << particleName << "'" << G4endl;
99 G4Exception("GB05BOptrSplitAndKillByCrossSection::StartRun(...)", "exGB05.02",
100 JustWarning, ed);
101 }
102 }
103 }
104 fSetup = false;
105 }
106
107 if (fProcessesToEquipoise.size() == 0 || fProcesses.size() == 0) {
108 G4ExceptionDescription ed;
109 ed << "No processes to counterbalance for defined or found ! "
110 << "Biasing will do nothing." << G4endl;
111 G4Exception("GB05BOptrSplitAndKillByCrossSection::StartRun(...)", "exGB05.03", JustWarning, ed);
112 }
113 }
114
115 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
116
117 G4VBiasingOperation* GB05BOptrSplitAndKillByCrossSection::ProposeNonPhysicsBiasingOperation(
118 const G4Track* track, const G4BiasingProcessInterface* /*callingProcess*/)
119 {
120 // -----------------------------------------------------
121 // -- Check if current particle type is the one to bias:
122 // -----------------------------------------------------
123 if (track->GetDefinition() != fParticleToBias) return 0;
124
125 // --------------------------------------------------------------------
126 // -- Compute the total cross-section for the physics processes
127 // -- considered.
128 // -- These physics processes have been updated to the current track
129 // -- state by their related wrapper G4BiasingProcessInterface objects,
130 // -- the cross-sections/mean free pathes are hence usable.
131 // --------------------------------------------------------------------
132 G4double totalCrossSection(0.0);
133 for (size_t i = 0; i < fProcesses.size(); i++) {
134 G4double interactionLength = fProcesses[i]->GetCurrentInteractionLength();
135 if (interactionLength < DBL_MAX / 10.) totalCrossSection += 1. / interactionLength;
136 }
137 if (totalCrossSection < DBL_MIN) return 0;
138
139 G4double totalInteractionLength = 1. / totalCrossSection;
140
141 // ---------------------------------------------------------------------
142 // -- Passes the updated "absorption" cross-section (interaction length)
143 // -- to the biasing operation, and returns this operation:
144 // ---------------------------------------------------------------------
145 fSplitAndKillByCrossSection->SetInteractionLength(totalInteractionLength);
146
147 return fSplitAndKillByCrossSection;
148 }
149
150 void GB05BOptrSplitAndKillByCrossSection::AddProcessToEquipoise(G4String processName)
151 {
152 fProcessesToEquipoise.push_back(processName);
153 }
154