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25 //
26
27 // GEANT 4 class implementation file --- Copyright CERN 1995
28
29 // History:
30 // 29.02.04 V.Ivanchenko create
31 // 28.07.05, P.Gumplinger add G4ProcessType to constructor
32
33 #include "G4VTransitionRadiation.hh"
34
35 #include "G4EmProcessSubType.hh"
36 #include "G4LossTableManager.hh"
37 #include "G4Material.hh"
38 #include "G4ParticleDefinition.hh"
39 #include "G4Region.hh"
40 #include "G4TransportationManager.hh"
41 #include "G4VTRModel.hh"
42
43 ///////////////////////////////////////////////////////////////////////
44 G4VTransitionRadiation::G4VTransitionRadiation(const G4String& processName,
45 G4ProcessType type)
46 : G4VDiscreteProcess(processName, type)
47 , region(nullptr)
48 , model(nullptr)
49 , gammaMin(100.)
50 , cosDThetaMax(std::cos(0.1))
51 , nSteps(0)
52 {
53 SetProcessSubType(fTransitionRadiation);
54 Clear();
55 theManager = G4LossTableManager::Instance();
56 theManager->Register(this);
57 }
58
59 ///////////////////////////////////////////////////////////////////////
60 G4VTransitionRadiation::~G4VTransitionRadiation()
61 {
62 Clear();
63 theManager->DeRegister(this);
64 }
65
66 void G4VTransitionRadiation::ProcessDescription(std::ostream& out) const
67 {
68 out << "Generic process of transition radiation.\n";
69
70 if(model)
71 model->PrintInfo();
72 }
73
74 ///////////////////////////////////////////////////////////////////////
75 void G4VTransitionRadiation::Clear()
76 {
77 materials.clear();
78 steps.clear();
79 normals.clear();
80 nSteps = 0;
81 }
82
83 ///////////////////////////////////////////////////////////////////////
84 G4VParticleChange* G4VTransitionRadiation::PostStepDoIt(const G4Track& track,
85 const G4Step& step)
86 {
87 // Fill temporary vectors
88 const G4Material* material = track.GetMaterial();
89 G4double length = step.GetStepLength();
90 G4ThreeVector direction = track.GetMomentumDirection();
91
92 if(nSteps == 0)
93 {
94 nSteps = 1;
95 materials.push_back(material);
96 steps.push_back(length);
97 const G4StepPoint* point = step.GetPreStepPoint();
98 startingPosition = point->GetPosition();
99 startingDirection = point->GetMomentumDirection();
100 G4bool valid = true;
101 G4ThreeVector n = G4TransportationManager::GetTransportationManager()
102 ->GetNavigatorForTracking()
103 ->GetLocalExitNormal(&valid);
104 if(valid)
105 normals.push_back(n);
106 else
107 normals.push_back(direction);
108 }
109 else
110 {
111 if(material == materials[nSteps - 1])
112 {
113 steps[nSteps - 1] += length;
114 }
115 else
116 {
117 ++nSteps;
118 materials.push_back(material);
119 steps.push_back(length);
120 G4bool valid = true;
121 G4ThreeVector n = G4TransportationManager::GetTransportationManager()
122 ->GetNavigatorForTracking()
123 ->GetLocalExitNormal(&valid);
124 if(valid)
125 normals.push_back(n);
126 else
127 normals.push_back(direction);
128 }
129 }
130
131 // Check PostStepPoint condition
132 if(track.GetTrackStatus() == fStopAndKill ||
133 track.GetVolume()->GetLogicalVolume()->GetRegion() != region ||
134 startingDirection.x() * direction.x() +
135 startingDirection.y() * direction.y() +
136 startingDirection.z() * direction.z() <
137 cosDThetaMax)
138 {
139 if(model)
140 {
141 model->GenerateSecondaries(*pParticleChange, materials, steps, normals,
142 startingPosition, track);
143 }
144 Clear();
145 }
146
147 return pParticleChange;
148 }
149
150 ///////////////////////////////////////////////////////////////////////
151 G4bool G4VTransitionRadiation::IsApplicable(
152 const G4ParticleDefinition& aParticle)
153 {
154 return (aParticle.GetPDGCharge() != 0.0);
155 }
156
157 ///////////////////////////////////////////////////////////////////////
158 void G4VTransitionRadiation::SetRegion(const G4Region* reg) { region = reg; }
159
160 ///////////////////////////////////////////////////////////////////////
161 void G4VTransitionRadiation::SetModel(G4VTRModel* mod) { model = mod; }
162
163 ///////////////////////////////////////////////////////////////////////
164 G4double G4VTransitionRadiation::GetMeanFreePath(const G4Track& track, G4double,
165 G4ForceCondition* condition)
166 {
167 if(nSteps > 0)
168 {
169 *condition = StronglyForced;
170 }
171 else
172 {
173 *condition = NotForced;
174 if(track.GetKineticEnergy() / track.GetDefinition()->GetPDGMass() + 1.0 >
175 gammaMin &&
176 track.GetVolume()->GetLogicalVolume()->GetRegion() == region)
177 {
178 *condition = StronglyForced;
179 }
180 }
181 return DBL_MAX; // so TR doesn't limit mean free path
182 }
183