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25 //
26 // Author: Sebastien Incerti
27 // 22 January 2012
28 // on base of G4LivermoreGammaConversionModel (original version)
29 // and G4LivermoreRayleighModel (MT version)
30 //
31 // Modifications: Zhuxin Li@CENBG
32 // 11 March 2020
33 // derives from G4PairProductionRelModel
34 // -------------------------------------------------------------------
35
36 #include "G4LivermoreGammaConversionModel.hh"
37
38 #include "G4AutoLock.hh"
39 #include "G4Electron.hh"
40 #include "G4EmParameters.hh"
41 #include "G4Exp.hh"
42 #include "G4ParticleChangeForGamma.hh"
43 #include "G4PhysicalConstants.hh"
44 #include "G4PhysicsFreeVector.hh"
45 #include "G4SystemOfUnits.hh"
46
47 namespace
48 {
49 G4Mutex LivermoreGammaConversionModelMutex = G4MUTEX_INITIALIZER;
50 }
51
52 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
53 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
54
55 G4PhysicsFreeVector* G4LivermoreGammaConversionModel::data[] = {nullptr};
56 G4String G4LivermoreGammaConversionModel::gDataDirectory = "";
57
58 G4LivermoreGammaConversionModel::G4LivermoreGammaConversionModel(const G4ParticleDefinition* p,
59 const G4String& nam)
60 : G4PairProductionRelModel(p, nam)
61 {
62 fParticleChange = nullptr;
63 lowEnergyLimit = 2. * CLHEP::electron_mass_c2;
64 verboseLevel = 0;
65 // Verbosity scale for debugging purposes:
66 // 0 = nothing
67 // 1 = calculation of cross sections, file openings...
68 // 2 = entering in methods
69 if (verboseLevel > 0) {
70 G4cout << "G4LivermoreGammaConversionModel is constructed " << G4endl;
71 }
72 }
73
74 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
75
76 G4LivermoreGammaConversionModel::~G4LivermoreGammaConversionModel()
77 {
78 if (IsMaster()) {
79 for (G4int i = 0; i <= maxZ; ++i) {
80 if (data[i]) {
81 delete data[i];
82 data[i] = nullptr;
83 }
84 }
85 }
86 }
87
88 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
89
90 void G4LivermoreGammaConversionModel::Initialise(const G4ParticleDefinition* particle,
91 const G4DataVector& cuts)
92 {
93 G4PairProductionRelModel::Initialise(particle, cuts);
94 if (verboseLevel > 1) {
95 G4cout << "Calling Initialise() of G4LivermoreGammaConversionModel." << G4endl
96 << "Energy range: " << LowEnergyLimit() / MeV << " MeV - " << HighEnergyLimit() / GeV
97 << " GeV isMater: " << IsMaster() << G4endl;
98 }
99
100 if (IsMaster()) {
101 // Initialise element selector
102 InitialiseElementSelectors(particle, cuts);
103
104 // Access to elements
105 const G4ElementTable* elemTable = G4Element::GetElementTable();
106 std::size_t numElems = (*elemTable).size();
107 for (std::size_t ie = 0; ie < numElems; ++ie) {
108 const G4Element* elem = (*elemTable)[ie];
109 const G4int Z = std::min(maxZ, elem->GetZasInt());
110 if (data[Z] == nullptr) {
111 ReadData(Z);
112 }
113 }
114 }
115 if (isInitialised) {
116 return;
117 }
118 fParticleChange = GetParticleChangeForGamma();
119 isInitialised = true;
120 }
121
122 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
123
124 const G4String& G4LivermoreGammaConversionModel::FindDirectoryPath()
125 {
126 // no check in this method - environment variable is check by utility
127 if (gDataDirectory.empty()) {
128 auto param = G4EmParameters::Instance();
129 std::ostringstream ost;
130 if (param->LivermoreDataDir() == "livermore") {
131 ost << param->GetDirLEDATA() << "/livermore/pair/";
132 useSpline = true;
133 }
134 else {
135 ost << param->GetDirLEDATA() << "/epics2017/pair/";
136 }
137 gDataDirectory = ost.str();
138 }
139 return gDataDirectory;
140 }
141
142 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
143
144 void G4LivermoreGammaConversionModel::ReadData(const G4int Z)
145 {
146 if (verboseLevel > 1) {
147 G4cout << "Calling ReadData() of G4LivermoreGammaConversionModel" << G4endl;
148 }
149
150 if (data[Z] != nullptr) {
151 return;
152 }
153
154 std::ostringstream ost;
155 ost << FindDirectoryPath() << "pp-cs-" << Z << ".dat";
156
157 data[Z] = new G4PhysicsFreeVector(useSpline);
158
159 std::ifstream fin(ost.str().c_str());
160
161 if (!fin.is_open()) {
162 G4ExceptionDescription ed;
163 ed << "G4LivermoreGammaConversionModel data file <" << ost.str().c_str() << "> is not opened!"
164 << G4endl;
165 G4Exception("G4LivermoreGammaConversionModel::ReadData()", "em0003", FatalException, ed,
166 "G4LEDATA version should be G4EMLOW8.0 or later.");
167 return;
168 }
169 else {
170 if (verboseLevel > 1) {
171 G4cout << "File " << ost.str() << " is opened by G4LivermoreGammaConversionModel" << G4endl;
172 }
173
174 data[Z]->Retrieve(fin, true);
175 }
176 // Activation of spline interpolation
177 if (useSpline) data[Z]->FillSecondDerivatives();
178 }
179
180 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
181
182 G4double
183 G4LivermoreGammaConversionModel::ComputeCrossSectionPerAtom(const G4ParticleDefinition* particle,
184 G4double GammaEnergy, G4double Z,
185 G4double, G4double, G4double)
186 {
187 if (verboseLevel > 1) {
188 G4cout << "G4LivermoreGammaConversionModel::ComputeCrossSectionPerAtom() Z= " << Z << G4endl;
189 }
190
191 if (GammaEnergy < lowEnergyLimit) {
192 return 0.0;
193 }
194
195 G4double xs = 0.0;
196
197 G4int intZ = std::max(1, std::min(G4lrint(Z), maxZ));
198
199 G4PhysicsFreeVector* pv = data[intZ];
200
201 // if element was not initialised
202 // do initialisation safely for MT mode
203 if (pv == nullptr) {
204 InitialiseForElement(particle, intZ);
205 pv = data[intZ];
206 if (pv == nullptr) {
207 return xs;
208 }
209 }
210 // x-section is taken from the table
211 xs = pv->Value(GammaEnergy);
212
213 if (verboseLevel > 0) {
214 G4cout << "*** Gamma conversion xs for Z=" << Z << " at energy E(MeV)=" << GammaEnergy / MeV
215 << " cs=" << xs / millibarn << " mb" << G4endl;
216 }
217 return xs;
218 }
219
220 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
221
222 void G4LivermoreGammaConversionModel::InitialiseForElement(const G4ParticleDefinition*, G4int Z)
223 {
224 G4AutoLock l(&LivermoreGammaConversionModelMutex);
225 if (data[Z] == nullptr) {
226 ReadData(Z);
227 }
228 l.unlock();
229 }
230
231 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
232