[968] | 1 | // |
---|
| 2 | // ******************************************************************** |
---|
| 3 | // * License and Disclaimer * |
---|
| 4 | // * * |
---|
| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
---|
| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
---|
| 7 | // * conditions of the Geant4 Software License, included in the file * |
---|
| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
---|
| 9 | // * include a list of copyright holders. * |
---|
| 10 | // * * |
---|
| 11 | // * Neither the authors of this software system, nor their employing * |
---|
| 12 | // * institutes,nor the agencies providing financial support for this * |
---|
| 13 | // * work make any representation or warranty, express or implied, * |
---|
| 14 | // * regarding this software system or assume any liability for its * |
---|
| 15 | // * use. Please see the license in the file LICENSE and URL above * |
---|
| 16 | // * for the full disclaimer and the limitation of liability. * |
---|
| 17 | // * * |
---|
| 18 | // * This code implementation is the result of the scientific and * |
---|
| 19 | // * technical work of the GEANT4 collaboration. * |
---|
| 20 | // * By using, copying, modifying or distributing the software (or * |
---|
| 21 | // * any work based on the software) you agree to acknowledge its * |
---|
| 22 | // * use in resulting scientific publications, and indicate your * |
---|
| 23 | // * acceptance of all terms of the Geant4 Software license. * |
---|
| 24 | // ******************************************************************** |
---|
| 25 | // |
---|
| 26 | // $Id: G4FinalStateElasticChampion.cc,v 1.7 2008/12/10 18:25:28 sincerti Exp $ |
---|
[991] | 27 | // GEANT4 tag $Name: geant4-09-02 $ |
---|
[968] | 28 | // ------------------------------------------------------------------- |
---|
| 29 | |
---|
| 30 | |
---|
| 31 | #include "G4FinalStateElasticChampion.hh" |
---|
| 32 | |
---|
| 33 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
| 34 | |
---|
| 35 | G4FinalStateElasticChampion::G4FinalStateElasticChampion() |
---|
| 36 | { |
---|
| 37 | G4ParticleDefinition* electronDef = G4Electron::ElectronDefinition(); |
---|
| 38 | |
---|
| 39 | lowEnergyLimit = 8.23* eV; // SI : i/o of 7. * eV; |
---|
| 40 | highEnergyLimit = 10. * keV; |
---|
| 41 | |
---|
| 42 | G4double scaleFactor = 1e-16*cm*cm; |
---|
| 43 | |
---|
| 44 | char *path = getenv("G4LEDATA"); |
---|
| 45 | |
---|
| 46 | if (!path) |
---|
| 47 | G4Exception("G4FinalStateElasticChampion: constructor: G4LEDATA environment variable not set"); |
---|
| 48 | |
---|
| 49 | if (electronDef != 0) |
---|
| 50 | { |
---|
| 51 | std::ostringstream eFullFileName; |
---|
| 52 | eFullFileName << path << "/dna/sigmadiff_elastic_e_champion.dat"; |
---|
| 53 | std::ifstream eDiffCrossSection(eFullFileName.str().c_str()); |
---|
| 54 | |
---|
| 55 | if (!eDiffCrossSection) G4Exception("G4FinalStateElasticChampion: constructor: error opening electron DATA FILE"); |
---|
| 56 | |
---|
| 57 | eTdummyVec.push_back(0.); |
---|
| 58 | |
---|
| 59 | while(!eDiffCrossSection.eof()) |
---|
| 60 | { |
---|
| 61 | double tDummy; |
---|
| 62 | double eDummy; |
---|
| 63 | eDiffCrossSection>>tDummy>>eDummy; |
---|
| 64 | |
---|
| 65 | // SI : mandatory eVecm initialization |
---|
| 66 | if (tDummy != eTdummyVec.back()) |
---|
| 67 | { |
---|
| 68 | eTdummyVec.push_back(tDummy); |
---|
| 69 | eVecm[tDummy].push_back(0.); |
---|
| 70 | } |
---|
| 71 | |
---|
| 72 | eDiffCrossSection>>eDiffCrossSectionData[0][tDummy][eDummy]; |
---|
| 73 | |
---|
| 74 | // SI : only if not end of file reached ! |
---|
| 75 | if (!eDiffCrossSection.eof()) eDiffCrossSectionData[0][tDummy][eDummy]*=scaleFactor; |
---|
| 76 | |
---|
| 77 | if (eDummy != eVecm[tDummy].back()) eVecm[tDummy].push_back(eDummy); |
---|
| 78 | |
---|
| 79 | } |
---|
| 80 | |
---|
| 81 | } |
---|
| 82 | else |
---|
| 83 | { |
---|
| 84 | G4Exception("G4FinalStateElastiChampion : constructor: electron is not defined"); |
---|
| 85 | } |
---|
| 86 | } |
---|
| 87 | |
---|
| 88 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
| 89 | |
---|
| 90 | G4FinalStateElasticChampion::~G4FinalStateElasticChampion() |
---|
| 91 | { |
---|
| 92 | eVecm.clear(); |
---|
| 93 | } |
---|
| 94 | |
---|
| 95 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
| 96 | |
---|
| 97 | const G4FinalStateProduct& G4FinalStateElasticChampion::GenerateFinalState(const G4Track& track, const G4Step& ) |
---|
| 98 | { |
---|
| 99 | product.Clear(); |
---|
| 100 | |
---|
| 101 | G4double k = track.GetDynamicParticle()->GetKineticEnergy(); |
---|
| 102 | |
---|
| 103 | if (k>= lowEnergyLimit && k < highEnergyLimit) |
---|
| 104 | { |
---|
| 105 | G4double cosTheta = RandomizeCosTheta(k); |
---|
| 106 | |
---|
| 107 | G4double phi = 2. * pi * G4UniformRand(); |
---|
| 108 | |
---|
| 109 | G4ThreeVector zVers = track.GetDynamicParticle()->GetMomentumDirection(); |
---|
| 110 | G4ThreeVector xVers = zVers.orthogonal(); |
---|
| 111 | G4ThreeVector yVers = zVers.cross(xVers); |
---|
| 112 | |
---|
| 113 | G4double xDir = std::sqrt(1. - cosTheta*cosTheta); |
---|
| 114 | G4double yDir = xDir; |
---|
| 115 | xDir *= std::cos(phi); |
---|
| 116 | yDir *= std::sin(phi); |
---|
| 117 | |
---|
| 118 | G4ThreeVector zPrimeVers((xDir*xVers + yDir*yVers + cosTheta*zVers)); |
---|
| 119 | |
---|
| 120 | product.ModifyPrimaryParticle(zPrimeVers,k); |
---|
| 121 | } |
---|
| 122 | |
---|
| 123 | if (k<lowEnergyLimit) |
---|
| 124 | { |
---|
| 125 | product.KillPrimaryParticle(); |
---|
| 126 | } |
---|
| 127 | |
---|
| 128 | return product; |
---|
| 129 | } |
---|
| 130 | |
---|
| 131 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
| 132 | |
---|
| 133 | G4double G4FinalStateElasticChampion::DifferentialCrossSection |
---|
| 134 | (G4ParticleDefinition * particleDefinition, G4double k, G4double theta) |
---|
| 135 | { |
---|
| 136 | G4double sigma = 0.; |
---|
| 137 | G4double valueT1 = 0; |
---|
| 138 | G4double valueT2 = 0; |
---|
| 139 | G4double valueE21 = 0; |
---|
| 140 | G4double valueE22 = 0; |
---|
| 141 | G4double valueE12 = 0; |
---|
| 142 | G4double valueE11 = 0; |
---|
| 143 | G4double xs11 = 0; |
---|
| 144 | G4double xs12 = 0; |
---|
| 145 | G4double xs21 = 0; |
---|
| 146 | G4double xs22 = 0; |
---|
| 147 | |
---|
| 148 | //SI : ensure the correct computation of cross section at the 180*deg limit |
---|
| 149 | if (theta==180.) theta=theta-1e-9; |
---|
| 150 | |
---|
| 151 | if (particleDefinition == G4Electron::ElectronDefinition()) |
---|
| 152 | { |
---|
| 153 | std::vector<double>::iterator t2 = std::upper_bound(eTdummyVec.begin(),eTdummyVec.end(), k); |
---|
| 154 | std::vector<double>::iterator t1 = t2-1; |
---|
| 155 | |
---|
| 156 | std::vector<double>::iterator e12 = std::upper_bound(eVecm[(*t1)].begin(),eVecm[(*t1)].end(), theta); |
---|
| 157 | std::vector<double>::iterator e11 = e12-1; |
---|
| 158 | |
---|
| 159 | std::vector<double>::iterator e22 = std::upper_bound(eVecm[(*t2)].begin(),eVecm[(*t2)].end(), theta); |
---|
| 160 | std::vector<double>::iterator e21 = e22-1; |
---|
| 161 | |
---|
| 162 | valueT1 =*t1; |
---|
| 163 | valueT2 =*t2; |
---|
| 164 | valueE21 =*e21; |
---|
| 165 | valueE22 =*e22; |
---|
| 166 | valueE12 =*e12; |
---|
| 167 | valueE11 =*e11; |
---|
| 168 | |
---|
| 169 | xs11 = eDiffCrossSectionData[0][valueT1][valueE11]; |
---|
| 170 | xs12 = eDiffCrossSectionData[0][valueT1][valueE12]; |
---|
| 171 | xs21 = eDiffCrossSectionData[0][valueT2][valueE21]; |
---|
| 172 | xs22 = eDiffCrossSectionData[0][valueT2][valueE22]; |
---|
| 173 | } |
---|
| 174 | |
---|
| 175 | G4double xsProduct = xs11 * xs12 * xs21 * xs22; |
---|
| 176 | |
---|
| 177 | if (xs11==0 || xs12==0 ||xs21==0 ||xs22==0) return (0.); |
---|
| 178 | |
---|
| 179 | if (xsProduct != 0.) |
---|
| 180 | { |
---|
| 181 | sigma = QuadInterpolator( valueE11, valueE12, |
---|
| 182 | valueE21, valueE22, |
---|
| 183 | xs11, xs12, |
---|
| 184 | xs21, xs22, |
---|
| 185 | valueT1, valueT2, |
---|
| 186 | k, theta ); |
---|
| 187 | } |
---|
| 188 | |
---|
| 189 | return sigma; |
---|
| 190 | } |
---|
| 191 | |
---|
| 192 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
| 193 | |
---|
| 194 | G4double G4FinalStateElasticChampion::LinLogInterpolate(G4double e1, |
---|
| 195 | G4double e2, |
---|
| 196 | G4double e, |
---|
| 197 | G4double xs1, |
---|
| 198 | G4double xs2) |
---|
| 199 | { |
---|
| 200 | G4double d1 = std::log(xs1); |
---|
| 201 | G4double d2 = std::log(xs2); |
---|
| 202 | G4double value = std::exp(d1 + (d2 - d1)*(e - e1)/ (e2 - e1)); |
---|
| 203 | return value; |
---|
| 204 | } |
---|
| 205 | |
---|
| 206 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
| 207 | |
---|
| 208 | G4double G4FinalStateElasticChampion::LogLogInterpolate(G4double e1, |
---|
| 209 | G4double e2, |
---|
| 210 | G4double e, |
---|
| 211 | G4double xs1, |
---|
| 212 | G4double xs2) |
---|
| 213 | { |
---|
| 214 | G4double a = (std::log10(xs2)-std::log10(xs1)) / (std::log10(e2)-std::log10(e1)); |
---|
| 215 | G4double b = std::log10(xs2) - a*std::log10(e2); |
---|
| 216 | G4double sigma = a*std::log10(e) + b; |
---|
| 217 | G4double value = (std::pow(10.,sigma)); |
---|
| 218 | return value; |
---|
| 219 | } |
---|
| 220 | |
---|
| 221 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
| 222 | |
---|
| 223 | G4double G4FinalStateElasticChampion::QuadInterpolator(G4double e11, G4double e12, |
---|
| 224 | G4double e21, G4double e22, |
---|
| 225 | G4double xs11, G4double xs12, |
---|
| 226 | G4double xs21, G4double xs22, |
---|
| 227 | G4double t1, G4double t2, |
---|
| 228 | G4double t, G4double e) |
---|
| 229 | { |
---|
| 230 | // Log-Log |
---|
| 231 | /* |
---|
| 232 | G4double interpolatedvalue1 = LogLogInterpolate(e11, e12, e, xs11, xs12); |
---|
| 233 | G4double interpolatedvalue2 = LogLogInterpolate(e21, e22, e, xs21, xs22); |
---|
| 234 | G4double value = LogLogInterpolate(t1, t2, t, interpolatedvalue1, interpolatedvalue2); |
---|
| 235 | */ |
---|
| 236 | |
---|
| 237 | // Lin-Log |
---|
| 238 | G4double interpolatedvalue1 = LinLogInterpolate(e11, e12, e, xs11, xs12); |
---|
| 239 | G4double interpolatedvalue2 = LinLogInterpolate(e21, e22, e, xs21, xs22); |
---|
| 240 | G4double value = LinLogInterpolate(t1, t2, t, interpolatedvalue1, interpolatedvalue2); |
---|
| 241 | return value; |
---|
| 242 | } |
---|
| 243 | |
---|
| 244 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
| 245 | |
---|
| 246 | G4double G4FinalStateElasticChampion::RandomizeCosTheta(G4double k) |
---|
| 247 | { |
---|
| 248 | |
---|
| 249 | G4double cosTheta = -1; |
---|
| 250 | G4double cumul = 0; |
---|
| 251 | G4double value = 0; |
---|
| 252 | |
---|
| 253 | // Number of integration steps in the 0-180 deg range |
---|
| 254 | G4int iMax=180; |
---|
| 255 | |
---|
| 256 | G4double random = G4UniformRand(); |
---|
| 257 | |
---|
| 258 | // Cumulate differential cross section |
---|
| 259 | for (G4int i=0; i<iMax; i++) |
---|
| 260 | { |
---|
| 261 | cumul = cumul + DifferentialCrossSection(G4Electron::ElectronDefinition(),k/eV,G4double(i)*180./(iMax-1)); |
---|
| 262 | } |
---|
| 263 | |
---|
| 264 | // Select theta angle |
---|
| 265 | for (G4int i=0; i<iMax; i++) |
---|
| 266 | { |
---|
| 267 | value = value + DifferentialCrossSection(G4Electron::ElectronDefinition(),k/eV,G4double(i)*180./(iMax-1)) / cumul; |
---|
| 268 | if (random < value) |
---|
| 269 | { |
---|
| 270 | cosTheta=std::cos( deg*G4double(i)*180./(iMax-1) ); |
---|
| 271 | break; |
---|
| 272 | } |
---|
| 273 | } |
---|
| 274 | |
---|
| 275 | return cosTheta; |
---|
| 276 | } |
---|