[1058] | 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: G4GoudsmitSaundersonMscModel.cc,v 1.7 2009/04/20 19:22:29 vnivanch Exp $ |
---|
| 27 | // GEANT4 tag $Name: geant4-09-03-beta-cand-01 $ |
---|
| 28 | // |
---|
| 29 | // ------------------------------------------------------------------- |
---|
| 30 | // |
---|
| 31 | // GEANT4 Class file |
---|
| 32 | // |
---|
| 33 | // File name: G4GoudsmitSaundersonMscModel |
---|
| 34 | // |
---|
| 35 | // Author: Omrane Kadri |
---|
| 36 | // |
---|
| 37 | // Creation date: 20.02.2009 |
---|
| 38 | // |
---|
| 39 | // Modifications: |
---|
| 40 | // 04.03.2009 V.Ivanchenko cleanup and format according to Geant4 EM style |
---|
| 41 | // |
---|
| 42 | // 15.04.2009 O.Kadri: cleanup: discard no scattering and single scattering theta |
---|
| 43 | // sampling from SampleCosineTheta() which means the splitting |
---|
| 44 | // step into two sub-steps occur only for msc regime |
---|
| 45 | // |
---|
| 46 | |
---|
| 47 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
---|
| 48 | //REFERENCES: |
---|
| 49 | //Ref.1:E. Benedito et al.,"Mixed simulation ... cross-sections", NIMB 174 (2001) pp 91-110; |
---|
| 50 | //Ref.2:I. Kawrakow et al.,"On the condensed ... transport",NIMB 142 (1998) pp 253-280; |
---|
| 51 | //Ref.3:I. Kawrakow et al.,"On the representation ... calculations",NIMB 134 (1998) pp 325-336; |
---|
| 52 | //Ref.4:Bielajew et al.,".....", NIMB 173 (2001) 332-343; |
---|
| 53 | //Ref.5:F. Salvat et al.,"ELSEPA--Dirac partial ...molecules", Comp.Phys.Comm.165 (2005) pp 157-190; |
---|
| 54 | //Ref.6:G4UrbanMscModel G4_v9.1Ref09; |
---|
| 55 | //Ref.7:G4eCoulombScatteringModel G4_v9.1Ref09. |
---|
| 56 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
---|
| 57 | |
---|
| 58 | #include "G4GoudsmitSaundersonMscModel.hh" |
---|
| 59 | #include "G4GoudsmitSaundersonTable.hh" |
---|
| 60 | |
---|
| 61 | #include "G4ParticleChangeForMSC.hh" |
---|
| 62 | #include "G4MaterialCutsCouple.hh" |
---|
| 63 | #include "G4DynamicParticle.hh" |
---|
| 64 | #include "G4DataInterpolation.hh" |
---|
| 65 | #include "G4Electron.hh" |
---|
| 66 | #include "G4Positron.hh" |
---|
| 67 | |
---|
| 68 | #include "G4LossTableManager.hh" |
---|
| 69 | #include "G4Track.hh" |
---|
| 70 | #include "G4PhysicsTable.hh" |
---|
| 71 | #include "Randomize.hh" |
---|
| 72 | #include "G4Poisson.hh" |
---|
| 73 | |
---|
| 74 | using namespace std; |
---|
| 75 | |
---|
| 76 | G4double G4GoudsmitSaundersonMscModel::ener[] = {-1.}; |
---|
| 77 | G4double G4GoudsmitSaundersonMscModel::TCSE[103][106] ; |
---|
| 78 | G4double G4GoudsmitSaundersonMscModel::FTCSE[103][106] ; |
---|
| 79 | G4double G4GoudsmitSaundersonMscModel::TCSP[103][106] ; |
---|
| 80 | G4double G4GoudsmitSaundersonMscModel::FTCSP[103][106] ; |
---|
| 81 | |
---|
| 82 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
---|
| 83 | G4GoudsmitSaundersonMscModel::G4GoudsmitSaundersonMscModel(const G4String& nam) |
---|
| 84 | : G4VMscModel(nam),lowKEnergy(0.1*keV),highKEnergy(GeV),isInitialized(false) |
---|
| 85 | { |
---|
| 86 | fr=0.02,rangeinit=0.,masslimite=0.6*MeV; |
---|
| 87 | particle=0;tausmall=1.e-16;taulim=1.e-6;tlimit=1.e10*mm; |
---|
| 88 | tlimitmin=10.e-6*mm;geombig=1.e50*mm;geommin=1.e-3*mm,tgeom=geombig; |
---|
| 89 | tlimitminfix=1.e-6*mm;stepmin=tlimitminfix;lambdalimit=1.*mm;smallstep=1.e10; |
---|
| 90 | theManager=G4LossTableManager::Instance(); |
---|
| 91 | inside=false;insideskin=false; |
---|
| 92 | samplez=false; |
---|
| 93 | |
---|
| 94 | GSTable = new G4GoudsmitSaundersonTable(); |
---|
| 95 | |
---|
| 96 | if(ener[0] < 0.0){ |
---|
| 97 | G4cout << "### G4GoudsmitSaundersonMscModel loading ELSEPA data" << G4endl; |
---|
| 98 | LoadELSEPAXSections(); |
---|
| 99 | } |
---|
| 100 | } |
---|
| 101 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
---|
| 102 | G4GoudsmitSaundersonMscModel::~G4GoudsmitSaundersonMscModel() |
---|
| 103 | { |
---|
| 104 | delete GSTable; |
---|
| 105 | } |
---|
| 106 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
---|
| 107 | void G4GoudsmitSaundersonMscModel::Initialise(const G4ParticleDefinition* p, |
---|
| 108 | const G4DataVector&) |
---|
| 109 | { |
---|
| 110 | skindepth=skin*stepmin; |
---|
| 111 | SetParticle(p); |
---|
| 112 | if(isInitialized) return; |
---|
| 113 | fParticleChange = GetParticleChangeForMSC(); |
---|
| 114 | InitialiseSafetyHelper(); |
---|
| 115 | isInitialized=true; |
---|
| 116 | } |
---|
| 117 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
---|
| 118 | |
---|
| 119 | G4double G4GoudsmitSaundersonMscModel::ComputeCrossSectionPerAtom(const G4ParticleDefinition* p, |
---|
| 120 | G4double kineticEnergy,G4double Z, G4double, G4double, G4double) |
---|
| 121 | { |
---|
| 122 | //Build cross section table : Taken from Ref.7 |
---|
| 123 | G4double cs=0.0; |
---|
| 124 | G4double kinEnergy = kineticEnergy; |
---|
| 125 | if(kinEnergy<lowKEnergy) kinEnergy=lowKEnergy; |
---|
| 126 | if(kinEnergy>highKEnergy)kinEnergy=highKEnergy; |
---|
| 127 | |
---|
| 128 | //value0=Lambda0;value1=Lambda1 |
---|
| 129 | G4double value0,value1; |
---|
| 130 | CalculateIntegrals(p,Z,kinEnergy,value0,value1); |
---|
| 131 | |
---|
| 132 | if(value1 > 0.0) cs = 1./value1; |
---|
| 133 | |
---|
| 134 | return cs; |
---|
| 135 | } |
---|
| 136 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
---|
| 137 | |
---|
| 138 | void G4GoudsmitSaundersonMscModel::SampleScattering(const G4DynamicParticle* dynParticle, |
---|
| 139 | G4double safety) |
---|
| 140 | { |
---|
| 141 | G4double kineticEnergy = dynParticle->GetKineticEnergy(); |
---|
| 142 | if((kineticEnergy <= 0.0) || (tPathLength <= tlimitminfix)) return ; |
---|
| 143 | |
---|
| 144 | G4double cosTheta1,sinTheta1,cosTheta2,sinTheta2; |
---|
| 145 | G4double phi1,phi2,cosPhi1=1.0,sinPhi1=0.0,cosPhi2=1.0,sinPhi2=0.0; |
---|
| 146 | G4double q1,Gamma,Eta,delta,nu,nu0,nu1,nu2,nu_interm; |
---|
| 147 | |
---|
| 148 | /////////////////////////////////////////// |
---|
| 149 | // Effective energy and path-length from Eq. 4.7.15+16 of Ref.4 |
---|
| 150 | G4double eloss = theManager->GetEnergy(particle,tPathLength,currentCouple); |
---|
| 151 | if(eloss>0.5*kineticEnergy)return; |
---|
| 152 | G4double ee = kineticEnergy - 0.5*eloss; |
---|
| 153 | G4double ttau = ee/electron_mass_c2; |
---|
| 154 | G4double ttau2 = ttau*ttau; |
---|
| 155 | G4double epsilonpp= eloss/ee; |
---|
| 156 | G4double temp2 = 0.166666*(4+ttau*(6+ttau*(7+ttau*(4+ttau))))*(epsilonpp/(ttau+1)/(ttau+2))*(epsilonpp/(ttau+1)/(ttau+2)); |
---|
| 157 | G4double cst1=epsilonpp*epsilonpp*(6+10*ttau+5*ttau2)/(24*ttau2+48*ttau+72); |
---|
| 158 | |
---|
| 159 | kineticEnergy *= (1 - cst1); |
---|
| 160 | tPathLength *= (1 - temp2); |
---|
| 161 | /////////////////////////////////////////// |
---|
| 162 | // additivity rule for mixture xsection calculation |
---|
| 163 | const G4Material* mat = currentCouple->GetMaterial(); |
---|
| 164 | G4int nelm = mat->GetNumberOfElements(); |
---|
| 165 | const G4ElementVector* theElementVector = mat->GetElementVector(); |
---|
| 166 | const G4double* theFraction = mat->GetFractionVector(); |
---|
| 167 | G4double atomPerVolume = mat->GetTotNbOfAtomsPerVolume(); |
---|
| 168 | G4double scrA,llambda0,llambda1; |
---|
| 169 | scrA=0.0;llambda0 =0.;llambda1=0.; |
---|
| 170 | for(G4int i=0;i<nelm;i++) |
---|
| 171 | { |
---|
| 172 | G4double l0,l1; |
---|
| 173 | CalculateIntegrals(particle,(*theElementVector)[i]->GetZ(),kineticEnergy,l0,l1); |
---|
| 174 | llambda0 += (theFraction[i]/l0); |
---|
| 175 | llambda1 += (theFraction[i]/l1); |
---|
| 176 | } |
---|
| 177 | if(llambda0>DBL_MIN)llambda0 =1./llambda0; |
---|
| 178 | if(llambda1>DBL_MIN)llambda1 =1./llambda1; |
---|
| 179 | G4double g1=llambda0/llambda1; |
---|
| 180 | G4double x1,x0; |
---|
| 181 | |
---|
| 182 | x0=g1/2.; |
---|
| 183 | do |
---|
| 184 | { |
---|
| 185 | x1 = x0-(x0*((1.+x0)*std::log(1.+1./x0)-1.0)-g1/2.)/( (1.+2.*x0)*std::log(1.+1./x0)-2.0);// x1=x0-f(x0)/f'(x0) |
---|
| 186 | delta = std::abs( x1 - x0 ); |
---|
| 187 | x0 = x1; // new approximation becomes the old approximation for the next iteration |
---|
| 188 | } while (delta > 1e-10); |
---|
| 189 | scrA = x1; |
---|
| 190 | |
---|
| 191 | G4double us=0.0,vs=0.0,ws=1.0,x_coord=0.0,y_coord=0.0,z_coord=1.0; |
---|
| 192 | G4double lambdan=0.; |
---|
| 193 | if(llambda0>0.)lambdan=atomPerVolume*tPathLength/llambda0; |
---|
| 194 | if((lambdan<=1.0e-12)||(lambdan>1.0e+5))return; |
---|
| 195 | G4bool noscatt=false; |
---|
| 196 | G4bool singlescatt=false; |
---|
| 197 | G4bool mscatt=false; |
---|
| 198 | |
---|
| 199 | G4double epsilon1=G4UniformRand(); |
---|
| 200 | if(epsilon1<(exp(-lambdan)))noscatt=true;// no scattering |
---|
| 201 | else if(epsilon1<((1.+lambdan)*exp(-lambdan)))//single scattering |
---|
| 202 | {singlescatt=true; |
---|
| 203 | ws=G4UniformRand(); |
---|
| 204 | ws= 1.-2.*scrA*ws/(1.-ws + scrA); |
---|
| 205 | G4double phi0=twopi*G4UniformRand(); |
---|
| 206 | us=sqrt(1.-ws*ws)*cos(phi0); |
---|
| 207 | vs=sqrt(1.-ws*ws)*sin(phi0); |
---|
| 208 | G4double rr=G4UniformRand(); |
---|
| 209 | x_coord=(rr*us); |
---|
| 210 | y_coord=(rr*vs); |
---|
| 211 | z_coord=((1.-rr)+rr*ws); |
---|
| 212 | } |
---|
| 213 | else |
---|
| 214 | {mscatt=true; |
---|
| 215 | // Ref.2 subsection 4.4 "The best solution found" |
---|
| 216 | // Sample first substep scattering angle |
---|
| 217 | SampleCosineTheta(0.5*lambdan,scrA,cosTheta1,sinTheta1); |
---|
| 218 | phi1 = twopi*G4UniformRand(); |
---|
| 219 | cosPhi1 = cos(phi1); |
---|
| 220 | sinPhi1 = sin(phi1); |
---|
| 221 | |
---|
| 222 | // Sample second substep scattering angle |
---|
| 223 | SampleCosineTheta(0.5*lambdan,scrA,cosTheta2,sinTheta2); |
---|
| 224 | phi2 = twopi*G4UniformRand(); |
---|
| 225 | cosPhi2 = cos(phi2); |
---|
| 226 | sinPhi2 = sin(phi2); |
---|
| 227 | |
---|
| 228 | // Scattering direction |
---|
| 229 | us = sinTheta2*(cosTheta1*cosPhi1*cosPhi2 - sinPhi1*sinPhi2) + cosTheta2*sinTheta1*cosPhi1; |
---|
| 230 | vs = sinTheta2*(cosTheta1*sinPhi1*cosPhi2 + cosPhi1*sinPhi2) + cosTheta2*sinTheta1*sinPhi1; |
---|
| 231 | ws = cosTheta1*cosTheta2 - sinTheta1*sinTheta2*cosPhi2; |
---|
| 232 | } |
---|
| 233 | G4ThreeVector oldDirection = dynParticle->GetMomentumDirection(); |
---|
| 234 | G4ThreeVector newDirection(us,vs,ws); |
---|
| 235 | newDirection.rotateUz(oldDirection); |
---|
| 236 | fParticleChange->ProposeMomentumDirection(newDirection); |
---|
| 237 | |
---|
| 238 | if((safety > tlimitminfix)&&(latDisplasment)) |
---|
| 239 | { |
---|
| 240 | // Scattering coordinates |
---|
| 241 | if(mscatt) |
---|
| 242 | { |
---|
| 243 | if(scrA<DBL_MIN)scrA=DBL_MIN; |
---|
| 244 | q1 = 2.*scrA*((1. + scrA)*log(1. + 1./scrA) - 1.); |
---|
| 245 | if(q1<DBL_MIN)q1=DBL_MIN; |
---|
| 246 | Gamma = 6.*scrA*(1. + scrA)*((1. + 2.*scrA)*log(1. + 1./scrA) - 2.)/q1; |
---|
| 247 | Eta = atomPerVolume*tPathLength/llambda1; |
---|
| 248 | delta = 0.90824829 - Eta*(0.102062073-Gamma*0.026374715); |
---|
| 249 | |
---|
| 250 | nu = G4UniformRand(); |
---|
| 251 | nu = std::sqrt(nu); |
---|
| 252 | nu0 = (1.0 - nu)/2.; |
---|
| 253 | nu1 = nu*delta; |
---|
| 254 | nu2 = nu*(1.0-delta); |
---|
| 255 | nu_interm = 1.0 - nu0 - nu1 - nu2; |
---|
| 256 | x_coord=(nu1*sinTheta1*cosPhi1+nu2*sinTheta2*(cosPhi1*cosPhi2-cosTheta1*sinPhi1*sinPhi2)+nu_interm*us); |
---|
| 257 | y_coord=(nu1*sinTheta1*sinPhi1+nu2*sinTheta2*(sinPhi1*cosPhi2+cosTheta1*cosPhi1*sinPhi2)+nu_interm*vs); |
---|
| 258 | z_coord=(nu0+nu1*cosTheta1+nu2*cosTheta2+ nu_interm*ws) ; |
---|
| 259 | } |
---|
| 260 | G4double r=sqrt(x_coord*x_coord+y_coord*y_coord+z_coord*z_coord); |
---|
| 261 | |
---|
| 262 | G4double check= 1.- tPathLength/zPathLength; |
---|
| 263 | if(check<=0.) return; |
---|
| 264 | else if(r>check) {r=check;x_coord /=r;y_coord /=r;z_coord /=r;} |
---|
| 265 | |
---|
| 266 | r *=tPathLength; |
---|
| 267 | |
---|
| 268 | if(r > tlimitminfix) { |
---|
| 269 | |
---|
| 270 | G4ThreeVector latDirection = G4ThreeVector(x_coord*tPathLength,y_coord*tPathLength,z_coord*tPathLength); |
---|
| 271 | latDirection.rotateUz(oldDirection); |
---|
| 272 | |
---|
| 273 | ComputeDisplacement(fParticleChange, latDirection, r, safety); |
---|
| 274 | } |
---|
| 275 | } |
---|
| 276 | } |
---|
| 277 | |
---|
| 278 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
---|
| 279 | void G4GoudsmitSaundersonMscModel::SampleCosineTheta(G4double lambdan, G4double scrA, |
---|
| 280 | G4double &cost, G4double &sint) |
---|
| 281 | { |
---|
| 282 | G4double u,Qn1,r1,tet; |
---|
| 283 | G4double xi=0.; |
---|
| 284 | Qn1=2.* lambdan *scrA*((1.+scrA)*log(1.+1./scrA)-1.); |
---|
| 285 | |
---|
| 286 | if((lambdan<1.)||(Qn1<0.001))//plural scatt. or small angle scatt. |
---|
| 287 | { |
---|
| 288 | G4double xi1,lambdai=0.; |
---|
| 289 | G4int i=0; |
---|
| 290 | do {xi1=G4UniformRand(); |
---|
| 291 | lambdai -=std::log(xi1); |
---|
| 292 | xi +=2.*scrA*xi1/(1.-xi1 + scrA); |
---|
| 293 | i++; |
---|
| 294 | }while((lambdai<lambdan)&&(i<30)); |
---|
| 295 | |
---|
| 296 | } |
---|
| 297 | else { |
---|
| 298 | if(Qn1>0.5)xi=2.*G4UniformRand();//isotropic distribution |
---|
| 299 | else{// procedure described by Benedito in Ref.1 |
---|
| 300 | do{r1=G4UniformRand(); |
---|
| 301 | u=GSTable->SampleTheta(lambdan,scrA,G4UniformRand()); |
---|
| 302 | xi = 2.*u; |
---|
| 303 | tet=acos(1.-xi); |
---|
| 304 | }while(tet*r1*r1>sin(tet)); |
---|
| 305 | } |
---|
| 306 | } |
---|
| 307 | |
---|
| 308 | |
---|
| 309 | if(xi<0.)xi=0.; |
---|
| 310 | if(xi>2.)xi=2.; |
---|
| 311 | cost=(1. - xi); |
---|
| 312 | sint=sqrt(xi*(2.-xi)); |
---|
| 313 | |
---|
| 314 | } |
---|
| 315 | |
---|
| 316 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
---|
| 317 | // Cubic spline log-log interpolation of Lambda0 and Lambda1 |
---|
| 318 | // Screening parameter calculated according to Eq. 37 of Ref.1 |
---|
| 319 | void G4GoudsmitSaundersonMscModel::CalculateIntegrals(const G4ParticleDefinition* p,G4double Z, |
---|
| 320 | G4double kinEnergy,G4double &Lam0, |
---|
| 321 | G4double &Lam1) |
---|
| 322 | { |
---|
| 323 | //////// BEGIN OF: LAMBDA CALCULATION //////////////////////////////// |
---|
| 324 | G4double TCSEForThisAtom[106],FTCSEForThisAtom[106],TCSPForThisAtom[106],FTCSPForThisAtom[106]; |
---|
| 325 | G4double summ00=0.0; |
---|
| 326 | G4double summ10=0.0; |
---|
| 327 | G4double InterpolatedValue=0.0; |
---|
| 328 | |
---|
| 329 | |
---|
| 330 | G4int iZ = G4int(Z); |
---|
| 331 | if(iZ > 103) iZ = 103; |
---|
| 332 | for(G4int i=0;i<106;i++) |
---|
| 333 | { |
---|
| 334 | TCSEForThisAtom[i]=TCSE[iZ-1][i];FTCSEForThisAtom[i]=FTCSE[iZ-1][i]; |
---|
| 335 | TCSPForThisAtom[i]=TCSP[iZ-1][i];FTCSPForThisAtom[i]=FTCSP[iZ-1][i]; |
---|
| 336 | } |
---|
| 337 | |
---|
| 338 | G4double kineticE = kinEnergy; |
---|
| 339 | if(kineticE<lowKEnergy)kineticE=lowKEnergy; |
---|
| 340 | if(kineticE>highKEnergy)kineticE=highKEnergy; |
---|
| 341 | kineticE /= eV; |
---|
| 342 | |
---|
| 343 | if(p==G4Electron::Electron()) |
---|
| 344 | { |
---|
| 345 | MyValue= new G4DataInterpolation(ener,TCSEForThisAtom,106,0.0,0); |
---|
| 346 | InterpolatedValue = MyValue ->CubicSplineInterpolation(std::log(kineticE)); |
---|
| 347 | delete MyValue; |
---|
| 348 | summ00 = std::exp(InterpolatedValue); |
---|
| 349 | MyValue= new G4DataInterpolation(ener,FTCSEForThisAtom,106,0.0,0); |
---|
| 350 | InterpolatedValue = MyValue ->CubicSplineInterpolation(std::log(kineticE)); |
---|
| 351 | delete MyValue; |
---|
| 352 | summ10 = std::exp(InterpolatedValue); |
---|
| 353 | } |
---|
| 354 | if(p==G4Positron::Positron()) |
---|
| 355 | { |
---|
| 356 | MyValue= new G4DataInterpolation(ener,TCSPForThisAtom,106,0.0,0); |
---|
| 357 | InterpolatedValue = MyValue ->CubicSplineInterpolation(std::log(kineticE)); |
---|
| 358 | delete MyValue; |
---|
| 359 | summ00 = std::exp(InterpolatedValue); |
---|
| 360 | MyValue= new G4DataInterpolation(ener,FTCSPForThisAtom,106,0.0,0); |
---|
| 361 | InterpolatedValue = MyValue ->CubicSplineInterpolation(std::log(kineticE)); |
---|
| 362 | delete MyValue; |
---|
| 363 | summ10 = std::exp(InterpolatedValue); |
---|
| 364 | } |
---|
| 365 | |
---|
| 366 | summ00 *=barn; |
---|
| 367 | summ10 *=barn; |
---|
| 368 | |
---|
| 369 | Lam0=1./((1.+1./Z)*summ00); |
---|
| 370 | Lam1=1./((1.+1./Z)*summ10); |
---|
| 371 | |
---|
| 372 | } |
---|
| 373 | |
---|
| 374 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
---|
| 375 | //t->g->t step transformations taken from Ref.6 |
---|
| 376 | G4double G4GoudsmitSaundersonMscModel::ComputeTruePathLengthLimit(const G4Track& track, |
---|
| 377 | G4PhysicsTable* theTable, |
---|
| 378 | G4double currentMinimalStep) |
---|
| 379 | { |
---|
| 380 | tPathLength = currentMinimalStep; |
---|
| 381 | G4StepPoint* sp = track.GetStep()->GetPreStepPoint(); |
---|
| 382 | G4StepStatus stepStatus = sp->GetStepStatus(); |
---|
| 383 | |
---|
| 384 | const G4DynamicParticle* dp = track.GetDynamicParticle(); |
---|
| 385 | |
---|
| 386 | if(stepStatus == fUndefined) { |
---|
| 387 | inside = false; |
---|
| 388 | insideskin = false; |
---|
| 389 | tlimit = geombig; |
---|
| 390 | SetParticle( dp->GetDefinition() ); |
---|
| 391 | } |
---|
| 392 | |
---|
| 393 | theLambdaTable = theTable; |
---|
| 394 | currentCouple = track.GetMaterialCutsCouple(); |
---|
| 395 | currentMaterialIndex = currentCouple->GetIndex(); |
---|
| 396 | currentKinEnergy = dp->GetKineticEnergy(); |
---|
| 397 | currentRange = |
---|
| 398 | theManager->GetRangeFromRestricteDEDX(particle,currentKinEnergy,currentCouple); |
---|
| 399 | |
---|
| 400 | lambda1 = GetLambda(currentKinEnergy); |
---|
| 401 | |
---|
| 402 | // stop here if small range particle |
---|
| 403 | if(inside) return tPathLength; |
---|
| 404 | |
---|
| 405 | if(tPathLength > currentRange) tPathLength = currentRange; |
---|
| 406 | |
---|
| 407 | G4double presafety = sp->GetSafety(); |
---|
| 408 | |
---|
| 409 | // far from geometry boundary |
---|
| 410 | if(currentRange < presafety) |
---|
| 411 | { |
---|
| 412 | inside = true; |
---|
| 413 | return tPathLength; |
---|
| 414 | } |
---|
| 415 | |
---|
| 416 | // standard version |
---|
| 417 | // |
---|
| 418 | if (steppingAlgorithm == fUseDistanceToBoundary) |
---|
| 419 | { |
---|
| 420 | //compute geomlimit and presafety |
---|
| 421 | G4double geomlimit = ComputeGeomLimit(track, presafety, tPathLength); |
---|
| 422 | |
---|
| 423 | // is far from boundary |
---|
| 424 | if(currentRange <= presafety) |
---|
| 425 | { |
---|
| 426 | inside = true; |
---|
| 427 | return tPathLength; |
---|
| 428 | } |
---|
| 429 | |
---|
| 430 | smallstep += 1.; |
---|
| 431 | insideskin = false; |
---|
| 432 | |
---|
| 433 | if((stepStatus == fGeomBoundary) || (stepStatus == fUndefined)) |
---|
| 434 | { |
---|
| 435 | rangeinit = currentRange; |
---|
| 436 | if(stepStatus == fUndefined) smallstep = 1.e10; |
---|
| 437 | else smallstep = 1.; |
---|
| 438 | |
---|
| 439 | // constraint from the geometry |
---|
| 440 | if((geomlimit < geombig) && (geomlimit > geommin)) |
---|
| 441 | { |
---|
| 442 | if(stepStatus == fGeomBoundary) |
---|
| 443 | tgeom = geomlimit/facgeom; |
---|
| 444 | else |
---|
| 445 | tgeom = 2.*geomlimit/facgeom; |
---|
| 446 | } |
---|
| 447 | else |
---|
| 448 | tgeom = geombig; |
---|
| 449 | |
---|
| 450 | //define stepmin here (it depends on lambda!) |
---|
| 451 | //rough estimation of lambda_elastic/lambda_transport |
---|
| 452 | G4double rat = currentKinEnergy/MeV ; |
---|
| 453 | rat = 1.e-3/(rat*(10.+rat)) ; |
---|
| 454 | //stepmin ~ lambda_elastic |
---|
| 455 | stepmin = rat*lambda1; |
---|
| 456 | skindepth = skin*stepmin; |
---|
| 457 | |
---|
| 458 | //define tlimitmin |
---|
| 459 | tlimitmin = 10.*stepmin; |
---|
| 460 | if(tlimitmin < tlimitminfix) tlimitmin = tlimitminfix; |
---|
| 461 | |
---|
| 462 | } |
---|
| 463 | |
---|
| 464 | //step limit |
---|
| 465 | tlimit = facrange*rangeinit; |
---|
| 466 | if(tlimit < facsafety*presafety) |
---|
| 467 | tlimit = facsafety*presafety; |
---|
| 468 | |
---|
| 469 | //lower limit for tlimit |
---|
| 470 | if(tlimit < tlimitmin) tlimit = tlimitmin; |
---|
| 471 | |
---|
| 472 | if(tlimit > tgeom) tlimit = tgeom; |
---|
| 473 | |
---|
| 474 | // shortcut |
---|
| 475 | if((tPathLength < tlimit) && (tPathLength < presafety) && |
---|
| 476 | (smallstep >= skin) && (tPathLength < geomlimit-0.999*skindepth)) |
---|
| 477 | return tPathLength; |
---|
| 478 | |
---|
| 479 | // step reduction near to boundary |
---|
| 480 | if(smallstep < skin) |
---|
| 481 | { |
---|
| 482 | tlimit = stepmin; |
---|
| 483 | insideskin = true; |
---|
| 484 | } |
---|
| 485 | else if(geomlimit < geombig) |
---|
| 486 | { |
---|
| 487 | if(geomlimit > skindepth) |
---|
| 488 | { |
---|
| 489 | if(tlimit > geomlimit-0.999*skindepth) |
---|
| 490 | tlimit = geomlimit-0.999*skindepth; |
---|
| 491 | } |
---|
| 492 | else |
---|
| 493 | { |
---|
| 494 | insideskin = true; |
---|
| 495 | if(tlimit > stepmin) tlimit = stepmin; |
---|
| 496 | } |
---|
| 497 | } |
---|
| 498 | |
---|
| 499 | if(tlimit < stepmin) tlimit = stepmin; |
---|
| 500 | |
---|
| 501 | if(tPathLength > tlimit) tPathLength = tlimit ; |
---|
| 502 | |
---|
| 503 | } |
---|
| 504 | // for 'normal' simulation with or without magnetic field |
---|
| 505 | // there no small step/single scattering at boundaries |
---|
| 506 | else if(steppingAlgorithm == fUseSafety) |
---|
| 507 | { |
---|
| 508 | // compute presafety again if presafety <= 0 and no boundary |
---|
| 509 | // i.e. when it is needed for optimization purposes |
---|
| 510 | if((stepStatus != fGeomBoundary) && (presafety < tlimitminfix)) |
---|
| 511 | presafety = ComputeSafety(sp->GetPosition(),tPathLength); |
---|
| 512 | |
---|
| 513 | // is far from boundary |
---|
| 514 | if(currentRange < presafety) |
---|
| 515 | { |
---|
| 516 | inside = true; |
---|
| 517 | return tPathLength; |
---|
| 518 | } |
---|
| 519 | |
---|
| 520 | if((stepStatus == fGeomBoundary) || (stepStatus == fUndefined)) |
---|
| 521 | { |
---|
| 522 | rangeinit = currentRange; |
---|
| 523 | fr = facrange; |
---|
| 524 | // 9.1 like stepping for e+/e- only (not for muons,hadrons) |
---|
| 525 | if(mass < masslimite) |
---|
| 526 | { |
---|
| 527 | if(lambda1 > currentRange) |
---|
| 528 | rangeinit = lambda1; |
---|
| 529 | if(lambda1 > lambdalimit) |
---|
| 530 | fr *= 0.75+0.25*lambda1/lambdalimit; |
---|
| 531 | } |
---|
| 532 | |
---|
| 533 | //lower limit for tlimit |
---|
| 534 | G4double rat = currentKinEnergy/MeV ; |
---|
| 535 | rat = 1.e-3/(rat*(10.+rat)) ; |
---|
| 536 | tlimitmin = 10.*lambda1*rat; |
---|
| 537 | if(tlimitmin < tlimitminfix) tlimitmin = tlimitminfix; |
---|
| 538 | } |
---|
| 539 | //step limit |
---|
| 540 | tlimit = fr*rangeinit; |
---|
| 541 | |
---|
| 542 | if(tlimit < facsafety*presafety) |
---|
| 543 | tlimit = facsafety*presafety; |
---|
| 544 | |
---|
| 545 | //lower limit for tlimit |
---|
| 546 | if(tlimit < tlimitmin) tlimit = tlimitmin; |
---|
| 547 | |
---|
| 548 | if(tPathLength > tlimit) tPathLength = tlimit; |
---|
| 549 | } |
---|
| 550 | |
---|
| 551 | // version similar to 7.1 (needed for some experiments) |
---|
| 552 | else |
---|
| 553 | { |
---|
| 554 | if (stepStatus == fGeomBoundary) |
---|
| 555 | { |
---|
| 556 | if (currentRange > lambda1) tlimit = facrange*currentRange; |
---|
| 557 | else tlimit = facrange*lambda1; |
---|
| 558 | |
---|
| 559 | if(tlimit < tlimitmin) tlimit = tlimitmin; |
---|
| 560 | if(tPathLength > tlimit) tPathLength = tlimit; |
---|
| 561 | } |
---|
| 562 | } |
---|
| 563 | return tPathLength ; |
---|
| 564 | } |
---|
| 565 | |
---|
| 566 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
---|
| 567 | G4double G4GoudsmitSaundersonMscModel::ComputeGeomPathLength(G4double) |
---|
| 568 | { |
---|
| 569 | par1 = -1. ; |
---|
| 570 | par2 = par3 = 0. ; |
---|
| 571 | |
---|
| 572 | // do the true -> geom transformation |
---|
| 573 | zPathLength = tPathLength; |
---|
| 574 | |
---|
| 575 | // z = t for very small tPathLength |
---|
| 576 | if(tPathLength < tlimitminfix) return zPathLength; |
---|
| 577 | |
---|
| 578 | // this correction needed to run MSC with eIoni and eBrem inactivated |
---|
| 579 | // and makes no harm for a normal run |
---|
| 580 | if(tPathLength > currentRange) |
---|
| 581 | tPathLength = currentRange ; |
---|
| 582 | |
---|
| 583 | G4double tau = tPathLength/lambda1 ; |
---|
| 584 | |
---|
| 585 | if ((tau <= tausmall) || insideskin) { |
---|
| 586 | zPathLength = tPathLength; |
---|
| 587 | if(zPathLength > lambda1) zPathLength = lambda1; |
---|
| 588 | return zPathLength; |
---|
| 589 | } |
---|
| 590 | |
---|
| 591 | G4double zmean = tPathLength; |
---|
| 592 | if (tPathLength < currentRange*dtrl) { |
---|
| 593 | if(tau < taulim) zmean = tPathLength*(1.-0.5*tau) ; |
---|
| 594 | else zmean = lambda1*(1.-exp(-tau)); |
---|
| 595 | } else if(currentKinEnergy < mass) { |
---|
| 596 | par1 = 1./currentRange ; |
---|
| 597 | par2 = 1./(par1*lambda1) ; |
---|
| 598 | par3 = 1.+par2 ; |
---|
| 599 | if(tPathLength < currentRange) |
---|
| 600 | zmean = (1.-exp(par3*log(1.-tPathLength/currentRange)))/(par1*par3) ; |
---|
| 601 | else |
---|
| 602 | zmean = 1./(par1*par3) ; |
---|
| 603 | } else { |
---|
| 604 | G4double T1 = theManager->GetEnergy(particle,currentRange-tPathLength,currentCouple); |
---|
| 605 | |
---|
| 606 | lambda11 = GetLambda(T1); |
---|
| 607 | |
---|
| 608 | par1 = (lambda1-lambda11)/(lambda1*tPathLength) ; |
---|
| 609 | par2 = 1./(par1*lambda1) ; |
---|
| 610 | par3 = 1.+par2 ; |
---|
| 611 | zmean = (1.-exp(par3*log(lambda11/lambda1)))/(par1*par3) ; |
---|
| 612 | } |
---|
| 613 | |
---|
| 614 | zPathLength = zmean ; |
---|
| 615 | // sample z |
---|
| 616 | if(samplez) |
---|
| 617 | { |
---|
| 618 | const G4double ztmax = 0.99, onethird = 1./3. ; |
---|
| 619 | G4double zt = zmean/tPathLength ; |
---|
| 620 | |
---|
| 621 | if (tPathLength > stepmin && zt < ztmax) |
---|
| 622 | { |
---|
| 623 | G4double u,cz1; |
---|
| 624 | if(zt >= onethird) |
---|
| 625 | { |
---|
| 626 | G4double cz = 0.5*(3.*zt-1.)/(1.-zt) ; |
---|
| 627 | cz1 = 1.+cz ; |
---|
| 628 | G4double u0 = cz/cz1 ; |
---|
| 629 | G4double grej ; |
---|
| 630 | do { |
---|
| 631 | u = exp(log(G4UniformRand())/cz1) ; |
---|
| 632 | grej = exp(cz*log(u/u0))*(1.-u)/(1.-u0) ; |
---|
| 633 | } while (grej < G4UniformRand()) ; |
---|
| 634 | } |
---|
| 635 | else |
---|
| 636 | { |
---|
| 637 | cz1 = 1./zt-1.; |
---|
| 638 | u = 1.-exp(log(G4UniformRand())/cz1) ; |
---|
| 639 | } |
---|
| 640 | zPathLength = tPathLength*u ; |
---|
| 641 | } |
---|
| 642 | } |
---|
| 643 | if(zPathLength > lambda1) zPathLength = lambda1; |
---|
| 644 | |
---|
| 645 | return zPathLength; |
---|
| 646 | } |
---|
| 647 | |
---|
| 648 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
---|
| 649 | |
---|
| 650 | G4double G4GoudsmitSaundersonMscModel::ComputeTrueStepLength(G4double geomStepLength) |
---|
| 651 | { |
---|
| 652 | // step defined other than transportation |
---|
| 653 | if(geomStepLength == zPathLength && tPathLength <= currentRange) |
---|
| 654 | return tPathLength; |
---|
| 655 | |
---|
| 656 | // t = z for very small step |
---|
| 657 | zPathLength = geomStepLength; |
---|
| 658 | tPathLength = geomStepLength; |
---|
| 659 | if(geomStepLength < tlimitminfix) return tPathLength; |
---|
| 660 | |
---|
| 661 | // recalculation |
---|
| 662 | if((geomStepLength > lambda1*tausmall) && !insideskin) |
---|
| 663 | { |
---|
| 664 | if(par1 < 0.) |
---|
| 665 | tPathLength = -lambda1*log(1.-geomStepLength/lambda1) ; |
---|
| 666 | else |
---|
| 667 | { |
---|
| 668 | if(par1*par3*geomStepLength < 1.) |
---|
| 669 | tPathLength = (1.-exp(log(1.-par1*par3*geomStepLength)/par3))/par1 ; |
---|
| 670 | else |
---|
| 671 | tPathLength = currentRange; |
---|
| 672 | } |
---|
| 673 | } |
---|
| 674 | if(tPathLength < geomStepLength) tPathLength = geomStepLength; |
---|
| 675 | |
---|
| 676 | return tPathLength; |
---|
| 677 | } |
---|
| 678 | |
---|
| 679 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
---|
| 680 | void G4GoudsmitSaundersonMscModel::LoadELSEPAXSections() |
---|
| 681 | { |
---|
| 682 | /////////////////////////////////////// |
---|
| 683 | //Total & first transport x sections of e-/e+ from ELSEPA code |
---|
| 684 | G4String filename = "XSECTIONS.dat"; |
---|
| 685 | |
---|
| 686 | char* path = getenv("G4LEDATA"); |
---|
| 687 | if (!path) |
---|
| 688 | { |
---|
| 689 | G4String excep = "G4GoudsmitSaundersonTable: G4LEDATA environment variable not set"; |
---|
| 690 | G4Exception(excep); |
---|
| 691 | } |
---|
| 692 | |
---|
| 693 | G4String pathString(path); |
---|
| 694 | G4String dirFile = pathString + "/msc_GS/" + filename; |
---|
| 695 | FILE *infile; |
---|
| 696 | infile = fopen(dirFile,"r"); |
---|
| 697 | if (infile == 0) |
---|
| 698 | { |
---|
| 699 | G4String excep = "G4GoudsmitSaunderson - data files: " + dirFile + " not found"; |
---|
| 700 | G4Exception(excep); |
---|
| 701 | } |
---|
| 702 | |
---|
| 703 | // Read parameters from tables and take logarithms |
---|
| 704 | G4float aRead; |
---|
| 705 | for(G4int i=0 ; i<106 ;i++){ |
---|
| 706 | fscanf(infile,"%f\t",&aRead); |
---|
| 707 | if(aRead > 0.0) aRead = std::log(aRead); |
---|
| 708 | else aRead = 0.0; |
---|
| 709 | ener[i]=aRead; |
---|
| 710 | } |
---|
| 711 | for(G4int j=0;j<103;j++){ |
---|
| 712 | for(G4int i=0;i<106;i++){ |
---|
| 713 | fscanf(infile,"%f\t",&aRead); |
---|
| 714 | if(aRead > 0.0) aRead = std::log(aRead); |
---|
| 715 | else aRead = 0.0; |
---|
| 716 | TCSE[j][i]=aRead; |
---|
| 717 | } |
---|
| 718 | } |
---|
| 719 | for(G4int j=0;j<103;j++){ |
---|
| 720 | for(G4int i=0;i<106;i++){ |
---|
| 721 | fscanf(infile,"%f\t",&aRead); |
---|
| 722 | if(aRead > 0.0) aRead = std::log(aRead); |
---|
| 723 | else aRead = 0.0; |
---|
| 724 | FTCSE[j][i]=aRead; |
---|
| 725 | } |
---|
| 726 | } |
---|
| 727 | for(G4int j=0;j<103;j++){ |
---|
| 728 | for(G4int i=0;i<106;i++){ |
---|
| 729 | fscanf(infile,"%f\t",&aRead); |
---|
| 730 | if(aRead > 0.0) aRead = std::log(aRead); |
---|
| 731 | else aRead = 0.0; |
---|
| 732 | TCSP[j][i]=aRead; |
---|
| 733 | } |
---|
| 734 | } |
---|
| 735 | for(G4int j=0;j<103;j++){ |
---|
| 736 | for(G4int i=0;i<106;i++){ |
---|
| 737 | fscanf(infile,"%f\t",&aRead); |
---|
| 738 | if(aRead > 0.0) aRead = std::log(aRead); |
---|
| 739 | else aRead = 0.0; |
---|
| 740 | FTCSP[j][i]=aRead; |
---|
| 741 | } |
---|
| 742 | } |
---|
| 743 | |
---|
| 744 | fclose(infile); |
---|
| 745 | //End loading XSections and Energies |
---|
| 746 | |
---|
| 747 | } |
---|
| 748 | |
---|
| 749 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
---|