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Please see the license in the file LICENSE and URL above * 16 // * for the full disclaimer and the limitatio 16 // * for the full disclaimer and the limitation of liability. * 17 // * 17 // * * 18 // * This code implementation is the result 18 // * This code implementation is the result of the scientific and * 19 // * technical work of the GEANT4 collaboratio 19 // * technical work of the GEANT4 collaboration. * 20 // * By using, copying, modifying or distri 20 // * By using, copying, modifying or distributing the software (or * 21 // * any work based on the software) you ag 21 // * any work based on the software) you agree to acknowledge its * 22 // * use in resulting scientific publicati 22 // * use in resulting scientific publications, and indicate your * 23 // * acceptance of all terms of the Geant4 Sof 23 // * acceptance of all terms of the Geant4 Software license. * 24 // ******************************************* 24 // ******************************************************************** 25 // 25 // >> 26 // >> 27 // $Id$ >> 28 // >> 29 >> 30 #include <complex> 26 31 27 #include "G4RegularXTRadiator.hh" 32 #include "G4RegularXTRadiator.hh" >> 33 #include "G4PhysicalConstants.hh" >> 34 #include "Randomize.hh" 28 35 29 #include "G4Gamma.hh" 36 #include "G4Gamma.hh" 30 #include "G4PhysicalConstants.hh" << 31 37 32 ////////////////////////////////////////////// 38 //////////////////////////////////////////////////////////////////////////// >> 39 // 33 // Constructor, destructor 40 // Constructor, destructor 34 G4RegularXTRadiator::G4RegularXTRadiator(G4Log << 41 35 G4Mat << 42 G4RegularXTRadiator::G4RegularXTRadiator(G4LogicalVolume *anEnvelope, 36 G4Mat << 43 G4Material* foilMat,G4Material* gasMat, 37 G4dou << 44 G4double a, G4double b, G4int n, 38 const << 45 const G4String& processName) : 39 : G4VXTRenergyLoss(anEnvelope, foilMat, gasM << 46 G4VXTRenergyLoss(anEnvelope,foilMat,gasMat,a,b,n,processName) 40 { 47 { 41 G4cout << "Regular X-ray TR radiator EM proc << 48 G4cout<<"Regular X-ray TR radiator EM process is called"<<G4endl ; 42 49 43 // Build energy and angular integral spectra 50 // Build energy and angular integral spectra of X-ray TR photons from 44 // a radiator 51 // a radiator 45 52 46 fAlphaPlate = 10000; 53 fAlphaPlate = 10000; 47 fAlphaGas = 1000; 54 fAlphaGas = 1000; 48 G4cout << "fAlphaPlate = " << fAlphaPlate << << 55 G4cout<<"fAlphaPlate = "<<fAlphaPlate<<" ; fAlphaGas = "<<fAlphaGas<<G4endl ; 49 << G4endl; << 56 >> 57 // BuildTable() ; 50 } 58 } 51 59 52 ////////////////////////////////////////////// 60 /////////////////////////////////////////////////////////////////////////// 53 G4RegularXTRadiator::~G4RegularXTRadiator() = << 54 61 55 void G4RegularXTRadiator::ProcessDescription(s << 62 G4RegularXTRadiator::~G4RegularXTRadiator() 56 { 63 { 57 out << "Simulation of X-ray transition radia << 64 ; 58 "relativistic charged particles cross << 59 "two materials. Thicknesses of plates << 60 } 65 } 61 66 62 ////////////////////////////////////////////// 67 /////////////////////////////////////////////////////////////////////////// >> 68 // >> 69 // >> 70 63 G4double G4RegularXTRadiator::SpectralXTRdEdx( 71 G4double G4RegularXTRadiator::SpectralXTRdEdx(G4double energy) 64 { 72 { 65 G4double result, sum = 0., tmp, cof1, cof2, << 73 G4double result, sum = 0., tmp, cof1, cof2, cofMin, cofPHC, theta2, theta2k; 66 G4double aMa, bMb, sigma, dump; << 74 G4double aMa, bMb ,sigma, dump; 67 G4int k, kMax, kMin; 75 G4int k, kMax, kMin; 68 76 69 aMa = fPlateThick * GetPlateLinearPhotoAbs << 77 aMa = fPlateThick*GetPlateLinearPhotoAbs(energy); 70 bMb = fGasThick * GetGasLinearPhotoAbs(ene << 78 bMb = fGasThick*GetGasLinearPhotoAbs(energy); 71 sigma = 0.5 * (aMa + bMb); << 79 sigma = 0.5*(aMa + bMb); 72 dump = std::exp(-fPlateNumber * sigma); << 80 dump = std::exp(-fPlateNumber*sigma); 73 if(verboseLevel > 2) << 81 if(verboseLevel > 2) G4cout<<" dump = "<<dump<<G4endl; 74 G4cout << " dump = " << dump << G4endl; << 82 cofPHC = 4*pi*hbarc; 75 cofPHC = 4 * pi * hbarc; << 83 tmp = (fSigma1 - fSigma2)/cofPHC/energy; 76 tmp = (fSigma1 - fSigma2) / cofPHC / ener << 84 cof1 = fPlateThick*tmp; 77 cof1 = fPlateThick * tmp; << 85 cof2 = fGasThick*tmp; 78 cof2 = fGasThick * tmp; << 79 86 80 cofMin = energy * (fPlateThick + fGasThick) << 87 cofMin = energy*(fPlateThick + fGasThick)/fGamma/fGamma; 81 cofMin += (fPlateThick * fSigma1 + fGasThick << 88 cofMin += (fPlateThick*fSigma1 + fGasThick*fSigma2)/energy; 82 cofMin /= cofPHC; 89 cofMin /= cofPHC; 83 90 84 theta2 = cofPHC / (energy * (fPlateThick + f << 91 theta2 = cofPHC/(energy*(fPlateThick + fGasThick)); >> 92 >> 93 // if (fGamma < 1200) kMin = G4int(cofMin); // 1200 ? >> 94 // else kMin = 1; >> 95 85 96 86 kMin = G4int(cofMin); 97 kMin = G4int(cofMin); 87 if(cofMin > kMin) << 98 if (cofMin > kMin) kMin++; 88 kMin++; << 99 >> 100 // tmp = (fPlateThick + fGasThick)*energy*fMaxThetaTR; >> 101 // tmp /= cofPHC; >> 102 // kMax = G4int(tmp); >> 103 // if(kMax < 0) kMax = 0; >> 104 // kMax += kMin; >> 105 89 106 90 kMax = kMin + 49; << 107 kMax = kMin + 49; // 19; // kMin + G4int(tmp); >> 108 >> 109 // tmp /= fGamma; >> 110 // if( G4int(tmp) < kMin ) kMin = G4int(tmp); 91 111 92 if(verboseLevel > 2) 112 if(verboseLevel > 2) 93 { << 113 { 94 G4cout << cof1 << " " << cof2 << " << 114 G4cout<<cof1<<" "<<cof2<<" "<<cofMin<<G4endl; 95 G4cout << "kMin = " << kMin << "; kMax << 115 G4cout<<"kMin = "<<kMin<<"; kMax = "<<kMax<<G4endl; 96 } 116 } 97 for(k = kMin; k <= kMax; ++k) << 117 for( k = kMin; k <= kMax; k++ ) 98 { 118 { 99 tmp = pi * fPlateThick * (k + cof2) / ( << 119 tmp = pi*fPlateThick*(k + cof2)/(fPlateThick + fGasThick); 100 result = (k - cof1) * (k - cof1) * (k + co << 120 result = (k - cof1)*(k - cof1)*(k + cof2)*(k + cof2); 101 if(k == kMin && kMin == G4int(cofMin)) << 121 // tmp = std::sin(tmp)*std::sin(tmp)*std::abs(k-cofMin)/result; >> 122 if( k == kMin && kMin == G4int(cofMin) ) 102 { 123 { 103 sum += << 124 sum += 0.5*std::sin(tmp)*std::sin(tmp)*std::abs(k-cofMin)/result; 104 0.5 * std::sin(tmp) * std::sin(tmp) * << 105 } 125 } 106 else 126 else 107 { 127 { 108 sum += std::sin(tmp) * std::sin(tmp) * s << 128 sum += std::sin(tmp)*std::sin(tmp)*std::abs(k-cofMin)/result; 109 } 129 } 110 theta2k = std::sqrt(theta2 * std::abs(k - << 130 theta2k = std::sqrt(theta2*std::abs(k-cofMin)); 111 131 112 if(verboseLevel > 2) 132 if(verboseLevel > 2) 113 { << 133 { 114 G4cout << k << " " << theta2k << " << 134 // G4cout<<"k = "<<k<<"; sqrt(theta2k) = "<<theta2k<<"; tmp = "<<std::sin(tmp)*std::sin(tmp)*std::abs(k-cofMin)/result 115 << std::sin(tmp) * std::sin(tmp) << 135 // <<"; sum = "<<sum<<G4endl; 116 << " " << sum << G4endl; << 136 G4cout<<k<<" "<<theta2k<<" "<<std::sin(tmp)*std::sin(tmp)*std::abs(k-cofMin)/result 117 } << 137 <<" "<<sum<<G4endl; >> 138 } 118 } 139 } 119 result = 2 * (cof1 + cof2) * (cof1 + cof2) * << 140 result = 2*( cof1 + cof2 )*( cof1 + cof2 )*sum/energy; 120 result *= (1 - dump + 2 * dump * fPlateNumbe << 141 // result *= ( 1 - std::exp(-0.5*fPlateNumber*sigma) )/( 1 - std::exp(-0.5*sigma) ); 121 << 142 // fPlateNumber; >> 143 result *= ( 1 - dump + 2*dump*fPlateNumber ); >> 144 /* >> 145 fEnergy = energy; >> 146 // G4Integrator<G4VXTRenergyLoss,G4double(G4VXTRenergyLoss::*)(G4double)> integral; >> 147 G4Integrator<G4TransparentRegXTRadiator,G4double(G4VXTRenergyLoss::*)(G4double)> integral; >> 148 >> 149 tmp = integral.Legendre96(this,&G4VXTRenergyLoss::SpectralAngleXTRdEdx, >> 150 0.0,0.3*fMaxThetaTR) + >> 151 integral.Legendre96(this,&G4VXTRenergyLoss::SpectralAngleXTRdEdx, >> 152 0.3*fMaxThetaTR,0.6*fMaxThetaTR) + >> 153 integral.Legendre96(this,&G4VXTRenergyLoss::SpectralAngleXTRdEdx, >> 154 0.6*fMaxThetaTR,fMaxThetaTR) ; >> 155 result += tmp; >> 156 */ 122 return result; 157 return result; 123 } 158 } 124 159 >> 160 >> 161 125 ////////////////////////////////////////////// 162 /////////////////////////////////////////////////////////////////////////// >> 163 // 126 // Approximation for radiator interference fac 164 // Approximation for radiator interference factor for the case of 127 // fully Regular radiator. The plate and gas g << 165 // fully Regular radiator. The plate and gas gap thicknesses are fixed . 128 // The mean values of the plate and gas gap th << 166 // The mean values of the plate and gas gap thicknesses 129 // are supposed to be about XTR formation zone << 167 // are supposed to be about XTR formation zones but much less than 130 // mean absorption length of XTR photons in co << 168 // mean absorption length of XTR photons in coresponding material. 131 << 169 132 G4double G4RegularXTRadiator::GetStackFactor(G << 170 G4double 133 G << 171 G4RegularXTRadiator::GetStackFactor( G4double energy, >> 172 G4double gamma, G4double varAngle ) 134 { 173 { >> 174 135 // some gamma (10000/1000) like algorithm 175 // some gamma (10000/1000) like algorithm 136 176 137 G4double result, Za, Zb, Ma, Mb; 177 G4double result, Za, Zb, Ma, Mb; 138 << 178 139 Za = GetPlateFormationZone(energy, gamma, va << 179 Za = GetPlateFormationZone(energy,gamma,varAngle); 140 Zb = GetGasFormationZone(energy, gamma, varA << 180 Zb = GetGasFormationZone(energy,gamma,varAngle); 141 181 142 Ma = GetPlateLinearPhotoAbs(energy); 182 Ma = GetPlateLinearPhotoAbs(energy); 143 Mb = GetGasLinearPhotoAbs(energy); 183 Mb = GetGasLinearPhotoAbs(energy); 144 184 145 G4complex Ca(1.0 + 0.5 * fPlateThick * Ma / << 146 fPlateThick / Za / fAlphaPlate) << 147 G4complex Cb(1.0 + 0.5 * fGasThick * Mb / fA << 148 fGasThick / Zb / fAlphaGas); << 149 185 150 G4complex Ha = std::pow(Ca, -fAlphaPlate); << 186 G4complex Ca(1.0+0.5*fPlateThick*Ma/fAlphaPlate,fPlateThick/Za/fAlphaPlate); 151 G4complex Hb = std::pow(Cb, -fAlphaGas); << 187 G4complex Cb(1.0+0.5*fGasThick*Mb/fAlphaGas,fGasThick/Zb/fAlphaGas); 152 G4complex H = Ha * Hb; << 188 >> 189 G4complex Ha = std::pow(Ca,-fAlphaPlate); >> 190 G4complex Hb = std::pow(Cb,-fAlphaGas); >> 191 G4complex H = Ha*Hb; >> 192 >> 193 G4complex F1 = (1.0 - Ha)*(1.0 - Hb )/(1.0 - H) >> 194 * G4double(fPlateNumber); >> 195 >> 196 G4complex F2 = (1.0-Ha)*(1.0-Ha)*Hb/(1.0-H)/(1.0-H) >> 197 * (1.0 - std::pow(H,fPlateNumber)); >> 198 >> 199 G4complex R = (F1 + F2)*OneInterfaceXTRdEdx(energy,gamma,varAngle); >> 200 >> 201 result = 2.0*std::real(R); >> 202 >> 203 return result; >> 204 >> 205 /* >> 206 // numerically stable but slow algorithm >> 207 >> 208 G4double result, Qa, Qb, Q, aZa, bZb, aMa, bMb; // , D; >> 209 >> 210 aZa = fPlateThick/GetPlateFormationZone(energy,gamma,varAngle); >> 211 bZb = fGasThick/GetGasFormationZone(energy,gamma,varAngle); >> 212 aMa = fPlateThick*GetPlateLinearPhotoAbs(energy); >> 213 bMb = fGasThick*GetGasLinearPhotoAbs(energy); >> 214 Qa = std::exp(-aMa); >> 215 Qb = std::exp(-bMb); >> 216 Q = Qa*Qb; >> 217 G4complex Ha( std::exp(-0.5*aMa)*std::cos(aZa), >> 218 -std::exp(-0.5*aMa)*std::sin(aZa) ); >> 219 G4complex Hb( std::exp(-0.5*bMb)*std::cos(bZb), >> 220 -std::exp(-0.5*bMb)*std::sin(bZb) ); >> 221 G4complex H = Ha*Hb; >> 222 >> 223 G4complex Hs = conj(H); >> 224 D = 1.0 /( (1 - std::sqrt(Q))*(1 - std::sqrt(Q)) + >> 225 4*std::sqrt(Q)*std::sin(0.5*(aZa+bZb))*std::sin(0.5*(aZa+bZb)) ); >> 226 G4complex F1 = (1.0 - Ha)*(1.0 - Hb)*(1.0 - Hs) >> 227 * G4double(fPlateNumber)*D; >> 228 G4complex F2 = (1.0-Ha)*(1.0-Ha)*Hb*(1.0-Hs)*(1.0-Hs) >> 229 * (1.0 - std::pow(H,fPlateNumber)) * D*D; >> 230 G4complex R = (F1 + F2)*OneInterfaceXTRdEdx(energy,gamma,varAngle); >> 231 >> 232 >> 233 G4complex S(0.,0.), c(1.,0.); >> 234 G4int k; >> 235 for(k = 1; k < fPlateNumber; k++) >> 236 { >> 237 c *= H; >> 238 S += ( G4double(fPlateNumber) - G4double(k) )*c; >> 239 } >> 240 G4complex R = (2.- Ha - 1./Ha)*S + (1. - Ha)*G4double(fPlateNumber); >> 241 R *= OneInterfaceXTRdEdx(energy,gamma,varAngle); >> 242 result = 2.0*std::real(R); >> 243 return result; >> 244 */ >> 245 } >> 246 >> 247 >> 248 // >> 249 // >> 250 //////////////////////////////////////////////////////////////////////////// >> 251 >> 252 >> 253 153 254 154 G4complex F1 = (1.0 - Ha) * (1.0 - Hb) / (1. << 155 255 156 G4complex F2 = (1.0 - Ha) * (1.0 - Ha) * Hb << 157 (1.0 - std::pow(H, fPlateNumb << 158 256 159 G4complex R = (F1 + F2) * OneInterfaceXTRdEd << 160 257 161 result = 2.0 * std::real(R); << 162 258 163 return result; << 164 } << 165 259