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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 // << 26 // $Id: G4ionEffectiveCharge.cc,v 1.24.2.1 2010/01/26 14:33:54 gcosmo Exp $ 27 // ------------------------------------------- << 27 // GEANT4 tag $Name: geant4-09-02-patch-04 $ 28 // << 28 // 29 // GEANT4 Class file << 29 // ------------------------------------------------------------------- 30 // << 30 // 31 // << 31 // GEANT4 Class file 32 // File name: G4ionEffectiveCharge << 32 // 33 // << 33 // 34 // Author: Vladimir Ivanchenko << 34 // File name: G4ionEffectiveCharge 35 // << 35 // 36 // Creation date: 07.05.2002 << 36 // Author: Vladimir Ivanchenko 37 // << 37 // 38 // Modifications: << 38 // Creation date: 07.05.2002 39 // 12.09.2004 Set low energy limit to 1 keV (V << 39 // 40 // 25.01.2005 Add protection - min Charge 0.1 << 40 // Modifications: 41 // 28.04.2006 Set upper energy limit to 50 MeV << 41 // 12.09.2004 Set low energy limit to 1 keV (V.Ivanchenko) 42 // 23.05.2006 Set upper energy limit to Z*10 M << 42 // 25.01.2005 Add protection - min Charge 0.1 eplus (V.Ivanchenko) 43 // 15.08.2006 Add protection for not defined m << 43 // 28.04.2006 Set upper energy limit to 50 MeV (V.Ivanchenko) 44 // 27-09-2007 Use Fermi energy from material, << 44 // 23.05.2006 Set upper energy limit to Z*10 MeV (V.Ivanchenko) 45 // << 45 // 15.08.2006 Add protection for not defined material (V.Ivanchenko) 46 << 46 // 27-09-2007 Use Fermi energy from material, optimazed formulas (V.Ivanchenko) 47 // ------------------------------------------- << 47 // 48 // << 48 49 //....oooOO0OOooo........oooOO0OOooo........oo << 49 // ------------------------------------------------------------------- 50 //....oooOO0OOooo........oooOO0OOooo........oo << 50 // 51 << 51 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... 52 #include "G4ionEffectiveCharge.hh" << 52 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... 53 #include "G4PhysicalConstants.hh" << 53 54 #include "G4SystemOfUnits.hh" << 54 #include "G4ionEffectiveCharge.hh" 55 #include "G4UnitsTable.hh" << 55 #include "G4UnitsTable.hh" 56 #include "G4Material.hh" << 56 #include "G4Material.hh" 57 #include "G4NistManager.hh" << 57 #include "G4NistManager.hh" 58 #include "G4Log.hh" << 58 59 #include "G4Exp.hh" << 59 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... 60 #include "G4Pow.hh" << 60 61 << 61 G4ionEffectiveCharge::G4ionEffectiveCharge() 62 //....oooOO0OOooo........oooOO0OOooo........oo << 62 { 63 << 63 chargeCorrection = 1.0; 64 G4ionEffectiveCharge::G4ionEffectiveCharge() << 64 energyHighLimit = 20.0*MeV; 65 { << 65 energyLowLimit = 1.0*keV; 66 chargeCorrection = 1.0; << 66 energyBohr = 25.*keV; 67 energyHighLimit = 20.0*CLHEP::MeV; << 67 massFactor = amu_c2/(proton_mass_c2*keV); 68 energyLowLimit = 1.0*CLHEP::keV; << 68 minCharge = 1.0; 69 energyBohr = 25.*CLHEP::keV; << 69 lastPart = 0; 70 massFactor = CLHEP::amu_c2/(CLHEP::pro << 70 lastMat = 0; 71 minCharge = 1.0; << 71 lastKinEnergy = 0.0; 72 lastKinEnergy = 0.0; << 72 effCharge = eplus; 73 effCharge = CLHEP::eplus; << 73 nist = G4NistManager::Instance(); 74 inveplus = 1.0/CLHEP::eplus; << 74 } 75 g4calc = G4Pow::GetInstance(); << 75 76 } << 76 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... 77 << 77 78 //....oooOO0OOooo........oooOO0OOooo........oo << 78 G4ionEffectiveCharge::~G4ionEffectiveCharge() 79 << 79 {} 80 G4double G4ionEffectiveCharge::EffectiveCharge << 80 81 << 81 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... 82 << 82 83 { << 83 G4double G4ionEffectiveCharge::EffectiveCharge(const G4ParticleDefinition* p, 84 if(p == lastPart && material == lastMat && k << 84 const G4Material* material, 85 return effCharge; << 85 G4double kineticEnergy) 86 << 86 { 87 lastPart = p; << 87 if(p == lastPart && material == lastMat && kineticEnergy == lastKinEnergy) 88 lastMat = material; << 88 return effCharge; 89 lastKinEnergy = kineticEnergy; << 89 90 << 90 lastPart = p; 91 G4double mass = p->GetPDGMass(); << 91 lastMat = material; 92 effCharge = p->GetPDGCharge(); << 92 lastKinEnergy = kineticEnergy; 93 G4int Zi = G4lrint(effCharge*inveplus); << 93 94 chargeCorrection = 1.0; << 94 G4double mass = p->GetPDGMass(); 95 if(Zi <= 1) { return effCharge; } << 95 G4double charge = p->GetPDGCharge(); 96 << 96 G4double Zi = charge/eplus; 97 // The aproximation of ion effective charge << 97 98 // J.F.Ziegler, J.P. Biersack, U. Littmark << 98 chargeCorrection = 1.0; 99 // The Stopping and Range of Ions in Matter, << 99 effCharge = charge; 100 // Vol.1, Pergamon Press, 1985 << 100 101 // Fast ions or hadrons << 101 // The aproximation of ion effective charge from: 102 G4double reducedEnergy = kineticEnergy * CLH << 102 // J.F.Ziegler, J.P. Biersack, U. Littmark 103 << 103 // The Stopping and Range of Ions in Matter, 104 //G4cout << "e= " << reducedEnergy << " Zi= << 104 // Vol.1, Pergamon Press, 1985 105 //<< material->GetName() << G4endl; << 105 // Fast ions or hadrons 106 << 106 G4double reducedEnergy = kineticEnergy * proton_mass_c2/mass ; 107 if(reducedEnergy > effCharge*energyHighLimit << 107 108 return effCharge; << 108 //G4cout << "e= " << reducedEnergy << " Zi= " << Zi << " " << material->GetName() << G4endl; 109 } << 109 110 G4double z = material->GetIonisation()->GetZ << 110 if( reducedEnergy > Zi*energyHighLimit || Zi < 1.5 || !material) return charge; 111 reducedEnergy = std::max(reducedEnergy,energ << 111 112 << 112 G4double z = material->GetIonisation()->GetZeffective(); 113 // Helium ion case << 113 reducedEnergy = std::max(reducedEnergy,energyLowLimit); 114 if( Zi <= 2 ) { << 114 115 << 115 // Helium ion case 116 static const G4double c[6] = << 116 if( Zi < 2.5 ) { 117 {0.2865,0.1266,-0.001429,0.02402,-0.0113 << 117 118 << 118 static G4double c[6] = {0.2865, 0.1266, -0.001429, 119 G4double Q = std::max(0.0,G4Log(reducedEne << 119 0.02402,-0.01135, 0.001475} ; 120 G4double x = c[0]; << 120 121 G4double y = 1.0; << 121 G4double Q = std::max(0.0,std::log(reducedEnergy*massFactor)); 122 for (G4int i=1; i<6; ++i) { << 122 G4double x = c[0]; 123 y *= Q; << 123 G4double y = 1.0; 124 x += y * c[i] ; << 124 for (G4int i=1; i<6; i++) { 125 } << 125 y *= Q; 126 G4double ex = (x < 0.2) ? x * (1 - 0.5*x) << 126 x += y * c[i] ; 127 << 127 } 128 G4double tq = 7.6 - Q; << 128 G4double ex; 129 G4double tq2= tq*tq; << 129 if(x < 0.2) ex = x * (1 - 0.5*x); 130 G4double tt = ( 0.007 + 0.00005 * z ); << 130 else ex = 1. - std::exp(-x); 131 if(tq2 < 0.2) { tt *= (1.0 - tq2 + 0.5*tq2 << 131 132 else { tt *= G4Exp(-tq2); } << 132 G4double tq = 7.6 - Q; 133 << 133 G4double tq2= tq*tq; 134 effCharge *= (1.0 + tt) * std::sqrt(ex); << 134 G4double tt = ( 0.007 + 0.00005 * z ); 135 << 135 if(tq2 < 0.2) tt *= (1.0 - tq2 + 0.5*tq2*tq2); 136 // Heavy ion case << 136 else tt *= std::exp(-tq2); 137 } else { << 137 138 << 138 effCharge = charge*(1.0 + tt) * std::sqrt(ex); 139 G4double zi13 = g4calc->Z13(Zi); << 139 140 G4double zi23 = zi13*zi13; << 140 // Heavy ion case 141 << 141 } else { 142 // v1 is ion velocity in vF unit << 142 143 G4double eF = material->GetIonisation()- << 143 G4double y; 144 G4double v1sq = reducedEnergy/eF; << 144 // = nist->GetZ13(z); 145 G4double vFsq = eF/energyBohr; << 145 //G4double z23 = y*y; 146 G4double vF = std::sqrt(vFsq); << 146 G4double zi13 = nist->GetZ13(Zi); 147 << 147 G4double zi23 = zi13*zi13; 148 G4double y = ( v1sq > 1.0 ) << 148 // G4double e = std::max(reducedEnergy,energyBohr/z23); 149 // Faster than Fermi velocity << 149 //G4double e = reducedEnergy; 150 ? vF * std::sqrt(v1sq) * ( 1.0 + 0.2/v1s << 150 151 // Slower than Fermi velocity << 151 // v1 is ion velocity in vF unit 152 : 0.692308 * vF * (1.0 + 0.666666*v1sq + << 152 G4double eF = material->GetIonisation()->GetFermiEnergy(); 153 << 153 G4double v1sq = reducedEnergy/eF; 154 G4double y3 = G4Exp(0.3*G4Log(y)); << 154 G4double vFsq = eF/energyBohr; 155 // G4cout<<"y= "<<y<<" y3= "<<y3<<" v1= "< << 155 G4double vF = std::sqrt(eF/energyBohr); 156 G4double q = std::max(1.0 - G4Exp( 0.803*y << 156 157 - 0.00898 << 157 // Faster than Fermi velocity 158 << 158 if ( v1sq > 1.0 ) { 159 // compute charge correction << 159 y = vF * std::sqrt(v1sq) * ( 1.0 + 0.2/v1sq ) / zi23 ; 160 G4double tq = 7.6 - G4Log(reducedEnergy/CL << 160 161 G4double tq2= tq*tq; << 161 // Slower than Fermi velocity 162 G4double sq = 1.0 + ( 0.18 + 0.0015 * z )* << 162 } else { 163 // G4cout << "sq= " << sq << G4endl; << 163 y = 0.692308 * vF * (1.0 + 0.666666*v1sq + v1sq*v1sq/15.0) / zi23 ; 164 << 164 } 165 // Screen length according to << 165 166 // J.F.Ziegler and J.M.Manoyan, The stoppi << 166 G4double q; 167 // Nucl. Inst. & Meth. in Phys. Res. B35 ( << 167 G4double y3 = std::pow(y, 0.3) ; 168 << 168 // G4cout<<"y= "<<y<<" y3= "<<y3<<" v1= "<<v1<<" vF= "<<vF<<G4endl; 169 G4double lambda = 10.0 * vF *g4calc->A23(1 << 169 q = 1.0 - std::exp( 0.803*y3 - 1.3167*y3*y3 - 0.38157*y - 0.008983*y*y ) ; 170 G4double lambda2 = lambda*lambda; << 170 171 G4double xx = (0.5/q - 0.5)*G4Log(1.0 + la << 171 //y *= 0.77; 172 << 172 //y *= (0.75 + 0.52/Zi); 173 effCharge *= q; << 173 174 chargeCorrection = sq * (1.0 + xx); << 174 //if( y < 0.2 ) q = y*(1.0 - 0.5*y); 175 } << 175 //else q = 1.0 - std::exp(-y); 176 // G4cout << "G4ionEffectiveCharge: charge= << 176 177 // << " chargeCor= " << chargeCorrec << 177 G4double qmin = minCharge/Zi; 178 // << " e(MeV)= " << kineticEnergy << 178 if(q < qmin) q = qmin; 179 return effCharge; << 179 180 } << 180 effCharge = q*charge; 181 << 181 182 //....oooOO0OOooo........oooOO0OOooo........oo << 182 /* >> 183 G4double x1 = 1.0*effCharge*(1.0 - 0.132*std::log(y))/(y*std::sqrt(z)); >> 184 G4double x2 = 0.1*effCharge*effCharge*energyBohr/reducedEnergy; >> 185 >> 186 chargeCorrection = 1.0 + x1 - x2; >> 187 >> 188 G4cout << "x1= "<<x1<<" x2= "<< x2<<" corr= "<<chargeCorrection<<G4endl; >> 189 */ >> 190 >> 191 G4double tq = 7.6 - std::log(reducedEnergy/keV); >> 192 G4double tq2= tq*tq; >> 193 G4double sq = ( 0.18 + 0.0015 * z ) / (Zi*Zi); >> 194 if(tq2 < 0.2) sq *= (1.0 - tq2 + 0.5*tq2*tq2); >> 195 else sq *= std::exp(-tq2); >> 196 sq += 1.0; >> 197 // G4cout << "sq= " << sq << G4endl; >> 198 >> 199 // Screen length according to >> 200 // J.F.Ziegler and J.M.Manoyan, The stopping of ions in compaunds, >> 201 // Nucl. Inst. & Meth. in Phys. Res. B35 (1988) 215-228. >> 202 >> 203 G4double lambda = 10.0 * vF / (zi13 * (6.0 + q)); >> 204 if(q < 0.2) lambda *= (1.0 - 0.66666667*q - q*q/9.0); >> 205 else lambda *= std::pow(1.0-q, 0.666666); >> 206 >> 207 G4double lambda2 = lambda*lambda; >> 208 >> 209 G4double xx = (0.5/q - 0.5)/vFsq; >> 210 if(lambda2 < 0.2) xx *= lambda2*(1.0 - 0.5*lambda2); >> 211 else xx *= std::log(1.0 + lambda2); >> 212 >> 213 chargeCorrection = sq * (1.0 + xx); >> 214 >> 215 } >> 216 // G4cout << "G4ionEffectiveCharge: charge= " << charge << " q= " << q >> 217 // << " chargeCor= " << chargeCorrection >> 218 // << " e(MeV)= " << kineticEnergy/MeV << G4endl; >> 219 return effCharge; >> 220 } >> 221 >> 222 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... >> 223 >> 224 183 225