Geant4 Cross Reference |
1 // 1 // 2 // ******************************************* 2 // ******************************************************************** 3 // * License and Disclaimer << 3 // * DISCLAIMER * 4 // * 4 // * * 5 // * The Geant4 software is copyright of th << 5 // * The following disclaimer summarizes all the specific disclaimers * 6 // * the Geant4 Collaboration. It is provided << 6 // * of contributors to this software. The specific disclaimers,which * 7 // * conditions of the Geant4 Software License << 7 // * govern, are listed with their locations in: * 8 // * LICENSE and available at http://cern.ch/ << 8 // * http://cern.ch/geant4/license * 9 // * include a list of copyright holders. << 10 // * 9 // * * 11 // * Neither the authors of this software syst 10 // * Neither the authors of this software system, nor their employing * 12 // * institutes,nor the agencies providing fin 11 // * institutes,nor the agencies providing financial support for this * 13 // * work make any representation or warran 12 // * work make any representation or warranty, express or implied, * 14 // * regarding this software system or assum 13 // * regarding this software system or assume any liability for its * 15 // * use. Please see the license in the file << 14 // * use. * 16 // * for the full disclaimer and the limitatio << 17 // * 15 // * * 18 // * This code implementation is the result << 16 // * This code implementation is the intellectual property of the * 19 // * technical work of the GEANT4 collaboratio << 17 // * GEANT4 collaboration. * 20 // * By using, copying, modifying or distri << 18 // * By copying, distributing or modifying the Program (or any work * 21 // * any work based on the software) you ag << 19 // * based on the Program) you indicate your acceptance of this * 22 // * use in resulting scientific publicati << 20 // * statement, and all its terms. * 23 // * acceptance of all terms of the Geant4 Sof << 24 // ******************************************* 21 // ******************************************************************** 25 // 22 // >> 23 // $Id: G4ionEffectiveCharge.cc,v 1.8 2005/01/25 19:20:35 vnivanch Exp $ >> 24 // GEANT4 tag $Name: geant4-07-00-patch-01 $ 26 // 25 // 27 // ------------------------------------------- 26 // ------------------------------------------------------------------- 28 // 27 // 29 // GEANT4 Class file 28 // GEANT4 Class file 30 // 29 // 31 // 30 // 32 // File name: G4ionEffectiveCharge 31 // File name: G4ionEffectiveCharge 33 // 32 // 34 // Author: Vladimir Ivanchenko 33 // Author: Vladimir Ivanchenko 35 // 34 // 36 // Creation date: 07.05.2002 35 // Creation date: 07.05.2002 37 // 36 // 38 // Modifications: 37 // Modifications: 39 // 12.09.2004 Set low energy limit to 1 keV (V 38 // 12.09.2004 Set low energy limit to 1 keV (V.Ivanchenko) 40 // 25.01.2005 Add protection - min Charge 0.1 39 // 25.01.2005 Add protection - min Charge 0.1 eplus (V.Ivanchenko) 41 // 28.04.2006 Set upper energy limit to 50 MeV << 42 // 23.05.2006 Set upper energy limit to Z*10 M << 43 // 15.08.2006 Add protection for not defined m << 44 // 27-09-2007 Use Fermi energy from material, << 45 // 40 // 46 41 47 // ------------------------------------------- 42 // ------------------------------------------------------------------- 48 // 43 // 49 //....oooOO0OOooo........oooOO0OOooo........oo 44 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... 50 //....oooOO0OOooo........oooOO0OOooo........oo 45 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... 51 46 52 #include "G4ionEffectiveCharge.hh" 47 #include "G4ionEffectiveCharge.hh" 53 #include "G4PhysicalConstants.hh" << 54 #include "G4SystemOfUnits.hh" << 55 #include "G4UnitsTable.hh" 48 #include "G4UnitsTable.hh" >> 49 #include "G4ParticleDefinition.hh" 56 #include "G4Material.hh" 50 #include "G4Material.hh" 57 #include "G4NistManager.hh" << 58 #include "G4Log.hh" << 59 #include "G4Exp.hh" << 60 #include "G4Pow.hh" << 61 51 62 //....oooOO0OOooo........oooOO0OOooo........oo 52 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... 63 53 64 G4ionEffectiveCharge::G4ionEffectiveCharge() 54 G4ionEffectiveCharge::G4ionEffectiveCharge() 65 { 55 { 66 chargeCorrection = 1.0; 56 chargeCorrection = 1.0; 67 energyHighLimit = 20.0*CLHEP::MeV; << 57 energyHighLimit = 25.*MeV; 68 energyLowLimit = 1.0*CLHEP::keV; << 58 energyLowLimit = 1.0*keV; 69 energyBohr = 25.*CLHEP::keV; << 59 energyBohr = 25.*keV; 70 massFactor = CLHEP::amu_c2/(CLHEP::pro << 60 massFactor = amu_c2/(proton_mass_c2*keV); 71 minCharge = 1.0; << 61 minCharge = 0.1; 72 lastKinEnergy = 0.0; << 73 effCharge = CLHEP::eplus; << 74 inveplus = 1.0/CLHEP::eplus; << 75 g4calc = G4Pow::GetInstance(); << 76 } 62 } 77 63 78 //....oooOO0OOooo........oooOO0OOooo........oo 64 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... 79 65 >> 66 G4ionEffectiveCharge::~G4ionEffectiveCharge() >> 67 {} >> 68 >> 69 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... >> 70 80 G4double G4ionEffectiveCharge::EffectiveCharge 71 G4double G4ionEffectiveCharge::EffectiveCharge(const G4ParticleDefinition* p, 81 72 const G4Material* material, 82 << 73 G4double kineticEnergy) 83 { 74 { 84 if(p == lastPart && material == lastMat && k << 75 G4double mass = p->GetPDGMass(); 85 return effCharge; << 76 G4double charge = p->GetPDGCharge(); >> 77 G4double Zi = charge/eplus; 86 78 87 lastPart = p; << 88 lastMat = material; << 89 lastKinEnergy = kineticEnergy; << 90 << 91 G4double mass = p->GetPDGMass(); << 92 effCharge = p->GetPDGCharge(); << 93 G4int Zi = G4lrint(effCharge*inveplus); << 94 chargeCorrection = 1.0; 79 chargeCorrection = 1.0; 95 if(Zi <= 1) { return effCharge; } << 96 80 97 // The aproximation of ion effective charge 81 // The aproximation of ion effective charge from: 98 // J.F.Ziegler, J.P. Biersack, U. Littmark 82 // J.F.Ziegler, J.P. Biersack, U. Littmark 99 // The Stopping and Range of Ions in Matter, 83 // The Stopping and Range of Ions in Matter, 100 // Vol.1, Pergamon Press, 1985 84 // Vol.1, Pergamon Press, 1985 101 // Fast ions or hadrons 85 // Fast ions or hadrons 102 G4double reducedEnergy = kineticEnergy * CLH << 86 G4double reducedEnergy = kineticEnergy * proton_mass_c2/mass ; >> 87 if( reducedEnergy > energyHighLimit || Zi < 1.5 ) return charge; 103 88 104 //G4cout << "e= " << reducedEnergy << " Zi= << 89 static G4double vFermi[92] = { 105 //<< material->GetName() << G4endl; << 90 1.0309, 0.15976, 0.59782, 1.0781, 1.0486, 1.0, 1.058, 0.93942, 0.74562, 0.3424, >> 91 0.45259, 0.71074, 0.90519, 0.97411, 0.97184, 0.89852, 0.70827, 0.39816, 0.36552, 0.62712, >> 92 0.81707, 0.9943, 1.1423, 1.2381, 1.1222, 0.92705, 1.0047, 1.2, 1.0661, 0.97411, >> 93 0.84912, 0.95, 1.0903, 1.0429, 0.49715, 0.37755, 0.35211, 0.57801, 0.77773, 1.0207, >> 94 1.029, 1.2542, 1.122, 1.1241, 1.0882, 1.2709, 1.2542, 0.90094, 0.74093, 0.86054, >> 95 0.93155, 1.0047, 0.55379, 0.43289, 0.32636, 0.5131, 0.695, 0.72591, 0.71202, 0.67413, >> 96 0.71418, 0.71453, 0.5911, 0.70263, 0.68049, 0.68203, 0.68121, 0.68532, 0.68715, 0.61884, >> 97 0.71801, 0.83048, 1.1222, 1.2381, 1.045, 1.0733, 1.0953, 1.2381, 1.2879, 0.78654, >> 98 0.66401, 0.84912, 0.88433, 0.80746, 0.43357, 0.41923, 0.43638, 0.51464, 0.73087, 0.81065, >> 99 1.9578, 1.0257} ; >> 100 >> 101 static G4double lFactor[92] = { >> 102 1.0, 1.0, 1.1, 1.06, 1.01, 1.03, 1.04, 0.99, 0.95, 0.9, >> 103 0.82, 0.81, 0.83, 0.88, 1.0, 0.95, 0.97, 0.99, 0.98, 0.97, >> 104 0.98, 0.97, 0.96, 0.93, 0.91, 0.9, 0.88, 0.9, 0.9, 0.9, >> 105 0.9, 0.85, 0.9, 0.9, 0.91, 0.92, 0.9, 0.9, 0.9, 0.9, >> 106 0.9, 0.88, 0.9, 0.88, 0.88, 0.9, 0.9, 0.88, 0.9, 0.9, >> 107 0.9, 0.9, 0.96, 1.2, 0.9, 0.88, 0.88, 0.85, 0.9, 0.9, >> 108 0.92, 0.95, 0.99, 1.03, 1.05, 1.07, 1.08, 1.1, 1.08, 1.08, >> 109 1.08, 1.08, 1.09, 1.09, 1.1, 1.11, 1.12, 1.13, 1.14, 1.15, >> 110 1.17, 1.2, 1.18, 1.17, 1.17, 1.16, 1.16, 1.16, 1.16, 1.16, >> 111 1.16, 1.16} ; >> 112 >> 113 static G4double c[6] = {0.2865, 0.1266, -0.001429, >> 114 0.02402,-0.01135, 0.001475} ; >> 115 >> 116 // get elements in the actual material, >> 117 const G4ElementVector* theElementVector = material->GetElementVector() ; >> 118 const G4double* theAtomicNumDensityVector = >> 119 material->GetAtomicNumDensityVector() ; >> 120 const G4int NumberOfElements = material->GetNumberOfElements() ; >> 121 >> 122 // loop for the elements in the material >> 123 // to find out average values Z, vF, lF >> 124 G4double z = 0.0, vF = 0.0, lF = 0.0, norm = 0.0 ; >> 125 >> 126 if( 1 == NumberOfElements ) { >> 127 z = material->GetZ() ; >> 128 G4int iz = G4int(z) - 1 ; >> 129 if(iz < 0) iz = 0 ; >> 130 else if(iz > 91) iz = 91 ; >> 131 vF = vFermi[iz] ; >> 132 lF = lFactor[iz] ; >> 133 >> 134 } else { >> 135 for (G4int iel=0; iel<NumberOfElements; iel++) >> 136 { >> 137 const G4Element* element = (*theElementVector)[iel] ; >> 138 G4double z2 = element->GetZ() ; >> 139 const G4double weight = theAtomicNumDensityVector[iel] ; >> 140 norm += weight ; >> 141 z += z2 * weight ; >> 142 G4int iz = G4int(z2) - 1 ; >> 143 if(iz < 0) iz = 0 ; >> 144 else if(iz > 91) iz =91 ; >> 145 vF += vFermi[iz] * weight ; >> 146 lF += lFactor[iz] * weight ; >> 147 } >> 148 z /= norm ; >> 149 vF /= norm ; >> 150 lF /= norm ; >> 151 } 106 152 107 if(reducedEnergy > effCharge*energyHighLimit << 108 return effCharge; << 109 } << 110 G4double z = material->GetIonisation()->GetZ << 111 reducedEnergy = std::max(reducedEnergy,energ 153 reducedEnergy = std::max(reducedEnergy,energyLowLimit); >> 154 G4double q; 112 155 113 // Helium ion case 156 // Helium ion case 114 if( Zi <= 2 ) { << 157 if( Zi < 2.5 ) { 115 << 116 static const G4double c[6] = << 117 {0.2865,0.1266,-0.001429,0.02402,-0.0113 << 118 158 119 G4double Q = std::max(0.0,G4Log(reducedEne << 159 G4double Q = std::max(0.0,std::log(reducedEnergy*massFactor)); 120 G4double x = c[0]; 160 G4double x = c[0]; 121 G4double y = 1.0; 161 G4double y = 1.0; 122 for (G4int i=1; i<6; ++i) { << 162 for (G4int i=1; i<6; i++) { 123 y *= Q; 163 y *= Q; 124 x += y * c[i] ; 164 x += y * c[i] ; 125 } 165 } 126 G4double ex = (x < 0.2) ? x * (1 - 0.5*x) << 127 << 128 G4double tq = 7.6 - Q; 166 G4double tq = 7.6 - Q; 129 G4double tq2= tq*tq; << 167 q = (1.0 + ( 0.007 + 0.00005 * z ) * std::exp( -tq*tq )) * std::sqrt(1.0 - std::exp(-x)) ; 130 G4double tt = ( 0.007 + 0.00005 * z ); << 131 if(tq2 < 0.2) { tt *= (1.0 - tq2 + 0.5*tq2 << 132 else { tt *= G4Exp(-tq2); } << 133 << 134 effCharge *= (1.0 + tt) * std::sqrt(ex); << 135 168 136 // Heavy ion case 169 // Heavy ion case 137 } else { 170 } else { 138 << 139 G4double zi13 = g4calc->Z13(Zi); << 140 G4double zi23 = zi13*zi13; << 141 171 >> 172 G4double z23 = std::pow(z, 0.666667); >> 173 G4double zi13 = std::pow(Zi, 0.33333); >> 174 G4double zi23 = zi13*zi13; >> 175 reducedEnergy = std::max(reducedEnergy,energyBohr/z23); >> 176 142 // v1 is ion velocity in vF unit 177 // v1 is ion velocity in vF unit 143 G4double eF = material->GetIonisation()- << 178 G4double v1 = std::sqrt( reducedEnergy / energyBohr )/ vF ; 144 G4double v1sq = reducedEnergy/eF; << 179 G4double y ; 145 G4double vFsq = eF/energyBohr; << 180 146 G4double vF = std::sqrt(vFsq); << 181 // Faster than Fermi velocity 147 << 182 if ( v1 > 1.0 ) { 148 G4double y = ( v1sq > 1.0 ) << 183 y = vF * v1 * ( 1.0 + 0.2 / (v1*v1) ) / zi23 ; 149 // Faster than Fermi velocity << 184 150 ? vF * std::sqrt(v1sq) * ( 1.0 + 0.2/v1s << 151 // Slower than Fermi velocity 185 // Slower than Fermi velocity 152 : 0.692308 * vF * (1.0 + 0.666666*v1sq + << 186 } else { >> 187 y = 0.6923 * vF * (1.0 + 2.0*v1*v1/3.0 + v1*v1*v1*v1/15.0) / zi23 ; >> 188 } >> 189 >> 190 G4double y3 = std::pow(y, 0.3) ; >> 191 // G4cout << "y= " << y << " y3= " << y3 << " v1= " << v1 << " vF= " << vF << G4endl; >> 192 q = 1.0 - std::exp( 0.803*y3 - 1.3167*y3*y3 - 0.38157*y - 0.008983*y*y ) ; 153 193 154 G4double y3 = G4Exp(0.3*G4Log(y)); << 194 G4double qmin = minCharge/Zi; 155 // G4cout<<"y= "<<y<<" y3= "<<y3<<" v1= "< << 195 156 G4double q = std::max(1.0 - G4Exp( 0.803*y << 196 if(q < qmin) q = qmin; 157 - 0.00898 << 197 158 << 198 G4double tq = 7.6 - std::log(reducedEnergy/keV); 159 // compute charge correction << 199 G4double sq = 1.0 + ( 0.18 + 0.0015 * z ) * std::exp( -tq*tq )/ (Zi*Zi); 160 G4double tq = 7.6 - G4Log(reducedEnergy/CL << 161 G4double tq2= tq*tq; << 162 G4double sq = 1.0 + ( 0.18 + 0.0015 * z )* << 163 // G4cout << "sq= " << sq << G4endl; 200 // G4cout << "sq= " << sq << G4endl; 164 201 165 // Screen length according to 202 // Screen length according to 166 // J.F.Ziegler and J.M.Manoyan, The stoppi 203 // J.F.Ziegler and J.M.Manoyan, The stopping of ions in compaunds, 167 // Nucl. Inst. & Meth. in Phys. Res. B35 ( 204 // Nucl. Inst. & Meth. in Phys. Res. B35 (1988) 215-228. 168 205 169 G4double lambda = 10.0 * vF *g4calc->A23(1 << 206 G4double lambda = 10.0 * vF * std::pow(1.0-q, 0.6667) / (zi13 * (6.0 + q)) ; 170 G4double lambda2 = lambda*lambda; << 207 chargeCorrection = sq * (1.0 + (0.5/q - 0.5)*std::log(1.0 + lambda*lambda)/(vF*vF) ); 171 G4double xx = (0.5/q - 0.5)*G4Log(1.0 + la << 172 << 173 effCharge *= q; << 174 chargeCorrection = sq * (1.0 + xx); << 175 } 208 } 176 // G4cout << "G4ionEffectiveCharge: charge= 209 // G4cout << "G4ionEffectiveCharge: charge= " << charge << " q= " << q 177 // << " chargeCor= " << chargeCorrec 210 // << " chargeCor= " << chargeCorrection 178 // << " e(MeV)= " << kineticEnergy << 211 // << " e(MeV)= " << kineticEnergy/MeV << G4endl; 179 return effCharge; << 212 return q*charge; 180 } 213 } 181 214 182 //....oooOO0OOooo........oooOO0OOooo........oo 215 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... >> 216 >> 217 183 218