| Geant4 Cross Reference |
1 // 1 //
2 // ******************************************* 2 // ********************************************************************
3 // * License and Disclaimer 3 // * License and Disclaimer *
4 // * 4 // * *
5 // * The Geant4 software is copyright of th 5 // * The Geant4 software is copyright of the Copyright Holders of *
6 // * the Geant4 Collaboration. It is provided 6 // * the Geant4 Collaboration. It is provided under the terms and *
7 // * conditions of the Geant4 Software License 7 // * conditions of the Geant4 Software License, included in the file *
8 // * LICENSE and available at http://cern.ch/ 8 // * LICENSE and available at http://cern.ch/geant4/license . These *
9 // * include a list of copyright holders. 9 // * include a list of copyright holders. *
10 // * 10 // * *
11 // * Neither the authors of this software syst 11 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing fin 12 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warran 13 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assum 14 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file 15 // * use. 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 // $Id$
26 // 27 //
27 // ------------------------------------------- 28 // -------------------------------------------------------------------
28 // 29 //
29 // GEANT4 Class file 30 // GEANT4 Class file
30 // 31 //
31 // 32 //
32 // File name: G4ionEffectiveCharge 33 // File name: G4ionEffectiveCharge
33 // 34 //
34 // Author: Vladimir Ivanchenko 35 // Author: Vladimir Ivanchenko
35 // 36 //
36 // Creation date: 07.05.2002 37 // Creation date: 07.05.2002
37 // 38 //
38 // Modifications: 39 // Modifications:
39 // 12.09.2004 Set low energy limit to 1 keV (V 40 // 12.09.2004 Set low energy limit to 1 keV (V.Ivanchenko)
40 // 25.01.2005 Add protection - min Charge 0.1 41 // 25.01.2005 Add protection - min Charge 0.1 eplus (V.Ivanchenko)
41 // 28.04.2006 Set upper energy limit to 50 MeV 42 // 28.04.2006 Set upper energy limit to 50 MeV (V.Ivanchenko)
42 // 23.05.2006 Set upper energy limit to Z*10 M 43 // 23.05.2006 Set upper energy limit to Z*10 MeV (V.Ivanchenko)
43 // 15.08.2006 Add protection for not defined m 44 // 15.08.2006 Add protection for not defined material (V.Ivanchenko)
44 // 27-09-2007 Use Fermi energy from material, 45 // 27-09-2007 Use Fermi energy from material, optimazed formulas (V.Ivanchenko)
45 // 46 //
46 47
47 // ------------------------------------------- 48 // -------------------------------------------------------------------
48 // 49 //
49 //....oooOO0OOooo........oooOO0OOooo........oo 50 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
50 //....oooOO0OOooo........oooOO0OOooo........oo 51 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
51 52
52 #include "G4ionEffectiveCharge.hh" 53 #include "G4ionEffectiveCharge.hh"
53 #include "G4PhysicalConstants.hh" 54 #include "G4PhysicalConstants.hh"
54 #include "G4SystemOfUnits.hh" 55 #include "G4SystemOfUnits.hh"
55 #include "G4UnitsTable.hh" 56 #include "G4UnitsTable.hh"
56 #include "G4Material.hh" 57 #include "G4Material.hh"
57 #include "G4NistManager.hh" 58 #include "G4NistManager.hh"
58 #include "G4Log.hh" <<
59 #include "G4Exp.hh" <<
60 #include "G4Pow.hh" <<
61 59
62 //....oooOO0OOooo........oooOO0OOooo........oo 60 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
63 61
64 G4ionEffectiveCharge::G4ionEffectiveCharge() 62 G4ionEffectiveCharge::G4ionEffectiveCharge()
65 { 63 {
66 chargeCorrection = 1.0; 64 chargeCorrection = 1.0;
67 energyHighLimit = 20.0*CLHEP::MeV; << 65 energyHighLimit = 20.0*MeV;
68 energyLowLimit = 1.0*CLHEP::keV; << 66 energyLowLimit = 1.0*keV;
69 energyBohr = 25.*CLHEP::keV; << 67 energyBohr = 25.*keV;
70 massFactor = CLHEP::amu_c2/(CLHEP::pro << 68 massFactor = amu_c2/(proton_mass_c2*keV);
71 minCharge = 1.0; 69 minCharge = 1.0;
>> 70 lastPart = 0;
>> 71 lastMat = 0;
72 lastKinEnergy = 0.0; 72 lastKinEnergy = 0.0;
73 effCharge = CLHEP::eplus; << 73 effCharge = eplus;
74 inveplus = 1.0/CLHEP::eplus; << 74 nist = G4NistManager::Instance();
75 g4calc = G4Pow::GetInstance(); <<
76 } 75 }
77 76
78 //....oooOO0OOooo........oooOO0OOooo........oo 77 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
79 78
>> 79 G4ionEffectiveCharge::~G4ionEffectiveCharge()
>> 80 {}
>> 81
>> 82 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 83
80 G4double G4ionEffectiveCharge::EffectiveCharge 84 G4double G4ionEffectiveCharge::EffectiveCharge(const G4ParticleDefinition* p,
81 85 const G4Material* material,
82 << 86 G4double kineticEnergy)
83 { 87 {
84 if(p == lastPart && material == lastMat && k 88 if(p == lastPart && material == lastMat && kineticEnergy == lastKinEnergy)
85 return effCharge; 89 return effCharge;
86 90
87 lastPart = p; 91 lastPart = p;
88 lastMat = material; 92 lastMat = material;
89 lastKinEnergy = kineticEnergy; 93 lastKinEnergy = kineticEnergy;
90 94
91 G4double mass = p->GetPDGMass(); << 95 G4double mass = p->GetPDGMass();
92 effCharge = p->GetPDGCharge(); << 96 G4double charge = p->GetPDGCharge();
93 G4int Zi = G4lrint(effCharge*inveplus); << 97 G4double Zi = charge/eplus;
>> 98
94 chargeCorrection = 1.0; 99 chargeCorrection = 1.0;
95 if(Zi <= 1) { return effCharge; } << 100 effCharge = charge;
96 101
97 // The aproximation of ion effective charge 102 // The aproximation of ion effective charge from:
98 // J.F.Ziegler, J.P. Biersack, U. Littmark 103 // J.F.Ziegler, J.P. Biersack, U. Littmark
99 // The Stopping and Range of Ions in Matter, 104 // The Stopping and Range of Ions in Matter,
100 // Vol.1, Pergamon Press, 1985 105 // Vol.1, Pergamon Press, 1985
101 // Fast ions or hadrons 106 // Fast ions or hadrons
102 G4double reducedEnergy = kineticEnergy * CLH << 107 G4double reducedEnergy = kineticEnergy * proton_mass_c2/mass ;
103 108
104 //G4cout << "e= " << reducedEnergy << " Zi= << 109 //G4cout << "e= " << reducedEnergy << " Zi= " << Zi << " " << material->GetName() << G4endl;
105 //<< material->GetName() << G4endl; <<
106 110
107 if(reducedEnergy > effCharge*energyHighLimit << 111 if( reducedEnergy > Zi*energyHighLimit || Zi < 1.5 || !material) return charge;
108 return effCharge; << 112
109 } << 113 G4double z = material->GetIonisation()->GetZeffective();
110 G4double z = material->GetIonisation()->GetZ <<
111 reducedEnergy = std::max(reducedEnergy,energ 114 reducedEnergy = std::max(reducedEnergy,energyLowLimit);
112 115
113 // Helium ion case 116 // Helium ion case
114 if( Zi <= 2 ) { << 117 if( Zi < 2.5 ) {
115 118
116 static const G4double c[6] = << 119 static G4double c[6] = {0.2865, 0.1266, -0.001429,
117 {0.2865,0.1266,-0.001429,0.02402,-0.0113 << 120 0.02402,-0.01135, 0.001475} ;
118 121
119 G4double Q = std::max(0.0,G4Log(reducedEne << 122 G4double Q = std::max(0.0,std::log(reducedEnergy*massFactor));
120 G4double x = c[0]; 123 G4double x = c[0];
121 G4double y = 1.0; 124 G4double y = 1.0;
122 for (G4int i=1; i<6; ++i) { << 125 for (G4int i=1; i<6; i++) {
123 y *= Q; 126 y *= Q;
124 x += y * c[i] ; 127 x += y * c[i] ;
125 } 128 }
126 G4double ex = (x < 0.2) ? x * (1 - 0.5*x) << 129 G4double ex;
>> 130 if(x < 0.2) ex = x * (1 - 0.5*x);
>> 131 else ex = 1. - std::exp(-x);
127 132
128 G4double tq = 7.6 - Q; 133 G4double tq = 7.6 - Q;
129 G4double tq2= tq*tq; 134 G4double tq2= tq*tq;
130 G4double tt = ( 0.007 + 0.00005 * z ); 135 G4double tt = ( 0.007 + 0.00005 * z );
131 if(tq2 < 0.2) { tt *= (1.0 - tq2 + 0.5*tq2 << 136 if(tq2 < 0.2) tt *= (1.0 - tq2 + 0.5*tq2*tq2);
132 else { tt *= G4Exp(-tq2); } << 137 else tt *= std::exp(-tq2);
133 138
134 effCharge *= (1.0 + tt) * std::sqrt(ex); << 139 effCharge = charge*(1.0 + tt) * std::sqrt(ex);
135 140
136 // Heavy ion case 141 // Heavy ion case
137 } else { 142 } else {
138 143
139 G4double zi13 = g4calc->Z13(Zi); << 144 G4double y;
>> 145 // = nist->GetZ13(z);
>> 146 //G4double z23 = y*y;
>> 147 G4double zi13 = nist->GetZ13(Zi);
140 G4double zi23 = zi13*zi13; 148 G4double zi23 = zi13*zi13;
>> 149 // G4double e = std::max(reducedEnergy,energyBohr/z23);
>> 150 //G4double e = reducedEnergy;
141 151
142 // v1 is ion velocity in vF unit 152 // v1 is ion velocity in vF unit
143 G4double eF = material->GetIonisation()- 153 G4double eF = material->GetIonisation()->GetFermiEnergy();
144 G4double v1sq = reducedEnergy/eF; 154 G4double v1sq = reducedEnergy/eF;
145 G4double vFsq = eF/energyBohr; 155 G4double vFsq = eF/energyBohr;
146 G4double vF = std::sqrt(vFsq); << 156 G4double vF = std::sqrt(eF/energyBohr);
>> 157
>> 158 // Faster than Fermi velocity
>> 159 if ( v1sq > 1.0 ) {
>> 160 y = vF * std::sqrt(v1sq) * ( 1.0 + 0.2/v1sq ) / zi23 ;
147 161
148 G4double y = ( v1sq > 1.0 ) <<
149 // Faster than Fermi velocity <<
150 ? vF * std::sqrt(v1sq) * ( 1.0 + 0.2/v1s <<
151 // Slower than Fermi velocity 162 // Slower than Fermi velocity
152 : 0.692308 * vF * (1.0 + 0.666666*v1sq + << 163 } else {
>> 164 y = 0.692308 * vF * (1.0 + 0.666666*v1sq + v1sq*v1sq/15.0) / zi23 ;
>> 165 }
153 166
154 G4double y3 = G4Exp(0.3*G4Log(y)); << 167 G4double q;
>> 168 G4double y3 = std::pow(y, 0.3) ;
155 // G4cout<<"y= "<<y<<" y3= "<<y3<<" v1= "< 169 // G4cout<<"y= "<<y<<" y3= "<<y3<<" v1= "<<v1<<" vF= "<<vF<<G4endl;
156 G4double q = std::max(1.0 - G4Exp( 0.803*y << 170 q = 1.0 - std::exp( 0.803*y3 - 1.3167*y3*y3 - 0.38157*y - 0.008983*y*y ) ;
157 - 0.00898 << 171
>> 172 //y *= 0.77;
>> 173 //y *= (0.75 + 0.52/Zi);
>> 174
>> 175 //if( y < 0.2 ) q = y*(1.0 - 0.5*y);
>> 176 //else q = 1.0 - std::exp(-y);
>> 177
>> 178 G4double qmin = minCharge/Zi;
>> 179 if(q < qmin) q = qmin;
>> 180
>> 181 effCharge = q*charge;
>> 182
>> 183 /*
>> 184 G4double x1 = 1.0*effCharge*(1.0 - 0.132*std::log(y))/(y*std::sqrt(z));
>> 185 G4double x2 = 0.1*effCharge*effCharge*energyBohr/reducedEnergy;
>> 186
>> 187 chargeCorrection = 1.0 + x1 - x2;
>> 188
>> 189 G4cout << "x1= "<<x1<<" x2= "<< x2<<" corr= "<<chargeCorrection<<G4endl;
>> 190 */
158 191
159 // compute charge correction << 192 G4double tq = 7.6 - std::log(reducedEnergy/keV);
160 G4double tq = 7.6 - G4Log(reducedEnergy/CL <<
161 G4double tq2= tq*tq; 193 G4double tq2= tq*tq;
162 G4double sq = 1.0 + ( 0.18 + 0.0015 * z )* << 194 G4double sq = ( 0.18 + 0.0015 * z ) / (Zi*Zi);
>> 195 if(tq2 < 0.2) sq *= (1.0 - tq2 + 0.5*tq2*tq2);
>> 196 else sq *= std::exp(-tq2);
>> 197 sq += 1.0;
163 // G4cout << "sq= " << sq << G4endl; 198 // G4cout << "sq= " << sq << G4endl;
164 199
165 // Screen length according to 200 // Screen length according to
166 // J.F.Ziegler and J.M.Manoyan, The stoppi 201 // J.F.Ziegler and J.M.Manoyan, The stopping of ions in compaunds,
167 // Nucl. Inst. & Meth. in Phys. Res. B35 ( 202 // Nucl. Inst. & Meth. in Phys. Res. B35 (1988) 215-228.
168 203
169 G4double lambda = 10.0 * vF *g4calc->A23(1 << 204 G4double lambda = 10.0 * vF / (zi13 * (6.0 + q));
>> 205 if(q < 0.2) lambda *= (1.0 - 0.66666667*q - q*q/9.0);
>> 206 else lambda *= std::pow(1.0-q, 0.666666);
>> 207
170 G4double lambda2 = lambda*lambda; 208 G4double lambda2 = lambda*lambda;
171 G4double xx = (0.5/q - 0.5)*G4Log(1.0 + la <<
172 209
173 effCharge *= q; << 210 G4double xx = (0.5/q - 0.5)/vFsq;
>> 211 if(lambda2 < 0.2) xx *= lambda2*(1.0 - 0.5*lambda2);
>> 212 else xx *= std::log(1.0 + lambda2);
>> 213
174 chargeCorrection = sq * (1.0 + xx); 214 chargeCorrection = sq * (1.0 + xx);
>> 215
175 } 216 }
176 // G4cout << "G4ionEffectiveCharge: charge= 217 // G4cout << "G4ionEffectiveCharge: charge= " << charge << " q= " << q
177 // << " chargeCor= " << chargeCorrec 218 // << " chargeCor= " << chargeCorrection
178 // << " e(MeV)= " << kineticEnergy << 219 // << " e(MeV)= " << kineticEnergy/MeV << G4endl;
179 return effCharge; 220 return effCharge;
180 } 221 }
181 222
182 //....oooOO0OOooo........oooOO0OOooo........oo 223 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 224
>> 225
183 226