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>> 26 // $Id: G4ionEffectiveCharge.cc 79394 2014-02-27 08:51:38Z gcosmo $
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 "G4Log.hh"
59 #include "G4Exp.hh" 60 #include "G4Exp.hh"
60 #include "G4Pow.hh" 61 #include "G4Pow.hh"
61 62
62 //....oooOO0OOooo........oooOO0OOooo........oo 63 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
63 64
>> 65 const G4double G4ionEffectiveCharge::inveplus = 1.0/CLHEP::eplus;
>> 66
64 G4ionEffectiveCharge::G4ionEffectiveCharge() 67 G4ionEffectiveCharge::G4ionEffectiveCharge()
65 { 68 {
66 chargeCorrection = 1.0; 69 chargeCorrection = 1.0;
67 energyHighLimit = 20.0*CLHEP::MeV; << 70 energyHighLimit = 20.0*MeV;
68 energyLowLimit = 1.0*CLHEP::keV; << 71 energyLowLimit = 1.0*keV;
69 energyBohr = 25.*CLHEP::keV; << 72 energyBohr = 25.*keV;
70 massFactor = CLHEP::amu_c2/(CLHEP::pro << 73 massFactor = amu_c2/(proton_mass_c2*keV);
71 minCharge = 1.0; 74 minCharge = 1.0;
>> 75 lastPart = 0;
>> 76 lastMat = 0;
72 lastKinEnergy = 0.0; 77 lastKinEnergy = 0.0;
73 effCharge = CLHEP::eplus; << 78 effCharge = eplus;
74 inveplus = 1.0/CLHEP::eplus; << 79 g4pow = G4Pow::GetInstance();
75 g4calc = G4Pow::GetInstance(); <<
76 } 80 }
77 81
78 //....oooOO0OOooo........oooOO0OOooo........oo 82 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
79 83
>> 84 G4ionEffectiveCharge::~G4ionEffectiveCharge()
>> 85 {}
>> 86
>> 87 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 88
80 G4double G4ionEffectiveCharge::EffectiveCharge 89 G4double G4ionEffectiveCharge::EffectiveCharge(const G4ParticleDefinition* p,
81 90 const G4Material* material,
82 << 91 G4double kineticEnergy)
83 { 92 {
84 if(p == lastPart && material == lastMat && k 93 if(p == lastPart && material == lastMat && kineticEnergy == lastKinEnergy)
85 return effCharge; 94 return effCharge;
86 95
87 lastPart = p; 96 lastPart = p;
88 lastMat = material; 97 lastMat = material;
89 lastKinEnergy = kineticEnergy; 98 lastKinEnergy = kineticEnergy;
90 99
91 G4double mass = p->GetPDGMass(); << 100 G4double mass = p->GetPDGMass();
92 effCharge = p->GetPDGCharge(); << 101 G4double charge = p->GetPDGCharge();
93 G4int Zi = G4lrint(effCharge*inveplus); << 102 G4double Zi = charge*inveplus;
>> 103
94 chargeCorrection = 1.0; 104 chargeCorrection = 1.0;
95 if(Zi <= 1) { return effCharge; } << 105 effCharge = charge;
96 106
97 // The aproximation of ion effective charge 107 // The aproximation of ion effective charge from:
98 // J.F.Ziegler, J.P. Biersack, U. Littmark 108 // J.F.Ziegler, J.P. Biersack, U. Littmark
99 // The Stopping and Range of Ions in Matter, 109 // The Stopping and Range of Ions in Matter,
100 // Vol.1, Pergamon Press, 1985 110 // Vol.1, Pergamon Press, 1985
101 // Fast ions or hadrons 111 // Fast ions or hadrons
102 G4double reducedEnergy = kineticEnergy * CLH << 112 G4double reducedEnergy = kineticEnergy * proton_mass_c2/mass ;
103 113
104 //G4cout << "e= " << reducedEnergy << " Zi= 114 //G4cout << "e= " << reducedEnergy << " Zi= " << Zi << " "
105 //<< material->GetName() << G4endl; 115 //<< material->GetName() << G4endl;
106 116
107 if(reducedEnergy > effCharge*energyHighLimit << 117 if(Zi < 1.5 || !material || reducedEnergy > Zi*energyHighLimit ) {
108 return effCharge; << 118 return charge;
109 } 119 }
110 G4double z = material->GetIonisation()->GetZ << 120 G4double z = material->GetIonisation()->GetZeffective();
111 reducedEnergy = std::max(reducedEnergy,energ 121 reducedEnergy = std::max(reducedEnergy,energyLowLimit);
112 122
113 // Helium ion case 123 // Helium ion case
114 if( Zi <= 2 ) { << 124 if( Zi < 2.5 ) {
115 125
116 static const G4double c[6] = 126 static const G4double c[6] =
117 {0.2865,0.1266,-0.001429,0.02402,-0.0113 127 {0.2865,0.1266,-0.001429,0.02402,-0.01135,0.001475};
118 128
119 G4double Q = std::max(0.0,G4Log(reducedEne 129 G4double Q = std::max(0.0,G4Log(reducedEnergy*massFactor));
120 G4double x = c[0]; 130 G4double x = c[0];
121 G4double y = 1.0; 131 G4double y = 1.0;
122 for (G4int i=1; i<6; ++i) { 132 for (G4int i=1; i<6; ++i) {
123 y *= Q; 133 y *= Q;
124 x += y * c[i] ; 134 x += y * c[i] ;
125 } 135 }
126 G4double ex = (x < 0.2) ? x * (1 - 0.5*x) << 136 G4double ex;
>> 137 if(x < 0.2) { ex = x * (1 - 0.5*x); }
>> 138 else { ex = 1. - G4Exp(-x); }
127 139
128 G4double tq = 7.6 - Q; 140 G4double tq = 7.6 - Q;
129 G4double tq2= tq*tq; 141 G4double tq2= tq*tq;
130 G4double tt = ( 0.007 + 0.00005 * z ); 142 G4double tt = ( 0.007 + 0.00005 * z );
131 if(tq2 < 0.2) { tt *= (1.0 - tq2 + 0.5*tq2 143 if(tq2 < 0.2) { tt *= (1.0 - tq2 + 0.5*tq2*tq2); }
132 else { tt *= G4Exp(-tq2); } 144 else { tt *= G4Exp(-tq2); }
133 145
134 effCharge *= (1.0 + tt) * std::sqrt(ex); << 146 effCharge = charge*(1.0 + tt) * std::sqrt(ex);
135 147
136 // Heavy ion case 148 // Heavy ion case
137 } else { 149 } else {
138 150
139 G4double zi13 = g4calc->Z13(Zi); << 151 G4double y;
>> 152 G4double zi13 = g4pow->A13(Zi);
140 G4double zi23 = zi13*zi13; 153 G4double zi23 = zi13*zi13;
141 154
142 // v1 is ion velocity in vF unit 155 // v1 is ion velocity in vF unit
143 G4double eF = material->GetIonisation()- 156 G4double eF = material->GetIonisation()->GetFermiEnergy();
144 G4double v1sq = reducedEnergy/eF; 157 G4double v1sq = reducedEnergy/eF;
145 G4double vFsq = eF/energyBohr; 158 G4double vFsq = eF/energyBohr;
146 G4double vF = std::sqrt(vFsq); << 159 G4double vF = std::sqrt(eF/energyBohr);
>> 160
>> 161 // Faster than Fermi velocity
>> 162 if ( v1sq > 1.0 ) {
>> 163 y = vF * std::sqrt(v1sq) * ( 1.0 + 0.2/v1sq ) / zi23 ;
147 164
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 165 // Slower than Fermi velocity
152 : 0.692308 * vF * (1.0 + 0.666666*v1sq + << 166 } else {
>> 167 y = 0.692308 * vF * (1.0 + 0.666666*v1sq + v1sq*v1sq/15.0) / zi23 ;
>> 168 }
153 169
154 G4double y3 = G4Exp(0.3*G4Log(y)); << 170 G4double q;
>> 171 G4double y3 = std::pow(y, 0.3) ;
155 // G4cout<<"y= "<<y<<" y3= "<<y3<<" v1= "< 172 // G4cout<<"y= "<<y<<" y3= "<<y3<<" v1= "<<v1<<" vF= "<<vF<<G4endl;
156 G4double q = std::max(1.0 - G4Exp( 0.803*y << 173 q = 1.0 - G4Exp( 0.803*y3 - 1.3167*y3*y3 - 0.38157*y - 0.008983*y*y);
157 - 0.00898 << 174 q = std::max(q, minCharge/Zi);
>> 175
>> 176 effCharge = q*charge;
158 177
159 // compute charge correction << 178 G4double tq = 7.6 - G4Log(reducedEnergy/keV);
160 G4double tq = 7.6 - G4Log(reducedEnergy/CL <<
161 G4double tq2= tq*tq; 179 G4double tq2= tq*tq;
162 G4double sq = 1.0 + ( 0.18 + 0.0015 * z )* << 180 G4double sq = 1.0 + ( 0.18 + 0.0015 * z )*G4Exp(-tq2)/ (Zi*Zi);
>> 181
163 // G4cout << "sq= " << sq << G4endl; 182 // G4cout << "sq= " << sq << G4endl;
164 183
165 // Screen length according to 184 // Screen length according to
166 // J.F.Ziegler and J.M.Manoyan, The stoppi 185 // J.F.Ziegler and J.M.Manoyan, The stopping of ions in compaunds,
167 // Nucl. Inst. & Meth. in Phys. Res. B35 ( 186 // Nucl. Inst. & Meth. in Phys. Res. B35 (1988) 215-228.
168 187
169 G4double lambda = 10.0 * vF *g4calc->A23(1 << 188 G4double lambda = 10.0 * vF *g4pow->A23(1.0 - q)/ (zi13 * (6.0 + q));
>> 189
170 G4double lambda2 = lambda*lambda; 190 G4double lambda2 = lambda*lambda;
>> 191
171 G4double xx = (0.5/q - 0.5)*G4Log(1.0 + la 192 G4double xx = (0.5/q - 0.5)*G4Log(1.0 + lambda2)/vFsq;
172 193
173 effCharge *= q; <<
174 chargeCorrection = sq * (1.0 + xx); 194 chargeCorrection = sq * (1.0 + xx);
>> 195
175 } 196 }
176 // G4cout << "G4ionEffectiveCharge: charge= 197 // G4cout << "G4ionEffectiveCharge: charge= " << charge << " q= " << q
177 // << " chargeCor= " << chargeCorrec 198 // << " chargeCor= " << chargeCorrection
178 // << " e(MeV)= " << kineticEnergy << 199 // << " e(MeV)= " << kineticEnergy/MeV << G4endl;
179 return effCharge; 200 return effCharge;
180 } 201 }
181 202
182 //....oooOO0OOooo........oooOO0OOooo........oo 203 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 204
>> 205
183 206