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>> 26 // $Id: G4ionEffectiveCharge.cc,v 1.25 2009/10/29 16:57:39 vnivanch Exp $
>> 27 // GEANT4 tag $Name: geant4-09-03 $
26 // 28 //
27 // ------------------------------------------- 29 // -------------------------------------------------------------------
28 // 30 //
29 // GEANT4 Class file 31 // GEANT4 Class file
30 // 32 //
31 // 33 //
32 // File name: G4ionEffectiveCharge 34 // File name: G4ionEffectiveCharge
33 // 35 //
34 // Author: Vladimir Ivanchenko 36 // Author: Vladimir Ivanchenko
35 // 37 //
36 // Creation date: 07.05.2002 38 // Creation date: 07.05.2002
37 // 39 //
38 // Modifications: 40 // Modifications:
39 // 12.09.2004 Set low energy limit to 1 keV (V 41 // 12.09.2004 Set low energy limit to 1 keV (V.Ivanchenko)
40 // 25.01.2005 Add protection - min Charge 0.1 42 // 25.01.2005 Add protection - min Charge 0.1 eplus (V.Ivanchenko)
41 // 28.04.2006 Set upper energy limit to 50 MeV 43 // 28.04.2006 Set upper energy limit to 50 MeV (V.Ivanchenko)
42 // 23.05.2006 Set upper energy limit to Z*10 M 44 // 23.05.2006 Set upper energy limit to Z*10 MeV (V.Ivanchenko)
43 // 15.08.2006 Add protection for not defined m 45 // 15.08.2006 Add protection for not defined material (V.Ivanchenko)
44 // 27-09-2007 Use Fermi energy from material, 46 // 27-09-2007 Use Fermi energy from material, optimazed formulas (V.Ivanchenko)
45 // 47 //
46 48
47 // ------------------------------------------- 49 // -------------------------------------------------------------------
48 // 50 //
49 //....oooOO0OOooo........oooOO0OOooo........oo 51 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
50 //....oooOO0OOooo........oooOO0OOooo........oo 52 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
51 53
52 #include "G4ionEffectiveCharge.hh" 54 #include "G4ionEffectiveCharge.hh"
53 #include "G4PhysicalConstants.hh" <<
54 #include "G4SystemOfUnits.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" <<
59 #include "G4Exp.hh" <<
60 #include "G4Pow.hh" <<
61 58
62 //....oooOO0OOooo........oooOO0OOooo........oo 59 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
63 60
64 G4ionEffectiveCharge::G4ionEffectiveCharge() 61 G4ionEffectiveCharge::G4ionEffectiveCharge()
65 { 62 {
66 chargeCorrection = 1.0; 63 chargeCorrection = 1.0;
67 energyHighLimit = 20.0*CLHEP::MeV; << 64 energyHighLimit = 20.0*MeV;
68 energyLowLimit = 1.0*CLHEP::keV; << 65 energyLowLimit = 1.0*keV;
69 energyBohr = 25.*CLHEP::keV; << 66 energyBohr = 25.*keV;
70 massFactor = CLHEP::amu_c2/(CLHEP::pro << 67 massFactor = amu_c2/(proton_mass_c2*keV);
71 minCharge = 1.0; 68 minCharge = 1.0;
>> 69 lastPart = 0;
>> 70 lastMat = 0;
72 lastKinEnergy = 0.0; 71 lastKinEnergy = 0.0;
73 effCharge = CLHEP::eplus; << 72 effCharge = eplus;
74 inveplus = 1.0/CLHEP::eplus; << 73 nist = G4NistManager::Instance();
75 g4calc = G4Pow::GetInstance(); <<
76 } 74 }
77 75
78 //....oooOO0OOooo........oooOO0OOooo........oo 76 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
79 77
>> 78 G4ionEffectiveCharge::~G4ionEffectiveCharge()
>> 79 {}
>> 80
>> 81 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 82
80 G4double G4ionEffectiveCharge::EffectiveCharge 83 G4double G4ionEffectiveCharge::EffectiveCharge(const G4ParticleDefinition* p,
81 84 const G4Material* material,
82 << 85 G4double kineticEnergy)
83 { 86 {
84 if(p == lastPart && material == lastMat && k 87 if(p == lastPart && material == lastMat && kineticEnergy == lastKinEnergy)
85 return effCharge; 88 return effCharge;
86 89
87 lastPart = p; 90 lastPart = p;
88 lastMat = material; 91 lastMat = material;
89 lastKinEnergy = kineticEnergy; 92 lastKinEnergy = kineticEnergy;
90 93
91 G4double mass = p->GetPDGMass(); << 94 G4double mass = p->GetPDGMass();
92 effCharge = p->GetPDGCharge(); << 95 G4double charge = p->GetPDGCharge();
93 G4int Zi = G4lrint(effCharge*inveplus); << 96 G4double Zi = charge/eplus;
>> 97
94 chargeCorrection = 1.0; 98 chargeCorrection = 1.0;
95 if(Zi <= 1) { return effCharge; } << 99 effCharge = charge;
96 100
97 // The aproximation of ion effective charge 101 // The aproximation of ion effective charge from:
98 // J.F.Ziegler, J.P. Biersack, U. Littmark 102 // J.F.Ziegler, J.P. Biersack, U. Littmark
99 // The Stopping and Range of Ions in Matter, 103 // The Stopping and Range of Ions in Matter,
100 // Vol.1, Pergamon Press, 1985 104 // Vol.1, Pergamon Press, 1985
101 // Fast ions or hadrons 105 // Fast ions or hadrons
102 G4double reducedEnergy = kineticEnergy * CLH << 106 G4double reducedEnergy = kineticEnergy * proton_mass_c2/mass ;
103 107
104 //G4cout << "e= " << reducedEnergy << " Zi= << 108 //G4cout << "e= " << reducedEnergy << " Zi= " << Zi << " " << material->GetName() << G4endl;
105 //<< material->GetName() << G4endl; <<
106 109
107 if(reducedEnergy > effCharge*energyHighLimit << 110 if( reducedEnergy > Zi*energyHighLimit || Zi < 1.5 || !material) return charge;
108 return effCharge; << 111
109 } << 112 G4double z = material->GetIonisation()->GetZeffective();
110 G4double z = material->GetIonisation()->GetZ <<
111 reducedEnergy = std::max(reducedEnergy,energ 113 reducedEnergy = std::max(reducedEnergy,energyLowLimit);
112 114
113 // Helium ion case 115 // Helium ion case
114 if( Zi <= 2 ) { << 116 if( Zi < 2.5 ) {
115 117
116 static const G4double c[6] = << 118 static G4double c[6] = {0.2865, 0.1266, -0.001429,
117 {0.2865,0.1266,-0.001429,0.02402,-0.0113 << 119 0.02402,-0.01135, 0.001475} ;
118 120
119 G4double Q = std::max(0.0,G4Log(reducedEne << 121 G4double Q = std::max(0.0,std::log(reducedEnergy*massFactor));
120 G4double x = c[0]; 122 G4double x = c[0];
121 G4double y = 1.0; 123 G4double y = 1.0;
122 for (G4int i=1; i<6; ++i) { << 124 for (G4int i=1; i<6; i++) {
123 y *= Q; 125 y *= Q;
124 x += y * c[i] ; 126 x += y * c[i] ;
125 } 127 }
126 G4double ex = (x < 0.2) ? x * (1 - 0.5*x) << 128 G4double ex;
>> 129 if(x < 0.2) ex = x * (1 - 0.5*x);
>> 130 else ex = 1. - std::exp(-x);
127 131
128 G4double tq = 7.6 - Q; 132 G4double tq = 7.6 - Q;
129 G4double tq2= tq*tq; 133 G4double tq2= tq*tq;
130 G4double tt = ( 0.007 + 0.00005 * z ); 134 G4double tt = ( 0.007 + 0.00005 * z );
131 if(tq2 < 0.2) { tt *= (1.0 - tq2 + 0.5*tq2 << 135 if(tq2 < 0.2) tt *= (1.0 - tq2 + 0.5*tq2*tq2);
132 else { tt *= G4Exp(-tq2); } << 136 else tt *= std::exp(-tq2);
133 137
134 effCharge *= (1.0 + tt) * std::sqrt(ex); << 138 effCharge = charge*(1.0 + tt) * std::sqrt(ex);
135 139
136 // Heavy ion case 140 // Heavy ion case
137 } else { 141 } else {
138 142
139 G4double zi13 = g4calc->Z13(Zi); << 143 G4double y;
>> 144 // = nist->GetZ13(z);
>> 145 //G4double z23 = y*y;
>> 146 G4double zi13 = nist->GetZ13(Zi);
140 G4double zi23 = zi13*zi13; 147 G4double zi23 = zi13*zi13;
>> 148 // G4double e = std::max(reducedEnergy,energyBohr/z23);
>> 149 //G4double e = reducedEnergy;
141 150
142 // v1 is ion velocity in vF unit 151 // v1 is ion velocity in vF unit
143 G4double eF = material->GetIonisation()- 152 G4double eF = material->GetIonisation()->GetFermiEnergy();
144 G4double v1sq = reducedEnergy/eF; 153 G4double v1sq = reducedEnergy/eF;
145 G4double vFsq = eF/energyBohr; 154 G4double vFsq = eF/energyBohr;
146 G4double vF = std::sqrt(vFsq); << 155 G4double vF = std::sqrt(eF/energyBohr);
>> 156
>> 157 // Faster than Fermi velocity
>> 158 if ( v1sq > 1.0 ) {
>> 159 y = vF * std::sqrt(v1sq) * ( 1.0 + 0.2/v1sq ) / zi23 ;
147 160
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 161 // Slower than Fermi velocity
152 : 0.692308 * vF * (1.0 + 0.666666*v1sq + << 162 } else {
>> 163 y = 0.692308 * vF * (1.0 + 0.666666*v1sq + v1sq*v1sq/15.0) / zi23 ;
>> 164 }
153 165
154 G4double y3 = G4Exp(0.3*G4Log(y)); << 166 G4double q;
>> 167 G4double y3 = std::pow(y, 0.3) ;
155 // G4cout<<"y= "<<y<<" y3= "<<y3<<" v1= "< 168 // G4cout<<"y= "<<y<<" y3= "<<y3<<" v1= "<<v1<<" vF= "<<vF<<G4endl;
156 G4double q = std::max(1.0 - G4Exp( 0.803*y << 169 q = 1.0 - std::exp( 0.803*y3 - 1.3167*y3*y3 - 0.38157*y - 0.008983*y*y ) ;
157 - 0.00898 << 170
>> 171 //y *= 0.77;
>> 172 //y *= (0.75 + 0.52/Zi);
>> 173
>> 174 //if( y < 0.2 ) q = y*(1.0 - 0.5*y);
>> 175 //else q = 1.0 - std::exp(-y);
>> 176
>> 177 G4double qmin = minCharge/Zi;
>> 178 if(q < qmin) q = qmin;
>> 179
>> 180 effCharge = q*charge;
>> 181
>> 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 */
158 190
159 // compute charge correction << 191 G4double tq = 7.6 - std::log(reducedEnergy/keV);
160 G4double tq = 7.6 - G4Log(reducedEnergy/CL <<
161 G4double tq2= tq*tq; 192 G4double tq2= tq*tq;
162 G4double sq = 1.0 + ( 0.18 + 0.0015 * z )* << 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;
163 // G4cout << "sq= " << sq << G4endl; 197 // G4cout << "sq= " << sq << G4endl;
164 198
165 // Screen length according to 199 // Screen length according to
166 // J.F.Ziegler and J.M.Manoyan, The stoppi 200 // J.F.Ziegler and J.M.Manoyan, The stopping of ions in compaunds,
167 // Nucl. Inst. & Meth. in Phys. Res. B35 ( 201 // Nucl. Inst. & Meth. in Phys. Res. B35 (1988) 215-228.
168 202
169 G4double lambda = 10.0 * vF *g4calc->A23(1 << 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
170 G4double lambda2 = lambda*lambda; 207 G4double lambda2 = lambda*lambda;
171 G4double xx = (0.5/q - 0.5)*G4Log(1.0 + la <<
172 208
173 effCharge *= q; << 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
174 chargeCorrection = sq * (1.0 + xx); 213 chargeCorrection = sq * (1.0 + xx);
>> 214
175 } 215 }
176 // G4cout << "G4ionEffectiveCharge: charge= 216 // G4cout << "G4ionEffectiveCharge: charge= " << charge << " q= " << q
177 // << " chargeCor= " << chargeCorrec 217 // << " chargeCor= " << chargeCorrection
178 // << " e(MeV)= " << kineticEnergy << 218 // << " e(MeV)= " << kineticEnergy/MeV << G4endl;
179 return effCharge; 219 return effCharge;
180 } 220 }
181 221
182 //....oooOO0OOooo........oooOO0OOooo........oo 222 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 223
>> 224
183 225