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26 /// \file medical/fanoCavity2/src/MyMollerBhab << 26 // $Id: MyMollerBhabhaModel.cc,v 1.1 2007/10/15 16:20:23 maire Exp $
27 /// \brief Implementation of the MyMollerBhabh << 27 // GEANT4 tag $Name: geant4-09-02-patch-04 $
28 // <<
29 // 28 //
30 //....oooOO0OOooo........oooOO0OOooo........oo 29 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
31 //....oooOO0OOooo........oooOO0OOooo........oo 30 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
32 31
33 #include "MyMollerBhabhaModel.hh" 32 #include "MyMollerBhabhaModel.hh"
34 33
35 #include "G4PhysicalConstants.hh" <<
36 #include "G4SystemOfUnits.hh" <<
37 <<
38 //....oooOO0OOooo........oooOO0OOooo........oo 34 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
39 35
40 using namespace std; 36 using namespace std;
41 37
42 MyMollerBhabhaModel::MyMollerBhabhaModel(const << 38 MyMollerBhabhaModel::MyMollerBhabhaModel(const G4ParticleDefinition* p,
43 : G4MollerBhabhaModel(p, nam) << 39 const G4String& nam)
>> 40 : G4MollerBhabhaModel(p,nam)
44 {} 41 {}
45 42
46 //....oooOO0OOooo........oooOO0OOooo........oo 43 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
47 44
48 MyMollerBhabhaModel::~MyMollerBhabhaModel() {} << 45 MyMollerBhabhaModel::~MyMollerBhabhaModel()
>> 46 {}
49 47
50 //....oooOO0OOooo........oooOO0OOooo........oo 48 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
51 49
52 G4double MyMollerBhabhaModel::ComputeDEDXPerVo << 50 G4double MyMollerBhabhaModel::ComputeDEDXPerVolume(
53 << 51 const G4Material* material,
54 << 52 const G4ParticleDefinition* p,
>> 53 G4double kineticEnergy,
>> 54 G4double cutEnergy)
55 { 55 {
56 if (!particle) SetParticle(p); << 56 if(!particle) SetParticle(p);
57 // calculate the dE/dx due to the ionization 57 // calculate the dE/dx due to the ionization by Seltzer-Berger formula
58 << 58
59 G4double electronDensity = material->GetElec 59 G4double electronDensity = material->GetElectronDensity();
60 G4double Zeff = electronDensity / material-> << 60 G4double Zeff = electronDensity/material->GetTotNbOfAtomsPerVolume();
61 G4double th = 0.25 * sqrt(Zeff) * keV; << 61 G4double th = 0.25*sqrt(Zeff)*keV;
62 G4double tkin = kineticEnergy; << 62 G4double tkin = kineticEnergy;
63 G4bool lowEnergy = false; << 63 G4bool lowEnergy = false;
64 if (kineticEnergy < th) { 64 if (kineticEnergy < th) {
65 tkin = th; 65 tkin = th;
66 lowEnergy = true; 66 lowEnergy = true;
67 } 67 }
68 G4double tau = tkin / electron_mass_c2; << 68 G4double tau = tkin/electron_mass_c2;
69 G4double gam = tau + 1.0; << 69 G4double gam = tau + 1.0;
70 G4double gamma2 = gam * gam; << 70 G4double gamma2= gam*gam;
71 G4double beta2 = 1. - 1. / gamma2; << 71 G4double beta2 = 1. - 1./gamma2;
72 // G4double bg2 = beta2*gamma2; << 72 //G4double bg2 = beta2*gamma2;
73 << 73
74 G4double eexc = material->GetIonisation()->G << 74 G4double eexc = material->GetIonisation()->GetMeanExcitationEnergy();
75 eexc /= electron_mass_c2; << 75 eexc /= electron_mass_c2;
76 G4double eexc2 = eexc * eexc; << 76 G4double eexc2 = eexc*eexc;
77 77
78 G4double d = min(cutEnergy, MaxSecondaryEner << 78 G4double d = min(cutEnergy, MaxSecondaryEnergy(p, tkin))/electron_mass_c2;
79 G4double dedx; 79 G4double dedx;
80 80
81 // electron 81 // electron
82 if (isElectron) { 82 if (isElectron) {
83 dedx = log(2.0 * (tau + 2.0) / eexc2) - 1. <<
84 + (0.5 * d * d + (2.0 * tau + 1.) * <<
85 83
86 // positron << 84 dedx = log(2.0*(tau + 2.0)/eexc2) - 1.0 - beta2
87 } << 85 + log((tau-d)*d) + tau/(tau-d)
88 else { << 86 + (0.5*d*d + (2.0*tau + 1.)*log(1. - d/tau))/gamma2;
89 G4double d2 = d * d * 0.5; << 87
90 G4double d3 = d2 * d / 1.5; << 88 //positron
91 G4double d4 = d3 * d * 3.75; << 89 } else {
92 G4double y = 1.0 / (1.0 + gam); << 90
93 dedx = << 91 G4double d2 = d*d*0.5;
94 log(2.0 * (tau + 2.0) / eexc2) + log(tau << 92 G4double d3 = d2*d/1.5;
95 - beta2 * (tau + 2.0 * d - y * (3.0 * d2 << 93 G4double d4 = d3*d*3.75;
96 } << 94 G4double y = 1.0/(1.0 + gam);
97 << 95 dedx = log(2.0*(tau + 2.0)/eexc2) + log(tau*d)
98 // do not apply density correction << 96 - beta2*(tau + 2.0*d - y*(3.0*d2
99 // G4double cden = material->GetIonisation( << 97 + y*(d - d3 + y*(d2 - tau*d3 + d4))))/tau;
100 // G4double mden = material->GetIonisation( << 98 }
101 // G4double aden = material->GetIonisation( << 99
102 // G4double x0den = material->GetIonisation( << 100 //do not apply density correction
103 // G4double x1den = material->GetIonisation( << 101 //G4double cden = material->GetIonisation()->GetCdensity();
104 // G4double x = log(bg2)/twoln10; << 102 //G4double mden = material->GetIonisation()->GetMdensity();
105 << 103 //G4double aden = material->GetIonisation()->GetAdensity();
106 // if (x >= x0den) { << 104 //G4double x0den = material->GetIonisation()->GetX0density();
107 // dedx -= twoln10*x - cden; << 105 //G4double x1den = material->GetIonisation()->GetX1density();
108 // if (x < x1den) dedx -= aden*pow(x1den-x << 106 //G4double x = log(bg2)/twoln10;
109 // } << 107
>> 108 //if (x >= x0den) {
>> 109 // dedx -= twoln10*x - cden;
>> 110 // if (x < x1den) dedx -= aden*pow(x1den-x, mden);
>> 111 //}
110 112
111 // now you can compute the total ionization 113 // now you can compute the total ionization loss
112 dedx *= twopi_mc2_rcl2 * electronDensity / b << 114 dedx *= twopi_mc2_rcl2*electronDensity/beta2;
113 if (dedx < 0.0) dedx = 0.0; 115 if (dedx < 0.0) dedx = 0.0;
114 116
115 // lowenergy extrapolation 117 // lowenergy extrapolation
116 118
117 if (lowEnergy) { 119 if (lowEnergy) {
118 if (kineticEnergy >= lowLimit) << 120
119 dedx *= sqrt(tkin / kineticEnergy); << 121 if (kineticEnergy >= lowLimit) dedx *= sqrt(tkin/kineticEnergy);
120 else << 122 else dedx *= sqrt(tkin*kineticEnergy)/lowLimit;
121 dedx *= sqrt(tkin * kineticEnergy) / low << 123
122 } 124 }
123 return dedx; 125 return dedx;
124 } 126 }
125 127
126 //....oooOO0OOooo........oooOO0OOooo........oo 128 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
127 129