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>> 26 // $Id: G4IonParametrisedLossModel.icc 66241 2012-12-13 18:34:42Z gunter $
26 // 27 //
27 // =========================================== 28 // ===========================================================================
28 // GEANT4 class 29 // GEANT4 class
29 // 30 //
30 // Class: G4IonParametrisedLoss 31 // Class: G4IonParametrisedLossModel
31 // 32 //
32 // Base class: G4VEmModel (utils) 33 // Base class: G4VEmModel (utils)
33 // 34 //
34 // Author: Anton Lechner (Anton. 35 // Author: Anton Lechner (Anton.Lechner@cern.ch)
35 // 36 //
36 // First implementation: 10. 11. 2008 37 // First implementation: 10. 11. 2008
37 // 38 //
38 // Modifications: 03. 02. 2009 - Bug fix itera 39 // Modifications: 03. 02. 2009 - Bug fix iterators (AL)
39 // 11. 03. 2009 - Introduced ne 40 // 11. 03. 2009 - Introduced new table handler (G4IonDEDXHandler)
40 // and modified 41 // and modified method to add/remove tables
41 // (tables are n 42 // (tables are now built in initialisation phase),
42 // Minor bug fix 43 // Minor bug fix in ComputeDEDXPerVolume (AL)
43 // 20. 11. 2009 - Added set-met 44 // 20. 11. 2009 - Added set-method for energy loss limit (AL)
44 // 04. 11. 2010 - Moved virtual 45 // 04. 11. 2010 - Moved virtual methods to the source (VI)
45 // 46 //
46 // Class description: 47 // Class description:
47 // Model for computing the energy loss of i 48 // Model for computing the energy loss of ions by employing a
48 // parameterisation of dE/dx tables (defaul 49 // parameterisation of dE/dx tables (default ICRU 73 tables). For
49 // ion-material combinations and/or project 50 // ion-material combinations and/or projectile energies not covered
50 // by this model, the G4BraggIonModel and G 51 // by this model, the G4BraggIonModel and G4BetheBloch models are
51 // employed. 52 // employed.
52 // 53 //
53 // Comments: 54 // Comments:
54 // 55 //
55 // =========================================== 56 // ===========================================================================
56 57
57 inline G4double G4IonParametrisedLossModel::De 58 inline G4double G4IonParametrisedLossModel::DeltaRayMeanEnergyTransferRate(
58 const G4 59 const G4Material* material,
59 const G4ParticleDefinition 60 const G4ParticleDefinition* particle,
60 G4double kineticEnergy, 61 G4double kineticEnergy,
61 G4double cutEnergy) { 62 G4double cutEnergy) {
62 63
63 // ############## Mean energy transferred to 64 // ############## Mean energy transferred to delta-rays ###################
64 // Computes the mean energy transfered to de 65 // Computes the mean energy transfered to delta-rays per unit length,
65 // considering only delta-rays with energies 66 // considering only delta-rays with energies above the energy threshold
66 // (energy cut) 67 // (energy cut)
67 // 68 //
68 // The mean energy transfer rate is derived 69 // The mean energy transfer rate is derived by using the differential
69 // cross section given in the references bel 70 // cross section given in the references below.
70 // 71 //
71 // See Geant4 physics reference manual (vers 72 // See Geant4 physics reference manual (version 9.1), section 9.1.3
72 // 73 //
73 // Ref.: W.M. Yao et al, Jour. of Phys. G 33 74 // Ref.: W.M. Yao et al, Jour. of Phys. G 33 (2006) 1.
74 // B. Rossi, High energy particles, Ne 75 // B. Rossi, High energy particles, New York, NY: Prentice-Hall (1952).
75 // 76 //
76 // (Implementation adapted from G4BraggIonMo 77 // (Implementation adapted from G4BraggIonModel)
77 78
78 79
79 // *** Variables: 80 // *** Variables:
80 // kineticEnergy = kinetic energy of proje 81 // kineticEnergy = kinetic energy of projectile
81 // totEnergy = total energy of project 82 // totEnergy = total energy of projectile, i.e. kinetic energy
82 // plus rest energy (Mc^2) 83 // plus rest energy (Mc^2)
83 // betaSquared = beta of projectile squa 84 // betaSquared = beta of projectile squared, calculated as
84 // beta^2 = 1 - 1 / (E/ 85 // beta^2 = 1 - 1 / (E/Mc^2)^2
85 // = T * ( E + M 86 // = T * ( E + Mc^2 ) / E^2
86 // where T = kineticEnergy 87 // where T = kineticEnergy, E = totEnergy
87 // cutEnergy = energy threshold for se 88 // cutEnergy = energy threshold for secondary particle production
88 // i.e. energy cut, below 89 // i.e. energy cut, below which energy transfered to
89 // electrons is treated as 90 // electrons is treated as continuous loss of projectile
90 // maxKinEnergy = maximum energy transfer 91 // maxKinEnergy = maximum energy transferable to secondary electrons
91 // meanRate = mean kinetic energy of 92 // meanRate = mean kinetic energy of delta ray (per unit length)
92 // (above cutEnergy) 93 // (above cutEnergy)
93 94
94 G4double meanRate = 0.0; 95 G4double meanRate = 0.0;
95 96
96 G4double maxKinEnergy = MaxSecondaryEnergy(p 97 G4double maxKinEnergy = MaxSecondaryEnergy(particle, kineticEnergy);
97 98
98 if (cutEnergy < maxKinEnergy) { 99 if (cutEnergy < maxKinEnergy) {
99 100
100 G4double totalEnergy = kineticEnergy + ca 101 G4double totalEnergy = kineticEnergy + cacheMass;
101 G4double betaSquared = kineticEnergy * 102 G4double betaSquared = kineticEnergy *
102 (totalEnergy + cacheMass) / 103 (totalEnergy + cacheMass) / (totalEnergy * totalEnergy);
103 104
104 G4double cutMaxEnergyRatio = cutEnergy / m 105 G4double cutMaxEnergyRatio = cutEnergy / maxKinEnergy;
105 106
106 meanRate = 107 meanRate =
107 (- std::log(cutMaxEnergyRatio) - (1.0 108 (- std::log(cutMaxEnergyRatio) - (1.0 - cutMaxEnergyRatio) * betaSquared) *
108 CLHEP::twopi_mc2_rcl2 * 109 CLHEP::twopi_mc2_rcl2 *
109 (material->GetTotNbOfElectPerVolume()) 110 (material->GetTotNbOfElectPerVolume()) / betaSquared;
110 111
111 meanRate *= GetChargeSquareRatio(particle, 112 meanRate *= GetChargeSquareRatio(particle, material, kineticEnergy);
112 } 113 }
113 114
114 return meanRate; 115 return meanRate;
115 } 116 }
116 117
117 inline 118 inline
118 void G4IonParametrisedLossModel::UpdateCache( 119 void G4IonParametrisedLossModel::UpdateCache(
119 const G4ParticleD 120 const G4ParticleDefinition* particle) {
120 121
121 cacheParticle = particle; 122 cacheParticle = particle;
122 cacheMass = particle -> GetPDGMass(); 123 cacheMass = particle -> GetPDGMass();
123 cacheElecMassRatio = CLHEP::electron_mass_c2 124 cacheElecMassRatio = CLHEP::electron_mass_c2 / cacheMass;
124 G4double q = particle -> GetPDGCharge() / CL 125 G4double q = particle -> GetPDGCharge() / CLHEP::eplus;
125 cacheChargeSquare = q * q; 126 cacheChargeSquare = q * q;
126 } 127 }
127 128
128 inline 129 inline
129 LossTableList::iterator G4IonParametrisedLossM 130 LossTableList::iterator G4IonParametrisedLossModel::IsApplicable(
130 const G4ParticleDefinition 131 const G4ParticleDefinition* particle, // Projectile (ion)
131 const G4Material* material 132 const G4Material* material) { // Target material
132 133
133 LossTableList::iterator iter = lossTableList 134 LossTableList::iterator iter = lossTableList.end();
134 LossTableList::iterator iterTables = lossTab 135 LossTableList::iterator iterTables = lossTableList.begin();
135 LossTableList::iterator iterTables_end = los 136 LossTableList::iterator iterTables_end = lossTableList.end();
136 137
137 for(;iterTables != iterTables_end; iterTable 138 for(;iterTables != iterTables_end; iterTables++) {
138 G4bool isApplicable = (*iterTables) -> 139 G4bool isApplicable = (*iterTables) ->
139 IsApplicable(particle, 140 IsApplicable(particle, material);
140 if(isApplicable) { 141 if(isApplicable) {
141 iter = iterTables; 142 iter = iterTables;
142 break; 143 break;
143 } 144 }
144 } 145 }
145 146
146 return iter; 147 return iter;
147 } 148 }
148 149
149 150
150 inline 151 inline
151 void G4IonParametrisedLossModel::SetEnergyLoss 152 void G4IonParametrisedLossModel::SetEnergyLossLimit(
152 G4 153 G4double ionEnergyLossLimit) {
153 154
154 if(ionEnergyLossLimit > 0 && ionEnergyLossLi 155 if(ionEnergyLossLimit > 0 && ionEnergyLossLimit <=1) {
155 156
156 energyLossLimit = ionEnergyLossLimit; 157 energyLossLimit = ionEnergyLossLimit;
157 } 158 }
158 } 159 }
159 160