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>> 26 // $Id: G4IonParametrisedLossModel.icc,v 1.7 2010/11/04 12:21:47 vnivanch Exp $
>> 27 // GEANT4 tag $Name: geant4-09-04 $
26 // 28 //
27 // =========================================== 29 // ===========================================================================
28 // GEANT4 class 30 // GEANT4 class
29 // 31 //
30 // Class: G4IonParametrisedLoss 32 // Class: G4IonParametrisedLossModel
31 // 33 //
32 // Base class: G4VEmModel (utils) 34 // Base class: G4VEmModel (utils)
33 // 35 //
34 // Author: Anton Lechner (Anton. 36 // Author: Anton Lechner (Anton.Lechner@cern.ch)
35 // 37 //
36 // First implementation: 10. 11. 2008 38 // First implementation: 10. 11. 2008
37 // 39 //
38 // Modifications: 03. 02. 2009 - Bug fix itera 40 // Modifications: 03. 02. 2009 - Bug fix iterators (AL)
39 // 11. 03. 2009 - Introduced ne 41 // 11. 03. 2009 - Introduced new table handler (G4IonDEDXHandler)
40 // and modified 42 // and modified method to add/remove tables
41 // (tables are n 43 // (tables are now built in initialisation phase),
42 // Minor bug fix 44 // Minor bug fix in ComputeDEDXPerVolume (AL)
43 // 20. 11. 2009 - Added set-met 45 // 20. 11. 2009 - Added set-method for energy loss limit (AL)
44 // 04. 11. 2010 - Moved virtual 46 // 04. 11. 2010 - Moved virtual methods to the source (VI)
45 // 47 //
46 // Class description: 48 // Class description:
47 // Model for computing the energy loss of i 49 // Model for computing the energy loss of ions by employing a
48 // parameterisation of dE/dx tables (defaul 50 // parameterisation of dE/dx tables (default ICRU 73 tables). For
49 // ion-material combinations and/or project 51 // ion-material combinations and/or projectile energies not covered
50 // by this model, the G4BraggIonModel and G 52 // by this model, the G4BraggIonModel and G4BetheBloch models are
51 // employed. 53 // employed.
52 // 54 //
53 // Comments: 55 // Comments:
54 // 56 //
55 // =========================================== 57 // ===========================================================================
56 58
57 inline G4double G4IonParametrisedLossModel::De 59 inline G4double G4IonParametrisedLossModel::DeltaRayMeanEnergyTransferRate(
58 const G4 60 const G4Material* material,
59 const G4ParticleDefinition 61 const G4ParticleDefinition* particle,
60 G4double kineticEnergy, 62 G4double kineticEnergy,
61 G4double cutEnergy) { 63 G4double cutEnergy) {
62 64
63 // ############## Mean energy transferred to 65 // ############## Mean energy transferred to delta-rays ###################
64 // Computes the mean energy transfered to de 66 // Computes the mean energy transfered to delta-rays per unit length,
65 // considering only delta-rays with energies 67 // considering only delta-rays with energies above the energy threshold
66 // (energy cut) 68 // (energy cut)
67 // 69 //
68 // The mean energy transfer rate is derived 70 // The mean energy transfer rate is derived by using the differential
69 // cross section given in the references bel 71 // cross section given in the references below.
70 // 72 //
71 // See Geant4 physics reference manual (vers 73 // See Geant4 physics reference manual (version 9.1), section 9.1.3
72 // 74 //
73 // Ref.: W.M. Yao et al, Jour. of Phys. G 33 75 // Ref.: W.M. Yao et al, Jour. of Phys. G 33 (2006) 1.
74 // B. Rossi, High energy particles, Ne 76 // B. Rossi, High energy particles, New York, NY: Prentice-Hall (1952).
75 // 77 //
76 // (Implementation adapted from G4BraggIonMo 78 // (Implementation adapted from G4BraggIonModel)
77 79
78 80
79 // *** Variables: 81 // *** Variables:
80 // kineticEnergy = kinetic energy of proje 82 // kineticEnergy = kinetic energy of projectile
81 // totEnergy = total energy of project 83 // totEnergy = total energy of projectile, i.e. kinetic energy
82 // plus rest energy (Mc^2) 84 // plus rest energy (Mc^2)
83 // betaSquared = beta of projectile squa 85 // betaSquared = beta of projectile squared, calculated as
84 // beta^2 = 1 - 1 / (E/ 86 // beta^2 = 1 - 1 / (E/Mc^2)^2
85 // = T * ( E + M 87 // = T * ( E + Mc^2 ) / E^2
86 // where T = kineticEnergy 88 // where T = kineticEnergy, E = totEnergy
87 // cutEnergy = energy threshold for se 89 // cutEnergy = energy threshold for secondary particle production
88 // i.e. energy cut, below 90 // i.e. energy cut, below which energy transfered to
89 // electrons is treated as 91 // electrons is treated as continuous loss of projectile
90 // maxKinEnergy = maximum energy transfer 92 // maxKinEnergy = maximum energy transferable to secondary electrons
91 // meanRate = mean kinetic energy of 93 // meanRate = mean kinetic energy of delta ray (per unit length)
92 // (above cutEnergy) 94 // (above cutEnergy)
93 95
94 G4double meanRate = 0.0; 96 G4double meanRate = 0.0;
95 97
96 G4double maxKinEnergy = MaxSecondaryEnergy(p 98 G4double maxKinEnergy = MaxSecondaryEnergy(particle, kineticEnergy);
97 99
98 if (cutEnergy < maxKinEnergy) { 100 if (cutEnergy < maxKinEnergy) {
99 101
100 G4double totalEnergy = kineticEnergy + ca 102 G4double totalEnergy = kineticEnergy + cacheMass;
101 G4double betaSquared = kineticEnergy * 103 G4double betaSquared = kineticEnergy *
102 (totalEnergy + cacheMass) / 104 (totalEnergy + cacheMass) / (totalEnergy * totalEnergy);
103 105
104 G4double cutMaxEnergyRatio = cutEnergy / m 106 G4double cutMaxEnergyRatio = cutEnergy / maxKinEnergy;
105 107
106 meanRate = 108 meanRate =
107 (- std::log(cutMaxEnergyRatio) - (1.0 109 (- std::log(cutMaxEnergyRatio) - (1.0 - cutMaxEnergyRatio) * betaSquared) *
108 CLHEP::twopi_mc2_rcl2 * << 110 twopi_mc2_rcl2 *
109 (material->GetTotNbOfElectPerVolume()) 111 (material->GetTotNbOfElectPerVolume()) / betaSquared;
110 112
111 meanRate *= GetChargeSquareRatio(particle, 113 meanRate *= GetChargeSquareRatio(particle, material, kineticEnergy);
112 } 114 }
113 115
114 return meanRate; 116 return meanRate;
115 } 117 }
116 118
117 inline 119 inline
118 void G4IonParametrisedLossModel::UpdateCache( 120 void G4IonParametrisedLossModel::UpdateCache(
119 const G4ParticleD 121 const G4ParticleDefinition* particle) {
120 122
121 cacheParticle = particle; 123 cacheParticle = particle;
122 cacheMass = particle -> GetPDGMass(); 124 cacheMass = particle -> GetPDGMass();
123 cacheElecMassRatio = CLHEP::electron_mass_c2 << 125 cacheElecMassRatio = electron_mass_c2 / cacheMass;
124 G4double q = particle -> GetPDGCharge() / CL << 126 G4double q = particle -> GetPDGCharge() / eplus;
125 cacheChargeSquare = q * q; 127 cacheChargeSquare = q * q;
126 } 128 }
127 129
128 inline 130 inline
129 LossTableList::iterator G4IonParametrisedLossM 131 LossTableList::iterator G4IonParametrisedLossModel::IsApplicable(
130 const G4ParticleDefinition 132 const G4ParticleDefinition* particle, // Projectile (ion)
131 const G4Material* material 133 const G4Material* material) { // Target material
132 134
133 LossTableList::iterator iter = lossTableList 135 LossTableList::iterator iter = lossTableList.end();
134 LossTableList::iterator iterTables = lossTab 136 LossTableList::iterator iterTables = lossTableList.begin();
135 LossTableList::iterator iterTables_end = los 137 LossTableList::iterator iterTables_end = lossTableList.end();
136 138
137 for(;iterTables != iterTables_end; iterTable 139 for(;iterTables != iterTables_end; iterTables++) {
138 G4bool isApplicable = (*iterTables) -> 140 G4bool isApplicable = (*iterTables) ->
139 IsApplicable(particle, 141 IsApplicable(particle, material);
140 if(isApplicable) { 142 if(isApplicable) {
141 iter = iterTables; 143 iter = iterTables;
142 break; 144 break;
143 } 145 }
144 } 146 }
145 147
146 return iter; 148 return iter;
147 } 149 }
148 150
149 151
150 inline 152 inline
151 void G4IonParametrisedLossModel::SetEnergyLoss 153 void G4IonParametrisedLossModel::SetEnergyLossLimit(
152 G4 154 G4double ionEnergyLossLimit) {
153 155
154 if(ionEnergyLossLimit > 0 && ionEnergyLossLi 156 if(ionEnergyLossLimit > 0 && ionEnergyLossLimit <=1) {
155 157
156 energyLossLimit = ionEnergyLossLimit; 158 energyLossLimit = ionEnergyLossLimit;
157 } 159 }
158 } 160 }
159 161