| Geant4 Cross Reference |
1 // 1
2 // *******************************************
3 // * License and Disclaimer
4 // *
5 // * The Geant4 software is copyright of th
6 // * the Geant4 Collaboration. It is provided
7 // * conditions of the Geant4 Software License
8 // * LICENSE and available at http://cern.ch/
9 // * include a list of copyright holders.
10 // *
11 // * Neither the authors of this software syst
12 // * institutes,nor the agencies providing fin
13 // * work make any representation or warran
14 // * regarding this software system or assum
15 // * use. Please see the license in the file
16 // * for the full disclaimer and the limitatio
17 // *
18 // * This code implementation is the result
19 // * technical work of the GEANT4 collaboratio
20 // * By using, copying, modifying or distri
21 // * any work based on the software) you ag
22 // * use in resulting scientific publicati
23 // * acceptance of all terms of the Geant4 Sof
24 // *******************************************
25 //
26 //
27 // ===========================================
28 // GEANT4 class
29 //
30 // Class: G4IonParametrisedLoss
31 //
32 // Base class: G4VEmModel (utils)
33 //
34 // Author: Anton Lechner (Anton.
35 //
36 // First implementation: 10. 11. 2008
37 //
38 // Modifications: 03. 02. 2009 - Bug fix itera
39 // 11. 03. 2009 - Introduced ne
40 // and modified
41 // (tables are n
42 // Minor bug fix
43 // 20. 11. 2009 - Added set-met
44 // 04. 11. 2010 - Moved virtual
45 //
46 // Class description:
47 // Model for computing the energy loss of i
48 // parameterisation of dE/dx tables (defaul
49 // ion-material combinations and/or project
50 // by this model, the G4BraggIonModel and G
51 // employed.
52 //
53 // Comments:
54 //
55 // ===========================================
56
57 inline G4double G4IonParametrisedLossModel::De
58 const G4
59 const G4ParticleDefinition
60 G4double kineticEnergy,
61 G4double cutEnergy) {
62
63 // ############## Mean energy transferred to
64 // Computes the mean energy transfered to de
65 // considering only delta-rays with energies
66 // (energy cut)
67 //
68 // The mean energy transfer rate is derived
69 // cross section given in the references bel
70 //
71 // See Geant4 physics reference manual (vers
72 //
73 // Ref.: W.M. Yao et al, Jour. of Phys. G 33
74 // B. Rossi, High energy particles, Ne
75 //
76 // (Implementation adapted from G4BraggIonMo
77
78
79 // *** Variables:
80 // kineticEnergy = kinetic energy of proje
81 // totEnergy = total energy of project
82 // plus rest energy (Mc^2)
83 // betaSquared = beta of projectile squa
84 // beta^2 = 1 - 1 / (E/
85 // = T * ( E + M
86 // where T = kineticEnergy
87 // cutEnergy = energy threshold for se
88 // i.e. energy cut, below
89 // electrons is treated as
90 // maxKinEnergy = maximum energy transfer
91 // meanRate = mean kinetic energy of
92 // (above cutEnergy)
93
94 G4double meanRate = 0.0;
95
96 G4double maxKinEnergy = MaxSecondaryEnergy(p
97
98 if (cutEnergy < maxKinEnergy) {
99
100 G4double totalEnergy = kineticEnergy + ca
101 G4double betaSquared = kineticEnergy *
102 (totalEnergy + cacheMass) /
103
104 G4double cutMaxEnergyRatio = cutEnergy / m
105
106 meanRate =
107 (- std::log(cutMaxEnergyRatio) - (1.0
108 CLHEP::twopi_mc2_rcl2 *
109 (material->GetTotNbOfElectPerVolume())
110
111 meanRate *= GetChargeSquareRatio(particle,
112 }
113
114 return meanRate;
115 }
116
117 inline
118 void G4IonParametrisedLossModel::UpdateCache(
119 const G4ParticleD
120
121 cacheParticle = particle;
122 cacheMass = particle -> GetPDGMass();
123 cacheElecMassRatio = CLHEP::electron_mass_c2
124 G4double q = particle -> GetPDGCharge() / CL
125 cacheChargeSquare = q * q;
126 }
127
128 inline
129 LossTableList::iterator G4IonParametrisedLossM
130 const G4ParticleDefinition
131 const G4Material* material
132
133 LossTableList::iterator iter = lossTableList
134 LossTableList::iterator iterTables = lossTab
135 LossTableList::iterator iterTables_end = los
136
137 for(;iterTables != iterTables_end; iterTable
138 G4bool isApplicable = (*iterTables) ->
139 IsApplicable(particle,
140 if(isApplicable) {
141 iter = iterTables;
142 break;
143 }
144 }
145
146 return iter;
147 }
148
149
150 inline
151 void G4IonParametrisedLossModel::SetEnergyLoss
152 G4
153
154 if(ionEnergyLossLimit > 0 && ionEnergyLossLi
155
156 energyLossLimit = ionEnergyLossLimit;
157 }
158 }
159