source: trunk/source/processes/electromagnetic/standard/src/G4ionGasIonisation.cc@ 952

Last change on this file since 952 was 819, checked in by garnier, 17 years ago

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18// * This code implementation is the result of the scientific and *
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25//
26// $Id: G4ionGasIonisation.cc,v 1.4 2008/01/14 11:59:45 vnivanch Exp $
27// GEANT4 tag $Name: geant4-09-01-patch-02 $
28//
29// -------------------------------------------------------------------
30//
31// GEANT4 Class file
32//
33//
34// File name: G4ionGasIonisation
35//
36// Author: Vladimir Ivanchenko
37//
38// Creation date: 23.07.2007
39//
40// Modifications:
41//
42//
43// -------------------------------------------------------------------
44//
45//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
46//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
47
48#include "G4ionGasIonisation.hh"
49#include "G4Electron.hh"
50#include "G4Proton.hh"
51#include "G4GenericIon.hh"
52
53//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
54
55using namespace std;
56
57G4ionGasIonisation::G4ionGasIonisation(const G4String& name)
58 : G4ionIonisation(name),
59 currParticle(0),
60 baseParticle(0),
61 initialised(false)
62{
63 atomXS = CLHEP::pi*CLHEP::Bohr_radius*CLHEP::Bohr_radius;
64 verboseLevel = 1;
65}
66
67//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
68
69G4ionGasIonisation::~G4ionGasIonisation()
70{}
71
72//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
73
74void G4ionGasIonisation::InitialiseEnergyLossProcess(
75 const G4ParticleDefinition* part,
76 const G4ParticleDefinition* bpart)
77{
78 G4ionIonisation::InitialiseEnergyLossProcess(part, bpart);
79 if(initialised) return;
80
81 currParticle = part;
82
83 if(part == bpart || part == G4GenericIon::GenericIon()) baseParticle = 0;
84 else if(bpart == 0) baseParticle = G4GenericIon::GenericIon();
85 else baseParticle = bpart;
86
87 if(baseParticle) basePartMass = baseParticle->GetPDGMass();
88 else basePartMass = currParticle->GetPDGMass();
89
90 initialised = true;
91}
92
93//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
94
95void G4ionGasIonisation::PrintInfo()
96{
97 G4ionIonisation::PrintInfo();
98 G4cout << " Version of ion process with simulation discrete ion/media change exchange."
99 << G4endl;
100}
101
102//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
103
104void G4ionGasIonisation::InitialiseMassCharge(const G4Track& track)
105{
106 // First step of an ion
107 if(track.GetCurrentStepNumber() == 1) {
108 currParticle = track.GetDefinition();
109 ionZ = G4int(currParticle->GetPDGCharge()/eplus + 0.5);
110 currentIonZ = G4int(track.GetDynamicParticle()->GetCharge()/eplus + 0.5);
111 currMassRatio = basePartMass/currParticle->GetPDGMass();
112 }
113 // any step
114 G4double q = eplus*currentIonZ;
115 SetDynamicMassCharge(currMassRatio, q*q);
116 preStepKinEnergy = track.GetKineticEnergy();
117}
118
119//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
120
121void G4ionGasIonisation::CorrectionsAlongStep(const G4MaterialCutsCouple* couple,
122 const G4DynamicParticle* dp,
123 G4double& eloss,
124 G4double& s)
125{
126 const G4ParticleDefinition* part = dp->GetDefinition();
127 const G4Material* mat = couple->GetMaterial();
128 // add corrections
129 if(eloss < preStepKinEnergy) {
130
131 // use Bethe-Bloch with corrections
132 if(preStepKinEnergy*currMassRatio > BetheBlochEnergyThreshold())
133 eloss += s*corr->HighOrderCorrections(part,mat,preStepKinEnergy);
134
135 // effective number of collisions
136 G4double x = mat->GetElectronDensity()*s*atomXS;
137 // equilibrium charge
138 G4double q = fParticleChange.GetProposedCharge();
139
140 // sample charge change during the step
141 fParticleChange.SetProposedCharge(SampleChargeAfterStep(q, x));
142 }
143
144 // use nuclear stopping
145 if(NuclearStoppingFlag()) {
146 G4double nloss = s*corr->NuclearDEDX(part,mat,preStepKinEnergy - eloss*0.5);
147 eloss += nloss;
148 fParticleChange.ProposeNonIonizingEnergyDeposit(nloss);
149 }
150}
151
152//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
153
154G4double G4ionGasIonisation::SampleChargeAfterStep(G4double qeff, G4double xeff)
155{
156 // qeff - equilibrium charge
157 // xeff - effective number of collisions
158 // q - current charge
159 G4double q = eplus*currentIonZ;
160 if(verboseLevel > 1) G4cout << "G4ionGasIonisation: Q1= " << currentIonZ
161 << " Qeff= " << qeff/eplus << " Neff= " << xeff
162 << G4endl;
163 return q;
164}
165
166//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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