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25 // 25 //
>> 26 // $Id: G4TransitionRadiation.cc,v 1.10 2010-10-14 18:38:21 vnivanch Exp $
>> 27 // GEANT4 tag $Name: not supported by cvs2svn $
>> 28 //
26 // G4TransitionRadiation class -- implementati 29 // G4TransitionRadiation class -- implementation file
27 30
28 // GEANT 4 class implementation file --- Copyr 31 // GEANT 4 class implementation file --- Copyright CERN 1995
>> 32 // CERN Geneva Switzerland
29 33
30 // For information related to this code, pleas 34 // For information related to this code, please, contact
31 // CERN, CN Division, ASD Group 35 // CERN, CN Division, ASD Group
32 // History: 36 // History:
33 // 1st version 11.09.97 V. Grichine (Vladimir. 37 // 1st version 11.09.97 V. Grichine (Vladimir.Grichine@cern.ch )
34 // 2nd version 16.12.97 V. Grichine 38 // 2nd version 16.12.97 V. Grichine
35 // 3rd version 28.07.05, P.Gumplinger add G4Pr 39 // 3rd version 28.07.05, P.Gumplinger add G4ProcessType to constructor
36 40
37 //#include <cmath> <<
38 41
39 #include "G4TransitionRadiation.hh" << 42 #include <cmath>
40 43
>> 44 #include "G4TransitionRadiation.hh"
>> 45 #include "G4Material.hh"
41 #include "G4EmProcessSubType.hh" 46 #include "G4EmProcessSubType.hh"
42 47
>> 48 // Local constants
>> 49
>> 50 const G4int G4TransitionRadiation::fSympsonNumber = 100 ;
>> 51 const G4int G4TransitionRadiation::fGammaNumber = 15 ;
>> 52 const G4int G4TransitionRadiation::fPointNumber = 100 ;
>> 53
>> 54
43 ////////////////////////////////////////////// 55 ///////////////////////////////////////////////////////////////////////
>> 56 //
44 // Constructor for selected couple of material 57 // Constructor for selected couple of materials
45 G4TransitionRadiation::G4TransitionRadiation(c << 58 //
46 G << 59
>> 60 G4TransitionRadiation::
>> 61 G4TransitionRadiation( const G4String& processName, G4ProcessType type )
47 : G4VDiscreteProcess(processName, type) 62 : G4VDiscreteProcess(processName, type)
48 { 63 {
49 SetProcessSubType(fTransitionRadiation); 64 SetProcessSubType(fTransitionRadiation);
50 fMatIndex1 = fMatIndex2 = 0; 65 fMatIndex1 = fMatIndex2 = 0;
51 66
52 fGamma = fEnergy = fVarAngle = fMinEnergy = << 67 fGamma = fEnergy = fVarAngle = fMinEnergy = fMaxEnergy = fMaxTheta = fSigma1 = fSigma2 = 0.0;
53 fSigma1 = fSigma2 = 0.0; <<
54 } 68 }
55 69
56 ////////////////////////////////////////////// 70 //////////////////////////////////////////////////////////////////////
>> 71 //
57 // Destructor 72 // Destructor
58 G4TransitionRadiation::~G4TransitionRadiation( << 73 //
59 74
60 void G4TransitionRadiation::ProcessDescription << 75 G4TransitionRadiation::~G4TransitionRadiation()
61 { << 76 {}
62 out << "Base class for simulation of x-ray t <<
63 } <<
64 77
65 G4bool G4TransitionRadiation::IsApplicable( << 78 G4bool
66 const G4ParticleDefinition& aParticleType) << 79 G4TransitionRadiation::IsApplicable(const G4ParticleDefinition& aParticleType)
67 { 80 {
68 return (aParticleType.GetPDGCharge() != 0.0) << 81 return ( aParticleType.GetPDGCharge() != 0.0 );
69 } 82 }
70 83
71 G4double G4TransitionRadiation::GetMeanFreePat << 84 G4double G4TransitionRadiation::GetMeanFreePath(const G4Track&,
72 << 85 G4double,
>> 86 G4ForceCondition* condition)
73 { 87 {
74 *condition = Forced; 88 *condition = Forced;
75 return DBL_MAX; // so TR doesn't limit mean << 89 return DBL_MAX; // so TR doesn't limit mean free path
76 } 90 }
77 91
78 G4VParticleChange* G4TransitionRadiation::Post 92 G4VParticleChange* G4TransitionRadiation::PostStepDoIt(const G4Track&,
79 << 93 const G4Step&)
80 { 94 {
81 ClearNumberOfInteractionLengthLeft(); 95 ClearNumberOfInteractionLengthLeft();
82 return &aParticleChange; 96 return &aParticleChange;
83 } 97 }
84 98
85 ////////////////////////////////////////////// 99 ///////////////////////////////////////////////////////////////////
>> 100 //
86 // Sympson integral of TR spectral-angle densi 101 // Sympson integral of TR spectral-angle density over energy between
87 // the limits energy 1 and energy2 at fixed va 102 // the limits energy 1 and energy2 at fixed varAngle = 1 - std::cos(Theta)
88 G4double G4TransitionRadiation::IntegralOverEn << 103
89 << 104 G4double
90 << 105 G4TransitionRadiation::IntegralOverEnergy( G4double energy1,
91 { << 106 G4double energy2,
92 G4int i; << 107 G4double varAngle ) const
93 G4double h, sumEven = 0.0, sumOdd = 0.0; << 108 {
94 h = 0.5 * (energy2 - energy1) / fSympsonNumb << 109 G4int i ;
95 for(i = 1; i < fSympsonNumber; i++) << 110 G4double h , sumEven = 0.0 , sumOdd = 0.0 ;
>> 111 h = 0.5*(energy2 - energy1)/fSympsonNumber ;
>> 112 for(i=1;i<fSympsonNumber;i++)
96 { 113 {
97 sumEven += SpectralAngleTRdensity(energy1 << 114 sumEven += SpectralAngleTRdensity(energy1 + 2*i*h,varAngle) ;
98 sumOdd += SpectralAngleTRdensity(energy1 + << 115 sumOdd += SpectralAngleTRdensity(energy1 + (2*i - 1)*h,varAngle) ;
99 } 116 }
100 sumOdd += << 117 sumOdd += SpectralAngleTRdensity(energy1 + (2*fSympsonNumber - 1)*h,varAngle) ;
101 SpectralAngleTRdensity(energy1 + (2 * fSym << 118 return h*( SpectralAngleTRdensity(energy1,varAngle)
102 return h * << 119 + SpectralAngleTRdensity(energy2,varAngle)
103 (SpectralAngleTRdensity(energy1, varA << 120 + 4.0*sumOdd + 2.0*sumEven )/3.0 ;
104 SpectralAngleTRdensity(energy2, varA <<
105 2.0 * sumEven) / <<
106 3.0; <<
107 } 121 }
108 122
>> 123
>> 124
109 ////////////////////////////////////////////// 125 ///////////////////////////////////////////////////////////////////
>> 126 //
110 // Sympson integral of TR spectral-angle densi 127 // Sympson integral of TR spectral-angle density over energy between
111 // the limits varAngle1 and varAngle2 at fixed 128 // the limits varAngle1 and varAngle2 at fixed energy
112 G4double G4TransitionRadiation::IntegralOverAn << 129
113 << 130 G4double
114 << 131 G4TransitionRadiation::IntegralOverAngle( G4double energy,
115 { << 132 G4double varAngle1,
116 G4int i; << 133 G4double varAngle2 ) const
117 G4double h, sumEven = 0.0, sumOdd = 0.0; << 134 {
118 h = 0.5 * (varAngle2 - varAngle1) / fSympson << 135 G4int i ;
119 for(i = 1; i < fSympsonNumber; ++i) << 136 G4double h , sumEven = 0.0 , sumOdd = 0.0 ;
>> 137 h = 0.5*(varAngle2 - varAngle1)/fSympsonNumber ;
>> 138 for(i=1;i<fSympsonNumber;i++)
120 { 139 {
121 sumEven += SpectralAngleTRdensity(energy, << 140 sumEven += SpectralAngleTRdensity(energy,varAngle1 + 2*i*h) ;
122 sumOdd += SpectralAngleTRdensity(energy, v << 141 sumOdd += SpectralAngleTRdensity(energy,varAngle1 + (2*i - 1)*h) ;
123 } 142 }
124 sumOdd += << 143 sumOdd += SpectralAngleTRdensity(energy,varAngle1 + (2*fSympsonNumber - 1)*h) ;
125 SpectralAngleTRdensity(energy, varAngle1 + <<
126 144
127 return h * << 145 return h*( SpectralAngleTRdensity(energy,varAngle1)
128 (SpectralAngleTRdensity(energy, varAn << 146 + SpectralAngleTRdensity(energy,varAngle2)
129 SpectralAngleTRdensity(energy, varAn << 147 + 4.0*sumOdd + 2.0*sumEven )/3.0 ;
130 2.0 * sumEven) / <<
131 3.0; <<
132 } 148 }
133 149
134 ////////////////////////////////////////////// 150 ///////////////////////////////////////////////////////////////////
>> 151 //
135 // The number of transition radiation photons 152 // The number of transition radiation photons generated in the
136 // angle interval between varAngle1 and varAng 153 // angle interval between varAngle1 and varAngle2
137 G4double G4TransitionRadiation::AngleIntegralD << 154 //
138 G4double varAngle1, G4double varAngle2) cons << 155
139 { << 156 G4double G4TransitionRadiation::
140 G4int i; << 157 AngleIntegralDistribution( G4double varAngle1,
141 G4double h, sumEven = 0.0, sumOdd = 0.0; << 158 G4double varAngle2 ) const
142 h = 0.5 * (varAngle2 - varAngle1) / fSympson << 159 {
143 for(i = 1; i < fSympsonNumber; ++i) << 160 G4int i ;
>> 161 G4double h , sumEven = 0.0 , sumOdd = 0.0 ;
>> 162 h = 0.5*(varAngle2 - varAngle1)/fSympsonNumber ;
>> 163 for(i=1;i<fSympsonNumber;i++)
144 { 164 {
145 sumEven += IntegralOverEnergy(fMinEnergy, << 165 sumEven += IntegralOverEnergy(fMinEnergy,
146 fMinEnergy + << 166 fMinEnergy +0.3*(fMaxEnergy-fMinEnergy),
147 varAngle1 + << 167 varAngle1 + 2*i*h)
148 IntegralOverEnergy(fMinEnergy + << 168 + IntegralOverEnergy(fMinEnergy + 0.3*(fMaxEnergy - fMinEnergy),
149 fMaxEnergy, << 169 fMaxEnergy,
150 sumOdd += IntegralOverEnergy(fMinEnergy, << 170 varAngle1 + 2*i*h);
151 fMinEnergy + << 171 sumOdd += IntegralOverEnergy(fMinEnergy,
152 varAngle1 + ( << 172 fMinEnergy + 0.3*(fMaxEnergy - fMinEnergy),
153 IntegralOverEnergy(fMinEnergy + << 173 varAngle1 + (2*i - 1)*h)
154 fMaxEnergy, v << 174 + IntegralOverEnergy(fMinEnergy + 0.3*(fMaxEnergy - fMinEnergy),
>> 175 fMaxEnergy,
>> 176 varAngle1 + (2*i - 1)*h) ;
155 } 177 }
156 sumOdd += << 178 sumOdd += IntegralOverEnergy(fMinEnergy,
157 IntegralOverEnergy(fMinEnergy, fMinEnergy << 179 fMinEnergy + 0.3*(fMaxEnergy - fMinEnergy),
158 varAngle1 + (2 * fSymps << 180 varAngle1 + (2*fSympsonNumber - 1)*h)
159 IntegralOverEnergy(fMinEnergy + 0.3 * (fMa << 181 + IntegralOverEnergy(fMinEnergy + 0.3*(fMaxEnergy - fMinEnergy),
160 varAngle1 + (2 * fSymps << 182 fMaxEnergy,
161 << 183 varAngle1 + (2*fSympsonNumber - 1)*h) ;
162 return h * << 184
163 (IntegralOverEnergy(fMinEnergy, << 185 return h*(IntegralOverEnergy(fMinEnergy,
164 fMinEnergy + 0.3 << 186 fMinEnergy + 0.3*(fMaxEnergy - fMinEnergy),
165 varAngle1) + << 187 varAngle1)
166 IntegralOverEnergy(fMinEnergy + 0.3 << 188 + IntegralOverEnergy(fMinEnergy + 0.3*(fMaxEnergy - fMinEnergy),
167 fMaxEnergy, varAn << 189 fMaxEnergy,
168 IntegralOverEnergy(fMinEnergy, << 190 varAngle1)
169 fMinEnergy + 0.3 << 191 + IntegralOverEnergy(fMinEnergy,
170 varAngle2) + << 192 fMinEnergy + 0.3*(fMaxEnergy - fMinEnergy),
171 IntegralOverEnergy(fMinEnergy + 0.3 << 193 varAngle2)
172 fMaxEnergy, varAn << 194 + IntegralOverEnergy(fMinEnergy + 0.3*(fMaxEnergy - fMinEnergy),
173 4.0 * sumOdd + 2.0 * sumEven) / << 195 fMaxEnergy,
174 3.0; << 196 varAngle2)
>> 197 + 4.0*sumOdd + 2.0*sumEven )/3.0 ;
175 } 198 }
176 199
177 ////////////////////////////////////////////// 200 ///////////////////////////////////////////////////////////////////
>> 201 //
178 // The number of transition radiation photons, 202 // The number of transition radiation photons, generated in the
179 // energy interval between energy1 and energy2 203 // energy interval between energy1 and energy2
180 G4double G4TransitionRadiation::EnergyIntegral << 204 //
181 G4double energy1, G4double energy2) const << 205
182 { << 206 G4double G4TransitionRadiation::
183 G4int i; << 207 EnergyIntegralDistribution( G4double energy1,
184 G4double h, sumEven = 0.0, sumOdd = 0.0; << 208 G4double energy2 ) const
185 h = 0.5 * (energy2 - energy1) / fSympsonNumb << 209 {
186 for(i = 1; i < fSympsonNumber; ++i) << 210 G4int i ;
>> 211 G4double h , sumEven = 0.0 , sumOdd = 0.0 ;
>> 212 h = 0.5*(energy2 - energy1)/fSympsonNumber ;
>> 213 for(i=1;i<fSympsonNumber;i++)
187 { 214 {
188 sumEven += << 215 sumEven += IntegralOverAngle(energy1 + 2*i*h,0.0,0.01*fMaxTheta )
189 IntegralOverAngle(energy1 + 2 * i * h, 0 << 216 + IntegralOverAngle(energy1 + 2*i*h,0.01*fMaxTheta,fMaxTheta);
190 IntegralOverAngle(energy1 + 2 * i * h, 0 << 217 sumOdd += IntegralOverAngle(energy1 + (2*i - 1)*h,0.0,0.01*fMaxTheta)
191 sumOdd += << 218 + IntegralOverAngle(energy1 + (2*i - 1)*h,0.01*fMaxTheta,fMaxTheta) ;
192 IntegralOverAngle(energy1 + (2 * i - 1) <<
193 IntegralOverAngle(energy1 + (2 * i - 1) <<
194 } 219 }
195 sumOdd += IntegralOverAngle(energy1 + (2 * f << 220 sumOdd += IntegralOverAngle(energy1 + (2*fSympsonNumber - 1)*h,
196 0.01 * fMaxTheta << 221 0.0,0.01*fMaxTheta)
197 IntegralOverAngle(energy1 + (2 * f << 222 + IntegralOverAngle(energy1 + (2*fSympsonNumber - 1)*h,
198 0.01 * fMaxTheta << 223 0.01*fMaxTheta,fMaxTheta) ;
199 << 224
200 return h * << 225 return h*(IntegralOverAngle(energy1,0.0,0.01*fMaxTheta)
201 (IntegralOverAngle(energy1, 0.0, 0.01 << 226 + IntegralOverAngle(energy1,0.01*fMaxTheta,fMaxTheta)
202 IntegralOverAngle(energy1, 0.01 * fM << 227 + IntegralOverAngle(energy2,0.0,0.01*fMaxTheta)
203 IntegralOverAngle(energy2, 0.0, 0.01 << 228 + IntegralOverAngle(energy2,0.01*fMaxTheta,fMaxTheta)
204 IntegralOverAngle(energy2, 0.01 * fM << 229 + 4.0*sumOdd + 2.0*sumEven )/3.0 ;
205 4.0 * sumOdd + 2.0 * sumEven) / <<
206 3.0; <<
207 } 230 }
>> 231
>> 232
>> 233
>> 234
>> 235 // end of G4TransitionRadiation implementation file --------------------------
208 236