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26 // 26 //
27 // ------------------------------------------- 27 // -----------------------------------------------------------------------------
28 // 28 //
29 // GEANT4 Class implementation file 29 // GEANT4 Class implementation file
30 // 30 //
31 // File name: G4GoudsmitSaundersonTable 31 // File name: G4GoudsmitSaundersonTable
32 // 32 //
33 // Author: Mihaly Novak / (Omrane Kadri 33 // Author: Mihaly Novak / (Omrane Kadri)
34 // 34 //
35 // Creation date: 20.02.2009 35 // Creation date: 20.02.2009
36 // 36 //
37 // Class description: 37 // Class description:
38 // Class to handle multiple scattering angul 38 // Class to handle multiple scattering angular distributions precomputed by
39 // using Kawrakow-Bielajew Goudsmit-Saunders 39 // using Kawrakow-Bielajew Goudsmit-Saunderson MSC model based on the screened
40 // Rutherford DCS for elastic scattering of 40 // Rutherford DCS for elastic scattering of electrons/positrons [1,2]. This
41 // class is used by G4GoudsmitSaundersonMscM 41 // class is used by G4GoudsmitSaundersonMscModel to sample the angular
42 // deflection of electrons/positrons after t 42 // deflection of electrons/positrons after travelling a given path.
43 // 43 //
44 // Modifications: 44 // Modifications:
45 // 04.03.2009 V.Ivanchenko cleanup and format 45 // 04.03.2009 V.Ivanchenko cleanup and format according to Geant4 EM style
46 // 26.08.2009 O.Kadri: avoiding unuseful calcu 46 // 26.08.2009 O.Kadri: avoiding unuseful calculations and optimizing the root
47 // finding parameter error 47 // finding parameter error's within SampleTheta method
48 // 08.02.2010 O.Kadri: reduce delared variable 48 // 08.02.2010 O.Kadri: reduce delared variables; reduce error of finding root
49 // in secant method 49 // in secant method
50 // 26.03.2010 O.Kadri: minimum of used arrays 50 // 26.03.2010 O.Kadri: minimum of used arrays in computation within the dichotomie
51 // finding method the erro 51 // finding method the error was the lowest value of uvalues
52 // 12.05.2010 O.Kadri: changing of sqrt((b-a)* 52 // 12.05.2010 O.Kadri: changing of sqrt((b-a)*(b-a)) with fabs(b-a)
53 // 18.05.2015 M. Novak This class has been com 53 // 18.05.2015 M. Novak This class has been completely replaced (only the original
54 // class name was kept; class descr 54 // class name was kept; class description was also inserted):
55 // A new version of Kawrakow-Bielaj 55 // A new version of Kawrakow-Bielajew Goudsmit-Saunderson MSC model
56 // based on the screened Rutherford 56 // based on the screened Rutherford DCS for elastic scattering of
57 // electrons/positrons has been int 57 // electrons/positrons has been introduced[1,2]. The corresponding MSC
58 // angular distributions over a 2D 58 // angular distributions over a 2D parameter grid have been recomputed
59 // and the CDFs are now stored in a 59 // and the CDFs are now stored in a variable transformed (smooth) form
60 // together with the corresponding 60 // together with the corresponding rational interpolation parameters.
61 // The new version is several times 61 // The new version is several times faster, more robust and accurate
62 // compared to the earlier version 62 // compared to the earlier version (G4GoudsmitSaundersonMscModel class
63 // that use these data has been als 63 // that use these data has been also completely replaced)
64 // 28.04.2017 M. Novak: New representation of 64 // 28.04.2017 M. Novak: New representation of the angular distribution data with
65 // significantly reduced data size. 65 // significantly reduced data size.
66 // 23.08.2017 M. Novak: Added funtionality to 66 // 23.08.2017 M. Novak: Added funtionality to handle Mott-correction to the
67 // base GS angular distributions an 67 // base GS angular distributions and some other factors (screening
68 // parameter, first and second mome 68 // parameter, first and second moments) when Mott-correction is
69 // activated in the GS-MSC model. 69 // activated in the GS-MSC model.
70 // 70 //
71 // References: 71 // References:
72 // [1] A.F.Bielajew, NIMB, 111 (1996) 195-20 72 // [1] A.F.Bielajew, NIMB, 111 (1996) 195-208
73 // [2] I.Kawrakow, A.F.Bielajew, NIMB 134(19 73 // [2] I.Kawrakow, A.F.Bielajew, NIMB 134(1998) 325-336
74 // 74 //
75 // ------------------------------------------- 75 // -----------------------------------------------------------------------------
76 76
77 #include "G4GoudsmitSaundersonTable.hh" 77 #include "G4GoudsmitSaundersonTable.hh"
78 78
79 79
80 #include "G4PhysicalConstants.hh" 80 #include "G4PhysicalConstants.hh"
81 #include "Randomize.hh" 81 #include "Randomize.hh"
82 #include "G4Log.hh" 82 #include "G4Log.hh"
83 #include "G4Exp.hh" 83 #include "G4Exp.hh"
84 84
85 #include "G4GSMottCorrection.hh" 85 #include "G4GSMottCorrection.hh"
86 #include "G4MaterialTable.hh" 86 #include "G4MaterialTable.hh"
87 #include "G4Material.hh" 87 #include "G4Material.hh"
88 #include "G4MaterialCutsCouple.hh" 88 #include "G4MaterialCutsCouple.hh"
89 #include "G4ProductionCutsTable.hh" 89 #include "G4ProductionCutsTable.hh"
90 #include "G4EmParameters.hh" <<
91 90
92 #include "G4String.hh" 91 #include "G4String.hh"
93 92
94 #include <fstream> 93 #include <fstream>
95 #include <cstdlib> 94 #include <cstdlib>
96 #include <cmath> 95 #include <cmath>
97 96
98 #include <iostream> 97 #include <iostream>
99 #include <iomanip> 98 #include <iomanip>
100 99
101 // perecomputed GS angular distributions, base 100 // perecomputed GS angular distributions, based on the Screened-Rutherford DCS
102 // are the same for e- and e+ so make sure we 101 // are the same for e- and e+ so make sure we load them only onece
103 G4bool G4GoudsmitSaundersonTable::gIsInitialis 102 G4bool G4GoudsmitSaundersonTable::gIsInitialised = false;
104 // 103 //
105 std::vector<G4GoudsmitSaundersonTable::GSMSCAn 104 std::vector<G4GoudsmitSaundersonTable::GSMSCAngularDtr*> G4GoudsmitSaundersonTable::gGSMSCAngularDistributions1;
106 std::vector<G4GoudsmitSaundersonTable::GSMSCAn 105 std::vector<G4GoudsmitSaundersonTable::GSMSCAngularDtr*> G4GoudsmitSaundersonTable::gGSMSCAngularDistributions2;
107 // 106 //
108 std::vector<double> G4GoudsmitSaundersonTable: 107 std::vector<double> G4GoudsmitSaundersonTable::gMoliereBc;
109 std::vector<double> G4GoudsmitSaundersonTable: 108 std::vector<double> G4GoudsmitSaundersonTable::gMoliereXc2;
110 109
111 110
112 G4GoudsmitSaundersonTable::G4GoudsmitSaunderso 111 G4GoudsmitSaundersonTable::G4GoudsmitSaundersonTable(G4bool iselectron) {
113 fIsElectron = iselectron; 112 fIsElectron = iselectron;
114 // set initial values: final values will be 113 // set initial values: final values will be set in the Initialize method
115 fLogLambda0 = 0.; // wi 114 fLogLambda0 = 0.; // will be set properly at init.
116 fLogDeltaLambda = 0.; // wi 115 fLogDeltaLambda = 0.; // will be set properly at init.
117 fInvLogDeltaLambda = 0.; // wi 116 fInvLogDeltaLambda = 0.; // will be set properly at init.
118 fInvDeltaQ1 = 0.; // wi 117 fInvDeltaQ1 = 0.; // will be set properly at init.
119 fDeltaQ2 = 0.; // wi 118 fDeltaQ2 = 0.; // will be set properly at init.
120 fInvDeltaQ2 = 0.; // wi 119 fInvDeltaQ2 = 0.; // will be set properly at init.
121 // 120 //
122 fLowEnergyLimit = 0.1*CLHEP::keV; // w 121 fLowEnergyLimit = 0.1*CLHEP::keV; // will be set properly at init.
123 fHighEnergyLimit = 100.0*CLHEP::MeV; // w 122 fHighEnergyLimit = 100.0*CLHEP::MeV; // will be set properly at init.
124 // 123 //
125 fIsMottCorrection = false; // w 124 fIsMottCorrection = false; // will be set properly at init.
126 fIsPWACorrection = false; // w 125 fIsPWACorrection = false; // will be set properly at init.
127 fMottCorrection = nullptr; 126 fMottCorrection = nullptr;
128 // 127 //
129 fNumSPCEbinPerDec = 3; 128 fNumSPCEbinPerDec = 3;
130 } 129 }
131 130
132 G4GoudsmitSaundersonTable::~G4GoudsmitSaunders 131 G4GoudsmitSaundersonTable::~G4GoudsmitSaundersonTable() {
133 for (std::size_t i=0; i<gGSMSCAngularDistrib 132 for (std::size_t i=0; i<gGSMSCAngularDistributions1.size(); ++i) {
134 if (gGSMSCAngularDistributions1[i]) { 133 if (gGSMSCAngularDistributions1[i]) {
135 delete [] gGSMSCAngularDistributions1[i] 134 delete [] gGSMSCAngularDistributions1[i]->fUValues;
136 delete [] gGSMSCAngularDistributions1[i] 135 delete [] gGSMSCAngularDistributions1[i]->fParamA;
137 delete [] gGSMSCAngularDistributions1[i] 136 delete [] gGSMSCAngularDistributions1[i]->fParamB;
138 delete gGSMSCAngularDistributions1[i]; 137 delete gGSMSCAngularDistributions1[i];
139 } 138 }
140 } 139 }
141 gGSMSCAngularDistributions1.clear(); 140 gGSMSCAngularDistributions1.clear();
142 for (std::size_t i=0; i<gGSMSCAngularDistrib 141 for (std::size_t i=0; i<gGSMSCAngularDistributions2.size(); ++i) {
143 if (gGSMSCAngularDistributions2[i]) { 142 if (gGSMSCAngularDistributions2[i]) {
144 delete [] gGSMSCAngularDistributions2[i] 143 delete [] gGSMSCAngularDistributions2[i]->fUValues;
145 delete [] gGSMSCAngularDistributions2[i] 144 delete [] gGSMSCAngularDistributions2[i]->fParamA;
146 delete [] gGSMSCAngularDistributions2[i] 145 delete [] gGSMSCAngularDistributions2[i]->fParamB;
147 delete gGSMSCAngularDistributions2[i]; 146 delete gGSMSCAngularDistributions2[i];
148 } 147 }
149 } 148 }
150 gGSMSCAngularDistributions2.clear(); 149 gGSMSCAngularDistributions2.clear();
151 if (fMottCorrection) { 150 if (fMottCorrection) {
152 delete fMottCorrection; 151 delete fMottCorrection;
153 fMottCorrection = nullptr; 152 fMottCorrection = nullptr;
154 } 153 }
155 // clear scp correction data 154 // clear scp correction data
156 for (std::size_t imc=0; imc<fSCPCPerMatCuts. 155 for (std::size_t imc=0; imc<fSCPCPerMatCuts.size(); ++imc) {
157 if (fSCPCPerMatCuts[imc]) { 156 if (fSCPCPerMatCuts[imc]) {
158 fSCPCPerMatCuts[imc]->fVSCPC.clear(); 157 fSCPCPerMatCuts[imc]->fVSCPC.clear();
159 delete fSCPCPerMatCuts[imc]; 158 delete fSCPCPerMatCuts[imc];
160 } 159 }
161 } 160 }
162 fSCPCPerMatCuts.clear(); 161 fSCPCPerMatCuts.clear();
163 // 162 //
164 gIsInitialised = false; 163 gIsInitialised = false;
165 } 164 }
166 165
167 void G4GoudsmitSaundersonTable::Initialise(G4d 166 void G4GoudsmitSaundersonTable::Initialise(G4double lownergylimit, G4double highenergylimit) {
168 fLowEnergyLimit = lownergylimit; 167 fLowEnergyLimit = lownergylimit;
169 fHighEnergyLimit = highenergylimit; 168 fHighEnergyLimit = highenergylimit;
170 G4double lLambdaMin = G4Log(gLAMBMIN); 169 G4double lLambdaMin = G4Log(gLAMBMIN);
171 G4double lLambdaMax = G4Log(gLAMBMAX); 170 G4double lLambdaMax = G4Log(gLAMBMAX);
172 fLogLambda0 = lLambdaMin; 171 fLogLambda0 = lLambdaMin;
173 fLogDeltaLambda = (lLambdaMax-lLambdaMin 172 fLogDeltaLambda = (lLambdaMax-lLambdaMin)/(gLAMBNUM-1.);
174 fInvLogDeltaLambda = 1./fLogDeltaLambda; 173 fInvLogDeltaLambda = 1./fLogDeltaLambda;
175 fInvDeltaQ1 = 1./((gQMAX1-gQMIN1)/(g 174 fInvDeltaQ1 = 1./((gQMAX1-gQMIN1)/(gQNUM1-1.));
176 fDeltaQ2 = (gQMAX2-gQMIN2)/(gQNUM 175 fDeltaQ2 = (gQMAX2-gQMIN2)/(gQNUM2-1.);
177 fInvDeltaQ2 = 1./fDeltaQ2; 176 fInvDeltaQ2 = 1./fDeltaQ2;
178 // load precomputed angular distributions an 177 // load precomputed angular distributions and set up several values used during the sampling
179 // these are particle independet => they go 178 // these are particle independet => they go to static container: load them only onece
180 if (!gIsInitialised) { 179 if (!gIsInitialised) {
181 // load pre-computed GS angular distributi 180 // load pre-computed GS angular distributions (computed based on Screened-Rutherford DCS)
182 LoadMSCData(); 181 LoadMSCData();
183 gIsInitialised = true; 182 gIsInitialised = true;
184 } 183 }
185 InitMoliereMSCParams(); 184 InitMoliereMSCParams();
186 // Mott-correction: particle(e- or e+) depen 185 // Mott-correction: particle(e- or e+) dependet so init them
187 if (fIsMottCorrection) { 186 if (fIsMottCorrection) {
188 if (!fMottCorrection) { 187 if (!fMottCorrection) {
189 fMottCorrection = new G4GSMottCorrection 188 fMottCorrection = new G4GSMottCorrection(fIsElectron);
190 } 189 }
191 fMottCorrection->Initialise(); 190 fMottCorrection->Initialise();
192 } 191 }
193 // init scattering power correction data; us 192 // init scattering power correction data; used only together with Mott-correction
194 // (Moliere's parameters must be initialised 193 // (Moliere's parameters must be initialised before)
195 if (fMottCorrection) { 194 if (fMottCorrection) {
196 InitSCPCorrection(); 195 InitSCPCorrection();
197 } 196 }
198 } 197 }
199 198
200 199
201 // samplig multiple scattering angles cos(thet 200 // samplig multiple scattering angles cos(theta) and sin(thata)
202 // - including no-scattering, single, "few" s 201 // - including no-scattering, single, "few" scattering cases as well
203 // - Mott-correction will be included if it w 202 // - Mott-correction will be included if it was requested by the user (i.e. if fIsMottCorrection=true)
204 // lambdaval : s/lambda_el 203 // lambdaval : s/lambda_el
205 // qval : s/lambda_el G1 204 // qval : s/lambda_el G1
206 // scra : screening parameter 205 // scra : screening parameter
207 // cost : will be the smapled cos(theta) 206 // cost : will be the smapled cos(theta)
208 // sint : will be the smapled sin(theta) 207 // sint : will be the smapled sin(theta)
209 // lekin : logarithm of the current kineti 208 // lekin : logarithm of the current kinetic energy
210 // beta2 : the corresponding beta square 209 // beta2 : the corresponding beta square
211 // matindx : index of the current material 210 // matindx : index of the current material
212 // returns true if it was msc 211 // returns true if it was msc
213 G4bool G4GoudsmitSaundersonTable::Sampling(G4d 212 G4bool G4GoudsmitSaundersonTable::Sampling(G4double lambdaval, G4double qval, G4double scra, G4double &cost,
214 G4d 213 G4double &sint, G4double lekin, G4double beta2, G4int matindx,
215 GSM 214 GSMSCAngularDtr **gsDtr, G4int &mcekini, G4int &mcdelti,
216 G4d 215 G4double &transfPar, G4bool isfirst) {
217 G4double rand0 = G4UniformRand(); 216 G4double rand0 = G4UniformRand();
218 G4double expn = G4Exp(-lambdaval); 217 G4double expn = G4Exp(-lambdaval);
219 // 218 //
220 // no scattering case 219 // no scattering case
221 if (rand0<expn) { 220 if (rand0<expn) {
222 cost = 1.0; 221 cost = 1.0;
223 sint = 0.0; 222 sint = 0.0;
224 return false; 223 return false;
225 } 224 }
226 // 225 //
227 // single scattering case : sample from the 226 // single scattering case : sample from the single scattering PDF
228 // - Mott-correction will be included if it 227 // - Mott-correction will be included if it was requested by the user (i.e. if fIsMottCorrection=true)
229 if (rand0<(1.+lambdaval)*expn) { 228 if (rand0<(1.+lambdaval)*expn) {
230 // cost is sampled in SingleScattering() 229 // cost is sampled in SingleScattering()
231 cost = SingleScattering(lambdaval, scra, l 230 cost = SingleScattering(lambdaval, scra, lekin, beta2, matindx);
232 // add protections 231 // add protections
233 if (cost<-1.0) cost = -1.0; 232 if (cost<-1.0) cost = -1.0;
234 if (cost>1.0) cost = 1.0; 233 if (cost>1.0) cost = 1.0;
235 // compute sin(theta) from the sampled cos 234 // compute sin(theta) from the sampled cos(theta)
236 G4double dum0 = 1.-cost; 235 G4double dum0 = 1.-cost;
237 sint = std::sqrt(dum0*(2.0-dum0)); 236 sint = std::sqrt(dum0*(2.0-dum0));
238 return false; 237 return false;
239 } 238 }
240 // 239 //
241 // handle this case: 240 // handle this case:
242 // -lambdaval < 1 i.e. mean #elastic ev 241 // -lambdaval < 1 i.e. mean #elastic events along the step is < 1 but
243 // the currently sampled case is not 0 242 // the currently sampled case is not 0 or 1 scattering. [Our minimal
244 // lambdaval (that we have precomputed 243 // lambdaval (that we have precomputed, transformed angular distributions
245 // stored in a form of equally probabe 244 // stored in a form of equally probabe intervalls together with rational
246 // interp. parameters) is 1.] 245 // interp. parameters) is 1.]
247 // -probability of having n elastic eve 246 // -probability of having n elastic events follows Poisson stat. with
248 // lambdaval parameter. 247 // lambdaval parameter.
249 // -the max. probability (when lambdava 248 // -the max. probability (when lambdaval=1) of having more than one
250 // elastic events is 0.2642411 and the 249 // elastic events is 0.2642411 and the prob of having 2,3,..,n elastic
251 // events decays rapidly with n. So se 250 // events decays rapidly with n. So set a max n to 10.
252 // -sampling of this cases is done in a 251 // -sampling of this cases is done in a one-by-one single elastic event way
253 // where the current #elastic event is 252 // where the current #elastic event is sampled from the Poisson distr.
254 if (lambdaval<1.0) { 253 if (lambdaval<1.0) {
255 G4double prob, cumprob; 254 G4double prob, cumprob;
256 prob = cumprob = expn; 255 prob = cumprob = expn;
257 G4double curcost,cursint; 256 G4double curcost,cursint;
258 // init cos(theta) and sin(theta) to the z 257 // init cos(theta) and sin(theta) to the zero scattering values
259 cost = 1.0; 258 cost = 1.0;
260 sint = 0.0; 259 sint = 0.0;
261 for (G4int iel=1; iel<10; ++iel) { 260 for (G4int iel=1; iel<10; ++iel) {
262 // prob of having iel scattering from Po 261 // prob of having iel scattering from Poisson
263 prob *= lambdaval/(G4double)iel; 262 prob *= lambdaval/(G4double)iel;
264 cumprob += prob; 263 cumprob += prob;
265 // 264 //
266 //sample cos(theta) from the singe scatt 265 //sample cos(theta) from the singe scattering pdf:
267 // - Mott-correction will be included if 266 // - Mott-correction will be included if it was requested by the user (i.e. if fIsMottCorrection=true)
268 curcost = SingleScattering(lambdav 267 curcost = SingleScattering(lambdaval, scra, lekin, beta2, matindx);
269 G4double dum0 = 1.-curcost; 268 G4double dum0 = 1.-curcost;
270 cursint = dum0*(2.0-dum0); // sin^ 269 cursint = dum0*(2.0-dum0); // sin^2(theta)
271 // 270 //
272 // if we got current deflection that is 271 // if we got current deflection that is not too small
273 // then update cos(theta) sin(theta) 272 // then update cos(theta) sin(theta)
274 if (cursint>1.0e-20) { 273 if (cursint>1.0e-20) {
275 cursint = std::sqrt(cursint); 274 cursint = std::sqrt(cursint);
276 G4double curphi = CLHEP::twopi*G4Unifo 275 G4double curphi = CLHEP::twopi*G4UniformRand();
277 cost = cost*curcost-sint*cu 276 cost = cost*curcost-sint*cursint*std::cos(curphi);
278 sint = std::sqrt(std::max(0 277 sint = std::sqrt(std::max(0.0, (1.0-cost)*(1.0+cost)));
279 } 278 }
280 // 279 //
281 // check if we have done enough scatteri 280 // check if we have done enough scattering i.e. sampling from the Poisson
282 if (rand0<cumprob) { 281 if (rand0<cumprob) {
283 return false; 282 return false;
284 } 283 }
285 } 284 }
286 // if reached the max iter i.e. 10 285 // if reached the max iter i.e. 10
287 return false; 286 return false;
288 } 287 }
289 // 288 //
290 // multiple scattering case with lambdavalue 289 // multiple scattering case with lambdavalue >= 1:
291 // - use the precomputed and transformed G 290 // - use the precomputed and transformed Goudsmit-Saunderson angular
292 // distributions to sample cos(theta) 291 // distributions to sample cos(theta)
293 // - Mott-correction will be included if i 292 // - Mott-correction will be included if it was requested by the user (i.e. if fIsMottCorrection=true)
294 cost = SampleCosTheta(lambdaval, qval, scra, 293 cost = SampleCosTheta(lambdaval, qval, scra, lekin, beta2, matindx, gsDtr, mcekini, mcdelti, transfPar, isfirst);
295 // add protections 294 // add protections
296 if (cost<-1.0) cost = -1.0; 295 if (cost<-1.0) cost = -1.0;
297 if (cost> 1.0) cost = 1.0; 296 if (cost> 1.0) cost = 1.0;
298 // compute cos(theta) and sin(theta) from th 297 // compute cos(theta) and sin(theta) from the sampled 1-cos(theta)
299 G4double dum0 = 1.0-cost; 298 G4double dum0 = 1.0-cost;
300 sint = std::sqrt(dum0*(2.0-dum0)); 299 sint = std::sqrt(dum0*(2.0-dum0));
301 // return true if it was msc 300 // return true if it was msc
302 return true; 301 return true;
303 } 302 }
304 303
305 304
306 G4double G4GoudsmitSaundersonTable::SampleCosT 305 G4double G4GoudsmitSaundersonTable::SampleCosTheta(G4double lambdaval, G4double qval, G4double scra,
307 306 G4double lekin, G4double beta2, G4int matindx,
308 307 GSMSCAngularDtr **gsDtr, G4int &mcekini,G4int &mcdelti,
309 308 G4double &transfPar, G4bool isfirst) {
310 G4double cost = 1.; 309 G4double cost = 1.;
311 // determine the base GS angular distributio 310 // determine the base GS angular distribution if it is the first call (when sub-step sampling is used)
312 if (isfirst) { 311 if (isfirst) {
313 *gsDtr = GetGSAngularDtr(scra, lambdaval, 312 *gsDtr = GetGSAngularDtr(scra, lambdaval, qval, transfPar);
314 } 313 }
315 // sample cost from the GS angular distribut 314 // sample cost from the GS angular distribution (computed based on Screened-Rutherford DCS)
316 cost = SampleGSSRCosTheta(*gsDtr, transfPar) 315 cost = SampleGSSRCosTheta(*gsDtr, transfPar);
317 // Mott-correction if it was requested by th 316 // Mott-correction if it was requested by the user
318 if (fIsMottCorrection && *gsDtr) { // no 317 if (fIsMottCorrection && *gsDtr) { // no Mott-correction in case of izotropic theta
319 static const G4int nlooplim = 1000; 318 static const G4int nlooplim = 1000;
320 G4int nloop = 0 ; // rejection loop 319 G4int nloop = 0 ; // rejection loop counter
321 // G4int ekindx = -1; // evaluate only 320 // G4int ekindx = -1; // evaluate only in the first call
322 // G4int deltindx = -1 ; // evaluate onl 321 // G4int deltindx = -1 ; // evaluate only in the first call
323 G4double val = fMottCorrection->GetMo 322 G4double val = fMottCorrection->GetMottRejectionValue(lekin, beta2, qval, cost, matindx, mcekini, mcdelti);
324 while (G4UniformRand()>val && ++nloop<nloo 323 while (G4UniformRand()>val && ++nloop<nlooplim) {
325 // sampling cos(theta) 324 // sampling cos(theta)
326 cost = SampleGSSRCosTheta(*gsDtr, transf 325 cost = SampleGSSRCosTheta(*gsDtr, transfPar);
327 val = fMottCorrection->GetMottRejection 326 val = fMottCorrection->GetMottRejectionValue(lekin, beta2, qval, cost, matindx, mcekini, mcdelti);
328 }; 327 };
329 } 328 }
330 return cost; 329 return cost;
331 } 330 }
332 331
333 332
334 // returns with cost sampled from the GS angul 333 // returns with cost sampled from the GS angular distribution computed based on Screened-Rutherford DCS
335 G4double G4GoudsmitSaundersonTable::SampleGSSR 334 G4double G4GoudsmitSaundersonTable::SampleGSSRCosTheta(const GSMSCAngularDtr *gsDtr, G4double transfpar) {
336 // check if isotropic theta (i.e. cost is un 335 // check if isotropic theta (i.e. cost is uniform on [-1:1])
337 if (!gsDtr) { 336 if (!gsDtr) {
338 return 1.-2.0*G4UniformRand(); 337 return 1.-2.0*G4UniformRand();
339 } 338 }
340 // 339 //
341 // sampling form the selected distribution 340 // sampling form the selected distribution
342 G4double ndatm1 = gsDtr->fNumData-1.; 341 G4double ndatm1 = gsDtr->fNumData-1.;
343 G4double delta = 1.0/ndatm1; 342 G4double delta = 1.0/ndatm1;
344 // determine lower cumulative bin inidex 343 // determine lower cumulative bin inidex
345 G4double rndm = G4UniformRand(); 344 G4double rndm = G4UniformRand();
346 G4int indxl = rndm*ndatm1; 345 G4int indxl = rndm*ndatm1;
347 G4double aval = rndm-indxl*delta; 346 G4double aval = rndm-indxl*delta;
348 G4double dum0 = delta*aval; 347 G4double dum0 = delta*aval;
349 348
350 G4double dum1 = (1.0+gsDtr->fParamA[indxl] 349 G4double dum1 = (1.0+gsDtr->fParamA[indxl]+gsDtr->fParamB[indxl])*dum0;
351 G4double dum2 = delta*delta + gsDtr->fPara 350 G4double dum2 = delta*delta + gsDtr->fParamA[indxl]*dum0 + gsDtr->fParamB[indxl]*aval*aval;
352 G4double sample = gsDtr->fUValues[indxl] + 351 G4double sample = gsDtr->fUValues[indxl] + dum1/dum2 *(gsDtr->fUValues[indxl+1]-gsDtr->fUValues[indxl]);
353 // transform back u to cos(theta) : 352 // transform back u to cos(theta) :
354 // this is the sampled cos(theta) = (2.0*par 353 // this is the sampled cos(theta) = (2.0*para*sample)/(1.0-sample+para)
355 return 1.-(2.0*transfpar*sample)/(1.0-sample 354 return 1.-(2.0*transfpar*sample)/(1.0-sample+transfpar);
356 } 355 }
357 356
358 357
359 // determine the GS angular distribution we ne 358 // determine the GS angular distribution we need to sample from: will set other things as well ...
360 G4GoudsmitSaundersonTable::GSMSCAngularDtr* G4 359 G4GoudsmitSaundersonTable::GSMSCAngularDtr* G4GoudsmitSaundersonTable::GetGSAngularDtr(G4double scra,
361 360 G4double &lambdaval, G4double &qval, G4double &transfpar) {
362 GSMSCAngularDtr *dtr = nullptr; 361 GSMSCAngularDtr *dtr = nullptr;
363 G4bool first = false; 362 G4bool first = false;
364 // isotropic cost above gQMAX2 (i.e. dtr sta 363 // isotropic cost above gQMAX2 (i.e. dtr stays nullptr)
365 if (qval<gQMAX2) { 364 if (qval<gQMAX2) {
366 G4int lamIndx = -1; // lambda value in 365 G4int lamIndx = -1; // lambda value index
367 G4int qIndx = -1; // lambda value in 366 G4int qIndx = -1; // lambda value index
368 // init to second grid Q values 367 // init to second grid Q values
369 G4int numQVal = gQNUM2; 368 G4int numQVal = gQNUM2;
370 G4double minQVal = gQMIN2; 369 G4double minQVal = gQMIN2;
371 G4double invDelQ = fInvDeltaQ2; 370 G4double invDelQ = fInvDeltaQ2;
372 G4double pIndxH = 0.; // probability of 371 G4double pIndxH = 0.; // probability of taking higher index
373 // check if first or second grid needs to 372 // check if first or second grid needs to be used
374 if (qval<gQMIN2) { // first grid 373 if (qval<gQMIN2) { // first grid
375 first = true; 374 first = true;
376 // protect against qval<gQMIN1 375 // protect against qval<gQMIN1
377 if (qval<gQMIN1) { 376 if (qval<gQMIN1) {
378 qval = gQMIN1; 377 qval = gQMIN1;
379 qIndx = 0; 378 qIndx = 0;
380 //pIndxH = 0.; 379 //pIndxH = 0.;
381 } 380 }
382 // set to first grid Q values 381 // set to first grid Q values
383 numQVal = gQNUM1; 382 numQVal = gQNUM1;
384 minQVal = gQMIN1; 383 minQVal = gQMIN1;
385 invDelQ = fInvDeltaQ1; 384 invDelQ = fInvDeltaQ1;
386 } 385 }
387 // make sure that lambda = s/lambda_el is 386 // make sure that lambda = s/lambda_el is in [gLAMBMIN,gLAMBMAX)
388 // lambda<gLAMBMIN=1 is already handeled b 387 // lambda<gLAMBMIN=1 is already handeled before so lambda>= gLAMBMIN for sure
389 if (lambdaval>=gLAMBMAX) { 388 if (lambdaval>=gLAMBMAX) {
390 lambdaval = gLAMBMAX-1.e-8; 389 lambdaval = gLAMBMAX-1.e-8;
391 lamIndx = gLAMBNUM-1; 390 lamIndx = gLAMBNUM-1;
392 } 391 }
393 G4double lLambda = G4Log(lambdaval); 392 G4double lLambda = G4Log(lambdaval);
394 // 393 //
395 // determine lower lambda (=s/lambda_el) i 394 // determine lower lambda (=s/lambda_el) index: linear interp. on log(lambda) scale
396 if (lamIndx<0) { 395 if (lamIndx<0) {
397 pIndxH = (lLambda-fLogLambda0)*fInvLogD 396 pIndxH = (lLambda-fLogLambda0)*fInvLogDeltaLambda;
398 lamIndx = (G4int)(pIndxH); // low 397 lamIndx = (G4int)(pIndxH); // lower index of the lambda bin
399 pIndxH = pIndxH-lamIndx; // proba 398 pIndxH = pIndxH-lamIndx; // probability of taking the higher index distribution
400 if (G4UniformRand()<pIndxH) { 399 if (G4UniformRand()<pIndxH) {
401 ++lamIndx; 400 ++lamIndx;
402 } 401 }
403 } 402 }
404 // 403 //
405 // determine lower Q (=s/lambda_el G1) ind 404 // determine lower Q (=s/lambda_el G1) index: linear interp. on Q
406 if (qIndx<0) { 405 if (qIndx<0) {
407 pIndxH = (qval-minQVal)*invDelQ; 406 pIndxH = (qval-minQVal)*invDelQ;
408 qIndx = (G4int)(pIndxH); // low 407 qIndx = (G4int)(pIndxH); // lower index of the Q bin
409 pIndxH = pIndxH-qIndx; 408 pIndxH = pIndxH-qIndx;
410 if (G4UniformRand()<pIndxH) { 409 if (G4UniformRand()<pIndxH) {
411 ++qIndx; 410 ++qIndx;
412 } 411 }
413 } 412 }
414 // set indx 413 // set indx
415 G4int indx = lamIndx*numQVal+qIndx; 414 G4int indx = lamIndx*numQVal+qIndx;
416 if (first) { 415 if (first) {
417 dtr = gGSMSCAngularDistributions1[indx]; 416 dtr = gGSMSCAngularDistributions1[indx];
418 } else { 417 } else {
419 dtr = gGSMSCAngularDistributions2[indx]; 418 dtr = gGSMSCAngularDistributions2[indx];
420 } 419 }
421 // dtr might be nullptr that indicates iso 420 // dtr might be nullptr that indicates isotropic cot distribution because:
422 // - if the selected lamIndx, qIndx corres 421 // - if the selected lamIndx, qIndx correspond to L(=s/lambda_el) and Q(=s/lambda_el G1) such that G1(=Q/L) > 1
423 // G1 should always be < 1 and if G1 is 422 // G1 should always be < 1 and if G1 is ~1 -> the dtr is isotropic (this can only happen in case of the 2. grid)
424 // 423 //
425 // compute the transformation parameter 424 // compute the transformation parameter
426 if (lambdaval>10.0) { 425 if (lambdaval>10.0) {
427 transfpar = 0.5*(-2.77164+lLambda*( 2.94 426 transfpar = 0.5*(-2.77164+lLambda*( 2.94874-lLambda*(0.1535754-lLambda*0.00552888) ));
428 } else { 427 } else {
429 transfpar = 0.5*(1.347+lLambda*(0.209364 428 transfpar = 0.5*(1.347+lLambda*(0.209364-lLambda*(0.45525-lLambda*(0.50142-lLambda*0.081234))));
430 } 429 }
431 transfpar *= (lambdaval+4.0)*scra; 430 transfpar *= (lambdaval+4.0)*scra;
432 } 431 }
433 // return with the selected GS angular distr 432 // return with the selected GS angular distribution that we need to sample cost from (if nullptr => isotropic cost)
434 return dtr; 433 return dtr;
435 } 434 }
436 435
437 436
438 void G4GoudsmitSaundersonTable::LoadMSCData() 437 void G4GoudsmitSaundersonTable::LoadMSCData() {
>> 438 const char* path = G4FindDataDir("G4LEDATA");
>> 439 if (!path) {
>> 440 G4Exception("G4GoudsmitSaundersonTable::LoadMSCData()","em0006",
>> 441 FatalException,
>> 442 "Environment variable G4LEDATA not defined");
>> 443 return;
>> 444 }
>> 445 //
439 gGSMSCAngularDistributions1.resize(gLAMBNUM* 446 gGSMSCAngularDistributions1.resize(gLAMBNUM*gQNUM1,nullptr);
440 const G4String str1 = G4EmParameters::Instan << 447 const G4String str1 = G4String(path) + "/msc_GS/GSGrid_1/gsDistr_";
441 for (G4int il=0; il<gLAMBNUM; ++il) { 448 for (G4int il=0; il<gLAMBNUM; ++il) {
442 G4String fname = str1 + std::to_string(il) 449 G4String fname = str1 + std::to_string(il);
443 std::ifstream infile(fname,std::ios::in); 450 std::ifstream infile(fname,std::ios::in);
444 if (!infile.is_open()) { 451 if (!infile.is_open()) {
445 G4String msgc = "Cannot open file: " + f 452 G4String msgc = "Cannot open file: " + fname;
446 G4Exception("G4GoudsmitSaundersonTable:: 453 G4Exception("G4GoudsmitSaundersonTable::LoadMSCData()","em0006",
447 FatalException, msgc.c_str()); 454 FatalException, msgc.c_str());
448 return; 455 return;
449 } 456 }
450 for (G4int iq=0; iq<gQNUM1; ++iq) { 457 for (G4int iq=0; iq<gQNUM1; ++iq) {
451 auto gsd = new GSMSCAngularDtr(); 458 auto gsd = new GSMSCAngularDtr();
452 infile >> gsd->fNumData; 459 infile >> gsd->fNumData;
453 gsd->fUValues = new G4double[gsd->fNumDa 460 gsd->fUValues = new G4double[gsd->fNumData]();
454 gsd->fParamA = new G4double[gsd->fNumDa 461 gsd->fParamA = new G4double[gsd->fNumData]();
455 gsd->fParamB = new G4double[gsd->fNumDa 462 gsd->fParamB = new G4double[gsd->fNumData]();
456 G4double ddummy; 463 G4double ddummy;
457 infile >> ddummy; infile >> ddummy; 464 infile >> ddummy; infile >> ddummy;
458 for (G4int i=0; i<gsd->fNumData; ++i) { 465 for (G4int i=0; i<gsd->fNumData; ++i) {
459 infile >> gsd->fUValues[i]; 466 infile >> gsd->fUValues[i];
460 infile >> gsd->fParamA[i]; 467 infile >> gsd->fParamA[i];
461 infile >> gsd->fParamB[i]; 468 infile >> gsd->fParamB[i];
462 } 469 }
463 gGSMSCAngularDistributions1[il*gQNUM1+iq 470 gGSMSCAngularDistributions1[il*gQNUM1+iq] = gsd;
464 } 471 }
465 infile.close(); 472 infile.close();
466 } 473 }
467 // 474 //
468 // second grid 475 // second grid
469 gGSMSCAngularDistributions2.resize(gLAMBNUM* 476 gGSMSCAngularDistributions2.resize(gLAMBNUM*gQNUM2,nullptr);
470 const G4String str2 = G4EmParameters::Instan << 477 const G4String str2 = G4String(path) + "/msc_GS/GSGrid_2/gsDistr_";
471 for (G4int il=0; il<gLAMBNUM; ++il) { 478 for (G4int il=0; il<gLAMBNUM; ++il) {
472 G4String fname = str2 + std::to_string(il) 479 G4String fname = str2 + std::to_string(il);
473 std::ifstream infile(fname,std::ios::in); 480 std::ifstream infile(fname,std::ios::in);
474 if (!infile.is_open()) { 481 if (!infile.is_open()) {
475 G4String msgc = "Cannot open file: " + f 482 G4String msgc = "Cannot open file: " + fname;
476 G4Exception("G4GoudsmitSaundersonTable:: 483 G4Exception("G4GoudsmitSaundersonTable::LoadMSCData()","em0006",
477 FatalException, msgc.c_str()); 484 FatalException, msgc.c_str());
478 return; 485 return;
479 } 486 }
480 for (G4int iq=0; iq<gQNUM2; ++iq) { 487 for (G4int iq=0; iq<gQNUM2; ++iq) {
481 G4int numData; 488 G4int numData;
482 infile >> numData; 489 infile >> numData;
483 if (numData>1) { 490 if (numData>1) {
484 auto gsd = new GSMSCAngularDtr(); 491 auto gsd = new GSMSCAngularDtr();
485 gsd->fNumData = numData; 492 gsd->fNumData = numData;
486 gsd->fUValues = new G4double[gsd->fNum 493 gsd->fUValues = new G4double[gsd->fNumData]();
487 gsd->fParamA = new G4double[gsd->fNum 494 gsd->fParamA = new G4double[gsd->fNumData]();
488 gsd->fParamB = new G4double[gsd->fNum 495 gsd->fParamB = new G4double[gsd->fNumData]();
489 double ddummy; 496 double ddummy;
490 infile >> ddummy; infile >> ddummy; 497 infile >> ddummy; infile >> ddummy;
491 for (G4int i=0; i<gsd->fNumData; ++i) 498 for (G4int i=0; i<gsd->fNumData; ++i) {
492 infile >> gsd->fUValues[i]; 499 infile >> gsd->fUValues[i];
493 infile >> gsd->fParamA[i]; 500 infile >> gsd->fParamA[i];
494 infile >> gsd->fParamB[i]; 501 infile >> gsd->fParamB[i];
495 } 502 }
496 gGSMSCAngularDistributions2[il*gQNUM2+ 503 gGSMSCAngularDistributions2[il*gQNUM2+iq] = gsd;
497 } else { 504 } else {
498 gGSMSCAngularDistributions2[il*gQNUM2+ 505 gGSMSCAngularDistributions2[il*gQNUM2+iq] = nullptr;
499 } 506 }
500 } 507 }
501 infile.close(); 508 infile.close();
502 } 509 }
503 } 510 }
504 511
505 // samples cost in single scattering based on 512 // samples cost in single scattering based on Screened-Rutherford DCS
506 // (with Mott-correction if it was requested) 513 // (with Mott-correction if it was requested)
507 G4double G4GoudsmitSaundersonTable::SingleScat 514 G4double G4GoudsmitSaundersonTable::SingleScattering(G4double /*lambdaval*/, G4double scra,
508 515 G4double lekin, G4double beta2,
509 516 G4int matindx) {
510 G4double rand1 = G4UniformRand(); 517 G4double rand1 = G4UniformRand();
511 // sample cost from the Screened-Rutherford 518 // sample cost from the Screened-Rutherford DCS
512 G4double cost = 1.-2.0*scra*rand1/(1.0-rand 519 G4double cost = 1.-2.0*scra*rand1/(1.0-rand1+scra);
513 // Mott-correction if it was requested by th 520 // Mott-correction if it was requested by the user
514 if (fIsMottCorrection) { 521 if (fIsMottCorrection) {
515 static const G4int nlooplim = 1000; // re 522 static const G4int nlooplim = 1000; // rejection loop limit
516 G4int nloop = 0 ; // loop counter 523 G4int nloop = 0 ; // loop counter
517 G4int ekindx = -1 ; // evaluate only 524 G4int ekindx = -1 ; // evaluate only in the first call
518 G4int deltindx = 0 ; // single scatter 525 G4int deltindx = 0 ; // single scattering case
519 G4double q1 = 0.; // not used when 526 G4double q1 = 0.; // not used when deltindx = 0;
520 // computing Mott rejection function value 527 // computing Mott rejection function value
521 G4double val = fMottCorrection->GetMo 528 G4double val = fMottCorrection->GetMottRejectionValue(lekin, beta2, q1, cost,
522 529 matindx, ekindx, deltindx);
523 while (G4UniformRand()>val && ++nloop<nloo 530 while (G4UniformRand()>val && ++nloop<nlooplim) {
524 // sampling cos(theta) from the Screened 531 // sampling cos(theta) from the Screened-Rutherford DCS
525 rand1 = G4UniformRand(); 532 rand1 = G4UniformRand();
526 cost = 1.-2.0*scra*rand1/(1.0-rand1+scr 533 cost = 1.-2.0*scra*rand1/(1.0-rand1+scra);
527 // computing Mott rejection function val 534 // computing Mott rejection function value
528 val = fMottCorrection->GetMottRejectio 535 val = fMottCorrection->GetMottRejectionValue(lekin, beta2, q1, cost, matindx,
529 536 ekindx, deltindx);
530 }; 537 };
531 } 538 }
532 return cost; 539 return cost;
533 } 540 }
534 541
535 542
536 void G4GoudsmitSaundersonTable::GetMottCorrec 543 void G4GoudsmitSaundersonTable::GetMottCorrectionFactors(G4double logekin, G4double beta2,
537 544 G4int matindx, G4double &mcToScr,
538 545 G4double &mcToQ1, G4double &mcToG2PerG1) {
539 if (fIsMottCorrection) { 546 if (fIsMottCorrection) {
540 fMottCorrection->GetMottCorrectionFactors( 547 fMottCorrection->GetMottCorrectionFactors(logekin, beta2, matindx, mcToScr, mcToQ1, mcToG2PerG1);
541 } 548 }
542 } 549 }
543 550
544 551
545 // compute material dependent Moliere MSC para 552 // compute material dependent Moliere MSC parameters at initialisation
546 void G4GoudsmitSaundersonTable::InitMoliereMSC 553 void G4GoudsmitSaundersonTable::InitMoliereMSCParams() {
547 const G4double const1 = 7821.6; // [ 554 const G4double const1 = 7821.6; // [cm2/g]
548 const G4double const2 = 0.1569; // [ 555 const G4double const2 = 0.1569; // [cm2 MeV2 / g]
549 const G4double finstrc2 = 5.325135453E-5; / 556 const G4double finstrc2 = 5.325135453E-5; // fine-structure const. square
550 557
551 G4MaterialTable* theMaterialTable = G4Mater 558 G4MaterialTable* theMaterialTable = G4Material::GetMaterialTable();
552 // get number of materials in the table 559 // get number of materials in the table
553 std::size_t numMaterials = theMaterialTable 560 std::size_t numMaterials = theMaterialTable->size();
554 // make sure that we have long enough vecto 561 // make sure that we have long enough vectors
555 if(gMoliereBc.size()<numMaterials) { 562 if(gMoliereBc.size()<numMaterials) {
556 gMoliereBc.resize(numMaterials); 563 gMoliereBc.resize(numMaterials);
557 gMoliereXc2.resize(numMaterials); 564 gMoliereXc2.resize(numMaterials);
558 } 565 }
559 G4double xi = 1.0; 566 G4double xi = 1.0;
560 G4int maxZ = 200; 567 G4int maxZ = 200;
561 if (fIsMottCorrection || fIsPWACorrection) 568 if (fIsMottCorrection || fIsPWACorrection) {
562 // xi = 1.0; <= always set to 1 from n 569 // xi = 1.0; <= always set to 1 from now on
563 maxZ = G4GSMottCorrection::GetMaxZet(); 570 maxZ = G4GSMottCorrection::GetMaxZet();
564 } 571 }
565 // 572 //
566 for (std::size_t imat=0; imat<numMaterials; 573 for (std::size_t imat=0; imat<numMaterials; ++imat) {
567 const G4Material* theMaterial = 574 const G4Material* theMaterial = (*theMaterialTable)[imat];
568 const G4ElementVector* theElemVect = 575 const G4ElementVector* theElemVect = theMaterial->GetElementVector();
569 const G4int numelems = 576 const G4int numelems = (G4int)theMaterial->GetNumberOfElements();
570 // 577 //
571 const G4double* theNbAtomsPerVolVe 578 const G4double* theNbAtomsPerVolVect = theMaterial->GetVecNbOfAtomsPerVolume();
572 G4double theTotNbAtomsPerVo 579 G4double theTotNbAtomsPerVol = theMaterial->GetTotNbOfAtomsPerVolume();
573 // 580 //
574 G4double zs = 0.0; 581 G4double zs = 0.0;
575 G4double zx = 0.0; 582 G4double zx = 0.0;
576 G4double ze = 0.0; 583 G4double ze = 0.0;
577 G4double sa = 0.0; 584 G4double sa = 0.0;
578 // 585 //
579 for(G4int ielem = 0; ielem < numelems; ie 586 for(G4int ielem = 0; ielem < numelems; ielem++) {
580 G4double zet = (*theElemVect)[ielem]->G 587 G4double zet = (*theElemVect)[ielem]->GetZ();
581 if (zet>maxZ) { 588 if (zet>maxZ) {
582 zet = (G4double)maxZ; 589 zet = (G4double)maxZ;
583 } 590 }
584 G4double iwa = (*theElemVect)[ielem]-> 591 G4double iwa = (*theElemVect)[ielem]->GetN();
585 G4double ipz = theNbAtomsPerVolVect[ie 592 G4double ipz = theNbAtomsPerVolVect[ielem]/theTotNbAtomsPerVol;
586 G4double dum = ipz*zet*(zet+xi); 593 G4double dum = ipz*zet*(zet+xi);
587 zs += dum; 594 zs += dum;
588 ze += dum*(-2.0/3.0)*G4Log(ze 595 ze += dum*(-2.0/3.0)*G4Log(zet);
589 zx += dum*G4Log(1.0+3.34*fins 596 zx += dum*G4Log(1.0+3.34*finstrc2*zet*zet);
590 sa += ipz*iwa; 597 sa += ipz*iwa;
591 } 598 }
592 G4double density = theMaterial->GetDensit 599 G4double density = theMaterial->GetDensity()*CLHEP::cm3/CLHEP::g; // [g/cm3]
593 // 600 //
594 gMoliereBc[theMaterial->GetIndex()] = co 601 gMoliereBc[theMaterial->GetIndex()] = const1*density*zs/sa*G4Exp(ze/zs)/G4Exp(zx/zs); //[1/cm]
595 gMoliereXc2[theMaterial->GetIndex()] = co 602 gMoliereXc2[theMaterial->GetIndex()] = const2*density*zs/sa; // [MeV2/cm]
596 // change to Geant4 internal units of 1/l 603 // change to Geant4 internal units of 1/length and energ2/length
597 gMoliereBc[theMaterial->GetIndex()] *= 1 604 gMoliereBc[theMaterial->GetIndex()] *= 1.0/CLHEP::cm;
598 gMoliereXc2[theMaterial->GetIndex()] *= C 605 gMoliereXc2[theMaterial->GetIndex()] *= CLHEP::MeV*CLHEP::MeV/CLHEP::cm;
599 } 606 }
600 } 607 }
601 608
602 609
603 // this method is temporary, will be removed/r 610 // this method is temporary, will be removed/replaced with a more effictien solution after 10.3.ref09
604 G4double G4GoudsmitSaundersonTable::ComputeSca 611 G4double G4GoudsmitSaundersonTable::ComputeScatteringPowerCorrection(const G4MaterialCutsCouple *matcut, G4double ekin) {
605 G4int imc = matcut->GetIndex(); 612 G4int imc = matcut->GetIndex();
606 G4double corFactor = 1.0; 613 G4double corFactor = 1.0;
607 if (!(fSCPCPerMatCuts[imc]->fIsUse) || ekin< 614 if (!(fSCPCPerMatCuts[imc]->fIsUse) || ekin<=fSCPCPerMatCuts[imc]->fPrCut) {
608 return corFactor; 615 return corFactor;
609 } 616 }
610 // get the scattering power correction facto 617 // get the scattering power correction factor
611 G4double lekin = G4Log(ekin); 618 G4double lekin = G4Log(ekin);
612 G4double remaining = (lekin-fSCPCPerMatCuts 619 G4double remaining = (lekin-fSCPCPerMatCuts[imc]->fLEmin)*fSCPCPerMatCuts[imc]->fILDel;
613 std::size_t lindx = (std::size_t)remaining 620 std::size_t lindx = (std::size_t)remaining;
614 remaining -= lindx; 621 remaining -= lindx;
615 std::size_t imax = fSCPCPerMatCuts[imc]-> 622 std::size_t imax = fSCPCPerMatCuts[imc]->fVSCPC.size()-1;
616 if (lindx>=imax) { 623 if (lindx>=imax) {
617 corFactor = fSCPCPerMatCuts[imc]->fVSCPC[i 624 corFactor = fSCPCPerMatCuts[imc]->fVSCPC[imax];
618 } else { 625 } else {
619 corFactor = fSCPCPerMatCuts[imc]->fVSCPC[l 626 corFactor = fSCPCPerMatCuts[imc]->fVSCPC[lindx] + remaining*(fSCPCPerMatCuts[imc]->fVSCPC[lindx+1]-fSCPCPerMatCuts[imc]->fVSCPC[lindx]);
620 } 627 }
621 return corFactor; 628 return corFactor;
622 } 629 }
623 630
624 631
625 void G4GoudsmitSaundersonTable::InitSCPCorrect 632 void G4GoudsmitSaundersonTable::InitSCPCorrection() {
626 // get the material-cuts table 633 // get the material-cuts table
627 G4ProductionCutsTable *thePCTable = G4Produc 634 G4ProductionCutsTable *thePCTable = G4ProductionCutsTable::GetProductionCutsTable();
628 std::size_t numMatCuts = thePCTab 635 std::size_t numMatCuts = thePCTable->GetTableSize();
629 // clear container if any 636 // clear container if any
630 for (std::size_t imc=0; imc<fSCPCPerMatCuts. 637 for (std::size_t imc=0; imc<fSCPCPerMatCuts.size(); ++imc) {
631 if (fSCPCPerMatCuts[imc]) { 638 if (fSCPCPerMatCuts[imc]) {
632 fSCPCPerMatCuts[imc]->fVSCPC.clear(); 639 fSCPCPerMatCuts[imc]->fVSCPC.clear();
633 delete fSCPCPerMatCuts[imc]; 640 delete fSCPCPerMatCuts[imc];
634 fSCPCPerMatCuts[imc] = nullptr; 641 fSCPCPerMatCuts[imc] = nullptr;
635 } 642 }
636 } 643 }
637 // 644 //
638 // set size of the container and create the 645 // set size of the container and create the corresponding data structures
639 fSCPCPerMatCuts.resize(numMatCuts,nullptr); 646 fSCPCPerMatCuts.resize(numMatCuts,nullptr);
640 // loop over the material-cuts and create sc 647 // loop over the material-cuts and create scattering power correction data structure for each
641 for (G4int imc=0; imc<(G4int)numMatCuts; ++i 648 for (G4int imc=0; imc<(G4int)numMatCuts; ++imc) {
642 const G4MaterialCutsCouple *matCut = theP 649 const G4MaterialCutsCouple *matCut = thePCTable->GetMaterialCutsCouple(imc);
643 // get e- production cut in the current ma 650 // get e- production cut in the current material-cuts in energy
644 G4double limit; 651 G4double limit;
645 G4double ecut; 652 G4double ecut;
646 if (fIsElectron) { 653 if (fIsElectron) {
647 ecut = (*(thePCTable->GetEnergyCutsVect 654 ecut = (*(thePCTable->GetEnergyCutsVector(idxG4ElectronCut)))[matCut->GetIndex()];
648 limit = 2.*ecut; 655 limit = 2.*ecut;
649 } else { 656 } else {
650 ecut = (*(thePCTable->GetEnergyCutsVect 657 ecut = (*(thePCTable->GetEnergyCutsVector(idxG4PositronCut)))[matCut->GetIndex()];
651 limit = ecut; 658 limit = ecut;
652 } 659 }
653 G4double min = std::max(limit,fLowEnergyLi 660 G4double min = std::max(limit,fLowEnergyLimit);
654 G4double max = fHighEnergyLimit; 661 G4double max = fHighEnergyLimit;
655 if (min>=max) { 662 if (min>=max) {
656 fSCPCPerMatCuts[imc] = new SCPCorrection 663 fSCPCPerMatCuts[imc] = new SCPCorrection();
657 fSCPCPerMatCuts[imc]->fIsUse = false; 664 fSCPCPerMatCuts[imc]->fIsUse = false;
658 fSCPCPerMatCuts[imc]->fPrCut = min; 665 fSCPCPerMatCuts[imc]->fPrCut = min;
659 continue; 666 continue;
660 } 667 }
661 G4int numEbins = fNumSPCEbinPerDec*G 668 G4int numEbins = fNumSPCEbinPerDec*G4lrint(std::log10(max/min));
662 numEbins = std::max(numEbins,3 669 numEbins = std::max(numEbins,3);
663 G4double lmin = G4Log(min); 670 G4double lmin = G4Log(min);
664 G4double ldel = G4Log(max/min)/(num 671 G4double ldel = G4Log(max/min)/(numEbins-1.0);
665 fSCPCPerMatCuts[imc] = new SCPCorrection() 672 fSCPCPerMatCuts[imc] = new SCPCorrection();
666 fSCPCPerMatCuts[imc]->fVSCPC.resize(numEbi 673 fSCPCPerMatCuts[imc]->fVSCPC.resize(numEbins,1.0);
667 fSCPCPerMatCuts[imc]->fIsUse = true; 674 fSCPCPerMatCuts[imc]->fIsUse = true;
668 fSCPCPerMatCuts[imc]->fPrCut = min; 675 fSCPCPerMatCuts[imc]->fPrCut = min;
669 fSCPCPerMatCuts[imc]->fLEmin = lmin; 676 fSCPCPerMatCuts[imc]->fLEmin = lmin;
670 fSCPCPerMatCuts[imc]->fILDel = 1./ldel; 677 fSCPCPerMatCuts[imc]->fILDel = 1./ldel;
671 for (G4int ie=0; ie<numEbins; ++ie) { 678 for (G4int ie=0; ie<numEbins; ++ie) {
672 G4double ekin = G4Exp(lmin+ie*ldel); 679 G4double ekin = G4Exp(lmin+ie*ldel);
673 G4double scpCorr = 1.0; 680 G4double scpCorr = 1.0;
674 // compute correction factor: I.Kawrakow 681 // compute correction factor: I.Kawrakow NIMB 114(1996)307-326 (Eqs(32-37))
675 if (ie>0) { 682 if (ie>0) {
676 G4double tau = ekin/CLHEP::electr 683 G4double tau = ekin/CLHEP::electron_mass_c2;
677 G4double tauCut = ecut/CLHEP::electr 684 G4double tauCut = ecut/CLHEP::electron_mass_c2;
678 // Moliere's screening parameter 685 // Moliere's screening parameter
679 G4int matindx = (G4int)matCut->Get 686 G4int matindx = (G4int)matCut->GetMaterial()->GetIndex();
680 G4double A = GetMoliereXc2(mati 687 G4double A = GetMoliereXc2(matindx)/(4.0*tau*(tau+2.)*GetMoliereBc(matindx));
681 G4double gr = (1.+2.*A)*G4Log(1. 688 G4double gr = (1.+2.*A)*G4Log(1.+1./A)-2.;
682 G4double dum0 = (tau+2.)/(tau+1.); 689 G4double dum0 = (tau+2.)/(tau+1.);
683 G4double dum1 = tau+1.; 690 G4double dum1 = tau+1.;
684 G4double gm = G4Log(0.5*tau/tauC 691 G4double gm = G4Log(0.5*tau/tauCut) + (1.+dum0*dum0)*G4Log(2.*(tau-tauCut+2.)/(tau+4.))
685 - 0.25*(tau+2.)*( 692 - 0.25*(tau+2.)*( tau+2.+2.*(2.*tau+1.)/(dum1*dum1))*
686 G4Log((tau+4.)*( 693 G4Log((tau+4.)*(tau-tauCut)/tau/(tau-tauCut+2.))
687 + 0.5*(tau-2*tauCu 694 + 0.5*(tau-2*tauCut)*(tau+2.)*(1./(tau-tauCut)-1./(dum1*dum1));
688 if (gm<gr) { 695 if (gm<gr) {
689 gm = gm/gr; 696 gm = gm/gr;
690 } else { 697 } else {
691 gm = 1.; 698 gm = 1.;
692 } 699 }
693 G4double z0 = matCut->GetMaterial()-> 700 G4double z0 = matCut->GetMaterial()->GetIonisation()->GetZeffective();
694 scpCorr = 1.-gm*z0/(z0*(z0+1.)); 701 scpCorr = 1.-gm*z0/(z0*(z0+1.));
695 } 702 }
696 fSCPCPerMatCuts[imc]->fVSCPC[ie] = scpCo 703 fSCPCPerMatCuts[imc]->fVSCPC[ie] = scpCorr;
697 } 704 }
698 } 705 }
699 } 706 }
700 707