Geant4 11.1.1
Toolkit for the simulation of the passage of particles through matter
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G4PAIModelData.cc
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28//
29// GEANT4 Class
30// File name: G4PAIModelData.cc
31//
32// Author: V. Ivanchenko based on V.Grichine code of G4PAIModel
33//
34// Creation date: 16.08.2013
35//
36// Modifications:
37//
38
39#include "G4PAIModelData.hh"
40#include "G4PAIModel.hh"
41
42#include "G4SystemOfUnits.hh"
43#include "G4PhysicalConstants.hh"
44
45#include "G4PhysicsLogVector.hh"
46#include "G4PhysicsFreeVector.hh"
47#include "G4PhysicsTable.hh"
48#include "G4MaterialCutsCouple.hh"
49#include "G4SandiaTable.hh"
50#include "Randomize.hh"
51#include "G4Poisson.hh"
52
53////////////////////////////////////////////////////////////////////////
54
55using namespace std;
56
57G4PAIModelData::G4PAIModelData(G4double tmin, G4double tmax, G4int ver)
58{
59 const G4int nPerDecade = 10;
60 const G4double lowestTkin = 50*keV;
61 const G4double highestTkin = 10*TeV;
62
63 fPAIySection.SetVerbose(ver);
64
65 fLowestKineticEnergy = std::max(tmin, lowestTkin);
66 fHighestKineticEnergy = tmax;
67 if(tmax < 10*fLowestKineticEnergy) {
68 fHighestKineticEnergy = 10*fLowestKineticEnergy;
69 } else if(tmax > highestTkin) {
70 fHighestKineticEnergy = std::max(highestTkin, 10*fLowestKineticEnergy);
71 }
72 fTotBin = (G4int)(nPerDecade*
73 std::log10(fHighestKineticEnergy/fLowestKineticEnergy));
74
75 fParticleEnergyVector = new G4PhysicsLogVector(fLowestKineticEnergy,
76 fHighestKineticEnergy,
77 fTotBin);
78 if(0 < ver) {
79 G4cout << "### G4PAIModelData: Nbins= " << fTotBin
80 << " Tlowest(keV)= " << lowestTkin/keV
81 << " Tmin(keV)= " << fLowestKineticEnergy/keV
82 << " Tmax(GeV)= " << fHighestKineticEnergy/GeV
83 << G4endl;
84 }
85}
86
87////////////////////////////////////////////////////////////////////////////
88
89G4PAIModelData::~G4PAIModelData()
90{
91 std::size_t n = fPAIxscBank.size();
92 if(0 < n) {
93 for(std::size_t i=0; i<n; ++i) {
94 if(fPAIxscBank[i]) {
95 fPAIxscBank[i]->clearAndDestroy();
96 delete fPAIxscBank[i];
97 }
98 if(fPAIdEdxBank[i]) {
99 fPAIdEdxBank[i]->clearAndDestroy();
100 delete fPAIdEdxBank[i];
101 }
102 delete fdEdxTable[i];
103 }
104 }
105 delete fParticleEnergyVector;
106}
107
108///////////////////////////////////////////////////////////////////////////////
109
110void G4PAIModelData::Initialise(const G4MaterialCutsCouple* couple,
111 G4PAIModel* model)
112{
113 const G4Material* mat = couple->GetMaterial();
114 fSandia.Initialize(const_cast<G4Material*>(mat));
115
116 auto PAItransferTable = new G4PhysicsTable(fTotBin+1);
117 auto PAIdEdxTable = new G4PhysicsTable(fTotBin+1);
118 auto dEdxMeanVector =
119 new G4PhysicsLogVector(fLowestKineticEnergy,
120 fHighestKineticEnergy,
121 fTotBin);
122 // low energy Sandia interval
123 G4double Tmin = fSandia.GetSandiaMatTablePAI(0,0);
124
125 // energy safety
126 static const G4double deltaLow = 100.*eV;
127
128 for (G4int i = 0; i <= fTotBin; ++i) {
129
130 G4double kinEnergy = fParticleEnergyVector->Energy(i);
131 G4double Tmax = model->ComputeMaxEnergy(kinEnergy);
132 G4double tau = kinEnergy/proton_mass_c2;
133 G4double bg2 = tau*( tau + 2. );
134
135 if (Tmax < Tmin + deltaLow ) { Tmax = Tmin + deltaLow; }
136
137 fPAIySection.Initialize(mat, Tmax, bg2, &fSandia);
138
139 //G4cout << i << ". TransferMax(keV)= "<< Tmax/keV
140 // << " E(MeV)= " << kinEnergy/MeV << G4endl;
141
142 G4int n = fPAIySection.GetSplineSize();
143 G4int kmin = 0;
144 for(G4int k = 0; k < n; ++k) {
145 if(fPAIySection.GetIntegralPAIySection(k+1) <= 0.0) {
146 kmin = k;
147 } else {
148 break;
149 }
150 }
151 n -= kmin;
152
153 auto transferVector = new G4PhysicsFreeVector(n);
154 auto dEdxVector = new G4PhysicsFreeVector(n);
155
156 //G4double tr0 = 0.0;
157 G4double tr = 0.0;
158 for(G4int k = kmin; k < n; ++k)
159 {
160 G4double t = fPAIySection.GetSplineEnergy(k+1);
161 tr = fPAIySection.GetIntegralPAIySection(k+1);
162 //if(tr >= tr0) { tr0 = tr; }
163 //else { G4cout << "G4PAIModelData::Initialise Warning: Ekin(MeV)= "
164 // << t/MeV << " IntegralTransfer= " << tr
165 // << " < " << tr0 << G4endl; }
166 transferVector->PutValue(k, t, t*tr);
167 dEdxVector->PutValue(k, t, fPAIySection.GetIntegralPAIdEdx(k+1));
168 }
169 //G4cout << "TransferVector:" << G4endl;
170 //G4cout << *transferVector << G4endl;
171 //G4cout << "DEDXVector:" << G4endl;
172 //G4cout << *dEdxVector << G4endl;
173
174 G4double ionloss = fPAIySection.GetMeanEnergyLoss();// total <dE/dx>
175
176 if(ionloss < 0.0) ionloss = 0.0;
177
178 dEdxMeanVector->PutValue(i,ionloss);
179
180 PAItransferTable->insertAt(i,transferVector);
181 PAIdEdxTable->insertAt(i,dEdxVector);
182
183 } // end of Tkin loop`
184 fPAIxscBank.push_back(PAItransferTable);
185 fPAIdEdxBank.push_back(PAIdEdxTable);
186 //G4cout << "dEdxMeanVector: " << G4endl;
187 //G4cout << *dEdxMeanVector << G4endl;
188 fdEdxTable.push_back(dEdxMeanVector);
189}
190
191//////////////////////////////////////////////////////////////////////////////
192
193G4double G4PAIModelData::DEDXPerVolume(G4int coupleIndex, G4double scaledTkin,
194 G4double cut) const
195{
196 // VI: iPlace is the low edge index of the bin
197 // iPlace is in interval from 0 to (N-1)
198 std::size_t iPlace(0);
199 G4double dEdx = fdEdxTable[coupleIndex]->Value(scaledTkin, iPlace);
200 std::size_t nPlace = fParticleEnergyVector->GetVectorLength() - 1;
201 /*
202 G4cout << "G4PAIModelData::DEDXPerVolume: coupleIdx= " << coupleIndex
203 << " Tscaled= " << scaledTkin << " cut= " << cut
204 << " iPlace= " << iPlace << " nPlace= " << nPlace << G4endl;
205 */
206 G4bool one = true;
207 if(scaledTkin >= fParticleEnergyVector->Energy(nPlace)) { iPlace = nPlace; }
208 else if(scaledTkin > fParticleEnergyVector->Energy(0)) {
209 one = false;
210 }
211
212 // VI: apply interpolation of the vector
213 G4double del = (*(fPAIdEdxBank[coupleIndex]))(iPlace)->Value(cut);
214 //G4cout << "dEdx= " << dEdx << " del= " << del << G4endl;
215 if(!one) {
216 G4double del2 = (*(fPAIdEdxBank[coupleIndex]))(iPlace+1)->Value(cut);
217 G4double E1 = fParticleEnergyVector->Energy(iPlace);
218 G4double E2 = fParticleEnergyVector->Energy(iPlace+1);
219 G4double W = 1.0/(E2 - E1);
220 G4double W1 = (E2 - scaledTkin)*W;
221 G4double W2 = (scaledTkin - E1)*W;
222 del *= W1;
223 del += W2*del2;
224 }
225 dEdx -= del;
226 //G4cout << "dEdx= " << dEdx << " del= " << del << G4endl;
227
228 dEdx = std::max(dEdx, 0.);
229 return dEdx;
230}
231
232/////////////////////////////////////////////////////////////////////////
233
234G4double
235G4PAIModelData::CrossSectionPerVolume(G4int coupleIndex,
236 G4double scaledTkin,
237 G4double tcut, G4double tmax) const
238{
239 G4double cross, cross1, cross2;
240
241 // iPlace is in interval from 0 to (N-1)
242 std::size_t iPlace = fParticleEnergyVector->FindBin(scaledTkin, 0);
243 std::size_t nPlace = fParticleEnergyVector->GetVectorLength() - 1;
244
245 G4bool one = true;
246 if(scaledTkin >= fParticleEnergyVector->Energy(nPlace)) { iPlace = nPlace; }
247 else if(scaledTkin > fParticleEnergyVector->Energy(0)) {
248 one = false;
249 }
250 G4PhysicsTable* table = fPAIxscBank[coupleIndex];
251
252 //G4cout<<"iPlace = "<<iPlace<<"; tmax = "
253 // <<tmax<<"; cutEnergy = "<<cutEnergy<<G4endl;
254 cross1 = (*table)(iPlace)->Value(tmax)/tmax;
255 //G4cout<<"cross1 = "<<cross1<<G4endl;
256 cross2 = (*table)(iPlace)->Value(tcut)/tcut;
257 //G4cout<<"cross2 = "<<cross2<<G4endl;
258 cross = (cross2-cross1);
259 //G4cout<<"cross = "<<cross<<G4endl;
260 if(!one) {
261 cross2 = (*table)(iPlace+1)->Value(tcut)/tcut
262 - (*table)(iPlace+1)->Value(tmax)/tmax;
263
264 G4double E1 = fParticleEnergyVector->Energy(iPlace);
265 G4double E2 = fParticleEnergyVector->Energy(iPlace+1);
266 G4double W = 1.0/(E2 - E1);
267 G4double W1 = (E2 - scaledTkin)*W;
268 G4double W2 = (scaledTkin - E1)*W;
269 cross *= W1;
270 cross += W2*cross2;
271 }
272
273 cross = std::max(cross, 0.0);
274 return cross;
275}
276
277///////////////////////////////////////////////////////////////////////
278
279G4double G4PAIModelData::SampleAlongStepTransfer(G4int coupleIndex,
280 G4double kinEnergy,
281 G4double scaledTkin,
282 G4double tmax,
283 G4double stepFactor) const
284{
285 //G4cout << "=== G4PAIModelData::SampleAlongStepTransfer" << G4endl;
286 G4double loss = 0.0;
287
288 std::size_t iPlace = fParticleEnergyVector->FindBin(scaledTkin, 0);
289 std::size_t nPlace = fParticleEnergyVector->GetVectorLength() - 1;
290
291 G4bool one = true;
292 if(scaledTkin >= fParticleEnergyVector->Energy(nPlace)) { iPlace = nPlace; }
293 else if(scaledTkin > fParticleEnergyVector->Energy(0)) {
294 one = false;
295 }
296
297 G4double meanNumber = 0.0;
298 G4double meanN11 = 0.0;
299 G4double meanN12 = 0.0;
300 G4double meanN21 = 0.0;
301 G4double meanN22 = 0.0;
302
303 G4PhysicsVector* v1 = (*(fPAIxscBank[coupleIndex]))(iPlace);
304 G4PhysicsVector* v2 = nullptr;
305
306 G4double e1 = v1->Energy(0);
307 G4double e2 = std::min(tmax, v1->GetMaxEnergy());
308
309 if(e2 >= e1) {
310 meanN11 = (*v1)[0]/e1;
311 meanN12 = v1->Value(e2)/e2;
312 meanNumber = (meanN11 - meanN12)*stepFactor;
313 }
314 //G4cout<<"iPlace = "<<iPlace<< " meanN11= " << meanN11
315 // << " meanN12= " << meanN12 << G4endl;
316
317 G4double W1 = 1.0;
318 G4double W2 = 0.0;
319 if(!one) {
320 v2 = (*(fPAIxscBank[coupleIndex]))(iPlace+1);
321
322 e1 = v2->Energy(0);
323 e2 = std::min(tmax, v2->GetMaxEnergy());
324 if(e2 >= e1) {
325 meanN21 = (*v2)[0]/e1;
326 meanN22 = v2->Value(e2)/e2;
327 G4double E1 = fParticleEnergyVector->Energy(iPlace);
328 G4double E2 = fParticleEnergyVector->Energy(iPlace+1);
329 G4double W = 1.0/(E2 - E1);
330 W1 = (E2 - scaledTkin)*W;
331 W2 = (scaledTkin - E1)*W;
332 meanNumber *= W1;
333 meanNumber += (meanN21 - meanN22)*stepFactor*W2;
334 }
335 }
336
337 if(meanNumber < 0.0) { return loss; }
338 G4int numOfCollisions = (G4int)G4Poisson(meanNumber);
339
340 //G4cout << "meanNumber= " << meanNumber << " N= " << numOfCollisions << G4endl;
341
342 if(0 == numOfCollisions) { return loss; }
343
344 G4double position, omega, omega2;
345 for(G4int i=0; i< numOfCollisions; ++i) {
346 G4double rand = G4UniformRand();
347 position = meanN12 + (meanN11 - meanN12)*rand;
348 omega = GetEnergyTransfer(coupleIndex, iPlace, position);
349 //G4cout << "omega(keV)= " << omega/keV << G4endl;
350 if(!one) {
351 position = meanN22 + (meanN21 - meanN22)*rand;
352 omega2 = GetEnergyTransfer(coupleIndex, iPlace+1, position);
353 omega *= W1;
354 omega += omega2*W2;
355 }
356 //G4cout << "omega(keV)= " << omega/keV << G4endl;
357
358 loss += omega;
359 if(loss > kinEnergy) { break; }
360 }
361
362 //G4cout<<"PAIModelData AlongStepLoss = "<<loss/keV<<" keV"<<G4endl;
363 if(loss > kinEnergy) { loss = kinEnergy; }
364 else if(loss < 0.) { loss = 0.; }
365 return loss;
366}
367
368///////////////////////////////////////////////////////////////////////
369//
370// Returns post step PAI energy transfer > cut electron energy
371// according to passed scaled kinetic energy of particle
372
373G4double G4PAIModelData::SamplePostStepTransfer(G4int coupleIndex,
374 G4double scaledTkin,
375 G4double tmin,
376 G4double tmax) const
377{
378 //G4cout<<"=== G4PAIModelData::SamplePostStepTransfer idx= "<< coupleIndex
379 // << " Tkin= " << scaledTkin << " Tmax= " << tmax << G4endl;
380 G4double transfer = 0.0;
381 G4double rand = G4UniformRand();
382
383 std::size_t nPlace = fParticleEnergyVector->GetVectorLength() - 1;
384 std::size_t iPlace = fParticleEnergyVector->FindBin(scaledTkin, 0);
385
386 G4bool one = true;
387 if(scaledTkin >= fParticleEnergyVector->Energy(nPlace)) { iPlace = nPlace; }
388 else if(scaledTkin > fParticleEnergyVector->Energy(0)) {
389 one = false;
390 }
391 G4PhysicsTable* table = fPAIxscBank[coupleIndex];
392 G4PhysicsVector* v1 = (*table)[iPlace];
393
394 G4double emin = std::max(tmin, v1->Energy(0));
395 G4double emax = std::min(tmax, v1->GetMaxEnergy());
396 if(emax < emin) { return transfer; }
397
398 G4double dNdx1 = v1->Value(emin)/emin;
399 G4double dNdx2 = v1->Value(emax)/emax;
400 /*
401 G4cout << "iPlace= " << iPlace << " nPlace= " << nPlace
402 << " emin= " << emin << " emax= " << emax
403 << " dNdx1= " << dNdx1 << " dNdx2= " << dNdx2
404 << " one: " << one << G4endl;
405 */
406 G4double position = dNdx2 + (dNdx1 - dNdx2)*rand;
407 transfer = GetEnergyTransfer(coupleIndex, iPlace, position);
408
409 //G4cout<<"PAImodel PostStepTransfer = "<<transfer/keV<<" keV"
410 // << " position= " << position << G4endl;
411
412 if(!one) {
413
414 G4PhysicsVector* v2 = (*table)[iPlace+1];
415 emin = std::max(tmin, v2->Energy(0));
416 emax = std::min(tmax, v2->GetMaxEnergy());
417 if(emin <= emax) {
418 dNdx1 = v2->Value(emin)/emin;
419 dNdx2 = v2->Value(emax)/emax;
420
421 //G4cout << " emax2= " << emax
422 // << " dNdx2= " << dNdx2 << " dNdx1= " << dNdx1 << G4endl;
423
424 G4double E1 = fParticleEnergyVector->Energy(iPlace);
425 G4double E2 = fParticleEnergyVector->Energy(iPlace+1);
426 G4double W = 1.0/(E2 - E1);
427 G4double W1 = (E2 - scaledTkin)*W;
428 G4double W2 = (scaledTkin - E1)*W;
429
430 //G4cout<< "E1= " << E1 << " E2= " << E2 <<" iPlace= " << iPlace
431 // << " W1= " << W1 << " W2= " << W2 <<G4endl;
432
433 position = dNdx2 + (dNdx1 - dNdx2)*rand;
434 G4double tr2 = GetEnergyTransfer(coupleIndex, iPlace+1, position);
435
436 //G4cout<<"PAImodel PostStepTransfer1 = "<<tr2/keV<<" keV"
437 // << " position= " << position << G4endl;
438 transfer *= W1;
439 transfer += tr2*W2;
440 }
441 }
442 //G4cout<<"PAImodel PostStepTransfer = "<<transfer/keV<<" keV"
443 // << " position= " << position << G4endl;
444 transfer = std::max(transfer, 0.0);
445 return transfer;
446}
447
448///////////////////////////////////////////////////////////////////////
449//
450// Returns PAI energy transfer according to passed
451// indexes of particle kinetic enegry and random x-section
452
453G4double G4PAIModelData::GetEnergyTransfer(G4int coupleIndex,
454 std::size_t iPlace,
455 G4double position) const
456{
457 G4PhysicsVector* v = (*(fPAIxscBank[coupleIndex]))(iPlace);
458 if(position*v->Energy(0) >= (*v)[0]) { return v->Energy(0); }
459
460 std::size_t iTransferMax = v->GetVectorLength() - 1;
461
462 std::size_t iTransfer;
463 G4double x1(0.0), x2(0.0), y1(0.0), y2(0.0), energyTransfer;
464
465 //G4cout << "iPlace= " << iPlace << " iTransferMax= " << iTransferMax << G4endl;
466 for(iTransfer=1; iTransfer<=iTransferMax; ++iTransfer) {
467 x2 = v->Energy(iTransfer);
468 y2 = (*v)[iTransfer]/x2;
469 if(position >= y2) { break; }
470 if(iTransfer == iTransferMax) { return v->GetMaxEnergy(); }
471 }
472
473 x1 = v->Energy(iTransfer-1);
474 y1 = (*v)[iTransfer-1]/x1;
475 /*
476 G4cout << "i= " << iTransfer << " imax= " << iTransferMax
477 << " x1= " << x1 << " x2= " << x2
478 << " y1= " << y1 << " y2= " << y2 << G4endl;
479 */
480 energyTransfer = x1;
481 if ( x1 != x2 ) {
482 if ( y1 == y2 ) {
483 energyTransfer += (x2 - x1)*G4UniformRand();
484 } else {
485 if(x1*1.1 < x2) {
486 const G4int nbins = 5;
487 G4double del = (x2 - x1)/G4int(nbins);
488 x2 = x1;
489 for(G4int i=1; i<=nbins; ++i) {
490 x2 += del;
491 y2 = v->Value(x2)/x2;
492 if(position >= y2) {
493 break;
494 }
495 x1 = x2;
496 y1 = y2;
497 }
498 }
499 //G4cout << "x1(keV)= " << x1/keV << " x2(keV)= " << x2/keV
500 // << " y1= " << y1 << " y2= " << y2 << " pos= " << position << G4endl;
501 energyTransfer = (y2 - y1)*x1*x2/(position*(x1 - x2) - y1*x1 + y2*x2);
502 }
503 }
504 //G4cout << "x1(keV)= " << x1/keV << " x2(keV)= " << x2/keV
505 // << " y1= " << y1 << " y2= " << y2 << " pos= " << position
506 // << " E(keV)= " << energyTransfer/keV << G4endl;
507 return energyTransfer;
508}
509
510//////////////////////////////////////////////////////////////////////
511
G4Poisson
G4long G4Poisson(G4double mean)
Definition: G4Poisson.hh:50
G4double
double G4double
Definition: G4Types.hh:83
G4bool
bool G4bool
Definition: G4Types.hh:86
G4int
int G4int
Definition: G4Types.hh:85
G4endl
#define G4endl
Definition: G4ios.hh:57
G4cout
G4GLOB_DLL std::ostream G4cout
G4UniformRand
#define G4UniformRand()
Definition: Randomize.hh:52
G4MaterialCutsCouple::GetMaterial
const G4Material * GetMaterial() const
Definition: G4MaterialCutsCouple.hh:166
G4PAIModelData::DEDXPerVolume
G4double DEDXPerVolume(G4int coupleIndex, G4double scaledTkin, G4double cut) const
Definition: G4PAIModelData.cc:193
G4PAIModelData::Initialise
void Initialise(const G4MaterialCutsCouple *, G4PAIModel *)
Definition: G4PAIModelData.cc:110
G4PAIModelData::SamplePostStepTransfer
G4double SamplePostStepTransfer(G4int coupleIndex, G4double scaledTkin, G4double tmin, G4double tmax) const
Definition: G4PAIModelData.cc:373
G4PAIModelData::G4PAIModelData
G4PAIModelData(G4double tmin, G4double tmax, G4int verbose)
Definition: G4PAIModelData.cc:57
G4PAIModelData::SampleAlongStepTransfer
G4double SampleAlongStepTransfer(G4int coupleIndex, G4double kinEnergy, G4double scaledTkin, G4double tmax, G4double stepFactor) const
Definition: G4PAIModelData.cc:279
G4PAIModelData::CrossSectionPerVolume
G4double CrossSectionPerVolume(G4int coupleIndex, G4double scaledTkin, G4double tcut, G4double tmax) const
Definition: G4PAIModelData.cc:235
G4PAIModel::ComputeMaxEnergy
G4double ComputeMaxEnergy(G4double scaledEnergy)
Definition: G4PAIModel.hh:166
G4PAIySection::GetSplineEnergy
G4double GetSplineEnergy(G4int i) const
Definition: G4PAIySection.hh:203
G4PAIySection::SetVerbose
void SetVerbose(G4int v)
Definition: G4PAIySection.hh:139
G4PAIySection::GetIntegralPAIdEdx
G4double GetIntegralPAIdEdx(G4int i) const
Definition: G4PAIySection.hh:215
G4PAIySection::GetMeanEnergyLoss
G4double GetMeanEnergyLoss() const
Definition: G4PAIySection.hh:124
G4PAIySection::GetIntegralPAIySection
G4double GetIntegralPAIySection(G4int i) const
Definition: G4PAIySection.hh:209
G4PAIySection::GetSplineSize
G4int GetSplineSize() const
Definition: G4PAIySection.hh:114
G4PAIySection::Initialize
void Initialize(const G4Material *material, G4double maxEnergyTransfer, G4double betaGammaSq, G4SandiaTable *)
Definition: G4PAIySection.cc:118
G4PhysicsVector::GetMaxEnergy
G4double GetMaxEnergy() const
G4PhysicsVector::Energy
G4double Energy(const std::size_t index) const
G4PhysicsVector::Value
G4double Value(const G4double energy, std::size_t &lastidx) const
G4PhysicsVector::GetVectorLength
std::size_t GetVectorLength() const
G4PhysicsVector::FindBin
std::size_t FindBin(const G4double energy, std::size_t idx) const
Definition: G4PhysicsVector.cc:173
G4SandiaTable::Initialize
void Initialize(const G4Material *)
Definition: G4SandiaTable.cc:715
G4SandiaTable::GetSandiaMatTablePAI
G4double GetSandiaMatTablePAI(G4int, G4int) const
Definition: G4SandiaTable.cc:1066
W
#define W
Definition: crc32.c:84