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Toolkit for the simulation of the passage of particles through matter
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G4eIonisationSpectrum.cc
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25//
26//
27// -------------------------------------------------------------------
28//
29// GEANT4 Class file
30//
31//
32// File name: G4eIonisationSpectrum
33//
34// Author: V.Ivanchenko ([email protected])
35//
36// Creation date: 29 September 2001
37//
38// Modifications:
39// 10.10.2001 MGP Revision to improve code quality and
40// consistency with design
41// 02.11.2001 VI Optimize sampling of energy
42// 29.11.2001 VI New parametrisation
43// 19.04.2002 VI Add protection in case of energy below binding
44// 30.05.2002 VI Update to 24-parameters data
45// 11.07.2002 VI Fix in integration over spectrum
46// 23.03.2009 LP Added protection against division by zero (for
47// faulty database files), Bug Report 1042
48//
49// -------------------------------------------------------------------
50//
51
52#include "G4eIonisationSpectrum.hh"
53#include "G4AtomicTransitionManager.hh"
54#include "G4AtomicShell.hh"
55#include "G4DataVector.hh"
56#include "Randomize.hh"
57#include "G4PhysicalConstants.hh"
58#include "G4SystemOfUnits.hh"
59#include "G4Exp.hh"
60
61G4eIonisationSpectrum::G4eIonisationSpectrum():G4VEnergySpectrum(),
62 lowestE(0.1*eV),
63 factor(1.3),
64 iMax(24),
65 verbose(0)
66{
67 theParam = new G4eIonisationParameters();
68}
69
70
71G4eIonisationSpectrum::~G4eIonisationSpectrum()
72{
73 delete theParam;
74}
75
76
77G4double G4eIonisationSpectrum::Probability(G4int Z,
78 G4double tMin,
79 G4double tMax,
80 G4double e,
81 G4int shell,
82 const G4ParticleDefinition* ) const
83{
84 // Please comment what Probability does and what are the three
85 // functions mentioned below
86 // Describe the algorithms used
87
88 G4double eMax = MaxEnergyOfSecondaries(e);
89 G4double t0 = std::max(tMin, lowestE);
90 G4double tm = std::min(tMax, eMax);
91 if(t0 >= tm) return 0.0;
92
93 G4double bindingEnergy = (G4AtomicTransitionManager::Instance())->
94 Shell(Z, shell)->BindingEnergy();
95
96 if(e <= bindingEnergy) return 0.0;
97
98 G4double energy = e + bindingEnergy;
99
100 G4double x1 = std::min(0.5,(t0 + bindingEnergy)/energy);
101 G4double x2 = std::min(0.5,(tm + bindingEnergy)/energy);
102
103 if(verbose > 1 || (Z==4 && e>= 1.0 && e<= 0.0)) {
104 G4cout << "G4eIonisationSpectrum::Probability: Z= " << Z
105 << "; shell= " << shell
106 << "; E(keV)= " << e/keV
107 << "; Eb(keV)= " << bindingEnergy/keV
108 << "; x1= " << x1
109 << "; x2= " << x2
110 << G4endl;
111
112 }
113
114 G4DataVector p;
115
116 // Access parameters
117 for (G4int i=0; i<iMax; i++)
118 {
119 G4double x = theParam->Parameter(Z, shell, i, e);
120 if(i<4) x /= energy;
121 p.push_back(x);
122 }
123
124 if(p[3] > 0.5) p[3] = 0.5;
125
126 G4double gLocal = energy/electron_mass_c2 + 1.;
127 p.push_back((2.0*gLocal - 1.0)/(gLocal*gLocal));
128
129 //Add protection against division by zero: actually in Function()
130 //parameter p[3] appears in the denominator. Bug report 1042
131 if (p[3] > 0)
132 p[iMax-1] = Function(p[3], p);
133 else
134 {
135 G4cout << "WARNING: G4eIonisationSpectrum::Probability "
136 << "parameter p[3] <= 0. G4LEDATA dabatase might be corrupted for Z = "
137 << Z << ". Please check and/or update it " << G4endl;
138 }
139
140 if(e >= 1. && e <= 0. && Z == 4) p.push_back(0.0);
141
142
143 G4double val = IntSpectrum(x1, x2, p);
144 G4double x0 = (lowestE + bindingEnergy)/energy;
145 G4double nor = IntSpectrum(x0, 0.5, p);
146
147 if(verbose > 1 || (Z==4 && e>= 1.0 && e<= 0.0)) {
148 G4cout << "tcut= " << tMin
149 << "; tMax= " << tMax
150 << "; x0= " << x0
151 << "; x1= " << x1
152 << "; x2= " << x2
153 << "; val= " << val
154 << "; nor= " << nor
155 << "; sum= " << p[0]
156 << "; a= " << p[1]
157 << "; b= " << p[2]
158 << "; c= " << p[3]
159 << G4endl;
160 if(shell == 1) G4cout << "============" << G4endl;
161 }
162
163 p.clear();
164
165 if(nor > 0.0) val /= nor;
166 else val = 0.0;
167
168 return val;
169}
170
171
172G4double G4eIonisationSpectrum::AverageEnergy(G4int Z,
173 G4double tMin,
174 G4double tMax,
175 G4double e,
176 G4int shell,
177 const G4ParticleDefinition* ) const
178{
179 // Please comment what AverageEnergy does and what are the three
180 // functions mentioned below
181 // Describe the algorithms used
182
183 G4double eMax = MaxEnergyOfSecondaries(e);
184 G4double t0 = std::max(tMin, lowestE);
185 G4double tm = std::min(tMax, eMax);
186 if(t0 >= tm) return 0.0;
187
188 G4double bindingEnergy = (G4AtomicTransitionManager::Instance())->
189 Shell(Z, shell)->BindingEnergy();
190
191 if(e <= bindingEnergy) return 0.0;
192
193 G4double energy = e + bindingEnergy;
194
195 G4double x1 = std::min(0.5,(t0 + bindingEnergy)/energy);
196 G4double x2 = std::min(0.5,(tm + bindingEnergy)/energy);
197
198 if(verbose > 1) {
199 G4cout << "G4eIonisationSpectrum::AverageEnergy: Z= " << Z
200 << "; shell= " << shell
201 << "; E(keV)= " << e/keV
202 << "; bindingE(keV)= " << bindingEnergy/keV
203 << "; x1= " << x1
204 << "; x2= " << x2
205 << G4endl;
206 }
207
208 G4DataVector p;
209
210 // Access parameters
211 for (G4int i=0; i<iMax; i++)
212 {
213 G4double x = theParam->Parameter(Z, shell, i, e);
214 if(i<4) x /= energy;
215 p.push_back(x);
216 }
217
218 if(p[3] > 0.5) p[3] = 0.5;
219
220 G4double gLocal2 = energy/electron_mass_c2 + 1.;
221 p.push_back((2.0*gLocal2 - 1.0)/(gLocal2*gLocal2));
222
223
224 //Add protection against division by zero: actually in Function()
225 //parameter p[3] appears in the denominator. Bug report 1042
226 if (p[3] > 0)
227 p[iMax-1] = Function(p[3], p);
228 else
229 {
230 G4cout << "WARNING: G4eIonisationSpectrum::AverageEnergy "
231 << "parameter p[3] <= 0. G4LEDATA dabatase might be corrupted for Z = "
232 << Z << ". Please check and/or update it " << G4endl;
233 }
234
235 G4double val = AverageValue(x1, x2, p);
236 G4double x0 = (lowestE + bindingEnergy)/energy;
237 G4double nor = IntSpectrum(x0, 0.5, p);
238 val *= energy;
239
240 if(verbose > 1) {
241 G4cout << "tcut(MeV)= " << tMin/MeV
242 << "; tMax(MeV)= " << tMax/MeV
243 << "; x0= " << x0
244 << "; x1= " << x1
245 << "; x2= " << x2
246 << "; val= " << val
247 << "; nor= " << nor
248 << "; sum= " << p[0]
249 << "; a= " << p[1]
250 << "; b= " << p[2]
251 << "; c= " << p[3]
252 << G4endl;
253 }
254
255 p.clear();
256
257 if(nor > 0.0) val /= nor;
258 else val = 0.0;
259
260 return val;
261}
262
263
264G4double G4eIonisationSpectrum::SampleEnergy(G4int Z,
265 G4double tMin,
266 G4double tMax,
267 G4double e,
268 G4int shell,
269 const G4ParticleDefinition* ) const
270{
271 // Please comment what SampleEnergy does
272 G4double tDelta = 0.0;
273 G4double t0 = std::max(tMin, lowestE);
274 G4double tm = std::min(tMax, MaxEnergyOfSecondaries(e));
275 if(t0 > tm) return tDelta;
276
277 G4double bindingEnergy = (G4AtomicTransitionManager::Instance())->
278 Shell(Z, shell)->BindingEnergy();
279
280 if(e <= bindingEnergy) return 0.0;
281
282 G4double energy = e + bindingEnergy;
283
284 G4double x1 = std::min(0.5,(t0 + bindingEnergy)/energy);
285 G4double x2 = std::min(0.5,(tm + bindingEnergy)/energy);
286 if(x1 >= x2) return tDelta;
287
288 if(verbose > 1) {
289 G4cout << "G4eIonisationSpectrum::SampleEnergy: Z= " << Z
290 << "; shell= " << shell
291 << "; E(keV)= " << e/keV
292 << G4endl;
293 }
294
295 // Access parameters
296 G4DataVector p;
297
298 // Access parameters
299 for (G4int i=0; i<iMax; i++)
300 {
301 G4double x = theParam->Parameter(Z, shell, i, e);
302 if(i<4) x /= energy;
303 p.push_back(x);
304 }
305
306 if(p[3] > 0.5) p[3] = 0.5;
307
308 G4double gLocal3 = energy/electron_mass_c2 + 1.;
309 p.push_back((2.0*gLocal3 - 1.0)/(gLocal3*gLocal3));
310
311
312 //Add protection against division by zero: actually in Function()
313 //parameter p[3] appears in the denominator. Bug report 1042
314 if (p[3] > 0)
315 p[iMax-1] = Function(p[3], p);
316 else
317 {
318 G4cout << "WARNING: G4eIonisationSpectrum::SampleSpectrum "
319 << "parameter p[3] <= 0. G4LEDATA dabatase might be corrupted for Z = "
320 << Z << ". Please check and/or update it " << G4endl;
321 }
322
323 G4double aria1 = 0.0;
324 G4double a1 = std::max(x1,p[1]);
325 G4double a2 = std::min(x2,p[3]);
326 if(a1 < a2) aria1 = IntSpectrum(a1, a2, p);
327 G4double aria2 = 0.0;
328 G4double a3 = std::max(x1,p[3]);
329 G4double a4 = x2;
330 if(a3 < a4) aria2 = IntSpectrum(a3, a4, p);
331
332 G4double aria = (aria1 + aria2)*G4UniformRand();
333 G4double amaj, fun, q, x, z1, z2, dx, dx1;
334
335 //======= First aria to sample =====
336
337 if(aria <= aria1) {
338
339 amaj = p[4];
340 for (G4int j=5; j<iMax; j++) {
341 if(p[j] > amaj) amaj = p[j];
342 }
343
344 a1 = 1./a1;
345 a2 = 1./a2;
346
347 G4int i;
348 do {
349
350 x = 1./(a2 + G4UniformRand()*(a1 - a2));
351 z1 = p[1];
352 z2 = p[3];
353 dx = (p[2] - p[1]) / 3.0;
354 dx1= G4Exp(std::log(p[3]/p[2]) / 16.0);
355 for (i=4; i<iMax-1; i++) {
356
357 if (i < 7) {
358 z2 = z1 + dx;
359 } else if(iMax-2 == i) {
360 z2 = p[3];
361 break;
362 } else {
363 z2 = z1*dx1;
364 }
365 if(x >= z1 && x <= z2) break;
366 z1 = z2;
367 }
368 fun = p[i] + (x - z1) * (p[i+1] - p[i])/(z2 - z1);
369
370 if(fun > amaj) {
371 G4cout << "WARNING in G4eIonisationSpectrum::SampleEnergy:"
372 << " Majoranta " << amaj
373 << " < " << fun
374 << " in the first aria at x= " << x
375 << G4endl;
376 }
377
378 q = amaj*G4UniformRand();
379
380 } while (q >= fun);
381
382 //======= Second aria to sample =====
383
384 } else {
385
386 amaj = std::max(p[iMax-1], Function(0.5, p)) * factor;
387 a1 = 1./a3;
388 a2 = 1./a4;
389
390 do {
391
392 x = 1./(a2 + G4UniformRand()*(a1 - a2));
393 fun = Function(x, p);
394
395 if(fun > amaj) {
396 G4cout << "WARNING in G4eIonisationSpectrum::SampleEnergy:"
397 << " Majoranta " << amaj
398 << " < " << fun
399 << " in the second aria at x= " << x
400 << G4endl;
401 }
402
403 q = amaj*G4UniformRand();
404
405 } while (q >= fun);
406
407 }
408
409 p.clear();
410
411 tDelta = x*energy - bindingEnergy;
412
413 if(verbose > 1) {
414 G4cout << "tcut(MeV)= " << tMin/MeV
415 << "; tMax(MeV)= " << tMax/MeV
416 << "; x1= " << x1
417 << "; x2= " << x2
418 << "; a1= " << a1
419 << "; a2= " << a2
420 << "; x= " << x
421 << "; be= " << bindingEnergy
422 << "; e= " << e
423 << "; tDelta= " << tDelta
424 << G4endl;
425 }
426
427
428 return tDelta;
429}
430
431
432G4double G4eIonisationSpectrum::IntSpectrum(G4double xMin,
433 G4double xMax,
434 const G4DataVector& p) const
435{
436 // Please comment what IntSpectrum does
437 G4double sum = 0.0;
438 if(xMin >= xMax) return sum;
439
440 G4double x1, x2, xs1, xs2, y1, y2, ys1, ys2, q;
441
442 // Integral over interpolation aria
443 if(xMin < p[3]) {
444
445 x1 = p[1];
446 y1 = p[4];
447
448 G4double dx = (p[2] - p[1]) / 3.0;
449 G4double dx1= G4Exp(std::log(p[3]/p[2]) / 16.0);
450
451 for (size_t i=0; i<19; i++) {
452
453 q = 0.0;
454 if (i < 3) {
455 x2 = x1 + dx;
456 } else if(18 == i) {
457 x2 = p[3];
458 } else {
459 x2 = x1*dx1;
460 }
461
462 y2 = p[5 + i];
463
464 if (xMax <= x1) {
465 break;
466 } else if (xMin < x2) {
467
468 xs1 = x1;
469 xs2 = x2;
470 ys1 = y1;
471 ys2 = y2;
472
473 if (x2 > x1) {
474 if (xMin > x1) {
475 xs1 = xMin;
476 ys1 += (xs1 - x1)*(y2 - y1)/(x2 - x1);
477 }
478 if (xMax < x2) {
479 xs2 = xMax;
480 ys2 += (xs2 - x2)*(y1 - y2)/(x1 - x2);
481 }
482 if (xs2 > xs1) {
483 q = (ys1*xs2 - ys2*xs1)/(xs1*xs2)
484 + std::log(xs2/xs1)*(ys2 - ys1)/(xs2 - xs1);
485 sum += q;
486 if(p.size() == 26) G4cout << "i= " << i << " q= " << q << " sum= " << sum << G4endl;
487 }
488 }
489 }
490 x1 = x2;
491 y1 = y2;
492 }
493 }
494
495 // Integral over aria with parametrised formula
496
497 x1 = std::max(xMin, p[3]);
498 if(x1 >= xMax) return sum;
499 x2 = xMax;
500
501 xs1 = 1./x1;
502 xs2 = 1./x2;
503 q = (xs1 - xs2)*(1.0 - p[0])
504 - p[iMax]*std::log(x2/x1)
505 + (1. - p[iMax])*(x2 - x1)
506 + 1./(1. - x2) - 1./(1. - x1)
507 + p[iMax]*std::log((1. - x2)/(1. - x1))
508 + 0.25*p[0]*(xs1*xs1 - xs2*xs2);
509 sum += q;
510 if(p.size() == 26) G4cout << "param... q= " << q << " sum= " << sum << G4endl;
511
512 return sum;
513}
514
515
516G4double G4eIonisationSpectrum::AverageValue(G4double xMin,
517 G4double xMax,
518 const G4DataVector& p) const
519{
520 G4double sum = 0.0;
521 if(xMin >= xMax) return sum;
522
523 G4double x1, x2, xs1, xs2, y1, y2, ys1, ys2;
524
525 // Integral over interpolation aria
526 if(xMin < p[3]) {
527
528 x1 = p[1];
529 y1 = p[4];
530
531 G4double dx = (p[2] - p[1]) / 3.0;
532 G4double dx1= G4Exp(std::log(p[3]/p[2]) / 16.0);
533
534 for (size_t i=0; i<19; i++) {
535
536 if (i < 3) {
537 x2 = x1 + dx;
538 } else if(18 == i) {
539 x2 = p[3];
540 } else {
541 x2 = x1*dx1;
542 }
543
544 y2 = p[5 + i];
545
546 if (xMax <= x1) {
547 break;
548 } else if (xMin < x2) {
549
550 xs1 = x1;
551 xs2 = x2;
552 ys1 = y1;
553 ys2 = y2;
554
555 if (x2 > x1) {
556 if (xMin > x1) {
557 xs1 = xMin;
558 ys1 += (xs1 - x1)*(y2 - y1)/(x2 - x1);
559 }
560 if (xMax < x2) {
561 xs2 = xMax;
562 ys2 += (xs2 - x2)*(y1 - y2)/(x1 - x2);
563 }
564 if (xs2 > xs1) {
565 sum += std::log(xs2/xs1)*(ys1*xs2 - ys2*xs1)/(xs2 - xs1)
566 + ys2 - ys1;
567 }
568 }
569 }
570 x1 = x2;
571 y1 = y2;
572
573 }
574 }
575
576 // Integral over aria with parametrised formula
577
578 x1 = std::max(xMin, p[3]);
579 if(x1 >= xMax) return sum;
580 x2 = xMax;
581
582 xs1 = 1./x1;
583 xs2 = 1./x2;
584
585 sum += std::log(x2/x1)*(1.0 - p[0])
586 + 0.5*(1. - p[iMax])*(x2*x2 - x1*x1)
587 + 1./(1. - x2) - 1./(1. - x1)
588 + (1. + p[iMax])*std::log((1. - x2)/(1. - x1))
589 + 0.5*p[0]*(xs1 - xs2);
590
591 return sum;
592}
593
594
595void G4eIonisationSpectrum::PrintData() const
596{
597 theParam->PrintData();
598}
599
600G4double G4eIonisationSpectrum::MaxEnergyOfSecondaries(G4double kineticEnergy,
601 G4int, // Z = 0,
602 const G4ParticleDefinition* ) const
603{
604 return 0.5 * kineticEnergy;
605}
G4Exp
G4double G4Exp(G4double initial_x)
Exponential Function double precision.
Definition: G4Exp.hh:179
G4double
double G4double
Definition: G4Types.hh:83
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
G4AtomicTransitionManager::Instance
static G4AtomicTransitionManager * Instance()
Definition: G4AtomicTransitionManager.cc:44
G4eIonisationParameters::Parameter
G4double Parameter(G4int Z, G4int shellIndex, G4int parameterIndex, G4double e) const
Definition: G4eIonisationParameters.cc:91
G4eIonisationSpectrum::AverageEnergy
G4double AverageEnergy(G4int Z, G4double tMin, G4double tMax, G4double kineticEnergy, G4int shell, const G4ParticleDefinition *pd=0) const
Definition: G4eIonisationSpectrum.cc:172
G4eIonisationSpectrum::SampleEnergy
G4double SampleEnergy(G4int Z, G4double tMin, G4double tMax, G4double kineticEnergy, G4int shell, const G4ParticleDefinition *pd=0) const
Definition: G4eIonisationSpectrum.cc:264
G4eIonisationSpectrum::MaxEnergyOfSecondaries
G4double MaxEnergyOfSecondaries(G4double kineticEnergy, G4int Z=0, const G4ParticleDefinition *pd=0) const
Definition: G4eIonisationSpectrum.cc:600
G4eIonisationSpectrum::Probability
G4double Probability(G4int Z, G4double tMin, G4double tMax, G4double kineticEnergy, G4int shell, const G4ParticleDefinition *pd=0) const
Definition: G4eIonisationSpectrum.cc:77