Geant4 9.6.0
Toolkit for the simulation of the passage of particles through matter
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Public Member Functions | List of all members
G4eIonisationSpectrum Class Reference

#include <G4eIonisationSpectrum.hh>

+ Inheritance diagram for G4eIonisationSpectrum:

Public Member Functions

 G4eIonisationSpectrum ()
 
 ~G4eIonisationSpectrum ()
 
G4double Probability (G4int Z, G4double tMin, G4double tMax, G4double kineticEnergy, G4int shell, const G4ParticleDefinition *pd=0) const
 
G4double AverageEnergy (G4int Z, G4double tMin, G4double tMax, G4double kineticEnergy, G4int shell, const G4ParticleDefinition *pd=0) const
 
G4double SampleEnergy (G4int Z, G4double tMin, G4double tMax, G4double kineticEnergy, G4int shell, const G4ParticleDefinition *pd=0) const
 
G4double MaxEnergyOfSecondaries (G4double kineticEnergy, G4int Z=0, const G4ParticleDefinition *pd=0) const
 
G4double Excitation (G4int Z, G4double e) const
 
void PrintData () const
 
- Public Member Functions inherited from G4VEnergySpectrum
 G4VEnergySpectrum ()
 
virtual ~G4VEnergySpectrum ()
 
virtual G4double Probability (G4int Z, G4double minKineticEnergy, G4double maxKineticEnergy, G4double kineticEnergy, G4int shell=0, const G4ParticleDefinition *pd=0) const =0
 
virtual G4double AverageEnergy (G4int Z, G4double minKineticEnergy, G4double maxKineticEnergy, G4double kineticEnergy, G4int shell=0, const G4ParticleDefinition *pd=0) const =0
 
virtual G4double SampleEnergy (G4int Z, G4double minKineticEnergy, G4double maxKineticEnergy, G4double kineticEnergy, G4int shell=0, const G4ParticleDefinition *pd=0) const =0
 
virtual G4double MaxEnergyOfSecondaries (G4double kineticEnergy, G4int Z=0, const G4ParticleDefinition *pd=0) const =0
 
virtual G4double Excitation (G4int Z, G4double kineticEnergy) const =0
 
virtual void PrintData () const =0
 

Detailed Description

Definition at line 64 of file G4eIonisationSpectrum.hh.

Constructor & Destructor Documentation

◆ G4eIonisationSpectrum()

G4eIonisationSpectrum::G4eIonisationSpectrum ( )

Definition at line 62 of file G4eIonisationSpectrum.cc.

62 :G4VEnergySpectrum(),
63 lowestE(0.1*eV),
64 factor(1.3),
65 iMax(24),
66 verbose(0)
67{
68 theParam = new G4eIonisationParameters();
69}

◆ ~G4eIonisationSpectrum()

G4eIonisationSpectrum::~G4eIonisationSpectrum ( )

Definition at line 72 of file G4eIonisationSpectrum.cc.

73{
74 delete theParam;
75}

Member Function Documentation

◆ AverageEnergy()

G4double G4eIonisationSpectrum::AverageEnergy ( G4int  Z,
G4double  tMin,
G4double  tMax,
G4double  kineticEnergy,
G4int  shell,
const G4ParticleDefinition *  pd = 0 
) const
virtual

Implements G4VEnergySpectrum.

Definition at line 173 of file G4eIonisationSpectrum.cc.

179{
180 // Please comment what AverageEnergy does and what are the three
181 // functions mentioned below
182 // Describe the algorithms used
183
184 G4double eMax = MaxEnergyOfSecondaries(e);
185 G4double t0 = std::max(tMin, lowestE);
186 G4double tm = std::min(tMax, eMax);
187 if(t0 >= tm) return 0.0;
188
189 G4double bindingEnergy = (G4AtomicTransitionManager::Instance())->
190 Shell(Z, shell)->BindingEnergy();
191
192 if(e <= bindingEnergy) return 0.0;
193
194 G4double energy = e + bindingEnergy;
195
196 G4double x1 = std::min(0.5,(t0 + bindingEnergy)/energy);
197 G4double x2 = std::min(0.5,(tm + bindingEnergy)/energy);
198
199 if(verbose > 1) {
200 G4cout << "G4eIonisationSpectrum::AverageEnergy: Z= " << Z
201 << "; shell= " << shell
202 << "; E(keV)= " << e/keV
203 << "; bindingE(keV)= " << bindingEnergy/keV
204 << "; x1= " << x1
205 << "; x2= " << x2
206 << G4endl;
207 }
208
209 G4DataVector p;
210
211 // Access parameters
212 for (G4int i=0; i<iMax; i++)
213 {
214 G4double x = theParam->Parameter(Z, shell, i, e);
215 if(i<4) x /= energy;
216 p.push_back(x);
217 }
218
219 if(p[3] > 0.5) p[3] = 0.5;
220
221 G4double gLocal2 = energy/electron_mass_c2 + 1.;
222 p.push_back((2.0*gLocal2 - 1.0)/(gLocal2*gLocal2));
223
224
225 //Add protection against division by zero: actually in Function()
226 //parameter p[3] appears in the denominator. Bug report 1042
227 if (p[3] > 0)
228 p[iMax-1] = Function(p[3], p);
229 else
230 {
231 G4cout << "WARNING: G4eIonisationSpectrum::AverageEnergy "
232 << "parameter p[3] <= 0. G4LEDATA dabatase might be corrupted for Z = "
233 << Z << ". Please check and/or update it " << G4endl;
234 }
235
236 G4double val = AverageValue(x1, x2, p);
237 G4double x0 = (lowestE + bindingEnergy)/energy;
238 G4double nor = IntSpectrum(x0, 0.5, p);
239 val *= energy;
240
241 if(verbose > 1) {
242 G4cout << "tcut(MeV)= " << tMin/MeV
243 << "; tMax(MeV)= " << tMax/MeV
244 << "; x0= " << x0
245 << "; x1= " << x1
246 << "; x2= " << x2
247 << "; val= " << val
248 << "; nor= " << nor
249 << "; sum= " << p[0]
250 << "; a= " << p[1]
251 << "; b= " << p[2]
252 << "; c= " << p[3]
253 << G4endl;
254 }
255
256 p.clear();
257
258 if(nor > 0.0) val /= nor;
259 else val = 0.0;
260
261 return val;
262}
G4double
double G4double
Definition: G4Types.hh:64
G4int
int G4int
Definition: G4Types.hh:66
G4endl
#define G4endl
Definition: G4ios.hh:52
G4cout
G4DLLIMPORT std::ostream G4cout
G4AtomicTransitionManager::Instance
static G4AtomicTransitionManager * Instance()
Definition: G4AtomicTransitionManager.cc:163
G4eIonisationParameters::Parameter
G4double Parameter(G4int Z, G4int shellIndex, G4int parameterIndex, G4double e) const
Definition: G4eIonisationParameters.cc:92
G4eIonisationSpectrum::MaxEnergyOfSecondaries
G4double MaxEnergyOfSecondaries(G4double kineticEnergy, G4int Z=0, const G4ParticleDefinition *pd=0) const
Definition: G4eIonisationSpectrum.cc:601
G4InuclSpecialFunctions::bindingEnergy
G4double bindingEnergy(G4int A, G4int Z)
Definition: bindingEnergy.cc:37

◆ Excitation()

G4double G4eIonisationSpectrum::Excitation ( G4int  Z,
G4double  e 
) const
inlinevirtual

Implements G4VEnergySpectrum.

Definition at line 129 of file G4eIonisationSpectrum.hh.

130{
131 return theParam->Excitation(Z, e);
132}
G4eIonisationParameters::Excitation
G4double Excitation(G4int Z, G4double e) const
Definition: G4eIonisationParameters.cc:125

◆ MaxEnergyOfSecondaries()

G4double G4eIonisationSpectrum::MaxEnergyOfSecondaries ( G4double  kineticEnergy,
G4int  Z = 0,
const G4ParticleDefinition *  pd = 0 
) const
virtual

Implements G4VEnergySpectrum.

Definition at line 601 of file G4eIonisationSpectrum.cc.

604{
605 return 0.5 * kineticEnergy;
606}

Referenced by AverageEnergy(), Probability(), and SampleEnergy().

◆ PrintData()

void G4eIonisationSpectrum::PrintData ( ) const
virtual

Implements G4VEnergySpectrum.

Definition at line 596 of file G4eIonisationSpectrum.cc.

597{
598 theParam->PrintData();
599}

◆ Probability()

G4double G4eIonisationSpectrum::Probability ( G4int  Z,
G4double  tMin,
G4double  tMax,
G4double  kineticEnergy,
G4int  shell,
const G4ParticleDefinition *  pd = 0 
) const
virtual

Implements G4VEnergySpectrum.

Definition at line 78 of file G4eIonisationSpectrum.cc.

84{
85 // Please comment what Probability does and what are the three
86 // functions mentioned below
87 // Describe the algorithms used
88
89 G4double eMax = MaxEnergyOfSecondaries(e);
90 G4double t0 = std::max(tMin, lowestE);
91 G4double tm = std::min(tMax, eMax);
92 if(t0 >= tm) return 0.0;
93
94 G4double bindingEnergy = (G4AtomicTransitionManager::Instance())->
95 Shell(Z, shell)->BindingEnergy();
96
97 if(e <= bindingEnergy) return 0.0;
98
99 G4double energy = e + bindingEnergy;
100
101 G4double x1 = std::min(0.5,(t0 + bindingEnergy)/energy);
102 G4double x2 = std::min(0.5,(tm + bindingEnergy)/energy);
103
104 if(verbose > 1 || (Z==4 && e>= 1.0 && e<= 0.0)) {
105 G4cout << "G4eIonisationSpectrum::Probability: Z= " << Z
106 << "; shell= " << shell
107 << "; E(keV)= " << e/keV
108 << "; Eb(keV)= " << bindingEnergy/keV
109 << "; x1= " << x1
110 << "; x2= " << x2
111 << G4endl;
112
113 }
114
115 G4DataVector p;
116
117 // Access parameters
118 for (G4int i=0; i<iMax; i++)
119 {
120 G4double x = theParam->Parameter(Z, shell, i, e);
121 if(i<4) x /= energy;
122 p.push_back(x);
123 }
124
125 if(p[3] > 0.5) p[3] = 0.5;
126
127 G4double gLocal = energy/electron_mass_c2 + 1.;
128 p.push_back((2.0*gLocal - 1.0)/(gLocal*gLocal));
129
130 //Add protection against division by zero: actually in Function()
131 //parameter p[3] appears in the denominator. Bug report 1042
132 if (p[3] > 0)
133 p[iMax-1] = Function(p[3], p);
134 else
135 {
136 G4cout << "WARNING: G4eIonisationSpectrum::Probability "
137 << "parameter p[3] <= 0. G4LEDATA dabatase might be corrupted for Z = "
138 << Z << ". Please check and/or update it " << G4endl;
139 }
140
141 if(e >= 1. && e <= 0. && Z == 4) p.push_back(0.0);
142
143
144 G4double val = IntSpectrum(x1, x2, p);
145 G4double x0 = (lowestE + bindingEnergy)/energy;
146 G4double nor = IntSpectrum(x0, 0.5, p);
147
148 if(verbose > 1 || (Z==4 && e>= 1.0 && e<= 0.0)) {
149 G4cout << "tcut= " << tMin
150 << "; tMax= " << tMax
151 << "; x0= " << x0
152 << "; x1= " << x1
153 << "; x2= " << x2
154 << "; val= " << val
155 << "; nor= " << nor
156 << "; sum= " << p[0]
157 << "; a= " << p[1]
158 << "; b= " << p[2]
159 << "; c= " << p[3]
160 << G4endl;
161 if(shell == 1) G4cout << "============" << G4endl;
162 }
163
164 p.clear();
165
166 if(nor > 0.0) val /= nor;
167 else val = 0.0;
168
169 return val;
170}

◆ SampleEnergy()

G4double G4eIonisationSpectrum::SampleEnergy ( G4int  Z,
G4double  tMin,
G4double  tMax,
G4double  kineticEnergy,
G4int  shell,
const G4ParticleDefinition *  pd = 0 
) const
virtual

Implements G4VEnergySpectrum.

Definition at line 265 of file G4eIonisationSpectrum.cc.

271{
272 // Please comment what SampleEnergy does
273 G4double tDelta = 0.0;
274 G4double t0 = std::max(tMin, lowestE);
275 G4double tm = std::min(tMax, MaxEnergyOfSecondaries(e));
276 if(t0 > tm) return tDelta;
277
278 G4double bindingEnergy = (G4AtomicTransitionManager::Instance())->
279 Shell(Z, shell)->BindingEnergy();
280
281 if(e <= bindingEnergy) return 0.0;
282
283 G4double energy = e + bindingEnergy;
284
285 G4double x1 = std::min(0.5,(t0 + bindingEnergy)/energy);
286 G4double x2 = std::min(0.5,(tm + bindingEnergy)/energy);
287 if(x1 >= x2) return tDelta;
288
289 if(verbose > 1) {
290 G4cout << "G4eIonisationSpectrum::SampleEnergy: Z= " << Z
291 << "; shell= " << shell
292 << "; E(keV)= " << e/keV
293 << G4endl;
294 }
295
296 // Access parameters
297 G4DataVector p;
298
299 // Access parameters
300 for (G4int i=0; i<iMax; i++)
301 {
302 G4double x = theParam->Parameter(Z, shell, i, e);
303 if(i<4) x /= energy;
304 p.push_back(x);
305 }
306
307 if(p[3] > 0.5) p[3] = 0.5;
308
309 G4double gLocal3 = energy/electron_mass_c2 + 1.;
310 p.push_back((2.0*gLocal3 - 1.0)/(gLocal3*gLocal3));
311
312
313 //Add protection against division by zero: actually in Function()
314 //parameter p[3] appears in the denominator. Bug report 1042
315 if (p[3] > 0)
316 p[iMax-1] = Function(p[3], p);
317 else
318 {
319 G4cout << "WARNING: G4eIonisationSpectrum::SampleSpectrum "
320 << "parameter p[3] <= 0. G4LEDATA dabatase might be corrupted for Z = "
321 << Z << ". Please check and/or update it " << G4endl;
322 }
323
324 G4double aria1 = 0.0;
325 G4double a1 = std::max(x1,p[1]);
326 G4double a2 = std::min(x2,p[3]);
327 if(a1 < a2) aria1 = IntSpectrum(a1, a2, p);
328 G4double aria2 = 0.0;
329 G4double a3 = std::max(x1,p[3]);
330 G4double a4 = x2;
331 if(a3 < a4) aria2 = IntSpectrum(a3, a4, p);
332
333 G4double aria = (aria1 + aria2)*G4UniformRand();
334 G4double amaj, fun, q, x, z1, z2, dx, dx1;
335
336 //======= First aria to sample =====
337
338 if(aria <= aria1) {
339
340 amaj = p[4];
341 for (G4int j=5; j<iMax; j++) {
342 if(p[j] > amaj) amaj = p[j];
343 }
344
345 a1 = 1./a1;
346 a2 = 1./a2;
347
348 G4int i;
349 do {
350
351 x = 1./(a2 + G4UniformRand()*(a1 - a2));
352 z1 = p[1];
353 z2 = p[3];
354 dx = (p[2] - p[1]) / 3.0;
355 dx1= std::exp(std::log(p[3]/p[2]) / 16.0);
356 for (i=4; i<iMax-1; i++) {
357
358 if (i < 7) {
359 z2 = z1 + dx;
360 } else if(iMax-2 == i) {
361 z2 = p[3];
362 break;
363 } else {
364 z2 = z1*dx1;
365 }
366 if(x >= z1 && x <= z2) break;
367 z1 = z2;
368 }
369 fun = p[i] + (x - z1) * (p[i+1] - p[i])/(z2 - z1);
370
371 if(fun > amaj) {
372 G4cout << "WARNING in G4eIonisationSpectrum::SampleEnergy:"
373 << " Majoranta " << amaj
374 << " < " << fun
375 << " in the first aria at x= " << x
376 << G4endl;
377 }
378
379 q = amaj*G4UniformRand();
380
381 } while (q >= fun);
382
383 //======= Second aria to sample =====
384
385 } else {
386
387 amaj = std::max(p[iMax-1], Function(0.5, p)) * factor;
388 a1 = 1./a3;
389 a2 = 1./a4;
390
391 do {
392
393 x = 1./(a2 + G4UniformRand()*(a1 - a2));
394 fun = Function(x, p);
395
396 if(fun > amaj) {
397 G4cout << "WARNING in G4eIonisationSpectrum::SampleEnergy:"
398 << " Majoranta " << amaj
399 << " < " << fun
400 << " in the second aria at x= " << x
401 << G4endl;
402 }
403
404 q = amaj*G4UniformRand();
405
406 } while (q >= fun);
407
408 }
409
410 p.clear();
411
412 tDelta = x*energy - bindingEnergy;
413
414 if(verbose > 1) {
415 G4cout << "tcut(MeV)= " << tMin/MeV
416 << "; tMax(MeV)= " << tMax/MeV
417 << "; x1= " << x1
418 << "; x2= " << x2
419 << "; a1= " << a1
420 << "; a2= " << a2
421 << "; x= " << x
422 << "; be= " << bindingEnergy
423 << "; e= " << e
424 << "; tDelta= " << tDelta
425 << G4endl;
426 }
427
428
429 return tDelta;
430}
G4UniformRand
#define G4UniformRand()
Definition: Randomize.hh:53
The documentation for this class was generated from the following files: