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G4UrbanMscModel Class Reference
#include <G4UrbanMscModel.hh>
Inheritance diagram for G4UrbanMscModel:
Detailed Description
Definition at line 69 of file G4UrbanMscModel.hh.
Constructor & Destructor Documentation
◆ G4UrbanMscModel() [1/2]
|
explicit |
Definition at line 80 of file G4UrbanMscModel.cc.
81 : G4VMscModel(nam)
82{
83 masslimite = 0.6*CLHEP::MeV;
84 fr = 0.02;
85 taubig = 8.0;
86 tausmall = 1.e-16;
87 taulim = 1.e-6;
88 currentTau = taulim;
89 tlimitminfix = 0.01*CLHEP::nm;
90 tlimitminfix2 = 1.*CLHEP::nm;
91 stepmin = tlimitminfix;
92 smallstep = 1.e10;
93 currentRange = 0.;
94 rangeinit = 0.;
95 tlimit = 1.e10*CLHEP::mm;
96 tlimitmin = 10.*tlimitminfix;
97 tgeom = 1.e50*CLHEP::mm;
98 geombig = tgeom;
99 geommin = 1.e-6*CLHEP::mm;
100 geomlimit = geombig;
101 presafety = 0.;
102
103 positron = G4Positron::Positron();
104 rndmEngineMod = G4Random::getTheEngine();
105
106 drr = 0.35;
107 finalr = 10.*CLHEP::um;
108
109 tlow = 5.*CLHEP::keV;
110 invmev = 1.0/CLHEP::MeV;
111
112 skindepth = skin*stepmin;
113
114 mass = CLHEP::proton_mass_c2;
115 charge = chargeSquare = 1.0;
116 currentKinEnergy = currentRadLength = lambda0 = lambdaeff = tPathLength
117 = zPathLength = par1 = par2 = par3 = rndmarray[0] = rndmarray[1] = 0;
118 currentLogKinEnergy = LOG_EKIN_MIN;
119}
Referenced by G4UrbanMscModel(), and operator=().
◆ ~G4UrbanMscModel()
|
override |
Definition at line 123 of file G4UrbanMscModel.cc.
124{
125 if(isFirstInstance) {
126 for(auto const & ptr : msc) { delete ptr; }
127 msc.clear();
128 }
129}
◆ G4UrbanMscModel() [2/2]
|
delete |
Member Function Documentation
◆ ComputeCrossSectionPerAtom()
|
overridevirtual |
Reimplemented from G4VEmModel.
Definition at line 172 of file G4UrbanMscModel.cc.
177{
179
181 50., 56., 64., 74., 79., 82. };
182
183 // corr. factors for e-/e+ lambda for T <= Tlim
185 {{1.125,1.072,1.051,1.047,1.047,1.050,1.052,1.054,
186 1.054,1.057,1.062,1.069,1.075,1.090,1.105,1.111,
187 1.112,1.108,1.100,1.093,1.089,1.087 },
188 {1.408,1.246,1.143,1.096,1.077,1.059,1.053,1.051,
189 1.052,1.053,1.058,1.065,1.072,1.087,1.101,1.108,
190 1.109,1.105,1.097,1.090,1.086,1.082 },
191 {2.833,2.268,1.861,1.612,1.486,1.309,1.204,1.156,
192 1.136,1.114,1.106,1.106,1.109,1.119,1.129,1.132,
193 1.131,1.124,1.113,1.104,1.099,1.098 },
194 {3.879,3.016,2.380,2.007,1.818,1.535,1.340,1.236,
195 1.190,1.133,1.107,1.099,1.098,1.103,1.110,1.113,
196 1.112,1.105,1.096,1.089,1.085,1.098 },
197 {6.937,4.330,2.886,2.256,1.987,1.628,1.395,1.265,
198 1.203,1.122,1.080,1.065,1.061,1.063,1.070,1.073,
199 1.073,1.070,1.064,1.059,1.056,1.056 },
200 {9.616,5.708,3.424,2.551,2.204,1.762,1.485,1.330,
201 1.256,1.155,1.099,1.077,1.070,1.068,1.072,1.074,
202 1.074,1.070,1.063,1.059,1.056,1.052 },
203 {11.72,6.364,3.811,2.806,2.401,1.884,1.564,1.386,
204 1.300,1.180,1.112,1.082,1.073,1.066,1.068,1.069,
205 1.068,1.064,1.059,1.054,1.051,1.050 },
206 {18.08,8.601,4.569,3.183,2.662,2.025,1.646,1.439,
207 1.339,1.195,1.108,1.068,1.053,1.040,1.039,1.039,
208 1.039,1.037,1.034,1.031,1.030,1.036 },
209 {18.22,10.48,5.333,3.713,3.115,2.367,1.898,1.631,
210 1.498,1.301,1.171,1.105,1.077,1.048,1.036,1.033,
211 1.031,1.028,1.024,1.022,1.021,1.024 },
212 {14.14,10.65,5.710,3.929,3.266,2.453,1.951,1.669,
213 1.528,1.319,1.178,1.106,1.075,1.040,1.027,1.022,
214 1.020,1.017,1.015,1.013,1.013,1.020 },
215 {14.11,11.73,6.312,4.240,3.478,2.566,2.022,1.720,
216 1.569,1.342,1.186,1.102,1.065,1.022,1.003,0.997,
217 0.995,0.993,0.993,0.993,0.993,1.011 },
218 {22.76,20.01,8.835,5.287,4.144,2.901,2.219,1.855,
219 1.677,1.410,1.224,1.121,1.073,1.014,0.986,0.976,
220 0.974,0.972,0.973,0.974,0.975,0.987 },
221 {50.77,40.85,14.13,7.184,5.284,3.435,2.520,2.059,
222 1.837,1.512,1.283,1.153,1.091,1.010,0.969,0.954,
223 0.950,0.947,0.949,0.952,0.954,0.963 },
224 {65.87,59.06,15.87,7.570,5.567,3.650,2.682,2.182,
225 1.939,1.579,1.325,1.178,1.108,1.014,0.965,0.947,
226 0.941,0.938,0.940,0.944,0.946,0.954 },
227 {55.60,47.34,15.92,7.810,5.755,3.767,2.760,2.239,
228 1.985,1.609,1.343,1.188,1.113,1.013,0.960,0.939,
229 0.933,0.930,0.933,0.936,0.939,0.949 }};
230
232 {2.589,2.044,1.658,1.446,1.347,1.217,1.144,1.110,
233 1.097,1.083,1.080,1.086,1.092,1.108,1.123,1.131,
234 1.131,1.126,1.117,1.108,1.103,1.100 },
235 {3.904,2.794,2.079,1.710,1.543,1.325,1.202,1.145,
236 1.122,1.096,1.089,1.092,1.098,1.114,1.130,1.137,
237 1.138,1.132,1.122,1.113,1.108,1.102 },
238 {7.970,6.080,4.442,3.398,2.872,2.127,1.672,1.451,
239 1.357,1.246,1.194,1.179,1.178,1.188,1.201,1.205,
240 1.203,1.190,1.173,1.159,1.151,1.145 },
241 {9.714,7.607,5.747,4.493,3.815,2.777,2.079,1.715,
242 1.553,1.353,1.253,1.219,1.211,1.214,1.225,1.228,
243 1.225,1.210,1.191,1.175,1.166,1.174 },
244 {17.97,12.95,8.628,6.065,4.849,3.222,2.275,1.820,
245 1.624,1.382,1.259,1.214,1.202,1.202,1.214,1.219,
246 1.217,1.203,1.184,1.169,1.160,1.151 },
247 {24.83,17.06,10.84,7.355,5.767,3.707,2.546,1.996,
248 1.759,1.465,1.311,1.252,1.234,1.228,1.238,1.241,
249 1.237,1.222,1.201,1.184,1.174,1.159 },
250 {23.26,17.15,11.52,8.049,6.375,4.114,2.792,2.155,
251 1.880,1.535,1.353,1.281,1.258,1.247,1.254,1.256,
252 1.252,1.234,1.212,1.194,1.183,1.170 },
253 {22.33,18.01,12.86,9.212,7.336,4.702,3.117,2.348,
254 2.015,1.602,1.385,1.297,1.268,1.251,1.256,1.258,
255 1.254,1.237,1.214,1.195,1.185,1.179 },
256 {33.91,24.13,15.71,10.80,8.507,5.467,3.692,2.808,
257 2.407,1.873,1.564,1.425,1.374,1.330,1.324,1.320,
258 1.312,1.288,1.258,1.235,1.221,1.205 },
259 {32.14,24.11,16.30,11.40,9.015,5.782,3.868,2.917,
260 2.490,1.925,1.596,1.447,1.391,1.342,1.332,1.327,
261 1.320,1.294,1.264,1.240,1.226,1.214 },
262 {29.51,24.07,17.19,12.28,9.766,6.238,4.112,3.066,
263 2.602,1.995,1.641,1.477,1.414,1.356,1.342,1.336,
264 1.328,1.302,1.270,1.245,1.231,1.233 },
265 {38.19,30.85,21.76,15.35,12.07,7.521,4.812,3.498,
266 2.926,2.188,1.763,1.563,1.484,1.405,1.382,1.371,
267 1.361,1.330,1.294,1.267,1.251,1.239 },
268 {49.71,39.80,27.96,19.63,15.36,9.407,5.863,4.155,
269 3.417,2.478,1.944,1.692,1.589,1.480,1.441,1.423,
270 1.409,1.372,1.330,1.298,1.280,1.258 },
271 {59.25,45.08,30.36,20.83,16.15,9.834,6.166,4.407,
272 3.641,2.648,2.064,1.779,1.661,1.531,1.482,1.459,
273 1.442,1.400,1.354,1.319,1.299,1.272 },
274 {56.38,44.29,30.50,21.18,16.51,10.11,6.354,4.542,
275 3.752,2.724,2.116,1.817,1.692,1.554,1.499,1.474,
276 1.456,1.412,1.364,1.328,1.307,1.282 }};
277
278 //data/corrections for T > Tlim
279
281 120.70, 117.50, 105.00, 92.92, 79.23, 74.510, 68.29,
282 57.39, 41.97, 36.14, 24.53, 10.21, -7.855, -16.84,
283 -22.30};
284
285 G4double sigma;
286 SetParticle(part);
287
289
290 // correction if particle .ne. e-/e+
291 // compute equivalent kinetic energy
292 // lambda depends on p*beta ....
293
294 G4double eKineticEnergy = kinEnergy;
295
296 if(mass > CLHEP::electron_mass_c2)
297 {
298 G4double TAU = kinEnergy/mass ;
299 G4double c = mass*TAU*(TAU+2.)/(CLHEP::electron_mass_c2*(TAU+1.)) ;
300 G4double w = c-2.;
301 G4double tau = 0.5*(w+std::sqrt(w*w+4.*c)) ;
302 eKineticEnergy = CLHEP::electron_mass_c2*tau ;
303 }
304
305 G4double eTotalEnergy = eKineticEnergy + CLHEP::electron_mass_c2 ;
306 G4double beta2 = eKineticEnergy*(eTotalEnergy+CLHEP::electron_mass_c2)
307 /(eTotalEnergy*eTotalEnergy);
308 G4double bg2 = eKineticEnergy*(eTotalEnergy+CLHEP::electron_mass_c2)
309 /(CLHEP::electron_mass_c2*CLHEP::electron_mass_c2);
310
312 CLHEP::electron_mass_c2*CLHEP::Bohr_radius*CLHEP::Bohr_radius
313 /(CLHEP::hbarc*CLHEP::hbarc);
314 G4double eps = epsfactor*bg2/Z23;
315
316 if (eps<epsmin) sigma = 2.*eps*eps;
319
320 sigma *= chargeSquare*atomicNumber*atomicNumber/(beta2*bg2);
321
322 // interpolate in AtomicNumber and beta2
323 G4double c1,c2,cc1;
324
325 // get bin number in Z
326 G4int iZ = 14;
327 // Loop checking, 03-Aug-2015, Vladimir Ivanchenko
328 while ((iZ>=0)&&(Zdat[iZ]>=atomicNumber)) { --iZ; }
329
330 iZ = std::min(std::max(iZ, 0), 13);
331
332 G4double ZZ1 = Zdat[iZ];
333 G4double ZZ2 = Zdat[iZ+1];
334 G4double ratZ = (atomicNumber-ZZ1)*(atomicNumber+ZZ1)/
335 ((ZZ2-ZZ1)*(ZZ2+ZZ1));
336
339 CLHEP::twopi*CLHEP::classic_electr_radius*CLHEP::classic_electr_radius;
341 ((Tlim+CLHEP::electron_mass_c2)*(Tlim+CLHEP::electron_mass_c2));
343 (CLHEP::electron_mass_c2*CLHEP::electron_mass_c2);
344
346 0.2672*CLHEP::barn, 0.5922*CLHEP::barn, 2.653*CLHEP::barn, 6.235*CLHEP::barn,
347 11.69*CLHEP::barn , 13.24*CLHEP::barn , 16.12*CLHEP::barn, 23.00*CLHEP::barn,
348 35.13*CLHEP::barn , 39.95*CLHEP::barn , 50.85*CLHEP::barn, 67.19*CLHEP::barn,
349 91.15*CLHEP::barn , 104.4*CLHEP::barn , 113.1*CLHEP::barn};
350
352 100*CLHEP::eV, 200*CLHEP::eV, 400*CLHEP::eV, 700*CLHEP::eV,
353 1*CLHEP::keV, 2*CLHEP::keV, 4*CLHEP::keV, 7*CLHEP::keV,
354 10*CLHEP::keV, 20*CLHEP::keV, 40*CLHEP::keV, 70*CLHEP::keV,
355 100*CLHEP::keV, 200*CLHEP::keV, 400*CLHEP::keV, 700*CLHEP::keV,
356 1*CLHEP::MeV, 2*CLHEP::MeV, 4*CLHEP::MeV, 7*CLHEP::MeV,
357 10*CLHEP::MeV, 20*CLHEP::MeV};
358
359 if(eKineticEnergy <= Tlim)
360 {
361 // get bin number in T (beta2)
362 G4int iT = 21;
363 // Loop checking, 03-Aug-2015, Vladimir Ivanchenko
364 while ((iT>=0)&&(Tdat[iT]>=eKineticEnergy)) iT -= 1;
365
366 iT = std::min(std::max(iT, 0), 20);
367
368 // calculate betasquare values
369 G4double T = Tdat[iT];
370 G4double E = T + CLHEP::electron_mass_c2;
371 G4double b2small = T*(E+CLHEP::electron_mass_c2)/(E*E);
372
373 T = Tdat[iT+1];
374 E = T + CLHEP::electron_mass_c2;
375 G4double b2big = T*(E+CLHEP::electron_mass_c2)/(E*E);
376 G4double ratb2 = (beta2-b2small)/(b2big-b2small);
377
378 if (charge < 0.)
379 {
380 c1 = celectron[iZ][iT];
381 c2 = celectron[iZ+1][iT];
382 cc1 = c1+ratZ*(c2-c1);
383
384 c1 = celectron[iZ][iT+1];
385 c2 = celectron[iZ+1][iT+1];
386 }
387 else
388 {
389 c1 = cpositron[iZ][iT];
390 c2 = cpositron[iZ+1][iT];
391 cc1 = c1+ratZ*(c2-c1);
392
393 c1 = cpositron[iZ][iT+1];
394 c2 = cpositron[iZ+1][iT+1];
395 }
396 G4double cc2 = c1+ratZ*(c2-c1);
397 sigma *= sigmafactor/(cc1+ratb2*(cc2-cc1));
398 }
399 else
400 {
401 c1 = bg2lim*sig0[iZ]*(1.+hecorr[iZ]*(beta2-beta2lim))/bg2;
402 c2 = bg2lim*sig0[iZ+1]*(1.+hecorr[iZ+1]*(beta2-beta2lim))/bg2;
403 if((atomicNumber >= ZZ1) && (atomicNumber <= ZZ2))
404 sigma = c1+ratZ*(c2-c1) ;
405 else if(atomicNumber < ZZ1)
406 sigma = atomicNumber*atomicNumber*c1/(ZZ1*ZZ1);
407 else if(atomicNumber > ZZ2)
408 sigma = atomicNumber*atomicNumber*c2/(ZZ2*ZZ2);
409 }
410 // low energy correction based on theory
411 sigma *= (1.+0.30/(1.+std::sqrt(1000.*eKineticEnergy)));
412
413 return sigma;
414}
◆ ComputeGeomPathLength()
Implements G4VMscModel.
Definition at line 681 of file G4UrbanMscModel.cc.
682{
683 lambdaeff = lambda0;
684 par1 = -1. ;
685 par2 = par3 = 0. ;
686
687 // this correction needed to run MSC with eIoni and eBrem inactivated
688 // and makes no harm for a normal run
689 tPathLength = std::min(tPathLength,currentRange);
690
691 // do the true -> geom transformation
692 zPathLength = tPathLength;
693
694 // z = t for very small tPathLength
695 if(tPathLength < tlimitminfix2) return zPathLength;
696
697 /*
698 G4cout << "ComputeGeomPathLength: tpl= " << tPathLength
699 << " R= " << currentRange << " L0= " << lambda0
700 << " E= " << currentKinEnergy << " "
701 << particle->GetParticleName() << G4endl;
702 */
703 G4double tau = tPathLength/lambda0 ;
704
705 if ((tau <= tausmall) || insideskin) {
706 zPathLength = std::min(tPathLength, lambda0);
707
709 zPathLength = (tau < taulim) ? tPathLength*(1.-0.5*tau)
710 : lambda0*(1.-G4Exp(-tau));
711
712 } else if(currentKinEnergy < mass || tPathLength == currentRange) {
713 par1 = 1./currentRange;
714 par2 = currentRange/lambda0;
715 par3 = 1.+par2;
716 if(tPathLength < currentRange) {
717 zPathLength =
719 } else {
720 zPathLength = 1./(par1*par3);
721 }
722
723 } else {
724 G4double rfin = std::max(currentRange-tPathLength, 0.01*currentRange);
727
728 par1 = (lambda0-lambda1)/(lambda0*tPathLength);
729 //G4cout << "par1= " << par1 << " L1= " << lambda1 << G4endl;
730 par2 = 1./(par1*lambda0);
731 par3 = 1.+par2;
733 }
734
735 zPathLength = std::min(zPathLength, lambda0);
736 //G4cout<< "zPathLength= "<< zPathLength<< " L0= " << lambda0 << G4endl;
737 return zPathLength;
738}
G4double GetTransportMeanFreePath(const G4ParticleDefinition *part, G4double kinEnergy)
Definition G4VMscModel.hh:325
G4double GetEnergy(const G4ParticleDefinition *part, G4double range, const G4MaterialCutsCouple *couple)
Definition G4VMscModel.cc:204
◆ ComputeTheta0()
Definition at line 982 of file G4UrbanMscModel.cc.
984{
985 // for all particles take the width of the central part
986 // from a parametrization similar to the Highland formula
987 // ( Highland formula: Particle Physics Booklet, July 2002, eq. 26.10)
988 G4double invbetacp = (kinEnergy+mass)/(kinEnergy*(kinEnergy+2.*mass));
989 if(currentKinEnergy != kinEnergy) {
990 invbetacp = std::sqrt(invbetacp*(currentKinEnergy+mass)/
991 (currentKinEnergy*(currentKinEnergy+2.*mass)));
992 }
993 G4double y = trueStepLength/currentRadLength;
994
995 if(fPosiCorrection && particle == positron)
996 {
1000 G4double corr;
1001
1002 G4double tau = std::sqrt(currentKinEnergy*kinEnergy)/mass;
1003 G4double x = std::sqrt(tau*(tau+2.)/((tau+1.)*(tau+1.)));
1004 G4double a = msc[idx]->posa;
1005 G4double b = msc[idx]->posb;
1006 G4double c = msc[idx]->posc;
1007 G4double d = msc[idx]->posd;
1008 if(x < xl) {
1009 corr = a*(1.-G4Exp(-b*x));
1010 } else if(x > xh) {
1011 corr = c+d*G4Exp(e*(x-1.));
1012 } else {
1015 G4double y0 = (yh-yl)/(xh-xl);
1016 G4double y1 = yl-y0*xl;
1017 corr = y0*x+y1;
1018 }
1019 //==================================================================
1020 y *= corr*msc[idx]->pose;
1021 }
1022
1024 G4double theta0 = c_highland*std::abs(charge)*std::sqrt(y)*invbetacp;
1025
1026 // correction factor from e- scattering data
1027 theta0 *= (msc[idx]->coeffth1+msc[idx]->coeffth2*G4Log(y));
1028 return theta0;
1029}
◆ ComputeTruePathLengthLimit()
|
overridevirtual |
Implements G4VMscModel.
Definition at line 433 of file G4UrbanMscModel.cc.
436{
437 tPathLength = currentMinimalStep;
439
442 couple = track.GetMaterialCutsCouple();
443 SetCurrentCouple(couple);
444 idx = couple->GetIndex();
445 currentKinEnergy = dp->GetKineticEnergy();
446 currentLogKinEnergy = dp->GetLogKineticEnergy();
447 currentRange = GetRange(particle,currentKinEnergy,couple,currentLogKinEnergy);
448 lambda0 = GetTransportMeanFreePath(particle,currentKinEnergy,
449 currentLogKinEnergy);
450 tPathLength = std::min(tPathLength,currentRange);
451 /*
452 G4cout << "G4Urban::StepLimit tPathLength= " << tPathLength
453 << " range= " <<currentRange<< " lambda= "<<lambda0
454 <<G4endl;
455 */
456 // extreme small step
457 if(tPathLength < tlimitminfix) {
460 }
461
464
465 // stop here if small step or range is less than safety
466 if(tPathLength == currentRange && tPathLength < presafety) {
469 }
470
471 // upper limit for the straight line distance the particle can travel
472 // for electrons and positrons
473 G4double distance = (mass < masslimite)
474 ? currentRange*msc[idx]->doverra
475 // for muons, hadrons
476 : currentRange*msc[idx]->doverrb;
477
478 /*
479 G4cout << "G4Urban::StepLimit tPathLength= "
480 <<tPathLength<<" safety= " << presafety
481 << " range= " <<currentRange<< " lambda= "<<lambda0
482 << " Alg: " << steppingAlgorithm <<G4endl;
483 */
484 // far from geometry boundary
485 if(distance < presafety)
486 {
489 }
490
491 latDisplasment = latDisplasmentbackup;
492 // ----------------------------------------------------------------
493 // distance to boundary
495 {
496 //compute geomlimit and presafety
497 geomlimit = ComputeGeomLimit(track, presafety, currentRange);
498 /*
499 G4cout << "G4Urban::Distance to boundary geomlimit= "
500 <<geomlimit<<" safety= " << presafety<<G4endl;
501 */
502
503 smallstep += 1.;
504 insideskin = false;
505 tgeom = geombig;
506
507 // initialisation at first step and at the boundary
509 {
510 rangeinit = currentRange;
511 if(!firstStep) { smallstep = 1.; }
512
513 //stepmin ~ lambda_elastic
514 stepmin = ComputeStepmin();
515 skindepth = skin*stepmin;
516 tlimitmin = ComputeTlimitmin();
517 /*
518 G4cout << "rangeinit= " << rangeinit << " stepmin= " << stepmin
519 << " tlimitmin= " << tlimitmin << " geomlimit= "
520 << geomlimit <<G4endl;
521 */
522 }
523
524 // constraint from the geometry
525 // tgeom is upper limit for the step size
526 if((geomlimit < geombig) && (geomlimit > geommin))
527 {
528 // geomlimit is a geometrical step length
529 // transform it to true path length (estimation)
530 if(lambda0 > geomlimit) {
531 geomlimit = -lambda0*G4Log(1.-geomlimit/lambda0)+tlimitmin;
532 }
534 : facrange*rangeinit + stepmin;
535 }
536 else if(geomlimit > geombig) {
537 // range smaller than distance to boundary
538 // here tgeom is the true path length
539 tgeom = currentRange;
540 }
541 else if((geomlimit < geommin) && (geomlimit > 0.)) {
542 // geomlimit small (smaller than geommin=1 um)
543 // here true pathlength ~ geom path length
544 tgeom = geomlimit;
545 }
546
547 //step limit
548 tlimit = (currentRange > presafety) ? facrange*rangeinit : currentRange;
549
550 //lower limit for tlimit
551 tlimit = std::max(tlimit, tlimitmin);
552 tlimit = std::min(tlimit, tgeom);
553 /*
554 G4cout << "tgeom= " << tgeom << " geomlimit= " << geomlimit
555 << " tlimit= " << tlimit << " presafety= " << presafety << G4endl;
556 */
557 // shortcut
558 if((tPathLength < tlimit) && (tPathLength < presafety) &&
559 (smallstep > skin) && (tPathLength < geomlimit-0.999*skindepth))
560 {
562 }
563
564 // step reduction near to boundary
566 {
567 tlimit = stepmin;
568 insideskin = true;
569 }
570 else if(geomlimit < geombig)
571 {
572 if(geomlimit > skindepth)
573 {
574 tlimit = std::min(tlimit, geomlimit-0.999*skindepth);
575 }
576 else
577 {
578 insideskin = true;
579 tlimit = std::min(tlimit, stepmin);
580 }
581 }
582
583 tlimit = std::max(tlimit, stepmin);
584
585 // randomise if not 'small' step and step determined by msc
586 tPathLength = (tlimit < tPathLength && smallstep > skin && !insideskin)
587 ? std::min(tPathLength, Randomizetlimit())
588 : std::min(tPathLength, tlimit);
589 }
590 // ----------------------------------------------------------------
591 // for simulation with or without magnetic field
592 // there no small step/single scattering at boundaries
594 {
596 rangeinit = currentRange;
597 fr = facrange;
598 // stepping for e+/e- only (not for muons,hadrons)
599 if(mass < masslimite)
600 {
601 rangeinit = std::max(rangeinit, lambda0);
603 fr *= (0.75+0.25*lambda0/lambdalimit);
604 }
605 }
606 //lower limit for tlimit
607 stepmin = ComputeStepmin();
608 tlimitmin = ComputeTlimitmin();
609 }
610
611 //step limit
612 tlimit = (currentRange > presafety) ?
613 std::max(fr*rangeinit, facsafety*presafety) : currentRange;
614
615 //lower limit for tlimit
616 tlimit = std::max(tlimit, tlimitmin);
617
618 // randomise if step determined by msc
619 tPathLength = (tlimit < tPathLength) ?
620 std::min(tPathLength, Randomizetlimit()) : tPathLength;
621 }
622 // ----------------------------------------------------------------
623 // for simulation with or without magnetic field
624 // there is small step/single scattering at boundaries
626 {
628 rangeinit = currentRange;
629 fr = facrange;
630 if(mass < masslimite)
631 {
633 fr *= (0.84+0.16*lambda0/lambdalimit);
634 }
635 }
636 //lower limit for tlimit
637 stepmin = ComputeStepmin();
638 tlimitmin = ComputeTlimitmin();
639 }
640 //step limit
641 tlimit = (currentRange > presafety) ?
642 std::max(fr*rangeinit, facsafety*presafety) : currentRange;
643
644 //lower limit for tlimit
645 tlimit = std::max(tlimit, tlimitmin);
646
647 // condition for tPathLength from drr and finalr
648 if(currentRange > finalr) {
649 G4double tmax = drr*currentRange+
650 finalr*(1.-drr)*(2.-finalr/currentRange);
651 tPathLength = std::min(tPathLength,tmax);
652 }
653
654 // randomise if step determined by msc
655 tPathLength = (tlimit < tPathLength) ?
656 std::min(tPathLength, Randomizetlimit()) : tPathLength;
657 }
658
659 // ----------------------------------------------------------------
660 // simple step limitation
661 else
662 {
664 {
665 tlimit = (currentRange > lambda0)
667 tlimit = std::max(tlimit, tlimitmin);
668 }
669 // randomise if step determined by msc
670 tPathLength = (tlimit < tPathLength) ?
671 std::min(tPathLength, Randomizetlimit()) : tPathLength;
672 }
673
674 // ----------------------------------------------------------------
675 firstStep = false;
677}
G4double GetLogKineticEnergy() const
G4double GetKineticEnergy() const
G4StepPoint * GetPreStepPoint() const
const G4DynamicParticle * GetDynamicParticle() const
const G4MaterialCutsCouple * GetMaterialCutsCouple() const
const G4Step * GetStep() const
void SetCurrentCouple(const G4MaterialCutsCouple *)
Definition G4VEmModel.hh:470
G4double ComputeGeomLimit(const G4Track &, G4double &presafety, G4double limit)
Definition G4VMscModel.hh:296
G4double GetRange(const G4ParticleDefinition *part, G4double kineticEnergy, const G4MaterialCutsCouple *couple)
Definition G4VMscModel.cc:169
G4double ConvertTrueToGeom(G4double &tLength, G4double &gLength)
Definition G4VMscModel.hh:286
G4double ComputeSafety(const G4ThreeVector &position, G4double limit=DBL_MAX)
Definition G4VMscModel.hh:278
◆ ComputeTrueStepLength()
Implements G4VMscModel.
Definition at line 742 of file G4UrbanMscModel.cc.
743{
744 // step defined other than transportation
745 if(geomStepLength == zPathLength) {
746 //G4cout << "Urban::ComputeTrueLength: tPathLength= " << tPathLength
747 // << " step= " << geomStepLength << " *** " << G4endl;
748 return tPathLength;
749 }
750
751 zPathLength = geomStepLength;
752
753 // t = z for very small step
754 if(geomStepLength < tlimitminfix2) {
755 tPathLength = geomStepLength;
756
757 // recalculation
758 } else {
759
760 G4double tlength = geomStepLength;
761 if((geomStepLength > lambda0*tausmall) && !insideskin) {
762
763 if(par1 < 0.) {
764 tlength = -lambda0*G4Log(1.-geomStepLength/lambda0) ;
765 } else {
767 if(par4*geomStepLength < 1.) {
769 } else {
770 tlength = currentRange;
771 }
772 }
773
774 if(tlength < geomStepLength) { tlength = geomStepLength; }
775 else if(tlength > tPathLength) { tlength = tPathLength; }
776 }
777 tPathLength = tlength;
778 }
779 //G4cout << "Urban::ComputeTrueLength: tPathLength= " << tPathLength
780 // << " step= " << geomStepLength << " &&& " << G4endl;
781
782 return tPathLength;
783}
◆ Initialise()
|
overridevirtual |
Implements G4VEmModel.
Definition at line 133 of file G4UrbanMscModel.cc.
135{
136 // set values of some data members
137 SetParticle(p);
138 fParticleChange = GetParticleChangeForMSC(p);
139 InitialiseParameters(p);
140
141 latDisplasmentbackup = latDisplasment;
142
143 // if model is locked parameters should be defined via Set methods
147 }
148
149 // initialise cache only once
150 if(0 == msc.size()) {
151 G4AutoLock l(&theUrbanMutex);
152 if(0 == msc.size()) {
153 isFirstInstance = true;
154 msc.resize(1, nullptr);
155 }
156 l.unlock();
157 }
158 // initialise cache for each new run
159 if(isFirstInstance) { InitialiseModelCache(); }
160
161 /*
162 G4cout << "### G4UrbanMscModel::Initialise done for "
163 << p->GetParticleName() << " type= " << steppingAlgorithm << G4endl;
164 G4cout << " RangeFact= " << facrange << " GeomFact= " << facgeom
165 << " SafetyFact= " << facsafety << " LambdaLim= " << lambdalimit
166 << G4endl;
167 */
168}
G4bool LateralDisplacementAlg96() const
Definition G4EmParameters.cc:349
G4bool MscPositronCorrection() const
Definition G4EmParameters.cc:532
G4ParticleChangeForMSC * GetParticleChangeForMSC(const G4ParticleDefinition *p=nullptr)
Definition G4VMscModel.cc:77
void InitialiseParameters(const G4ParticleDefinition *)
Definition G4VMscModel.cc:96
◆ operator=()
|
delete |
◆ SampleScattering()
|
overridevirtual |
Implements G4VMscModel.
Definition at line 788 of file G4UrbanMscModel.cc.
790{
791 fDisplacement.set(0.0,0.0,0.0);
793
794 G4double kinEnergy = currentKinEnergy;
796 kinEnergy = GetEnergy(particle,currentRange-tPathLength,couple);
797 } else if(tPathLength > currentRange*0.01) {
798 kinEnergy -= tPathLength*GetDEDX(particle,currentKinEnergy,couple,
799 currentLogKinEnergy);
800 }
801
802 if((tPathLength <= tlimitminfix) || (tPathLength < tausmall*lambda0) ||
804
805 G4double cth = SampleCosineTheta(tPathLength,kinEnergy);
806
807 // protection against 'bad' cth values
809
810 G4double sth = std::sqrt((1.0 - cth)*(1.0 + cth));
811 G4double phi = CLHEP::twopi*rndmEngineMod->flat();
812 G4ThreeVector newDirection(sth*std::cos(phi),sth*std::sin(phi),cth);
813 newDirection.rotateUz(oldDirection);
814
815 fParticleChange->ProposeMomentumDirection(newDirection);
816 /*
817 G4cout << "G4UrbanMscModel::SampleSecondaries: e(MeV)= " << kineticEnergy
818 << " sinTheta= " << sth << " safety(mm)= " << safety
819 << " trueStep(mm)= " << tPathLength
820 << " geomStep(mm)= " << zPathLength
821 << G4endl;
822 */
823
825 if(dispAlg96) { SampleDisplacement(sth, phi); }
826 else { SampleDisplacementNew(cth, phi); }
827 fDisplacement.rotateUz(oldDirection);
828 }
830}
G4double GetDEDX(const G4ParticleDefinition *part, G4double kineticEnergy, const G4MaterialCutsCouple *couple)
Definition G4VMscModel.cc:139
◆ SetDisplacementAlgorithm96()
|
inline |
Definition at line 268 of file G4UrbanMscModel.hh.
269{
270 dispAlg96 = val;
271}
◆ SetPositronCorrection()
|
inline |
Definition at line 275 of file G4UrbanMscModel.hh.
276{
277 fPosiCorrection = val;
278}
◆ StartTracking()
|
overridevirtual |
Reimplemented from G4VEmModel.
Definition at line 418 of file G4UrbanMscModel.cc.
419{
421 firstStep = true;
422 insideskin = false;
423 fr = facrange;
424 tlimit = tgeom = rangeinit = geombig;
425 smallstep = 1.e10;
426 stepmin = tlimitminfix;
427 tlimitmin = 10.*tlimitminfix;
428 rndmEngineMod = G4Random::getTheEngine();
429}
G4ParticleDefinition * GetDefinition() const
The documentation for this class was generated from the following files:
