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G4UrbanMscModel Class Reference
#include <G4UrbanMscModel.hh>
Inheritance diagram for G4UrbanMscModel:
Detailed Description
Definition at line 70 of file G4UrbanMscModel.hh.
Constructor & Destructor Documentation
◆ G4UrbanMscModel() [1/2]
|
explicit |
Definition at line 82 of file G4UrbanMscModel.cc.
83 : G4VMscModel(nam)
84{
85 masslimite = 0.6*MeV;
86 fr = 0.02;
87 taubig = 8.0;
88 tausmall = 1.e-16;
89 taulim = 1.e-6;
90 currentTau = taulim;
91 tlimitminfix = 0.01*nm;
92 tlimitminfix2 = 1.*nm;
93 stepmin = tlimitminfix;
94 smallstep = 1.e10;
95 currentRange = 0. ;
96 rangeinit = 0.;
97 tlimit = 1.e10*mm;
98 tlimitmin = 10.*tlimitminfix;
99 tgeom = 1.e50*mm;
100 geombig = 1.e50*mm;
101 geommin = 1.e-3*mm;
102 geomlimit = geombig;
103 presafety = 0.*mm;
104
105 particle = nullptr;
106
107 positron = G4Positron::Positron();
108 theManager = G4LossTableManager::Instance();
109 rndmEngineMod = G4Random::getTheEngine();
110
111 firstStep = true;
112 insideskin = false;
113 latDisplasmentbackup = false;
114 dispAlg96 = true;
115
116 rangecut = geombig;
117 drr = 0.35;
118 finalr = 10.*um;
119
120 tlow = 5.*CLHEP::keV;
121 invmev = 1.0/CLHEP::MeV;
122
123 skindepth = skin*stepmin;
124
125 mass = proton_mass_c2;
126 charge = ChargeSquare = 1.0;
127 currentKinEnergy = currentRadLength = lambda0 = lambdaeff = tPathLength
128 = zPathLength = par1 = par2 = par3 = 0;
129 currentLogKinEnergy = LOG_EKIN_MIN;
130
131 idx = 0;
132 fParticleChange = nullptr;
133 couple = nullptr;
134}
static G4LossTableManager * Instance()
Definition: G4LossTableManager.cc:87
Definition: G4VMscModel.hh:67
◆ ~G4UrbanMscModel()
|
override |
Definition at line 138 of file G4UrbanMscModel.cc.
139{
141 for(auto & ptr : msc) { delete ptr; }
142 msc.clear();
143 }
144}
◆ G4UrbanMscModel() [2/2]
|
delete |
Member Function Documentation
◆ ComputeCrossSectionPerAtom()
|
overridevirtual |
Reimplemented from G4VEmModel.
Definition at line 170 of file G4UrbanMscModel.cc.
175{
177
179 50., 56., 64., 74., 79., 82. };
180
181 // corr. factors for e-/e+ lambda for T <= Tlim
183 {{1.125,1.072,1.051,1.047,1.047,1.050,1.052,1.054,
184 1.054,1.057,1.062,1.069,1.075,1.090,1.105,1.111,
185 1.112,1.108,1.100,1.093,1.089,1.087 },
186 {1.408,1.246,1.143,1.096,1.077,1.059,1.053,1.051,
187 1.052,1.053,1.058,1.065,1.072,1.087,1.101,1.108,
188 1.109,1.105,1.097,1.090,1.086,1.082 },
189 {2.833,2.268,1.861,1.612,1.486,1.309,1.204,1.156,
190 1.136,1.114,1.106,1.106,1.109,1.119,1.129,1.132,
191 1.131,1.124,1.113,1.104,1.099,1.098 },
192 {3.879,3.016,2.380,2.007,1.818,1.535,1.340,1.236,
193 1.190,1.133,1.107,1.099,1.098,1.103,1.110,1.113,
194 1.112,1.105,1.096,1.089,1.085,1.098 },
195 {6.937,4.330,2.886,2.256,1.987,1.628,1.395,1.265,
196 1.203,1.122,1.080,1.065,1.061,1.063,1.070,1.073,
197 1.073,1.070,1.064,1.059,1.056,1.056 },
198 {9.616,5.708,3.424,2.551,2.204,1.762,1.485,1.330,
199 1.256,1.155,1.099,1.077,1.070,1.068,1.072,1.074,
200 1.074,1.070,1.063,1.059,1.056,1.052 },
201 {11.72,6.364,3.811,2.806,2.401,1.884,1.564,1.386,
202 1.300,1.180,1.112,1.082,1.073,1.066,1.068,1.069,
203 1.068,1.064,1.059,1.054,1.051,1.050 },
204 {18.08,8.601,4.569,3.183,2.662,2.025,1.646,1.439,
205 1.339,1.195,1.108,1.068,1.053,1.040,1.039,1.039,
206 1.039,1.037,1.034,1.031,1.030,1.036 },
207 {18.22,10.48,5.333,3.713,3.115,2.367,1.898,1.631,
208 1.498,1.301,1.171,1.105,1.077,1.048,1.036,1.033,
209 1.031,1.028,1.024,1.022,1.021,1.024 },
210 {14.14,10.65,5.710,3.929,3.266,2.453,1.951,1.669,
211 1.528,1.319,1.178,1.106,1.075,1.040,1.027,1.022,
212 1.020,1.017,1.015,1.013,1.013,1.020 },
213 {14.11,11.73,6.312,4.240,3.478,2.566,2.022,1.720,
214 1.569,1.342,1.186,1.102,1.065,1.022,1.003,0.997,
215 0.995,0.993,0.993,0.993,0.993,1.011 },
216 {22.76,20.01,8.835,5.287,4.144,2.901,2.219,1.855,
217 1.677,1.410,1.224,1.121,1.073,1.014,0.986,0.976,
218 0.974,0.972,0.973,0.974,0.975,0.987 },
219 {50.77,40.85,14.13,7.184,5.284,3.435,2.520,2.059,
220 1.837,1.512,1.283,1.153,1.091,1.010,0.969,0.954,
221 0.950,0.947,0.949,0.952,0.954,0.963 },
222 {65.87,59.06,15.87,7.570,5.567,3.650,2.682,2.182,
223 1.939,1.579,1.325,1.178,1.108,1.014,0.965,0.947,
224 0.941,0.938,0.940,0.944,0.946,0.954 },
225 {55.60,47.34,15.92,7.810,5.755,3.767,2.760,2.239,
226 1.985,1.609,1.343,1.188,1.113,1.013,0.960,0.939,
227 0.933,0.930,0.933,0.936,0.939,0.949 }};
228
230 {2.589,2.044,1.658,1.446,1.347,1.217,1.144,1.110,
231 1.097,1.083,1.080,1.086,1.092,1.108,1.123,1.131,
232 1.131,1.126,1.117,1.108,1.103,1.100 },
233 {3.904,2.794,2.079,1.710,1.543,1.325,1.202,1.145,
234 1.122,1.096,1.089,1.092,1.098,1.114,1.130,1.137,
235 1.138,1.132,1.122,1.113,1.108,1.102 },
236 {7.970,6.080,4.442,3.398,2.872,2.127,1.672,1.451,
237 1.357,1.246,1.194,1.179,1.178,1.188,1.201,1.205,
238 1.203,1.190,1.173,1.159,1.151,1.145 },
239 {9.714,7.607,5.747,4.493,3.815,2.777,2.079,1.715,
240 1.553,1.353,1.253,1.219,1.211,1.214,1.225,1.228,
241 1.225,1.210,1.191,1.175,1.166,1.174 },
242 {17.97,12.95,8.628,6.065,4.849,3.222,2.275,1.820,
243 1.624,1.382,1.259,1.214,1.202,1.202,1.214,1.219,
244 1.217,1.203,1.184,1.169,1.160,1.151 },
245 {24.83,17.06,10.84,7.355,5.767,3.707,2.546,1.996,
246 1.759,1.465,1.311,1.252,1.234,1.228,1.238,1.241,
247 1.237,1.222,1.201,1.184,1.174,1.159 },
248 {23.26,17.15,11.52,8.049,6.375,4.114,2.792,2.155,
249 1.880,1.535,1.353,1.281,1.258,1.247,1.254,1.256,
250 1.252,1.234,1.212,1.194,1.183,1.170 },
251 {22.33,18.01,12.86,9.212,7.336,4.702,3.117,2.348,
252 2.015,1.602,1.385,1.297,1.268,1.251,1.256,1.258,
253 1.254,1.237,1.214,1.195,1.185,1.179 },
254 {33.91,24.13,15.71,10.80,8.507,5.467,3.692,2.808,
255 2.407,1.873,1.564,1.425,1.374,1.330,1.324,1.320,
256 1.312,1.288,1.258,1.235,1.221,1.205 },
257 {32.14,24.11,16.30,11.40,9.015,5.782,3.868,2.917,
258 2.490,1.925,1.596,1.447,1.391,1.342,1.332,1.327,
259 1.320,1.294,1.264,1.240,1.226,1.214 },
260 {29.51,24.07,17.19,12.28,9.766,6.238,4.112,3.066,
261 2.602,1.995,1.641,1.477,1.414,1.356,1.342,1.336,
262 1.328,1.302,1.270,1.245,1.231,1.233 },
263 {38.19,30.85,21.76,15.35,12.07,7.521,4.812,3.498,
264 2.926,2.188,1.763,1.563,1.484,1.405,1.382,1.371,
265 1.361,1.330,1.294,1.267,1.251,1.239 },
266 {49.71,39.80,27.96,19.63,15.36,9.407,5.863,4.155,
267 3.417,2.478,1.944,1.692,1.589,1.480,1.441,1.423,
268 1.409,1.372,1.330,1.298,1.280,1.258 },
269 {59.25,45.08,30.36,20.83,16.15,9.834,6.166,4.407,
270 3.641,2.648,2.064,1.779,1.661,1.531,1.482,1.459,
271 1.442,1.400,1.354,1.319,1.299,1.272 },
272 {56.38,44.29,30.50,21.18,16.51,10.11,6.354,4.542,
273 3.752,2.724,2.116,1.817,1.692,1.554,1.499,1.474,
274 1.456,1.412,1.364,1.328,1.307,1.282 }};
275
276 //data/corrections for T > Tlim
277
279 120.70, 117.50, 105.00, 92.92, 79.23, 74.510, 68.29,
280 57.39, 41.97, 36.14, 24.53, 10.21, -7.855, -16.84,
281 -22.30};
282
283 G4double sigma;
284 SetParticle(part);
285
287
288 // correction if particle .ne. e-/e+
289 // compute equivalent kinetic energy
290 // lambda depends on p*beta ....
291
293
294 if(mass > electron_mass_c2)
295 {
297 G4double c = mass*TAU*(TAU+2.)/(electron_mass_c2*(TAU+1.)) ;
298 G4double w = c-2. ;
299 G4double tau = 0.5*(w+sqrt(w*w+4.*c)) ;
300 eKineticEnergy = electron_mass_c2*tau ;
301 }
302
303 G4double eTotalEnergy = eKineticEnergy + electron_mass_c2 ;
304 G4double beta2 = eKineticEnergy*(eTotalEnergy+electron_mass_c2)
305 /(eTotalEnergy*eTotalEnergy);
306 G4double bg2 = eKineticEnergy*(eTotalEnergy+electron_mass_c2)
307 /(electron_mass_c2*electron_mass_c2);
308
310 CLHEP::electron_mass_c2*CLHEP::Bohr_radius*CLHEP::Bohr_radius
311 /(CLHEP::hbarc*CLHEP::hbarc);
312 G4double eps = epsfactor*bg2/Z23;
313
314 if (eps<epsmin) sigma = 2.*eps*eps;
317
318 sigma *= ChargeSquare*AtomicNumber*AtomicNumber/(beta2*bg2);
319
320 // interpolate in AtomicNumber and beta2
321 G4double c1,c2,cc1,cc2,corr;
322
323 // get bin number in Z
324 G4int iZ = 14;
325 // Loop checking, 03-Aug-2015, Vladimir Ivanchenko
326 while ((iZ>=0)&&(Zdat[iZ]>=AtomicNumber)) iZ -= 1;
327
328 iZ = std::min(std::max(iZ, 0), 13);
329
330 G4double ZZ1 = Zdat[iZ];
331 G4double ZZ2 = Zdat[iZ+1];
332 G4double ratZ = (AtomicNumber-ZZ1)*(AtomicNumber+ZZ1)/
333 ((ZZ2-ZZ1)*(ZZ2+ZZ1));
334
337 CLHEP::twopi*CLHEP::classic_electr_radius*CLHEP::classic_electr_radius;
339 ((Tlim+CLHEP::electron_mass_c2)*(Tlim+CLHEP::electron_mass_c2));
341 (CLHEP::electron_mass_c2*CLHEP::electron_mass_c2);
342
344 0.2672*CLHEP::barn, 0.5922*CLHEP::barn, 2.653*CLHEP::barn, 6.235*CLHEP::barn,
345 11.69*CLHEP::barn , 13.24*CLHEP::barn , 16.12*CLHEP::barn, 23.00*CLHEP::barn,
346 35.13*CLHEP::barn , 39.95*CLHEP::barn , 50.85*CLHEP::barn, 67.19*CLHEP::barn,
347 91.15*CLHEP::barn , 104.4*CLHEP::barn , 113.1*CLHEP::barn};
348
350 100*CLHEP::eV, 200*CLHEP::eV, 400*CLHEP::eV, 700*CLHEP::eV,
351 1*CLHEP::keV, 2*CLHEP::keV, 4*CLHEP::keV, 7*CLHEP::keV,
352 10*CLHEP::keV, 20*CLHEP::keV, 40*CLHEP::keV, 70*CLHEP::keV,
353 100*CLHEP::keV, 200*CLHEP::keV, 400*CLHEP::keV, 700*CLHEP::keV,
354 1*CLHEP::MeV, 2*CLHEP::MeV, 4*CLHEP::MeV, 7*CLHEP::MeV,
355 10*CLHEP::MeV, 20*CLHEP::MeV};
356
357 if(eKineticEnergy <= Tlim)
358 {
359 // get bin number in T (beta2)
360 G4int iT = 21;
361 // Loop checking, 03-Aug-2015, Vladimir Ivanchenko
362 while ((iT>=0)&&(Tdat[iT]>=eKineticEnergy)) iT -= 1;
363
364 iT = std::min(std::max(iT, 0), 20);
365
366 // calculate betasquare values
367 G4double T = Tdat[iT], E = T + electron_mass_c2;
368 G4double b2small = T*(E+electron_mass_c2)/(E*E);
369
370 T = Tdat[iT+1]; E = T + electron_mass_c2;
371 G4double b2big = T*(E+electron_mass_c2)/(E*E);
372 G4double ratb2 = (beta2-b2small)/(b2big-b2small);
373
374 if (charge < 0.)
375 {
376 c1 = celectron[iZ][iT];
377 c2 = celectron[iZ+1][iT];
378 cc1 = c1+ratZ*(c2-c1);
379
380 c1 = celectron[iZ][iT+1];
381 c2 = celectron[iZ+1][iT+1];
382 cc2 = c1+ratZ*(c2-c1);
383
384 corr = cc1+ratb2*(cc2-cc1);
385
386 sigma *= sigmafactor/corr;
387 }
388 else
389 {
390 c1 = cpositron[iZ][iT];
391 c2 = cpositron[iZ+1][iT];
392 cc1 = c1+ratZ*(c2-c1);
393
394 c1 = cpositron[iZ][iT+1];
395 c2 = cpositron[iZ+1][iT+1];
396 cc2 = c1+ratZ*(c2-c1);
397
398 corr = cc1+ratb2*(cc2-cc1);
399
400 sigma *= sigmafactor/corr;
401 }
402 }
403 else
404 {
405 c1 = bg2lim*sig0[iZ]*(1.+hecorr[iZ]*(beta2-beta2lim))/bg2;
406 c2 = bg2lim*sig0[iZ+1]*(1.+hecorr[iZ+1]*(beta2-beta2lim))/bg2;
407 if((AtomicNumber >= ZZ1) && (AtomicNumber <= ZZ2))
408 sigma = c1+ratZ*(c2-c1) ;
409 else if(AtomicNumber < ZZ1)
410 sigma = AtomicNumber*AtomicNumber*c1/(ZZ1*ZZ1);
411 else if(AtomicNumber > ZZ2)
412 sigma = AtomicNumber*AtomicNumber*c2/(ZZ2*ZZ2);
413 }
414 // low energy correction based on theory
415 sigma *= 1.+0.30/(1.+sqrt(1000.*eKineticEnergy));
416
417 return sigma;
418
419}
@ KineticEnergy
◆ ComputeGeomPathLength()
Implements G4VMscModel.
Definition at line 715 of file G4UrbanMscModel.cc.
716{
717 lambdaeff = lambda0;
718 par1 = -1. ;
719 par2 = par3 = 0. ;
720
721 // this correction needed to run MSC with eIoni and eBrem inactivated
722 // and makes no harm for a normal run
723 tPathLength = std::min(tPathLength,currentRange);
724
725 // do the true -> geom transformation
726 zPathLength = tPathLength;
727
728 // z = t for very small tPathLength
729 if(tPathLength < tlimitminfix2) return zPathLength;
730
731 /*
732 G4cout << "ComputeGeomPathLength: tpl= " << tPathLength
733 << " R= " << currentRange << " L0= " << lambda0
734 << " E= " << currentKinEnergy << " "
735 << particle->GetParticleName() << G4endl;
736 */
737 G4double tau = tPathLength/lambda0 ;
738
739 if ((tau <= tausmall) || insideskin) {
740 zPathLength = std::min(tPathLength, lambda0);
741
743 if(tau < taulim) zPathLength = tPathLength*(1.-0.5*tau) ;
745
746 } else if(currentKinEnergy < mass || tPathLength == currentRange) {
747 par1 = 1./currentRange ;
748 par2 = 1./(par1*lambda0) ;
749 par3 = 1.+par2 ;
750 if(tPathLength < currentRange) {
751 zPathLength =
753 } else {
754 zPathLength = 1./(par1*par3);
755 }
756
757 } else {
758 G4double rfin = std::max(currentRange-tPathLength, 0.01*currentRange);
761
762 par1 = (lambda0-lambda1)/(lambda0*tPathLength);
763 //G4cout << "par1= " << par1 << " L1= " << lambda1 << G4endl;
764 par2 = 1./(par1*lambda0);
765 par3 = 1.+par2 ;
767 }
768
769 zPathLength = std::min(zPathLength, lambda0);
770 //G4cout<< "zPathLength= "<< zPathLength<< " L0= " << lambda0 << G4endl;
771 return zPathLength;
772}
G4double GetTransportMeanFreePath(const G4ParticleDefinition *part, G4double kinEnergy)
Definition: G4VMscModel.hh:405
G4double GetEnergy(const G4ParticleDefinition *part, G4double range, const G4MaterialCutsCouple *couple)
Definition: G4VMscModel.hh:368
◆ ComputeTheta0()
Definition at line 1056 of file G4UrbanMscModel.cc.
1058{
1059 // for all particles take the width of the central part
1060 // from a parametrization similar to the Highland formula
1061 // ( Highland formula: Particle Physics Booklet, July 2002, eq. 26.10)
1062 G4double invbetacp = std::sqrt((currentKinEnergy+mass)*(KineticEnergy+mass)/
1063 (currentKinEnergy*(currentKinEnergy+2.*mass)*
1064 KineticEnergy*(KineticEnergy+2.*mass)));
1065 G4double y = trueStepLength/currentRadLength;
1066
1067 if(particle == positron)
1068 {
1069 G4double Zeff = msc[idx]->Zeff;
1073 G4double corr;
1074
1075 G4double tau = std::sqrt(currentKinEnergy*KineticEnergy)/mass;
1076 G4double x = std::sqrt(tau*(tau+2.)/((tau+1.)*(tau+1.)));
1077 G4double a = 0.994-4.08e-3*Zeff;
1078 G4double b = 7.16+(52.6+365./Zeff)/Zeff;
1079 G4double c = 1.000-4.47e-3*Zeff;
1080 G4double d = 1.21e-3*Zeff;
1081 if(x < xl) {
1082 corr = a*(1.-G4Exp(-b*x));
1083 } else if(x > xh) {
1084 corr = c+d*G4Exp(e*(x-1.));
1085 } else {
1088 G4double y0 = (yh-yl)/(xh-xl);
1089 G4double y1 = yl-y0*xl;
1090 corr = y0*x+y1;
1091 }
1092 //==================================================================
1093 y *= corr*(1.+Zeff*(1.84035e-4*Zeff-1.86427e-2)+0.41125);
1094 }
1095
1097 G4double theta0 = c_highland*std::abs(charge)*std::sqrt(y)*invbetacp;
1098
1099 // correction factor from e- scattering data
1100 theta0 *= (msc[idx]->coeffth1+msc[idx]->coeffth2*G4Log(y));
1101 return theta0;
1102}
◆ ComputeTruePathLengthLimit()
|
overridevirtual |
Implements G4VMscModel.
Definition at line 438 of file G4UrbanMscModel.cc.
441{
442 tPathLength = currentMinimalStep;
444
447 couple = track.GetMaterialCutsCouple();
448 SetCurrentCouple(couple);
449 idx = couple->GetIndex();
450 currentKinEnergy = dp->GetKineticEnergy();
451 currentLogKinEnergy = dp->GetLogKineticEnergy();
452 currentRange = GetRange(particle,currentKinEnergy,couple,currentLogKinEnergy);
453 lambda0 = GetTransportMeanFreePath(particle,currentKinEnergy,
454 currentLogKinEnergy);
455 tPathLength = std::min(tPathLength,currentRange);
456 /*
457 G4cout << "G4Urban::StepLimit tPathLength= " << tPathLength
458 << " range= " <<currentRange<< " lambda= "<<lambda0
459 <<G4endl;
460 */
461
462 // stop here if small step
463 if(tPathLength < tlimitminfix) {
466 }
467
468 // upper limit for the straight line distance the particle can travel
469 // for electrons and positrons
470 G4double distance = (mass < masslimite)
471 ? currentRange*msc[idx]->doverra
472 // for muons, hadrons
473 : currentRange*msc[idx]->doverrb;
474
475 presafety = sp->GetSafety();
476 /*
477 G4cout << "G4Urban::StepLimit tPathLength= "
478 <<tPathLength<<" safety= " << presafety
479 << " range= " <<currentRange<< " lambda= "<<lambda0
480 << " Alg: " << steppingAlgorithm <<G4endl;
481 */
482 // far from geometry boundary
483 if(distance < presafety)
484 {
487 }
488
489 latDisplasment = latDisplasmentbackup;
490 // standard version
491 //
493 {
494 //compute geomlimit and presafety
495 geomlimit = ComputeGeomLimit(track, presafety, currentRange);
496 /*
497 G4cout << "G4Urban::Distance to boundary geomlimit= "
498 <<geomlimit<<" safety= " << presafety<<G4endl;
499 */
500
501 // is it far from boundary ?
502 if(distance < presafety)
503 {
506 }
507
508 smallstep += 1.;
509 insideskin = false;
510
511 // initialisation at firs step and at the boundary
513 {
514 rangeinit = currentRange;
515 if(!firstStep) { smallstep = 1.; }
516
517 //stepmin ~ lambda_elastic
518 stepmin = ComputeStepmin();
519 skindepth = skin*stepmin;
520 tlimitmin = ComputeTlimitmin();
521 /*
522 G4cout << "rangeinit= " << rangeinit << " stepmin= " << stepmin
523 << " tlimitmin= " << tlimitmin << " geomlimit= "
524 << geomlimit <<G4endl;
525 */
526 // constraint from the geometry
527
528 if((geomlimit < geombig) && (geomlimit > geommin))
529 {
530 // geomlimit is a geometrical step length
531 // transform it to true path length (estimation)
532 if(lambda0 > geomlimit) {
533 geomlimit = -lambda0*G4Log(1.-geomlimit/lambda0)+tlimitmin;
534 }
535 tgeom = (stepStatus == fGeomBoundary)
537 }
538 else
539 {
540 tgeom = geombig;
541 }
542 }
543
544 //step limit
545 tlimit = (currentRange > presafety) ?
547
548 //lower limit for tlimit
549 tlimit = std::min(std::max(tlimit,tlimitmin), tgeom);
550 /*
551 G4cout << "tgeom= " << tgeom << " geomlimit= " << geomlimit
552 << " tlimit= " << tlimit << " presafety= " << presafety << G4endl;
553 */
554 // shortcut
555 if((tPathLength < tlimit) && (tPathLength < presafety) &&
556 (smallstep > skin) && (tPathLength < geomlimit-0.999*skindepth))
557 {
559 }
560
561 // step reduction near to boundary
563 {
564 tlimit = stepmin;
565 insideskin = true;
566 }
567 else if(geomlimit < geombig)
568 {
569 if(geomlimit > skindepth)
570 {
571 tlimit = std::min(tlimit, geomlimit-0.999*skindepth);
572 }
573 else
574 {
575 insideskin = true;
576 tlimit = std::min(tlimit, stepmin);
577 }
578 }
579
580 tlimit = std::max(tlimit, stepmin);
581
582 // randomise if not 'small' step and step determined by msc
583 tPathLength = ((tlimit < tPathLength)&&(smallstep > skin)&& !insideskin)
584 ? std::min(tPathLength, Randomizetlimit())
585 : std::min(tPathLength, tlimit);
586 }
587 // for 'normal' simulation with or without magnetic field
588 // there no small step/single scattering at boundaries
590 {
593 }
594 /*
595 G4cout << "presafety= " << presafety
596 << " firstStep= " << firstStep
597 << " stepStatus= " << stepStatus
598 << G4endl;
599 */
600 // is far from boundary
601 if(distance < presafety)
602 {
605 }
606
608 rangeinit = currentRange;
609 fr = facrange;
610 // 9.1 like stepping for e+/e- only (not for muons,hadrons)
611 if(mass < masslimite)
612 {
613 rangeinit = std::max(rangeinit, lambda0);
615 fr *= (0.75+0.25*lambda0/lambdalimit);
616 }
617 }
618 //lower limit for tlimit
619 stepmin = ComputeStepmin();
620 tlimitmin = ComputeTlimitmin();
621 }
622
623 //step limit
624 tlimit = (currentRange > presafety) ?
625 std::max(fr*rangeinit, facsafety*presafety) : currentRange;
626
627 //lower limit for tlimit
628 tlimit = std::max(tlimit, tlimitmin);
629
630 // randomise if step determined by msc
631 tPathLength = (tlimit < tPathLength) ?
632 std::min(tPathLength, Randomizetlimit()) : tPathLength;
633 }
634 // new stepping mode UseSafetyPlus
636 {
639 }
640 /*
641 G4cout << "presafety= " << presafety
642 << " firstStep= " << firstStep
643 << " stepStatus= " << stepStatus
644 << G4endl;
645 */
646 // is far from boundary
647 if(distance < presafety)
648 {
651 }
652
654 rangeinit = currentRange;
655 fr = facrange;
656 rangecut = geombig;
657 if(mass < masslimite)
658 {
659 rangecut = msc[idx]->ecut;
661 fr *= (0.84+0.16*lambda0/lambdalimit);
662 }
663 }
664 //lower limit for tlimit
665 stepmin = ComputeStepmin();
666 tlimitmin = ComputeTlimitmin();
667 }
668 //step limit
669 tlimit = (currentRange > presafety) ?
670 std::max(fr*rangeinit, facsafety*presafety) : currentRange;
671
672 //lower limit for tlimit
673 tlimit = std::max(tlimit, tlimitmin);
674
675 // condition for tPathLength from drr and finalr
676 if(currentRange > finalr) {
677 G4double tmax = drr*currentRange+
678 finalr*(1.-drr)*(2.-finalr/currentRange);
679 tPathLength = std::min(tPathLength,tmax);
680 }
681
682 // condition safety
683 if(currentRange > rangecut) {
684 if(firstStep) {
685 tPathLength = std::min(tPathLength,facsafety*presafety);
687 tPathLength = std::min(tPathLength,presafety);
688 }
689 }
690
691 // randomise if step determined by msc
692 tPathLength = (tlimit < tPathLength) ?
693 std::min(tPathLength, Randomizetlimit()) : tPathLength;
694 }
695
696 // simple step limitation
697 else
698 {
700 {
701 tlimit = (currentRange > lambda0)
703 tlimit = std::max(tlimit, tlimitmin);
704 }
705 // randomise if step determined by msc
706 tPathLength = (tlimit < tPathLength) ?
707 std::min(tPathLength, Randomizetlimit()) : tPathLength;
708 }
709 firstStep = false;
711}
Definition: G4DynamicParticle.hh:65
G4double GetLogKineticEnergy() const
G4double GetKineticEnergy() const
Definition: G4StepPoint.hh:56
G4StepPoint * GetPreStepPoint() const
const G4DynamicParticle * GetDynamicParticle() const
const G4MaterialCutsCouple * GetMaterialCutsCouple() const
const G4Step * GetStep() const
void SetCurrentCouple(const G4MaterialCutsCouple *)
Definition: G4VEmModel.hh:465
G4double ComputeGeomLimit(const G4Track &, G4double &presafety, G4double limit)
Definition: G4VMscModel.hh:287
G4double GetRange(const G4ParticleDefinition *part, G4double kineticEnergy, const G4MaterialCutsCouple *couple)
Definition: G4VMscModel.hh:330
G4double ConvertTrueToGeom(G4double &tLength, G4double &gLength)
Definition: G4VMscModel.hh:277
G4double ComputeSafety(const G4ThreeVector &position, G4double limit=DBL_MAX)
Definition: G4VMscModel.hh:269
◆ ComputeTrueStepLength()
Implements G4VMscModel.
Definition at line 776 of file G4UrbanMscModel.cc.
777{
778 // step defined other than transportation
779 if(geomStepLength == zPathLength) {
780 //G4cout << "Urban::ComputeTrueLength: tPathLength= " << tPathLength
781 // << " step= " << geomStepLength << " *** " << G4endl;
782 return tPathLength;
783 }
784
785 zPathLength = geomStepLength;
786
787 // t = z for very small step
788 if(geomStepLength < tlimitminfix2) {
789 tPathLength = geomStepLength;
790
791 // recalculation
792 } else {
793
794 G4double tlength = geomStepLength;
795 if((geomStepLength > lambda0*tausmall) && !insideskin) {
796
797 if(par1 < 0.) {
798 tlength = -lambda0*G4Log(1.-geomStepLength/lambda0) ;
799 } else {
800 if(par1*par3*geomStepLength < 1.) {
802 } else {
803 tlength = currentRange;
804 }
805 }
806
807 if(tlength < geomStepLength) { tlength = geomStepLength; }
808 else if(tlength > tPathLength) { tlength = tPathLength; }
809 }
810 tPathLength = tlength;
811 }
812 //G4cout << "Urban::ComputeTrueLength: tPathLength= " << tPathLength
813 // << " step= " << geomStepLength << " &&& " << G4endl;
814
815 return tPathLength;
816}
◆ Initialise()
|
overridevirtual |
Implements G4VEmModel.
Definition at line 148 of file G4UrbanMscModel.cc.
150{
151 // set values of some data members
152 SetParticle(p);
153 fParticleChange = GetParticleChangeForMSC(p);
154 InitialiseParameters(p);
155
156 latDisplasmentbackup = latDisplasment;
159 /*
160 G4cout << "### G4UrbanMscModel::Initialise done for "
161 << p->GetParticleName() << " type= " << steppingAlgorithm << G4endl;
162 G4cout << " RangeFact= " << facrange << " GeomFact= " << facgeom
163 << " SafetyFact= " << facsafety << " LambdaLim= " << lambdalimit
164 << G4endl;
165 */
166}
G4bool LateralDisplacementAlg96() const
Definition: G4EmParameters.cc:325
G4ParticleChangeForMSC * GetParticleChangeForMSC(const G4ParticleDefinition *p=nullptr)
Definition: G4VMscModel.cc:91
void InitialiseParameters(const G4ParticleDefinition *)
Definition: G4VMscModel.cc:139
◆ operator=()
|
delete |
◆ SampleScattering()
|
overridevirtual |
Implements G4VMscModel.
Definition at line 821 of file G4UrbanMscModel.cc.
823{
825 G4double kineticEnergy = currentKinEnergy;
827 kineticEnergy = GetEnergy(particle,currentRange-tPathLength,couple);
828 } else {
829 kineticEnergy -= tPathLength*GetDEDX(particle,currentKinEnergy,couple,
830 currentLogKinEnergy);
831 }
832
833 if((kineticEnergy <= eV) || (tPathLength <= tlimitminfix) ||
835
836 G4double cth = SampleCosineTheta(tPathLength,kineticEnergy);
837
838 // protection against 'bad' cth values
840
841 /*
842 if(cth < 1.0 - 1000*tPathLength/lambda0 && cth < 0.5 &&
843 kineticEnergy > 20*MeV) {
844 G4cout << "### G4UrbanMscModel::SampleScattering for "
845 << particle->GetParticleName()
846 << " E(MeV)= " << kineticEnergy/MeV
847 << " Step(mm)= " << tPathLength/mm
848 << " in " << CurrentCouple()->GetMaterial()->GetName()
849 << " CosTheta= " << cth << G4endl;
850 }
851 */
852 G4double sth = sqrt((1.0 - cth)*(1.0 + cth));
854 G4double dirx = sth*cos(phi);
855 G4double diry = sth*sin(phi);
856
857 G4ThreeVector newDirection(dirx,diry,cth);
858 newDirection.rotateUz(oldDirection);
859
860 fParticleChange->ProposeMomentumDirection(newDirection);
861 /*
862 G4cout << "G4UrbanMscModel::SampleSecondaries: e(MeV)= " << kineticEnergy
863 << " sinTheta= " << sth << " safety(mm)= " << safety
864 << " trueStep(mm)= " << tPathLength
865 << " geomStep(mm)= " << zPathLength
866 << G4endl;
867 */
868
870 if(dispAlg96) { SampleDisplacement(sth, phi); }
871 else { SampleDisplacementNew(cth, phi); }
873 }
875}
Definition: ThreeVector.h:36
void set(double x, double y, double z)
virtual double flat()=0
void ProposeMomentumDirection(const G4ThreeVector &Pfinal)
G4double GetDEDX(const G4ParticleDefinition *part, G4double kineticEnergy, const G4MaterialCutsCouple *couple)
Definition: G4VMscModel.hh:300
◆ StartTracking()
|
overridevirtual |
Reimplemented from G4VEmModel.
Definition at line 423 of file G4UrbanMscModel.cc.
424{
426 firstStep = true;
427 insideskin = false;
428 fr = facrange;
429 tlimit = tgeom = rangeinit = rangecut = geombig;
430 smallstep = 1.e10;
431 stepmin = tlimitminfix;
432 tlimitmin = 10.*tlimitminfix;
433 rndmEngineMod = G4Random::getTheEngine();
434}
G4ParticleDefinition * GetDefinition() const
The documentation for this class was generated from the following files:
