Geant4 11.2.2
Toolkit for the simulation of the passage of particles through matter
Loading...
Searching...
No Matches
G4UrbanMscModel.cc
Go to the documentation of this file.
1//
2// ********************************************************************
3// * License and Disclaimer *
4// * *
5// * The Geant4 software is copyright of the Copyright Holders of *
6// * the Geant4 Collaboration. It is provided under the terms and *
7// * conditions of the Geant4 Software License, included in the file *
8// * LICENSE and available at http://cern.ch/geant4/license . These *
9// * include a list of copyright holders. *
10// * *
11// * Neither the authors of this software system, nor their employing *
12// * institutes,nor the agencies providing financial support for this *
13// * work make any representation or warranty, express or implied, *
14// * regarding this software system or assume any liability for its *
15// * use. Please see the license in the file LICENSE and URL above *
16// * for the full disclaimer and the limitation of liability. *
17// * *
18// * This code implementation is the result of the scientific and *
19// * technical work of the GEANT4 collaboration. *
20// * By using, copying, modifying or distributing the software (or *
21// * any work based on the software) you agree to acknowledge its *
22// * use in resulting scientific publications, and indicate your *
23// * acceptance of all terms of the Geant4 Software license. *
24// ********************************************************************
25//
26// -------------------------------------------------------------------
27//
28// GEANT4 Class file
29//
30//
31// File name: G4UrbanMscModel
32//
33// Author: Laszlo Urban
34//
35// Creation date: 19.02.2013
36//
37// Created from G4UrbanMscModel96
38//
39// New parametrization for theta0
40// Correction for very small step length
41//
42// Class Description:
43//
44// Implementation of the model of multiple scattering based on
45// H.W.Lewis Phys Rev 78 (1950) 526 and others
46
47// -------------------------------------------------------------------
48// In its present form the model can be used for simulation
49// of the e-/e+ multiple scattering
50
51
52//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
53//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
54
55#include "G4UrbanMscModel.hh"
56#include "G4PhysicalConstants.hh"
57#include "G4SystemOfUnits.hh"
58#include "Randomize.hh"
59#include "G4Positron.hh"
60#include "G4EmParameters.hh"
61#include "G4ParticleChangeForMSC.hh"
62#include "G4ProductionCutsTable.hh"
63
64#include "G4Poisson.hh"
65#include "G4Pow.hh"
66#include "G4Log.hh"
67#include "G4Exp.hh"
68#include "G4AutoLock.hh"
69
70//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
71
72std::vector<G4UrbanMscModel::mscData*> G4UrbanMscModel::msc;
73
74namespace
75{
76 G4Mutex theUrbanMutex = G4MUTEX_INITIALIZER;
77}
78
79//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
80
81G4UrbanMscModel::G4UrbanMscModel(const G4String& nam)
82 : G4VMscModel(nam)
83{
84 masslimite = 0.6*CLHEP::MeV;
85 fr = 0.02;
86 taubig = 8.0;
87 tausmall = 1.e-16;
88 taulim = 1.e-6;
89 currentTau = taulim;
90 tlimitminfix = 0.01*CLHEP::nm;
91 tlimitminfix2 = 1.*CLHEP::nm;
92 stepmin = tlimitminfix;
93 smallstep = 1.e10;
94 currentRange = 0.;
95 rangeinit = 0.;
96 tlimit = 1.e10*CLHEP::mm;
97 tlimitmin = 10.*tlimitminfix;
98 tgeom = 1.e50*CLHEP::mm;
99 geombig = tgeom;
100 geommin = 1.e-3*CLHEP::mm;
101 geomlimit = geombig;
102 presafety = 0.;
103
104 positron = G4Positron::Positron();
105 rndmEngineMod = G4Random::getTheEngine();
106
107 drr = 0.35;
108 finalr = 10.*CLHEP::um;
109
110 tlow = 5.*CLHEP::keV;
111 invmev = 1.0/CLHEP::MeV;
112
113 skindepth = skin*stepmin;
114
115 mass = CLHEP::proton_mass_c2;
116 charge = chargeSquare = 1.0;
117 currentKinEnergy = currentRadLength = lambda0 = lambdaeff = tPathLength
118 = zPathLength = par1 = par2 = par3 = rndmarray[0] = rndmarray[1] = 0;
119 currentLogKinEnergy = LOG_EKIN_MIN;
120}
121
122//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
123
124G4UrbanMscModel::~G4UrbanMscModel()
125{
126 if(isFirstInstance) {
127 for(auto & ptr : msc) { delete ptr; }
128 msc.clear();
129 }
130}
131
132//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
133
134void G4UrbanMscModel::Initialise(const G4ParticleDefinition* p,
135 const G4DataVector&)
136{
137 // set values of some data members
138 SetParticle(p);
139 fParticleChange = GetParticleChangeForMSC(p);
140 InitialiseParameters(p);
141
142 latDisplasmentbackup = latDisplasment;
143
144 // if model is locked parameters should be defined via Set methods
145 if(!IsLocked()) {
146 dispAlg96 = G4EmParameters::Instance()->LateralDisplacementAlg96();
147 fPosiCorrection = G4EmParameters::Instance()->MscPositronCorrection();
148 }
149
150 // initialise cache only once
151 if(0 == msc.size()) {
152 G4AutoLock l(&theUrbanMutex);
153 if(0 == msc.size()) {
154 isFirstInstance = true;
155 msc.resize(1, nullptr);
156 }
157 l.unlock();
158 }
159 // initialise cache for each new run
160 if(isFirstInstance) { InitialiseModelCache(); }
161
162 /*
163 G4cout << "### G4UrbanMscModel::Initialise done for "
164 << p->GetParticleName() << " type= " << steppingAlgorithm << G4endl;
165 G4cout << " RangeFact= " << facrange << " GeomFact= " << facgeom
166 << " SafetyFact= " << facsafety << " LambdaLim= " << lambdalimit
167 << G4endl;
168 */
169}
170
171//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
172
173G4double G4UrbanMscModel::ComputeCrossSectionPerAtom(
174 const G4ParticleDefinition* part,
175 G4double kinEnergy,
176 G4double atomicNumber,G4double,
177 G4double, G4double)
178{
179 static const G4double epsmin = 1.e-4 , epsmax = 1.e10;
180
181 static const G4double Zdat[15] = { 4., 6., 13., 20., 26., 29., 32., 38.,47.,
182 50., 56., 64., 74., 79., 82. };
183
184 // corr. factors for e-/e+ lambda for T <= Tlim
185 static const G4double celectron[15][22] =
186 {{1.125,1.072,1.051,1.047,1.047,1.050,1.052,1.054,
187 1.054,1.057,1.062,1.069,1.075,1.090,1.105,1.111,
188 1.112,1.108,1.100,1.093,1.089,1.087 },
189 {1.408,1.246,1.143,1.096,1.077,1.059,1.053,1.051,
190 1.052,1.053,1.058,1.065,1.072,1.087,1.101,1.108,
191 1.109,1.105,1.097,1.090,1.086,1.082 },
192 {2.833,2.268,1.861,1.612,1.486,1.309,1.204,1.156,
193 1.136,1.114,1.106,1.106,1.109,1.119,1.129,1.132,
194 1.131,1.124,1.113,1.104,1.099,1.098 },
195 {3.879,3.016,2.380,2.007,1.818,1.535,1.340,1.236,
196 1.190,1.133,1.107,1.099,1.098,1.103,1.110,1.113,
197 1.112,1.105,1.096,1.089,1.085,1.098 },
198 {6.937,4.330,2.886,2.256,1.987,1.628,1.395,1.265,
199 1.203,1.122,1.080,1.065,1.061,1.063,1.070,1.073,
200 1.073,1.070,1.064,1.059,1.056,1.056 },
201 {9.616,5.708,3.424,2.551,2.204,1.762,1.485,1.330,
202 1.256,1.155,1.099,1.077,1.070,1.068,1.072,1.074,
203 1.074,1.070,1.063,1.059,1.056,1.052 },
204 {11.72,6.364,3.811,2.806,2.401,1.884,1.564,1.386,
205 1.300,1.180,1.112,1.082,1.073,1.066,1.068,1.069,
206 1.068,1.064,1.059,1.054,1.051,1.050 },
207 {18.08,8.601,4.569,3.183,2.662,2.025,1.646,1.439,
208 1.339,1.195,1.108,1.068,1.053,1.040,1.039,1.039,
209 1.039,1.037,1.034,1.031,1.030,1.036 },
210 {18.22,10.48,5.333,3.713,3.115,2.367,1.898,1.631,
211 1.498,1.301,1.171,1.105,1.077,1.048,1.036,1.033,
212 1.031,1.028,1.024,1.022,1.021,1.024 },
213 {14.14,10.65,5.710,3.929,3.266,2.453,1.951,1.669,
214 1.528,1.319,1.178,1.106,1.075,1.040,1.027,1.022,
215 1.020,1.017,1.015,1.013,1.013,1.020 },
216 {14.11,11.73,6.312,4.240,3.478,2.566,2.022,1.720,
217 1.569,1.342,1.186,1.102,1.065,1.022,1.003,0.997,
218 0.995,0.993,0.993,0.993,0.993,1.011 },
219 {22.76,20.01,8.835,5.287,4.144,2.901,2.219,1.855,
220 1.677,1.410,1.224,1.121,1.073,1.014,0.986,0.976,
221 0.974,0.972,0.973,0.974,0.975,0.987 },
222 {50.77,40.85,14.13,7.184,5.284,3.435,2.520,2.059,
223 1.837,1.512,1.283,1.153,1.091,1.010,0.969,0.954,
224 0.950,0.947,0.949,0.952,0.954,0.963 },
225 {65.87,59.06,15.87,7.570,5.567,3.650,2.682,2.182,
226 1.939,1.579,1.325,1.178,1.108,1.014,0.965,0.947,
227 0.941,0.938,0.940,0.944,0.946,0.954 },
228 {55.60,47.34,15.92,7.810,5.755,3.767,2.760,2.239,
229 1.985,1.609,1.343,1.188,1.113,1.013,0.960,0.939,
230 0.933,0.930,0.933,0.936,0.939,0.949 }};
231
232 static const G4double cpositron[15][22] = {
233 {2.589,2.044,1.658,1.446,1.347,1.217,1.144,1.110,
234 1.097,1.083,1.080,1.086,1.092,1.108,1.123,1.131,
235 1.131,1.126,1.117,1.108,1.103,1.100 },
236 {3.904,2.794,2.079,1.710,1.543,1.325,1.202,1.145,
237 1.122,1.096,1.089,1.092,1.098,1.114,1.130,1.137,
238 1.138,1.132,1.122,1.113,1.108,1.102 },
239 {7.970,6.080,4.442,3.398,2.872,2.127,1.672,1.451,
240 1.357,1.246,1.194,1.179,1.178,1.188,1.201,1.205,
241 1.203,1.190,1.173,1.159,1.151,1.145 },
242 {9.714,7.607,5.747,4.493,3.815,2.777,2.079,1.715,
243 1.553,1.353,1.253,1.219,1.211,1.214,1.225,1.228,
244 1.225,1.210,1.191,1.175,1.166,1.174 },
245 {17.97,12.95,8.628,6.065,4.849,3.222,2.275,1.820,
246 1.624,1.382,1.259,1.214,1.202,1.202,1.214,1.219,
247 1.217,1.203,1.184,1.169,1.160,1.151 },
248 {24.83,17.06,10.84,7.355,5.767,3.707,2.546,1.996,
249 1.759,1.465,1.311,1.252,1.234,1.228,1.238,1.241,
250 1.237,1.222,1.201,1.184,1.174,1.159 },
251 {23.26,17.15,11.52,8.049,6.375,4.114,2.792,2.155,
252 1.880,1.535,1.353,1.281,1.258,1.247,1.254,1.256,
253 1.252,1.234,1.212,1.194,1.183,1.170 },
254 {22.33,18.01,12.86,9.212,7.336,4.702,3.117,2.348,
255 2.015,1.602,1.385,1.297,1.268,1.251,1.256,1.258,
256 1.254,1.237,1.214,1.195,1.185,1.179 },
257 {33.91,24.13,15.71,10.80,8.507,5.467,3.692,2.808,
258 2.407,1.873,1.564,1.425,1.374,1.330,1.324,1.320,
259 1.312,1.288,1.258,1.235,1.221,1.205 },
260 {32.14,24.11,16.30,11.40,9.015,5.782,3.868,2.917,
261 2.490,1.925,1.596,1.447,1.391,1.342,1.332,1.327,
262 1.320,1.294,1.264,1.240,1.226,1.214 },
263 {29.51,24.07,17.19,12.28,9.766,6.238,4.112,3.066,
264 2.602,1.995,1.641,1.477,1.414,1.356,1.342,1.336,
265 1.328,1.302,1.270,1.245,1.231,1.233 },
266 {38.19,30.85,21.76,15.35,12.07,7.521,4.812,3.498,
267 2.926,2.188,1.763,1.563,1.484,1.405,1.382,1.371,
268 1.361,1.330,1.294,1.267,1.251,1.239 },
269 {49.71,39.80,27.96,19.63,15.36,9.407,5.863,4.155,
270 3.417,2.478,1.944,1.692,1.589,1.480,1.441,1.423,
271 1.409,1.372,1.330,1.298,1.280,1.258 },
272 {59.25,45.08,30.36,20.83,16.15,9.834,6.166,4.407,
273 3.641,2.648,2.064,1.779,1.661,1.531,1.482,1.459,
274 1.442,1.400,1.354,1.319,1.299,1.272 },
275 {56.38,44.29,30.50,21.18,16.51,10.11,6.354,4.542,
276 3.752,2.724,2.116,1.817,1.692,1.554,1.499,1.474,
277 1.456,1.412,1.364,1.328,1.307,1.282 }};
278
279 //data/corrections for T > Tlim
280
281 static const G4double hecorr[15] = {
282 120.70, 117.50, 105.00, 92.92, 79.23, 74.510, 68.29,
283 57.39, 41.97, 36.14, 24.53, 10.21, -7.855, -16.84,
284 -22.30};
285
286 G4double sigma;
287 SetParticle(part);
288
289 G4double Z23 = G4Pow::GetInstance()->Z23(G4lrint(atomicNumber));
290
291 // correction if particle .ne. e-/e+
292 // compute equivalent kinetic energy
293 // lambda depends on p*beta ....
294
295 G4double eKineticEnergy = kinEnergy;
296
297 if(mass > CLHEP::electron_mass_c2)
298 {
299 G4double TAU = kinEnergy/mass ;
300 G4double c = mass*TAU*(TAU+2.)/(CLHEP::electron_mass_c2*(TAU+1.)) ;
301 G4double w = c-2.;
302 G4double tau = 0.5*(w+std::sqrt(w*w+4.*c)) ;
303 eKineticEnergy = CLHEP::electron_mass_c2*tau ;
304 }
305
306 G4double eTotalEnergy = eKineticEnergy + CLHEP::electron_mass_c2 ;
307 G4double beta2 = eKineticEnergy*(eTotalEnergy+CLHEP::electron_mass_c2)
308 /(eTotalEnergy*eTotalEnergy);
309 G4double bg2 = eKineticEnergy*(eTotalEnergy+CLHEP::electron_mass_c2)
310 /(CLHEP::electron_mass_c2*CLHEP::electron_mass_c2);
311
312 static const G4double epsfactor = 2.*CLHEP::electron_mass_c2*
313 CLHEP::electron_mass_c2*CLHEP::Bohr_radius*CLHEP::Bohr_radius
314 /(CLHEP::hbarc*CLHEP::hbarc);
315 G4double eps = epsfactor*bg2/Z23;
316
317 if (eps<epsmin) sigma = 2.*eps*eps;
318 else if(eps<epsmax) sigma = G4Log(1.+2.*eps)-2.*eps/(1.+2.*eps);
319 else sigma = G4Log(2.*eps)-1.+1./eps;
320
321 sigma *= chargeSquare*atomicNumber*atomicNumber/(beta2*bg2);
322
323 // interpolate in AtomicNumber and beta2
324 G4double c1,c2,cc1;
325
326 // get bin number in Z
327 G4int iZ = 14;
328 // Loop checking, 03-Aug-2015, Vladimir Ivanchenko
329 while ((iZ>=0)&&(Zdat[iZ]>=atomicNumber)) { --iZ; }
330
331 iZ = std::min(std::max(iZ, 0), 13);
332
333 G4double ZZ1 = Zdat[iZ];
334 G4double ZZ2 = Zdat[iZ+1];
335 G4double ratZ = (atomicNumber-ZZ1)*(atomicNumber+ZZ1)/
336 ((ZZ2-ZZ1)*(ZZ2+ZZ1));
337
338 static const G4double Tlim = 10.*CLHEP::MeV;
339 static const G4double sigmafactor =
340 CLHEP::twopi*CLHEP::classic_electr_radius*CLHEP::classic_electr_radius;
341 static const G4double beta2lim = Tlim*(Tlim+2.*CLHEP::electron_mass_c2)/
342 ((Tlim+CLHEP::electron_mass_c2)*(Tlim+CLHEP::electron_mass_c2));
343 static const G4double bg2lim = Tlim*(Tlim+2.*CLHEP::electron_mass_c2)/
344 (CLHEP::electron_mass_c2*CLHEP::electron_mass_c2);
345
346 static const G4double sig0[15] = {
347 0.2672*CLHEP::barn, 0.5922*CLHEP::barn, 2.653*CLHEP::barn, 6.235*CLHEP::barn,
348 11.69*CLHEP::barn , 13.24*CLHEP::barn , 16.12*CLHEP::barn, 23.00*CLHEP::barn,
349 35.13*CLHEP::barn , 39.95*CLHEP::barn , 50.85*CLHEP::barn, 67.19*CLHEP::barn,
350 91.15*CLHEP::barn , 104.4*CLHEP::barn , 113.1*CLHEP::barn};
351
352 static const G4double Tdat[22] = {
353 100*CLHEP::eV, 200*CLHEP::eV, 400*CLHEP::eV, 700*CLHEP::eV,
354 1*CLHEP::keV, 2*CLHEP::keV, 4*CLHEP::keV, 7*CLHEP::keV,
355 10*CLHEP::keV, 20*CLHEP::keV, 40*CLHEP::keV, 70*CLHEP::keV,
356 100*CLHEP::keV, 200*CLHEP::keV, 400*CLHEP::keV, 700*CLHEP::keV,
357 1*CLHEP::MeV, 2*CLHEP::MeV, 4*CLHEP::MeV, 7*CLHEP::MeV,
358 10*CLHEP::MeV, 20*CLHEP::MeV};
359
360 if(eKineticEnergy <= Tlim)
361 {
362 // get bin number in T (beta2)
363 G4int iT = 21;
364 // Loop checking, 03-Aug-2015, Vladimir Ivanchenko
365 while ((iT>=0)&&(Tdat[iT]>=eKineticEnergy)) iT -= 1;
366
367 iT = std::min(std::max(iT, 0), 20);
368
369 // calculate betasquare values
370 G4double T = Tdat[iT];
371 G4double E = T + CLHEP::electron_mass_c2;
372 G4double b2small = T*(E+CLHEP::electron_mass_c2)/(E*E);
373
374 T = Tdat[iT+1];
375 E = T + CLHEP::electron_mass_c2;
376 G4double b2big = T*(E+CLHEP::electron_mass_c2)/(E*E);
377 G4double ratb2 = (beta2-b2small)/(b2big-b2small);
378
379 if (charge < 0.)
380 {
381 c1 = celectron[iZ][iT];
382 c2 = celectron[iZ+1][iT];
383 cc1 = c1+ratZ*(c2-c1);
384
385 c1 = celectron[iZ][iT+1];
386 c2 = celectron[iZ+1][iT+1];
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 }
397 G4double cc2 = c1+ratZ*(c2-c1);
398 sigma *= sigmafactor/(cc1+ratb2*(cc2-cc1));
399 }
400 else
401 {
402 c1 = bg2lim*sig0[iZ]*(1.+hecorr[iZ]*(beta2-beta2lim))/bg2;
403 c2 = bg2lim*sig0[iZ+1]*(1.+hecorr[iZ+1]*(beta2-beta2lim))/bg2;
404 if((atomicNumber >= ZZ1) && (atomicNumber <= ZZ2))
405 sigma = c1+ratZ*(c2-c1) ;
406 else if(atomicNumber < ZZ1)
407 sigma = atomicNumber*atomicNumber*c1/(ZZ1*ZZ1);
408 else if(atomicNumber > ZZ2)
409 sigma = atomicNumber*atomicNumber*c2/(ZZ2*ZZ2);
410 }
411 // low energy correction based on theory
412 sigma *= (1.+0.30/(1.+std::sqrt(1000.*eKineticEnergy)));
413
414 return sigma;
415}
416
417//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
418
419void G4UrbanMscModel::StartTracking(G4Track* track)
420{
421 SetParticle(track->GetDynamicParticle()->GetDefinition());
422 firstStep = true;
423 insideskin = false;
424 fr = facrange;
425 tlimit = tgeom = rangeinit = geombig;
426 smallstep = 1.e10;
427 stepmin = tlimitminfix;
428 tlimitmin = 10.*tlimitminfix;
429 rndmEngineMod = G4Random::getTheEngine();
430}
431
432//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
433
434G4double G4UrbanMscModel::ComputeTruePathLengthLimit(
435 const G4Track& track,
436 G4double& currentMinimalStep)
437{
438 tPathLength = currentMinimalStep;
439 const G4DynamicParticle* dp = track.GetDynamicParticle();
440
441 G4StepPoint* sp = track.GetStep()->GetPreStepPoint();
442 G4StepStatus stepStatus = sp->GetStepStatus();
443 couple = track.GetMaterialCutsCouple();
444 SetCurrentCouple(couple);
445 idx = couple->GetIndex();
446 currentKinEnergy = dp->GetKineticEnergy();
447 currentLogKinEnergy = dp->GetLogKineticEnergy();
448 currentRange = GetRange(particle,currentKinEnergy,couple,currentLogKinEnergy);
449 lambda0 = GetTransportMeanFreePath(particle,currentKinEnergy,
450 currentLogKinEnergy);
451 tPathLength = std::min(tPathLength,currentRange);
452 /*
453 G4cout << "G4Urban::StepLimit tPathLength= " << tPathLength
454 << " range= " <<currentRange<< " lambda= "<<lambda0
455 <<G4endl;
456 */
457 // extreme small step
458 if(tPathLength < tlimitminfix) {
459 latDisplasment = false;
460 return ConvertTrueToGeom(tPathLength, currentMinimalStep);
461 }
462
463 presafety = (stepStatus == fGeomBoundary) ? sp->GetSafety()
464 : ComputeSafety(sp->GetPosition(), tPathLength);
465
466 // stop here if small step or range is less than safety
467 if((tPathLength == currentRange && tPathLength < presafety) ||
468 tPathLength < tlimitminfix) {
469 latDisplasment = false;
470 return ConvertTrueToGeom(tPathLength, currentMinimalStep);
471 }
472
473 // upper limit for the straight line distance the particle can travel
474 // for electrons and positrons
475 G4double distance = (mass < masslimite)
476 ? currentRange*msc[idx]->doverra
477 // for muons, hadrons
478 : currentRange*msc[idx]->doverrb;
479
480 /*
481 G4cout << "G4Urban::StepLimit tPathLength= "
482 <<tPathLength<<" safety= " << presafety
483 << " range= " <<currentRange<< " lambda= "<<lambda0
484 << " Alg: " << steppingAlgorithm <<G4endl;
485 */
486 // far from geometry boundary
487 if(distance < presafety)
488 {
489 latDisplasment = false;
490 return ConvertTrueToGeom(tPathLength, currentMinimalStep);
491 }
492
493 latDisplasment = latDisplasmentbackup;
494 // ----------------------------------------------------------------
495 // distance to boundary
496 if (steppingAlgorithm == fUseDistanceToBoundary)
497 {
498 //compute geomlimit and presafety
499 geomlimit = ComputeGeomLimit(track, presafety, currentRange);
500 /*
501 G4cout << "G4Urban::Distance to boundary geomlimit= "
502 <<geomlimit<<" safety= " << presafety<<G4endl;
503 */
504
505 smallstep += 1.;
506 insideskin = false;
507
508 // initialisation at firs step and at the boundary
509 if(firstStep || (stepStatus == fGeomBoundary))
510 {
511 rangeinit = currentRange;
512 if(!firstStep) { smallstep = 1.; }
513
514 //stepmin ~ lambda_elastic
515 stepmin = ComputeStepmin();
516 skindepth = skin*stepmin;
517 tlimitmin = ComputeTlimitmin();
518 /*
519 G4cout << "rangeinit= " << rangeinit << " stepmin= " << stepmin
520 << " tlimitmin= " << tlimitmin << " geomlimit= "
521 << geomlimit <<G4endl;
522 */
523 // constraint from the geometry
524
525 if((geomlimit < geombig) && (geomlimit > geommin))
526 {
527 // geomlimit is a geometrical step length
528 // transform it to true path length (estimation)
529 if(lambda0 > geomlimit) {
530 geomlimit = -lambda0*G4Log(1.-geomlimit/lambda0)+tlimitmin;
531 }
532 tgeom = (stepStatus == fGeomBoundary)
533 ? geomlimit/facgeom : 2.*geomlimit/facgeom;
534 }
535 else
536 {
537 tgeom = geombig;
538 }
539 }
540
541 //step limit
542 tlimit = (currentRange > presafety) ?
543 std::max(facrange*rangeinit, facsafety*presafety) : currentRange;
544
545 //lower limit for tlimit
546 tlimit = std::min(std::max(tlimit,tlimitmin), tgeom);
547 /*
548 G4cout << "tgeom= " << tgeom << " geomlimit= " << geomlimit
549 << " tlimit= " << tlimit << " presafety= " << presafety << G4endl;
550 */
551 // shortcut
552 if((tPathLength < tlimit) && (tPathLength < presafety) &&
553 (smallstep > skin) && (tPathLength < geomlimit-0.999*skindepth))
554 {
555 return ConvertTrueToGeom(tPathLength, currentMinimalStep);
556 }
557
558 // step reduction near to boundary
559 if(smallstep <= skin)
560 {
561 tlimit = stepmin;
562 insideskin = true;
563 }
564 else if(geomlimit < geombig)
565 {
566 if(geomlimit > skindepth)
567 {
568 tlimit = std::min(tlimit, geomlimit-0.999*skindepth);
569 }
570 else
571 {
572 insideskin = true;
573 tlimit = std::min(tlimit, stepmin);
574 }
575 }
576
577 tlimit = std::max(tlimit, stepmin);
578
579 // randomise if not 'small' step and step determined by msc
580 tPathLength = (tlimit < tPathLength && smallstep > skin && !insideskin)
581 ? std::min(tPathLength, Randomizetlimit())
582 : std::min(tPathLength, tlimit);
583 }
584 // ----------------------------------------------------------------
585 // for simulation with or without magnetic field
586 // there no small step/single scattering at boundaries
587 else if(steppingAlgorithm == fUseSafety)
588 {
589 if(firstStep || (stepStatus == fGeomBoundary)) {
590 rangeinit = currentRange;
591 fr = facrange;
592 // stepping for e+/e- only (not for muons,hadrons)
593 if(mass < masslimite)
594 {
595 rangeinit = std::max(rangeinit, lambda0);
596 if(lambda0 > lambdalimit) {
597 fr *= (0.75+0.25*lambda0/lambdalimit);
598 }
599 }
600 //lower limit for tlimit
601 stepmin = ComputeStepmin();
602 tlimitmin = ComputeTlimitmin();
603 }
604
605 //step limit
606 tlimit = (currentRange > presafety) ?
607 std::max(fr*rangeinit, facsafety*presafety) : currentRange;
608
609 //lower limit for tlimit
610 tlimit = std::max(tlimit, tlimitmin);
611
612 // randomise if step determined by msc
613 tPathLength = (tlimit < tPathLength) ?
614 std::min(tPathLength, Randomizetlimit()) : tPathLength;
615 }
616 // ----------------------------------------------------------------
617 // for simulation with or without magnetic field
618 // there is small step/single scattering at boundaries
619 else if(steppingAlgorithm == fUseSafetyPlus)
620 {
621 if(firstStep || (stepStatus == fGeomBoundary)) {
622 rangeinit = currentRange;
623 fr = facrange;
624 if(mass < masslimite)
625 {
626 if(lambda0 > lambdalimit) {
627 fr *= (0.84+0.16*lambda0/lambdalimit);
628 }
629 }
630 //lower limit for tlimit
631 stepmin = ComputeStepmin();
632 tlimitmin = ComputeTlimitmin();
633 }
634 //step limit
635 tlimit = (currentRange > presafety) ?
636 std::max(fr*rangeinit, facsafety*presafety) : currentRange;
637
638 //lower limit for tlimit
639 tlimit = std::max(tlimit, tlimitmin);
640
641 // condition for tPathLength from drr and finalr
642 if(currentRange > finalr) {
643 G4double tmax = drr*currentRange+
644 finalr*(1.-drr)*(2.-finalr/currentRange);
645 tPathLength = std::min(tPathLength,tmax);
646 }
647
648 // randomise if step determined by msc
649 tPathLength = (tlimit < tPathLength) ?
650 std::min(tPathLength, Randomizetlimit()) : tPathLength;
651 }
652
653 // ----------------------------------------------------------------
654 // simple step limitation
655 else
656 {
657 if (stepStatus == fGeomBoundary)
658 {
659 tlimit = (currentRange > lambda0)
660 ? facrange*currentRange : facrange*lambda0;
661 tlimit = std::max(tlimit, tlimitmin);
662 }
663 // randomise if step determined by msc
664 tPathLength = (tlimit < tPathLength) ?
665 std::min(tPathLength, Randomizetlimit()) : tPathLength;
666 }
667
668 // ----------------------------------------------------------------
669 firstStep = false;
670 return ConvertTrueToGeom(tPathLength, currentMinimalStep);
671}
672
673//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
674
675G4double G4UrbanMscModel::ComputeGeomPathLength(G4double)
676{
677 lambdaeff = lambda0;
678 par1 = -1. ;
679 par2 = par3 = 0. ;
680
681 // this correction needed to run MSC with eIoni and eBrem inactivated
682 // and makes no harm for a normal run
683 tPathLength = std::min(tPathLength,currentRange);
684
685 // do the true -> geom transformation
686 zPathLength = tPathLength;
687
688 // z = t for very small tPathLength
689 if(tPathLength < tlimitminfix2) return zPathLength;
690
691 /*
692 G4cout << "ComputeGeomPathLength: tpl= " << tPathLength
693 << " R= " << currentRange << " L0= " << lambda0
694 << " E= " << currentKinEnergy << " "
695 << particle->GetParticleName() << G4endl;
696 */
697 G4double tau = tPathLength/lambda0 ;
698
699 if ((tau <= tausmall) || insideskin) {
700 zPathLength = std::min(tPathLength, lambda0);
701
702 } else if (tPathLength < currentRange*dtrl) {
703 zPathLength = (tau < taulim) ? tPathLength*(1.-0.5*tau)
704 : lambda0*(1.-G4Exp(-tau));
705
706 } else if(currentKinEnergy < mass || tPathLength == currentRange) {
707 par1 = 1./currentRange;
708 par2 = currentRange/lambda0;
709 par3 = 1.+par2;
710 if(tPathLength < currentRange) {
711 zPathLength =
712 (1.-G4Exp(par3*G4Log(1.-tPathLength/currentRange)))/(par1*par3);
713 } else {
714 zPathLength = 1./(par1*par3);
715 }
716
717 } else {
718 G4double rfin = std::max(currentRange-tPathLength, 0.01*currentRange);
719 G4double T1 = GetEnergy(particle,rfin,couple);
720 G4double lambda1 = GetTransportMeanFreePath(particle,T1);
721
722 par1 = (lambda0-lambda1)/(lambda0*tPathLength);
723 //G4cout << "par1= " << par1 << " L1= " << lambda1 << G4endl;
724 par2 = 1./(par1*lambda0);
725 par3 = 1.+par2;
726 zPathLength = (1.-G4Exp(par3*G4Log(lambda1/lambda0)))/(par1*par3);
727 }
728
729 zPathLength = std::min(zPathLength, lambda0);
730 //G4cout<< "zPathLength= "<< zPathLength<< " L0= " << lambda0 << G4endl;
731 return zPathLength;
732}
733
734//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
735
736G4double G4UrbanMscModel::ComputeTrueStepLength(G4double geomStepLength)
737{
738 // step defined other than transportation
739 if(geomStepLength == zPathLength) {
740 //G4cout << "Urban::ComputeTrueLength: tPathLength= " << tPathLength
741 // << " step= " << geomStepLength << " *** " << G4endl;
742 return tPathLength;
743 }
744
745 zPathLength = geomStepLength;
746
747 // t = z for very small step
748 if(geomStepLength < tlimitminfix2) {
749 tPathLength = geomStepLength;
750
751 // recalculation
752 } else {
753
754 G4double tlength = geomStepLength;
755 if((geomStepLength > lambda0*tausmall) && !insideskin) {
756
757 if(par1 < 0.) {
758 tlength = -lambda0*G4Log(1.-geomStepLength/lambda0) ;
759 } else {
760 const G4double par4 = par1*par3;
761 if(par4*geomStepLength < 1.) {
762 tlength = (1.-G4Exp(G4Log(1.-par4*geomStepLength)/par3))/par1;
763 } else {
764 tlength = currentRange;
765 }
766 }
767
768 if(tlength < geomStepLength) { tlength = geomStepLength; }
769 else if(tlength > tPathLength) { tlength = tPathLength; }
770 }
771 tPathLength = tlength;
772 }
773 //G4cout << "Urban::ComputeTrueLength: tPathLength= " << tPathLength
774 // << " step= " << geomStepLength << " &&& " << G4endl;
775
776 return tPathLength;
777}
778
779//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
780
781G4ThreeVector&
782G4UrbanMscModel::SampleScattering(const G4ThreeVector& oldDirection,
783 G4double /*safety*/)
784{
785 fDisplacement.set(0.0,0.0,0.0);
786 if(tPathLength >= currentRange) { return fDisplacement; }
787
788 G4double kinEnergy = currentKinEnergy;
789 if (tPathLength > currentRange*dtrl) {
790 kinEnergy = GetEnergy(particle,currentRange-tPathLength,couple);
791 } else if(tPathLength > currentRange*0.01) {
792 kinEnergy -= tPathLength*GetDEDX(particle,currentKinEnergy,couple,
793 currentLogKinEnergy);
794 }
795
796 if((tPathLength <= tlimitminfix) || (tPathLength < tausmall*lambda0) ||
797 (kinEnergy <= CLHEP::eV)) { return fDisplacement; }
798
799 G4double cth = SampleCosineTheta(tPathLength,kinEnergy);
800
801 // protection against 'bad' cth values
802 if(std::abs(cth) >= 1.0) { return fDisplacement; }
803
804 G4double sth = std::sqrt((1.0 - cth)*(1.0 + cth));
805 G4double phi = CLHEP::twopi*rndmEngineMod->flat();
806 G4ThreeVector newDirection(sth*std::cos(phi),sth*std::sin(phi),cth);
807 newDirection.rotateUz(oldDirection);
808
809 fParticleChange->ProposeMomentumDirection(newDirection);
810 /*
811 G4cout << "G4UrbanMscModel::SampleSecondaries: e(MeV)= " << kineticEnergy
812 << " sinTheta= " << sth << " safety(mm)= " << safety
813 << " trueStep(mm)= " << tPathLength
814 << " geomStep(mm)= " << zPathLength
815 << G4endl;
816 */
817
818 if (latDisplasment && currentTau >= tausmall) {
819 if(dispAlg96) { SampleDisplacement(sth, phi); }
820 else { SampleDisplacementNew(cth, phi); }
821 fDisplacement.rotateUz(oldDirection);
822 }
823 return fDisplacement;
824}
825
826//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
827
828G4double G4UrbanMscModel::SampleCosineTheta(G4double trueStepLength,
829 G4double kinEnergy)
830{
831 G4double cth = 1.0;
832 G4double tau = trueStepLength/lambda0;
833
834 // mean tau value
835 if(currentKinEnergy != kinEnergy) {
836 G4double lambda1 = GetTransportMeanFreePath(particle, kinEnergy);
837 if(std::abs(lambda1 - lambda0) > lambda0*0.01 && lambda1 > 0.) {
838 tau = trueStepLength*G4Log(lambda0/lambda1)/(lambda0-lambda1);
839 }
840 }
841
842 currentTau = tau;
843 lambdaeff = trueStepLength/currentTau;
844 currentRadLength = couple->GetMaterial()->GetRadlen();
845
846 if (tau >= taubig) { cth = -1.+2.*rndmEngineMod->flat(); }
847 else if (tau >= tausmall) {
848 static const G4double numlim = 0.01;
849 static const G4double onethird = 1./3.;
850 if(tau < numlim) {
851 xmeanth = 1.0 - tau*(1.0 - 0.5*tau);
852 x2meanth= 1.0 - tau*(5.0 - 6.25*tau)*onethird;
853 } else {
854 xmeanth = G4Exp(-tau);
855 x2meanth = (1.+2.*G4Exp(-2.5*tau))*onethird;
856 }
857
858 // too large step of low-energy particle
859 G4double relloss = 1. - kinEnergy/currentKinEnergy;
860 static const G4double rellossmax= 0.50;
861 if(relloss > rellossmax) {
862 return SimpleScattering();
863 }
864 // is step extreme small ?
865 G4bool extremesmallstep = false;
866 G4double tsmall = std::min(tlimitmin,lambdalimit);
867
868 G4double theta0;
869 if(trueStepLength > tsmall) {
870 theta0 = ComputeTheta0(trueStepLength,kinEnergy);
871 } else {
872 theta0 = std::sqrt(trueStepLength/tsmall)
873 *ComputeTheta0(tsmall,kinEnergy);
874 extremesmallstep = true;
875 }
876
877 static const G4double onesixth = 1./6.;
878 static const G4double one12th = 1./12.;
879 static const G4double theta0max = CLHEP::pi*onesixth;
880
881 // protection for very small angles
882 G4double theta2 = theta0*theta0;
883
884 if(theta2 < tausmall) { return cth; }
885 if(theta0 > theta0max) { return SimpleScattering(); }
886
887 G4double x = theta2*(1.0 - theta2*one12th);
888 if(theta2 > numlim) {
889 G4double sth = 2*std::sin(0.5*theta0);
890 x = sth*sth;
891 }
892
893 // parameter for tail
894 G4double ltau = G4Log(tau);
895 G4double u = !extremesmallstep ? G4Exp(ltau*onesixth)
896 : G4Exp(G4Log(tsmall/lambda0)*onesixth);
897
898 G4double xx = G4Log(lambdaeff/currentRadLength);
899 G4double xsi = msc[idx]->coeffc1 +
900 u*(msc[idx]->coeffc2+msc[idx]->coeffc3*u)+msc[idx]->coeffc4*xx;
901
902 // tail should not be too big
903 xsi = std::max(xsi, 1.9);
904 /*
905 if(KineticEnergy > 20*MeV && xsi < 1.6) {
906 G4cout << "G4UrbanMscModel::SampleCosineTheta: E(GeV)= "
907 << KineticEnergy/GeV
908 << " !!** c= " << xsi
909 << " **!! length(mm)= " << trueStepLength << " Zeff= " << Zeff
910 << " " << couple->GetMaterial()->GetName()
911 << " tau= " << tau << G4endl;
912 }
913 */
914
915 G4double c = xsi;
916
917 if(std::abs(c-3.) < 0.001) { c = 3.001; }
918 else if(std::abs(c-2.) < 0.001) { c = 2.001; }
919
920 G4double c1 = c-1.;
921 G4double ea = G4Exp(-xsi);
922 G4double eaa = 1.-ea ;
923 G4double xmean1 = 1.-(1.-(1.+xsi)*ea)*x/eaa;
924 G4double x0 = 1. - xsi*x;
925
926 // G4cout << " xmean1= " << xmean1 << " xmeanth= " << xmeanth << G4endl;
927
928 if(xmean1 <= 0.999*xmeanth) { return SimpleScattering(); }
929
930 //from continuity of derivatives
931 G4double b = 1.+(c-xsi)*x;
932
933 G4double b1 = b+1.;
934 G4double bx = c*x;
935
936 G4double eb1 = G4Exp(G4Log(b1)*c1);
937 G4double ebx = G4Exp(G4Log(bx)*c1);
938 G4double d = ebx/eb1;
939
940 G4double xmean2 = (x0 + d - (bx - b1*d)/(c-2.))/(1. - d);
941
942 G4double f1x0 = ea/eaa;
943 G4double f2x0 = c1/(c*(1. - d));
944 G4double prob = f2x0/(f1x0+f2x0);
945
946 G4double qprob = xmeanth/(prob*xmean1+(1.-prob)*xmean2);
947
948 // sampling of costheta
949 //G4cout << "c= " << c << " qprob= " << qprob << " eb1= " << eb1
950 // << " c1= " << c1 << " b1= " << b1 << " bx= " << bx << " eb1= " << eb1
951 // << G4endl;
952 rndmEngineMod->flatArray(2, rndmarray);
953 if(rndmarray[0] < qprob)
954 {
955 G4double var = 0;
956 if(rndmarray[1] < prob) {
957 cth = 1.+G4Log(ea+rndmEngineMod->flat()*eaa)*x;
958 } else {
959 var = (1.0 - d)*rndmEngineMod->flat();
960 if(var < numlim*d) {
961 var /= (d*c1);
962 cth = -1.0 + var*(1.0 - 0.5*var*c)*(2. + (c - xsi)*x);
963 } else {
964 cth = 1. + x*(c - xsi - c*G4Exp(-G4Log(var + d)/c1));
965 }
966 }
967 } else {
968 cth = -1.+2.*rndmarray[1];
969 }
970 }
971 return cth;
972}
973
974//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
975
976G4double G4UrbanMscModel::ComputeTheta0(G4double trueStepLength,
977 G4double kinEnergy)
978{
979 // for all particles take the width of the central part
980 // from a parametrization similar to the Highland formula
981 // ( Highland formula: Particle Physics Booklet, July 2002, eq. 26.10)
982 G4double invbetacp = (kinEnergy+mass)/(kinEnergy*(kinEnergy+2.*mass));
983 if(currentKinEnergy != kinEnergy) {
984 invbetacp = std::sqrt(invbetacp*(currentKinEnergy+mass)/
985 (currentKinEnergy*(currentKinEnergy+2.*mass)));
986 }
987 G4double y = trueStepLength/currentRadLength;
988
989 if(fPosiCorrection && particle == positron)
990 {
991 static const G4double xl= 0.6;
992 static const G4double xh= 0.9;
993 static const G4double e = 113.0;
994 G4double corr;
995
996 G4double tau = std::sqrt(currentKinEnergy*kinEnergy)/mass;
997 G4double x = std::sqrt(tau*(tau+2.)/((tau+1.)*(tau+1.)));
998 G4double a = msc[idx]->posa;
999 G4double b = msc[idx]->posb;
1000 G4double c = msc[idx]->posc;
1001 G4double d = msc[idx]->posd;
1002 if(x < xl) {
1003 corr = a*(1.-G4Exp(-b*x));
1004 } else if(x > xh) {
1005 corr = c+d*G4Exp(e*(x-1.));
1006 } else {
1007 G4double yl = a*(1.-G4Exp(-b*xl));
1008 G4double yh = c+d*G4Exp(e*(xh-1.));
1009 G4double y0 = (yh-yl)/(xh-xl);
1010 G4double y1 = yl-y0*xl;
1011 corr = y0*x+y1;
1012 }
1013 //==================================================================
1014 y *= corr*msc[idx]->pose;
1015 }
1016
1017 static const G4double c_highland = 13.6*CLHEP::MeV;
1018 G4double theta0 = c_highland*std::abs(charge)*std::sqrt(y)*invbetacp;
1019
1020 // correction factor from e- scattering data
1021 theta0 *= (msc[idx]->coeffth1+msc[idx]->coeffth2*G4Log(y));
1022 return theta0;
1023}
1024
1025//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
1026
1027void G4UrbanMscModel::SampleDisplacement(G4double, G4double phi)
1028{
1029 // simple and fast sampling
1030 // based on single scattering results
1031 // u = r/rmax : mean value
1032
1033 G4double rmax = std::sqrt((tPathLength-zPathLength)*(tPathLength+zPathLength));
1034 if(rmax > 0.)
1035 {
1036 G4double r = 0.73*rmax;
1037
1038 // simple distribution for v=Phi-phi=psi ~exp(-beta*v)
1039 // beta determined from the requirement that distribution should give
1040 // the same mean value than that obtained from the ss simulation
1041
1042 static const G4double cbeta = 2.160;
1043 static const G4double cbeta1 = 1. - G4Exp(-cbeta*CLHEP::pi);
1044 rndmEngineMod->flatArray(2, rndmarray);
1045 G4double psi = -G4Log(1. - rndmarray[0]*cbeta1)/cbeta;
1046 G4double Phi = (rndmarray[1] < 0.5) ? phi+psi : phi-psi;
1047 fDisplacement.set(r*std::cos(Phi),r*std::sin(Phi),0.0);
1048 }
1049}
1050
1051//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
1052
1053void G4UrbanMscModel::SampleDisplacementNew(G4double, G4double phi)
1054{
1055 // simple and fast sampling
1056 // based on single scattering results
1057 // u = (r/rmax)**2 : distribution from ss simulations
1058 const G4double eps = 1.e-3;
1059 const G4double rmax =
1060 std::sqrt((tPathLength-zPathLength)*(tPathLength+zPathLength));
1061
1062 if(rmax > 0.)
1063 {
1064 const G4double x0 = 0.73 ;
1065 const G4double alpha = G4Log(7.33)/x0 ;
1066 const G4double a1 = 1.-x0 ;
1067 const G4double a2 = 1.-G4Exp(-alpha*x0) ;
1068 const G4double a3 = G4Exp(alpha*x0)-1. ;
1069 const G4double w1 = 2.*a2/(alpha*a1+2.*a2) ;
1070
1071 G4double r, sqx;
1072 if (rmax/currentRange < eps)
1073 {
1074 r = 0.73*rmax ;
1075 sqx = 1.;
1076 }
1077 else
1078 {
1079 rndmEngineMod->flatArray(2,rndmarray);
1080 const G4double x = (rndmarray[0] < w1) ? G4Log(1. + a3*rndmarray[1])/alpha :
1081 1. - a1*std::sqrt(1.-rndmarray[1]);
1082
1083 sqx = std::sqrt(x);
1084 r = sqx*rmax;
1085 }
1086 // Gaussian distribution for Phi-phi=psi
1087 const G4double sigma = 0.1+0.9*sqx;
1088 const G4double psi = G4RandGauss::shoot(0.,sigma);
1089 const G4double Phi = phi+psi;
1090 fDisplacement.set(r*std::cos(Phi), r*std::sin(Phi), 0.0);
1091 }
1092}
1093
1094//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
1095
1096void G4UrbanMscModel::InitialiseModelCache()
1097{
1098 // it is assumed, that for the second run only addition
1099 // of a new G4MaterialCutsCouple is possible
1100 auto theCoupleTable = G4ProductionCutsTable::GetProductionCutsTable();
1101 std::size_t numOfCouples = theCoupleTable->GetTableSize();
1102 if(numOfCouples != msc.size()) { msc.resize(numOfCouples, nullptr); }
1103
1104 for(G4int j=0; j<(G4int)numOfCouples; ++j) {
1105 auto aCouple = theCoupleTable->GetMaterialCutsCouple(j);
1106
1107 // new couple
1108 msc[j] = new mscData();
1109 G4double Zeff = aCouple->GetMaterial()->GetIonisation()->GetZeffective();
1110 G4double sqrz = std::sqrt(Zeff);
1111 msc[j]->sqrtZ = sqrz;
1112 // parameterisation of step limitation
1113 msc[j]->factmin = dispAlg96 ? 0.001 : 0.001/(1.+0.028*sqrz);
1114 G4double lnZ = G4Log(Zeff);
1115 // correction in theta0 formula
1116 G4double w = G4Exp(lnZ/6.);
1117 G4double facz = 0.990395+w*(-0.168386+w*0.093286);
1118 msc[j]->coeffth1 = facz*(1. - 8.7780e-2/Zeff);
1119 msc[j]->coeffth2 = facz*(4.0780e-2 + 1.7315e-4*Zeff);
1120
1121 // tail parameters
1122 G4double Z13 = w*w;
1123 msc[j]->coeffc1 = 2.3785 - Z13*(4.1981e-1 - Z13*6.3100e-2);
1124 msc[j]->coeffc2 = 4.7526e-1 + Z13*(1.7694 - Z13*3.3885e-1);
1125 msc[j]->coeffc3 = 2.3683e-1 - Z13*(1.8111 - Z13*3.2774e-1);
1126 msc[j]->coeffc4 = 1.7888e-2 + Z13*(1.9659e-2 - Z13*2.6664e-3);
1127
1128 msc[j]->Z23 = Z13*Z13;
1129
1130 msc[j]->stepmina = 27.725/(1.+0.203*Zeff);
1131 msc[j]->stepminb = 6.152/(1.+0.111*Zeff);
1132
1133 // 21.07.2020
1134 msc[j]->doverra = 9.6280e-1 - 8.4848e-2*msc[j]->sqrtZ + 4.3769e-3*Zeff;
1135
1136 // 06.10.2020
1137 // msc[j]->doverra = 7.7024e-1 - 6.7878e-2*msc[j]->sqrtZ + 3.5015e-3*Zeff;
1138 msc[j]->doverrb = 1.15 - 9.76e-4*Zeff;
1139
1140 // corrections for e+
1141 msc[j]->posa = 0.994-4.08e-3*Zeff;
1142 msc[j]->posb = 7.16+(52.6+365./Zeff)/Zeff;
1143 msc[j]->posc = 1.000-4.47e-3*Zeff;
1144 msc[j]->posd = 1.21e-3*Zeff;
1145 msc[j]->pose = 1.+Zeff*(1.84035e-4*Zeff-1.86427e-2)+0.41125;
1146 }
1147}
1148
1149//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
G4Exp
G4double G4Exp(G4double initial_x)
Exponential Function double precision.
Definition G4Exp.hh:180
G4Log
G4double G4Log(G4double x)
Definition G4Log.hh:227
fUseSafety
@ fUseSafety
Definition G4MscStepLimitType.hh:49
fUseSafetyPlus
@ fUseSafetyPlus
Definition G4MscStepLimitType.hh:50
fUseDistanceToBoundary
@ fUseDistanceToBoundary
Definition G4MscStepLimitType.hh:51
G4StepStatus
G4StepStatus
Definition G4StepStatus.hh:40
fGeomBoundary
@ fGeomBoundary
Definition G4StepStatus.hh:43
G4MUTEX_INITIALIZER
#define G4MUTEX_INITIALIZER
Definition G4Threading.hh:85
G4Mutex
std::mutex G4Mutex
Definition G4Threading.hh:81
G4double
double G4double
Definition G4Types.hh:83
G4bool
bool G4bool
Definition G4Types.hh:86
G4int
int G4int
Definition G4Types.hh:85
CLHEP::Hep3Vector::set
void set(double x, double y, double z)
CLHEP::Hep3Vector::rotateUz
Hep3Vector & rotateUz(const Hep3Vector &)
Definition ThreeVector.cc:33
CLHEP::HepRandomEngine::flat
virtual double flat()=0
CLHEP::HepRandomEngine::flatArray
virtual void flatArray(const int size, double *vect)=0
G4DynamicParticle::GetLogKineticEnergy
G4double GetLogKineticEnergy() const
G4DynamicParticle::GetDefinition
G4ParticleDefinition * GetDefinition() const
G4DynamicParticle::GetKineticEnergy
G4double GetKineticEnergy() const
G4EmParameters::LateralDisplacementAlg96
G4bool LateralDisplacementAlg96() const
Definition G4EmParameters.cc:337
G4EmParameters::Instance
static G4EmParameters * Instance()
Definition G4EmParameters.cc:70
G4EmParameters::MscPositronCorrection
G4bool MscPositronCorrection() const
Definition G4EmParameters.cc:520
G4MaterialCutsCouple::GetMaterial
const G4Material * GetMaterial() const
Definition G4MaterialCutsCouple.hh:166
G4Material::GetRadlen
G4double GetRadlen() const
Definition G4Material.hh:206
G4ParticleChangeForMSC::ProposeMomentumDirection
void ProposeMomentumDirection(const G4ThreeVector &Pfinal)
Definition G4ParticleChangeForMSC.hh:78
G4Positron::Positron
static G4Positron * Positron()
Definition G4Positron.cc:90
G4Pow::GetInstance
static G4Pow * GetInstance()
Definition G4Pow.cc:41
G4Pow::Z23
G4double Z23(G4int Z) const
Definition G4Pow.hh:125
G4ProductionCutsTable::GetProductionCutsTable
static G4ProductionCutsTable * GetProductionCutsTable()
Definition G4ProductionCutsTable.cc:58
G4Step::GetPreStepPoint
G4StepPoint * GetPreStepPoint() const
G4Track::GetDynamicParticle
const G4DynamicParticle * GetDynamicParticle() const
G4Track::GetMaterialCutsCouple
const G4MaterialCutsCouple * GetMaterialCutsCouple() const
G4Track::GetStep
const G4Step * GetStep() const
G4UrbanMscModel::SampleScattering
G4ThreeVector & SampleScattering(const G4ThreeVector &, G4double safety) override
Definition G4UrbanMscModel.cc:782
G4UrbanMscModel::ComputeTrueStepLength
G4double ComputeTrueStepLength(G4double geomStepLength) override
Definition G4UrbanMscModel.cc:736
G4UrbanMscModel::ComputeTheta0
G4double ComputeTheta0(G4double truePathLength, G4double KineticEnergy)
Definition G4UrbanMscModel.cc:976
G4UrbanMscModel::StartTracking
void StartTracking(G4Track *) override
Definition G4UrbanMscModel.cc:419
G4UrbanMscModel::~G4UrbanMscModel
~G4UrbanMscModel() override
Definition G4UrbanMscModel.cc:124
G4UrbanMscModel::G4UrbanMscModel
G4UrbanMscModel(const G4String &nam="UrbanMsc")
Definition G4UrbanMscModel.cc:81
G4UrbanMscModel::Initialise
void Initialise(const G4ParticleDefinition *, const G4DataVector &) override
Definition G4UrbanMscModel.cc:134
G4UrbanMscModel::ComputeGeomPathLength
G4double ComputeGeomPathLength(G4double truePathLength) override
Definition G4UrbanMscModel.cc:675
G4UrbanMscModel::ComputeCrossSectionPerAtom
G4double ComputeCrossSectionPerAtom(const G4ParticleDefinition *particle, G4double KineticEnergy, G4double AtomicNumber, G4double AtomicWeight=0., G4double cut=0., G4double emax=DBL_MAX) override
Definition G4UrbanMscModel.cc:173
G4UrbanMscModel::ComputeTruePathLengthLimit
G4double ComputeTruePathLengthLimit(const G4Track &track, G4double &currentMinimalStep) override
Definition G4UrbanMscModel.cc:434
G4VEmModel::SetCurrentCouple
void SetCurrentCouple(const G4MaterialCutsCouple *)
Definition G4VEmModel.hh:467
G4VEmModel::IsLocked
G4bool IsLocked() const
Definition G4VEmModel.hh:841
G4VMscModel::dtrl
G4double dtrl
Definition G4VMscModel.hh:203
G4VMscModel::GetDEDX
G4double GetDEDX(const G4ParticleDefinition *part, G4double kineticEnergy, const G4MaterialCutsCouple *couple)
Definition G4VMscModel.cc:158
G4VMscModel::facrange
G4double facrange
Definition G4VMscModel.hh:199
G4VMscModel::ComputeGeomLimit
G4double ComputeGeomLimit(const G4Track &, G4double &presafety, G4double limit)
Definition G4VMscModel.hh:296
G4VMscModel::skin
G4double skin
Definition G4VMscModel.hh:202
G4VMscModel::GetTransportMeanFreePath
G4double GetTransportMeanFreePath(const G4ParticleDefinition *part, G4double kinEnergy)
Definition G4VMscModel.hh:325
G4VMscModel::GetParticleChangeForMSC
G4ParticleChangeForMSC * GetParticleChangeForMSC(const G4ParticleDefinition *p=nullptr)
Definition G4VMscModel.cc:77
G4VMscModel::GetEnergy
G4double GetEnergy(const G4ParticleDefinition *part, G4double range, const G4MaterialCutsCouple *couple)
Definition G4VMscModel.cc:223
G4VMscModel::GetRange
G4double GetRange(const G4ParticleDefinition *part, G4double kineticEnergy, const G4MaterialCutsCouple *couple)
Definition G4VMscModel.cc:188
G4VMscModel::lambdalimit
G4double lambdalimit
Definition G4VMscModel.hh:204
G4VMscModel::steppingAlgorithm
G4MscStepLimitType steppingAlgorithm
Definition G4VMscModel.hh:209
G4VMscModel::ConvertTrueToGeom
G4double ConvertTrueToGeom(G4double &tLength, G4double &gLength)
Definition G4VMscModel.hh:286
G4VMscModel::latDisplasment
G4bool latDisplasment
Definition G4VMscModel.hh:212
G4VMscModel::ComputeSafety
G4double ComputeSafety(const G4ThreeVector &position, G4double limit=DBL_MAX)
Definition G4VMscModel.hh:278
G4VMscModel::facsafety
G4double facsafety
Definition G4VMscModel.hh:201
G4VMscModel::fDisplacement
G4ThreeVector fDisplacement
Definition G4VMscModel.hh:208
G4VMscModel::InitialiseParameters
void InitialiseParameters(const G4ParticleDefinition *)
Definition G4VMscModel.cc:115
G4VMscModel::facgeom
G4double facgeom
Definition G4VMscModel.hh:200
LOG_EKIN_MIN
#define LOG_EKIN_MIN
Definition templates.hh:98
G4lrint
int G4lrint(double ad)
Definition templates.hh:134