Geant4 9.6.0
Toolkit for the simulation of the passage of particles through matter
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Public Member Functions | Protected Member Functions | Protected Attributes | List of all members
G4BoldyshevTripletModel Class Reference

#include <G4BoldyshevTripletModel.hh>

+ Inheritance diagram for G4BoldyshevTripletModel:

Public Member Functions

 G4BoldyshevTripletModel (const G4ParticleDefinition *p=0, const G4String &nam="BoldyshevTriplet")
 
virtual ~G4BoldyshevTripletModel ()
 
virtual void Initialise (const G4ParticleDefinition *, const G4DataVector &)
 
virtual G4double ComputeCrossSectionPerAtom (const G4ParticleDefinition *, G4double kinEnergy, G4double Z, G4double A=0, G4double cut=0, G4double emax=DBL_MAX)
 
virtual void SampleSecondaries (std::vector< G4DynamicParticle * > *, const G4MaterialCutsCouple *, const G4DynamicParticle *, G4double tmin, G4double maxEnergy)
 
- Public Member Functions inherited from G4VEmModel
 G4VEmModel (const G4String &nam)
 
virtual ~G4VEmModel ()
 
virtual void Initialise (const G4ParticleDefinition *, const G4DataVector &)=0
 
virtual void SampleSecondaries (std::vector< G4DynamicParticle * > *, const G4MaterialCutsCouple *, const G4DynamicParticle *, G4double tmin=0.0, G4double tmax=DBL_MAX)=0
 
virtual G4double ComputeDEDXPerVolume (const G4Material *, const G4ParticleDefinition *, G4double kineticEnergy, G4double cutEnergy=DBL_MAX)
 
virtual G4double CrossSectionPerVolume (const G4Material *, const G4ParticleDefinition *, G4double kineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)
 
virtual G4double ComputeCrossSectionPerAtom (const G4ParticleDefinition *, G4double kinEnergy, G4double Z, G4double A=0., G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)
 
virtual G4double ChargeSquareRatio (const G4Track &)
 
virtual G4double GetChargeSquareRatio (const G4ParticleDefinition *, const G4Material *, G4double kineticEnergy)
 
virtual G4double GetParticleCharge (const G4ParticleDefinition *, const G4Material *, G4double kineticEnergy)
 
virtual void StartTracking (G4Track *)
 
virtual void CorrectionsAlongStep (const G4MaterialCutsCouple *, const G4DynamicParticle *, G4double &eloss, G4double &niel, G4double length)
 
virtual G4double Value (const G4MaterialCutsCouple *, const G4ParticleDefinition *, G4double kineticEnergy)
 
virtual G4double MinPrimaryEnergy (const G4Material *, const G4ParticleDefinition *)
 
virtual void SetupForMaterial (const G4ParticleDefinition *, const G4Material *, G4double kineticEnergy)
 
virtual void DefineForRegion (const G4Region *)
 
void InitialiseElementSelectors (const G4ParticleDefinition *, const G4DataVector &)
 
G4double ComputeDEDX (const G4MaterialCutsCouple *, const G4ParticleDefinition *, G4double kineticEnergy, G4double cutEnergy=DBL_MAX)
 
G4double CrossSection (const G4MaterialCutsCouple *, const G4ParticleDefinition *, G4double kineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)
 
G4double ComputeMeanFreePath (const G4ParticleDefinition *, G4double kineticEnergy, const G4Material *, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)
 
G4double ComputeCrossSectionPerAtom (const G4ParticleDefinition *, const G4Element *, G4double kinEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)
 
G4int SelectIsotopeNumber (const G4Element *)
 
const G4Element * SelectRandomAtom (const G4MaterialCutsCouple *, const G4ParticleDefinition *, G4double kineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)
 
const G4Element * SelectRandomAtom (const G4Material *, const G4ParticleDefinition *, G4double kineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)
 
void SetParticleChange (G4VParticleChange *, G4VEmFluctuationModel *f=0)
 
void SetCrossSectionTable (G4PhysicsTable *)
 
G4PhysicsTable * GetCrossSectionTable ()
 
G4VEmFluctuationModel * GetModelOfFluctuations ()
 
G4VEmAngularDistribution * GetAngularDistribution ()
 
void SetAngularDistribution (G4VEmAngularDistribution *)
 
G4double HighEnergyLimit () const
 
G4double LowEnergyLimit () const
 
G4double HighEnergyActivationLimit () const
 
G4double LowEnergyActivationLimit () const
 
G4double PolarAngleLimit () const
 
G4double SecondaryThreshold () const
 
G4bool LPMFlag () const
 
G4bool DeexcitationFlag () const
 
G4bool ForceBuildTableFlag () const
 
void SetHighEnergyLimit (G4double)
 
void SetLowEnergyLimit (G4double)
 
void SetActivationHighEnergyLimit (G4double)
 
void SetActivationLowEnergyLimit (G4double)
 
G4bool IsActive (G4double kinEnergy)
 
void SetPolarAngleLimit (G4double)
 
void SetSecondaryThreshold (G4double)
 
void SetLPMFlag (G4bool val)
 
void SetDeexcitationFlag (G4bool val)
 
void ForceBuildTable (G4bool val)
 
G4double MaxSecondaryKinEnergy (const G4DynamicParticle *dynParticle)
 
const G4String & GetName () const
 
void SetCurrentCouple (const G4MaterialCutsCouple *)
 
const G4Element * GetCurrentElement () const
 

Protected Member Functions

G4double GetMeanFreePath (const G4Track &aTrack, G4double previousStepSize, G4ForceCondition *condition)
 
- Protected Member Functions inherited from G4VEmModel
G4ParticleChangeForLoss * GetParticleChangeForLoss ()
 
G4ParticleChangeForGamma * GetParticleChangeForGamma ()
 
virtual G4double MaxSecondaryEnergy (const G4ParticleDefinition *, G4double kineticEnergy)
 
const G4MaterialCutsCouple * CurrentCouple () const
 
void SetCurrentElement (const G4Element *)
 

Protected Attributes

G4ParticleChangeForGamma * fParticleChange
 
- Protected Attributes inherited from G4VEmModel
G4VParticleChange * pParticleChange
 
G4PhysicsTable * xSectionTable
 
const std::vector< G4double > * theDensityFactor
 
const std::vector< G4int > * theDensityIdx
 

Detailed Description

Definition at line 42 of file G4BoldyshevTripletModel.hh.

Constructor & Destructor Documentation

◆ G4BoldyshevTripletModel()

G4BoldyshevTripletModel::G4BoldyshevTripletModel ( const G4ParticleDefinition *  p = 0,
const G4String &  nam = "BoldyshevTriplet" 
)

Definition at line 47 of file G4BoldyshevTripletModel.cc.

49 :G4VEmModel(nam),fParticleChange(0),smallEnergy(4.*MeV),isInitialised(false),
50 crossSectionHandler(0),meanFreePathTable(0)
51{
52 lowEnergyLimit = 4.0*electron_mass_c2;
53 highEnergyLimit = 100 * GeV;
54 SetHighEnergyLimit(highEnergyLimit);
55
56 verboseLevel= 0;
57 // Verbosity scale:
58 // 0 = nothing
59 // 1 = warning for energy non-conservation
60 // 2 = details of energy budget
61 // 3 = calculation of cross sections, file openings, sampling of atoms
62 // 4 = entering in methods
63
64 if(verboseLevel > 0) {
65 G4cout << "Triplet Gamma conversion is constructed " << G4endl
66 << "Energy range: "
67 << lowEnergyLimit / MeV << " MeV - "
68 << highEnergyLimit / GeV << " GeV"
69 << G4endl;
70 }
71}
G4endl
#define G4endl
Definition: G4ios.hh:52
G4cout
G4DLLIMPORT std::ostream G4cout
G4BoldyshevTripletModel::fParticleChange
G4ParticleChangeForGamma * fParticleChange
Definition: G4BoldyshevTripletModel.hh:70
G4VEmModel::SetHighEnergyLimit
void SetHighEnergyLimit(G4double)
Definition: G4VEmModel.hh:585

◆ ~G4BoldyshevTripletModel()

G4BoldyshevTripletModel::~G4BoldyshevTripletModel ( )
virtual

Definition at line 75 of file G4BoldyshevTripletModel.cc.

76{
77 if (crossSectionHandler) delete crossSectionHandler;
78}

Member Function Documentation

◆ ComputeCrossSectionPerAtom()

G4double G4BoldyshevTripletModel::ComputeCrossSectionPerAtom ( const G4ParticleDefinition *  ,
G4double  kinEnergy,
G4double  Z,
G4double  A = 0,
G4double  cut = 0,
G4double  emax = DBL_MAX 
)
virtual

Reimplemented from G4VEmModel.

Definition at line 126 of file G4BoldyshevTripletModel.cc.

130{
131 if (verboseLevel > 3) {
132 G4cout << "Calling ComputeCrossSectionPerAtom() of G4BoldyshevTripletModel"
133 << G4endl;
134 }
135 if (GammaEnergy < lowEnergyLimit || GammaEnergy > highEnergyLimit) return 0;
136
137 G4double cs = crossSectionHandler->FindValue(G4int(Z), GammaEnergy);
138 return cs;
139}
G4double
double G4double
Definition: G4Types.hh:64
G4int
int G4int
Definition: G4Types.hh:66
G4VCrossSectionHandler::FindValue
G4double FindValue(G4int Z, G4double e) const
Definition: G4VCrossSectionHandler.cc:379

◆ GetMeanFreePath()

G4double G4BoldyshevTripletModel::GetMeanFreePath ( const G4Track &  aTrack,
G4double  previousStepSize,
G4ForceCondition *  condition 
)
protected

◆ Initialise()

void G4BoldyshevTripletModel::Initialise ( const G4ParticleDefinition *  ,
const G4DataVector &   
)
virtual

Implements G4VEmModel.

Definition at line 83 of file G4BoldyshevTripletModel.cc.

85{
86 if (verboseLevel > 3)
87 G4cout << "Calling G4BoldyshevTripletModel::Initialise()" << G4endl;
88
89 if (crossSectionHandler)
90 {
91 crossSectionHandler->Clear();
92 delete crossSectionHandler;
93 }
94
95 // Read data tables for all materials
96
97 crossSectionHandler = new G4CrossSectionHandler();
98 crossSectionHandler->Initialise(0,lowEnergyLimit,100.*GeV,400);
99 G4String crossSectionFile = "tripdata/pp-trip-cs-"; // here only pair in electron field cs should be used
100 crossSectionHandler->LoadData(crossSectionFile);
101
102 //
103
104 if (verboseLevel > 0) {
105 G4cout << "Loaded cross section files for Livermore GammaConversion" << G4endl;
106 G4cout << "To obtain the total cross section this should be used only " << G4endl
107 << "in connection with G4NuclearGammaConversion " << G4endl;
108 }
109
110 if (verboseLevel > 0) {
111 G4cout << "Livermore Electron Gamma Conversion model is initialized " << G4endl
112 << "Energy range: "
113 << LowEnergyLimit() / MeV << " MeV - "
114 << HighEnergyLimit() / GeV << " GeV"
115 << G4endl;
116 }
117
118 if(isInitialised) return;
119 fParticleChange = GetParticleChangeForGamma();
120 isInitialised = true;
121}
G4VCrossSectionHandler::LoadData
void LoadData(const G4String &dataFile)
Definition: G4VCrossSectionHandler.cc:187
G4VCrossSectionHandler::Initialise
void Initialise(G4VDataSetAlgorithm *interpolation=0, G4double minE=250 *CLHEP::eV, G4double maxE=100 *CLHEP::GeV, G4int numberOfBins=200, G4double unitE=CLHEP::MeV, G4double unitData=CLHEP::barn, G4int minZ=1, G4int maxZ=99)
Definition: G4VCrossSectionHandler.cc:140
G4VEmModel::GetParticleChangeForGamma
G4ParticleChangeForGamma * GetParticleChangeForGamma()
Definition: G4VEmModel.cc:109
G4VEmModel::LowEnergyLimit
G4double LowEnergyLimit() const
Definition: G4VEmModel.hh:529
G4VEmModel::HighEnergyLimit
G4double HighEnergyLimit() const
Definition: G4VEmModel.hh:522

◆ SampleSecondaries()

void G4BoldyshevTripletModel::SampleSecondaries ( std::vector< G4DynamicParticle * > *  fvect,
const G4MaterialCutsCouple *  ,
const G4DynamicParticle *  aDynamicGamma,
G4double  tmin,
G4double  maxEnergy 
)
virtual

Implements G4VEmModel.

Definition at line 143 of file G4BoldyshevTripletModel.cc.

148{
149
150// The energies of the secondary particles are sampled using
151// a modified Wheeler-Lamb model (see PhysRevD 7 (1973), 26)
152
153 if (verboseLevel > 3)
154 G4cout << "Calling SampleSecondaries() of G4BoldyshevTripletModel" << G4endl;
155
156 G4double photonEnergy = aDynamicGamma->GetKineticEnergy();
157 G4ParticleMomentum photonDirection = aDynamicGamma->GetMomentumDirection();
158
159 G4double epsilon ;
160 G4double p0 = electron_mass_c2;
161
162 G4double positronTotEnergy, electronTotEnergy, thetaEle, thetaPos;
163 G4double ener_re=0., theta_re, phi_re, phi;
164
165 // Calculo de theta - elecron de recoil
166
167 G4double energyThreshold = sqrt(2.)*electron_mass_c2; // -> momentumThreshold_N = 1
168 energyThreshold = 1.1*electron_mass_c2;
169 // G4cout << energyThreshold << G4endl;
170
171 G4double momentumThreshold_c = sqrt(energyThreshold * energyThreshold - electron_mass_c2*electron_mass_c2); // momentun in MeV/c unit
172 G4double momentumThreshold_N = momentumThreshold_c/electron_mass_c2; // momentun in mc unit
173
174 // Calculation of recoil electron production
175
176 G4double SigmaTot = (28./9.) * std::log ( 2.* photonEnergy / electron_mass_c2 ) - 218. / 27. ;
177 G4double X_0 = 2. * ( sqrt(momentumThreshold_N*momentumThreshold_N + 1) -1 );
178 G4double SigmaQ = (82./27. - (14./9.) * log (X_0) + 4./15.*X_0 - 0.0348 * X_0 * X_0);
179 G4double recoilProb = G4UniformRand();
180 //G4cout << "SIGMA TOT " << SigmaTot << " " << "SigmaQ " << SigmaQ << " " << SigmaQ/SigmaTot << " " << recoilProb << G4endl;
181
182 if (recoilProb >= SigmaQ/SigmaTot) // create electron recoil
183 {
184
185 G4double cosThetaMax = ( ( energyThreshold - electron_mass_c2 ) / (momentumThreshold_c) + electron_mass_c2*
186 ( energyThreshold + electron_mass_c2 ) / (photonEnergy*momentumThreshold_c) );
187
188 if (cosThetaMax > 1) G4cout << "ERRORE " << G4endl;
189
190 G4double r1;
191 G4double r2;
192 G4double are, bre, loga, f1_re, greject, cost;
193
194 do {
195 r1 = G4UniformRand();
196 r2 = G4UniformRand();
197 // cost = (pow(4./enern,0.5*r1)) ;
198 cost = pow(cosThetaMax,r1);
199 theta_re = acos(cost);
200 are = 1./(14.*cost*cost);
201 bre = (1.-5.*cost*cost)/(2.*cost);
202 loga = log((1.+ cost)/(1.- cost));
203 f1_re = 1. - bre*loga;
204
205 if ( theta_re >= 4.47*CLHEP::pi/180.)
206 {
207 greject = are*f1_re;
208 } else {
209 greject = 1. ;
210 }
211 } while(greject < r2);
212
213 // Calculo de phi - elecron de recoil
214
215 G4double r3, r4, rt;
216
217 do {
218
219 r3 = G4UniformRand();
220 r4 = G4UniformRand();
221 phi_re = twopi*r3 ;
222 G4double sint2 = 1. - cost*cost ;
223 G4double fp = 1. - sint2*loga/(2.*cost) ;
224 rt = (1.-cos(2.*phi_re)*fp/f1_re)/(2.*pi) ;
225
226 } while(rt < r4);
227
228 // Calculo de la energia - elecron de recoil - relacion momento maximo <-> angulo
229
230 G4double S = electron_mass_c2*(2.* photonEnergy + electron_mass_c2);
231 G4double D2 = 4.*S * electron_mass_c2*electron_mass_c2
232 + (S - electron_mass_c2*electron_mass_c2)
233 *(S - electron_mass_c2*electron_mass_c2)*sin(theta_re)*sin(theta_re);
234 ener_re = electron_mass_c2 * (S + electron_mass_c2*electron_mass_c2)/sqrt(D2);
235
236 // G4cout << "electron de retroceso " << ener_re << " " << theta_re << " " << phi_re << G4endl;
237
238 // Recoil electron creation
239 G4double dxEle_re=sin(theta_re)*std::cos(phi_re),dyEle_re=sin(theta_re)*std::sin(phi_re), dzEle_re=cos(theta_re);
240
241 G4double electronRKineEnergy = std::max(0.,ener_re - electron_mass_c2) ;
242
243 G4ThreeVector electronRDirection (dxEle_re, dyEle_re, dzEle_re);
244 electronRDirection.rotateUz(photonDirection);
245
246 G4DynamicParticle* particle3 = new G4DynamicParticle (G4Electron::Electron(),
247 electronRDirection,
248 electronRKineEnergy);
249 fvect->push_back(particle3);
250
251 }
252 else
253 {
254 // deposito la energia ener_re - electron_mass_c2
255 // G4cout << "electron de retroceso " << ener_re << G4endl;
256 fParticleChange->ProposeLocalEnergyDeposit(ener_re - electron_mass_c2);
257 }
258
259 // Depaola (2004) suggested distribution for e+e- energy
260
261 // G4double t = 0.5*asinh(momentumThreshold_N);
262 G4double t = 0.5*log(momentumThreshold_N + sqrt(momentumThreshold_N*momentumThreshold_N+1));
263
264 G4cout << 0.5*asinh(momentumThreshold_N) << " " << t << G4endl;
265
266 G4double J1 = 0.5*(t*cosh(t)/sinh(t) - log(2.*sinh(t)));
267 G4double J2 = (-2./3.)*log(2.*sinh(t)) + t*cosh(t)/sinh(t) + (sinh(t)-t*pow(cosh(t),3))/(3.*pow(sinh(t),3));
268 G4double b = 2.*(J1-J2)/J1;
269
270 G4double n = 1 - b/6.;
271 G4double re=0.;
272 re = G4UniformRand();
273 G4double a = 0.;
274 G4double b1 = 16. - 3.*b - 36.*b*re*n + 36.*b*pow(re,2.)*pow(n,2.) +
275 6.*pow(b,2.)*re*n;
276 a = pow((b1/b),0.5);
277 G4double c1 = (-6. + 12.*re*n + b + 2*a)*pow(b,2.);
278 epsilon = (pow(c1,1./3.))/(2.*b) + (b-4.)/(2.*pow(c1,1./3.))+0.5;
279
280 G4double photonEnergy1 = photonEnergy - ener_re ; // resto al foton la energia del electron de retro.
281 positronTotEnergy = epsilon*photonEnergy1;
282 electronTotEnergy = photonEnergy1 - positronTotEnergy; // temporarly
283
284 G4double momento_e = sqrt(electronTotEnergy*electronTotEnergy -
285 electron_mass_c2*electron_mass_c2) ;
286 G4double momento_p = sqrt(positronTotEnergy*positronTotEnergy -
287 electron_mass_c2*electron_mass_c2) ;
288
289 thetaEle = acos((sqrt(p0*p0/(momento_e*momento_e) +1.)- p0/momento_e)) ;
290 thetaPos = acos((sqrt(p0*p0/(momento_p*momento_p) +1.)- p0/momento_p)) ;
291 phi = twopi * G4UniformRand();
292
293 G4double dxEle= std::sin(thetaEle)*std::cos(phi),dyEle= std::sin(thetaEle)*std::sin(phi),dzEle=std::cos(thetaEle);
294 G4double dxPos=-std::sin(thetaPos)*std::cos(phi),dyPos=-std::sin(thetaPos)*std::sin(phi),dzPos=std::cos(thetaPos);
295
296
297 // Kinematics of the created pair:
298 // the electron and positron are assumed to have a symetric angular
299 // distribution with respect to the Z axis along the parent photon
300
301 G4double electronKineEnergy = std::max(0.,electronTotEnergy - electron_mass_c2) ;
302
303 // SI - The range test has been removed wrt original G4LowEnergyGammaconversion class
304
305 G4ThreeVector electronDirection (dxEle, dyEle, dzEle);
306 electronDirection.rotateUz(photonDirection);
307
308 G4DynamicParticle* particle1 = new G4DynamicParticle (G4Electron::Electron(),
309 electronDirection,
310 electronKineEnergy);
311
312 // The e+ is always created (even with kinetic energy = 0) for further annihilation
313 G4double positronKineEnergy = std::max(0.,positronTotEnergy - electron_mass_c2) ;
314
315 // SI - The range test has been removed wrt original G4LowEnergyGammaconversion class
316
317 G4ThreeVector positronDirection (dxPos, dyPos, dzPos);
318 positronDirection.rotateUz(photonDirection);
319
320 // Create G4DynamicParticle object for the particle2
321 G4DynamicParticle* particle2 = new G4DynamicParticle(G4Positron::Positron(),
322 positronDirection, positronKineEnergy);
323 // Fill output vector
324
325
326 fvect->push_back(particle1);
327 fvect->push_back(particle2);
328
329
330
331
332 // kill incident photon
333 fParticleChange->SetProposedKineticEnergy(0.);
334 fParticleChange->ProposeTrackStatus(fStopAndKill);
335
336}
fStopAndKill
@ fStopAndKill
Definition: G4TrackStatus.hh:56
G4UniformRand
#define G4UniformRand()
Definition: Randomize.hh:53
G4DynamicParticle::GetMomentumDirection
const G4ThreeVector & GetMomentumDirection() const
G4DynamicParticle::GetKineticEnergy
G4double GetKineticEnergy() const
G4Electron::Electron
static G4Electron * Electron()
Definition: G4Electron.cc:94
G4ParticleChangeForGamma::SetProposedKineticEnergy
void SetProposedKineticEnergy(G4double proposedKinEnergy)
Definition: G4ParticleChangeForGamma.hh:129
G4Positron::Positron
static G4Positron * Positron()
Definition: G4Positron.cc:94
G4VParticleChange::ProposeTrackStatus
void ProposeTrackStatus(G4TrackStatus status)
G4VParticleChange::ProposeLocalEnergyDeposit
void ProposeLocalEnergyDeposit(G4double anEnergyPart)

Member Data Documentation

◆ fParticleChange

G4ParticleChangeForGamma* G4BoldyshevTripletModel::fParticleChange
protected

Definition at line 70 of file G4BoldyshevTripletModel.hh.

Referenced by Initialise(), and SampleSecondaries().

The documentation for this class was generated from the following files: