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25 // 25 //
>> 26 // $Id$
>> 27 //
>> 28 // -------------------------------------------------------------------
26 // 29 //
27 // ------------------------------------------- <<
28 // 30 //
29 // GEANT4 Class header file 31 // GEANT4 Class header file
30 // 32 //
>> 33 //
31 // File name: G4GoudsmitSaundersonMscModel 34 // File name: G4GoudsmitSaundersonMscModel
32 // 35 //
33 // Author: Mihaly Novak / (Omrane Kadri << 36 // Author: Omrane Kadri
34 // 37 //
35 // Creation date: 20.02.2009 38 // Creation date: 20.02.2009
36 // 39 //
37 // Modifications: 40 // Modifications:
38 // 04.03.2009 V.Ivanchenko cleanup and format 41 // 04.03.2009 V.Ivanchenko cleanup and format according to Geant4 EM style
39 // 12.05.2010 O.Kadri: adding Qn1 and Qn12 as 42 // 12.05.2010 O.Kadri: adding Qn1 and Qn12 as private doubles
40 // 18.05.2015 M. Novak provide PLERIMINARYY ve <<
41 // All algorithms of the class were <<
42 // A new version of Kawrakow-Bielaj <<
43 // based on the screened Rutherford <<
44 // electrons/positrons has been int <<
45 // angular distributions over a 2D <<
46 // and the CDFs are now stored in a <<
47 // together with the corresponding <<
48 // These angular distributions are <<
49 // G4GoudsmitSaundersonTable class <<
50 // it was no, single, few or multip <<
51 // angular deflection (i.e. cos(the <<
52 // Two screening options are provid <<
53 // - if fgIsUsePWATotalXsecData=TR <<
54 // was called before initialisat <<
55 // determined such that the firs <<
56 // computed according to the scr <<
57 // scattering will reproduce the <<
58 // and first transport mean free <<
59 // - if fgIsUsePWATotalXsecData=FA <<
60 // SetOptionPWAScreening(FALSE) <<
61 // screening parameter value A i <<
62 // formula (by using material de <<
63 // precomputed for each material <<
64 // G4GoudsmitSaundersonTable) [3 <<
65 // Elastic and first trasport mean <<
66 // The new version is self-consiste <<
67 // robust and accurate compared to <<
68 // Spin effects as well as a more a <<
69 // computations of Lewis moments wi <<
70 // 02.09.2015 M. Novak: first version of new s <<
71 // fUseSafetyPlus corresponds to Ur <<
72 // fUseDistanceToBoundary correspon <<
73 // fUseSafety corresponds to EGSnr <<
74 // Range factor can be significantl <<
75 // 23.08.2017 M. Novak: added corrections to a <<
76 // It can be activated by setting t <<
77 // before initialization using the <<
78 // The fMottCorrection member is re <<
79 // correction (rejection) functions <<
80 // Goudsmit-Saunderson agnular dist <<
81 // effects and screening correction <<
82 // GS angular distributions is: DCS <<
83 // # DCS_{SR} is the relativisti <<
84 // solution of the Klein-Gordo <<
85 // scattering of spinless e- o <<
86 // note: the default (without <<
87 // are based on this DCS_{SR} <<
88 // # DCS_{R} is the Rutherford D <<
89 // screening <<
90 // # DCS_{Mott} is the Mott DCS <<
91 // Coulomb potential i.e. scat <<
92 // point-like unscreened Coulo <<
93 // # moreover, the screening par <<
94 // the DCS_{cor} with this cor <<
95 // transport cross sections ob <<
96 // (i.e. from elsepa [4]) <<
97 // Unlike the default GS, the Mott- <<
98 // (different for e- and e+ <= the <<
99 // (Z and material) dependent. <<
100 // 02.02.2018 M. Novak: implemented CrossSecti <<
101 // 43 //
102 // Class description: 44 // Class description:
103 // Kawrakow-Bielajew Goudsmit-Saunderson MSC <<
104 // for elastic scattering of e-/e+. Option, <<
105 // also available now (SetOptionMottCorrecti <<
106 // algorithm (UseSafety) is available beyond <<
107 // and true to geomerty and geometry to true <<
108 // from the Urban model[5]. The most accurat <<
109 // with Mott-correction (SetOptionMottCorrec <<
110 // <<
111 // References: <<
112 // [1] A.F.Bielajew, NIMB 111 (1996) 195-208 <<
113 // [2] I.Kawrakow, A.F.Bielajew, NIMB 134(19 <<
114 // [3] I.Kawrakow, E.Mainegra-Hing, D.W.O.Ro <<
115 // Report PIRS-701 (2013) <<
116 // [4] F.Salvat, A.Jablonski, C.J. Powell, C <<
117 // [5] L.Urban, Preprint CERN-OPEN-2006-077 <<
118 // 45 //
119 // ------------------------------------------- << 46 // Multiple scattering model using classical Goudsmit-Saunderson model
>> 47 //
>> 48 //@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
>> 49 //REFERENCES:
>> 50 //Ref.1:E. Benedito et al.,"Mixed simulation ... cross-sections", NIMB 174 (2001) pp 91-110;
>> 51 //Ref.2:I. Kawrakow et al.,"On the condensed ... transport",NIMB 142 (1998) pp 253-280;
>> 52 //Ref.3:I. Kawrakow et al.,"On the representation ... calculations",NIMB 134 (1998) pp 325-336;
>> 53 //Ref.4:I. Kawrakow et al.,"The EGSnrc code ... Transport",NRCC Report PIRS-701, Sept. 21, 2006;
>> 54 //Ref.5:F. Salvat et al.,"ELSEPA--Dirac partial ...molecules", Comp. Phys. Comm. 165 (2005) pp 157-190;
>> 55 //Ref.6:G4UrbanMscModel G4_v9.1Ref09;
>> 56 //Ref.7:G4WentzelVIModel G4_v9.3.
>> 57 //@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
120 58
121 #ifndef G4GoudsmitSaundersonMscModel_h 59 #ifndef G4GoudsmitSaundersonMscModel_h
122 #define G4GoudsmitSaundersonMscModel_h 1 60 #define G4GoudsmitSaundersonMscModel_h 1
123 61
124 #include <CLHEP/Units/SystemOfUnits.h> 62 #include <CLHEP/Units/SystemOfUnits.h>
125 63
126 #include "G4VMscModel.hh" 64 #include "G4VMscModel.hh"
127 #include "G4PhysicsTable.hh" 65 #include "G4PhysicsTable.hh"
128 #include "G4MaterialCutsCouple.hh" <<
129 #include "globals.hh" 66 #include "globals.hh"
130 67
131 <<
132 class G4DataVector; 68 class G4DataVector;
133 class G4ParticleChangeForMSC; 69 class G4ParticleChangeForMSC;
134 class G4LossTableManager; 70 class G4LossTableManager;
135 class G4GoudsmitSaundersonTable; 71 class G4GoudsmitSaundersonTable;
136 class G4GSPWACorrections; <<
137 72
138 class G4GoudsmitSaundersonMscModel : public G4 73 class G4GoudsmitSaundersonMscModel : public G4VMscModel
139 { 74 {
140 public: 75 public:
141 76
142 G4GoudsmitSaundersonMscModel(const G4String& 77 G4GoudsmitSaundersonMscModel(const G4String& nam = "GoudsmitSaunderson");
143 78
144 ~G4GoudsmitSaundersonMscModel() override; << 79 virtual ~G4GoudsmitSaundersonMscModel();
145 <<
146 void Initialise(const G4ParticleDefinition*, <<
147 <<
148 void InitialiseLocal(const G4ParticleDefinit <<
149 <<
150 G4ThreeVector& SampleScattering(const G4Thre <<
151 80
152 G4double ComputeTruePathLengthLimit(const G4 << 81 virtual void Initialise(const G4ParticleDefinition*, const G4DataVector&);
153 82
154 G4double ComputeGeomPathLength(G4double true << 83 void StartTracking(G4Track*);
155 84
156 G4double ComputeTrueStepLength(G4double geom << 85 virtual G4double ComputeCrossSectionPerAtom(const G4ParticleDefinition* particle,
>> 86 G4double KineticEnergy,
>> 87 G4double AtomicNumber, G4double,
>> 88 G4double, G4double);
157 89
158 // method to compute first transport cross s << 90 virtual G4ThreeVector& SampleScattering(const G4DynamicParticle*,
159 // method is used only for testing and not d << 91 G4double safety);
160 G4double CrossSectionPerVolume(const G4Mater <<
161 92
162 void StartTracking(G4Track*) override; << 93 virtual G4double ComputeTruePathLengthLimit(const G4Track& track,
>> 94 G4double& currentMinimalStep);
163 95
164 void SampleMSC(); << 96 virtual G4double ComputeGeomPathLength(G4double truePathLength);
165 97
166 G4double GetTransportMeanFreePath(const G4Pa << 98 virtual G4double ComputeTrueStepLength(G4double geomStepLength);
167 99
168 void SetOptionPWACorrection(G4bool opt) { << 100 private:
>> 101 void SampleCosineTheta(G4double,G4double,G4double &,G4double &);
169 102
170 G4bool GetOptionPWACorrection() const { << 103 void CalculateIntegrals(const G4ParticleDefinition* ,G4double,G4double,
>> 104 G4double&,G4double&);
171 105
172 void SetOptionMottCorrection(G4bool opt) { << 106 void LoadELSEPAXSections();
173 107
174 G4bool GetOptionMottCorrection() const { << 108 inline void SetParticle(const G4ParticleDefinition* p);
175 <<
176 G4GoudsmitSaundersonTable* GetGSTable() <<
177 <<
178 G4GSPWACorrections* GetPWACorrection( <<
179 <<
180 // hide assignment operator <<
181 G4GoudsmitSaundersonMscModel & operator=(con <<
182 G4GoudsmitSaundersonMscModel(const G4Goudsm <<
183 <<
184 private: <<
185 inline void SetParticle(const G4Particle <<
186 109
187 inline G4double GetLambda(G4double); 110 inline G4double GetLambda(G4double);
188 111
189 G4double GetTransportMeanFreePathOnly(const << 112 // hide assignment operator
190 << 113 G4GoudsmitSaundersonMscModel & operator=(const G4GoudsmitSaundersonMscModel &right);
191 inline G4double Randomizetlimit(); << 114 G4GoudsmitSaundersonMscModel(const G4GoudsmitSaundersonMscModel&);
192 115
193 private: << 116 G4double lowKEnergy;
194 CLHEP::HepRandomEngine* rndmEngineMod; << 117 G4double highKEnergy;
195 // <<
196 G4double currentKinEnergy; 118 G4double currentKinEnergy;
197 G4double currentRange; << 119 G4double currentRange;
198 // << 120
199 G4double fr; << 121 G4double smallstep,tlimitminfix,skindepth;
200 G4double rangeinit; << 122 G4double fr,rangeinit,masslimite,tgeom;
201 G4double geombig; << 123 G4double par1,par2,par3,zPathLength,truePathLength;
202 G4double geomlimit; << 124 G4double tausmall,taulim,tlimit,tlimitmin,geommin,geombig;
203 G4double tlimit; << 125 G4double charge,lambdalimit;
204 G4double tgeom; << 126 G4double tPathLength,stepmin ;
205 // << 127 G4double lambda0,lambda1,lambda11;
206 G4double par1; <<
207 G4double par2; <<
208 G4double par3; <<
209 G4double tlimitminfix2; <<
210 G4double tausmall; <<
211 G4double mass; 128 G4double mass;
212 G4double taulim; <<
213 // <<
214 // <<
215 G4double presafety; <<
216 G4double fZeff; <<
217 // <<
218 G4int charge; <<
219 G4int currentMaterialIndex; 129 G4int currentMaterialIndex;
220 // << 130
221 G4bool firstStep; 131 G4bool firstStep;
222 // << 132 G4bool inside;
223 G4LossTableManager* theManager; << 133 G4bool insideskin;
>> 134
>> 135 G4GoudsmitSaundersonTable* GSTable;
>> 136 G4LossTableManager* theManager;
224 const G4ParticleDefinition* particle; 137 const G4ParticleDefinition* particle;
225 G4ParticleChangeForMSC* fParticleChange; 138 G4ParticleChangeForMSC* fParticleChange;
226 const G4MaterialCutsCouple* currentCouple; 139 const G4MaterialCutsCouple* currentCouple;
227 140
228 G4GoudsmitSaundersonTable* fGSTable; << 141 static G4double ener[106];
229 G4GSPWACorrections* fPWACorrection; << 142 static G4double TCSE[103][106];
>> 143 static G4double FTCSE[103][106];
>> 144 static G4double TCSP[103][106];
>> 145 static G4double FTCSP[103][106];
230 146
231 G4bool fIsUsePWACorrection; <<
232 G4bool fIsUseMottCorrection; <<
233 // <<
234 G4double fLambda0; // elastic mean free path <<
235 G4double fLambda1; // first transport mean f <<
236 G4double fScrA; // screening parameter <<
237 G4double fG1; // first transport coef. <<
238 // in case of Mott-correction <<
239 G4double fMCtoScrA; <<
240 G4double fMCtoQ1; <<
241 G4double fMCtoG2PerG1; <<
242 // <<
243 G4double fTheTrueStepLenght; <<
244 G4double fTheTransportDistance; <<
245 G4double fTheZPathLenght; <<
246 // <<
247 G4ThreeVector fTheDisplacementVector; <<
248 G4ThreeVector fTheNewDirection; <<
249 // <<
250 G4bool fIsEndedUpOnBoundary; // step ended <<
251 G4bool fIsMultipleSacettring; <<
252 G4bool fIsSingleScattering; <<
253 G4bool fIsEverythingWasDone; <<
254 G4bool fIsNoScatteringInMSC; <<
255 G4bool fIsNoDisplace; <<
256 G4bool fIsInsideSkin; <<
257 G4bool fIsWasOnBoundary; <<
258 G4bool fIsFirstRealStep; <<
259 // <<
260 static G4bool gIsUseAccurate; <<
261 static G4bool gIsOptimizationOn; <<
262 }; 147 };
>> 148 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
263 149
264 ////////////////////////////////////////////// <<
265 inline 150 inline
266 void G4GoudsmitSaundersonMscModel::SetParticle 151 void G4GoudsmitSaundersonMscModel::SetParticle(const G4ParticleDefinition* p)
267 { 152 {
268 if (p != particle) { 153 if (p != particle) {
269 particle = p; 154 particle = p;
270 charge = (G4int)(p->GetPDGCharge()/CLHEP:: <<
271 mass = p->GetPDGMass(); 155 mass = p->GetPDGMass();
>> 156 charge = p->GetPDGCharge()/CLHEP::eplus;
272 } 157 }
273 } 158 }
274 159
275 <<
276 //....oooOO0OOooo........oooOO0OOooo........oo 160 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
277 inline <<
278 G4double G4GoudsmitSaundersonMscModel::Randomi <<
279 { <<
280 G4double temptlimit; <<
281 do { <<
282 temptlimit = G4RandGauss::shoot(rndmE <<
283 } while ( (temptlimit<0.) || (temptlimi <<
284 <<
285 return temptlimit; <<
286 } <<
287 <<
288 <<
289 161
290 #endif 162 #endif
>> 163
291 164