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25 // 25 //
>> 26 //
>> 27 // $Id: G4SynchrotronRadiation.cc,v 1.8 2010/10/14 18:38:21 vnivanch Exp $
>> 28 // GEANT4 tag $Name: geant4-09-04 $
>> 29 //
26 // ------------------------------------------- 30 // --------------------------------------------------------------
27 // GEANT 4 class implementation file 31 // GEANT 4 class implementation file
>> 32 // CERN Geneva Switzerland
28 // 33 //
29 // History: first implementation, << 34 // History: first implementation,
30 // 21-5-98 V.Grichine 35 // 21-5-98 V.Grichine
31 // 28-05-01, V.Ivanchenko minor changes t << 36 // 28-05-01, V.Ivanchenko minor changes to provide ANSI -wall compilation
32 // 04.03.05, V.Grichine: get local field << 37 // 04.03.05, V.Grichine: get local field interface
33 // 18-05-06 H. Burkhardt: Energy spectrum 38 // 18-05-06 H. Burkhardt: Energy spectrum from function rather than table
>> 39 //
>> 40 //
>> 41 //
34 // 42 //
35 ////////////////////////////////////////////// 43 ///////////////////////////////////////////////////////////////////////////
36 44
37 #include "G4SynchrotronRadiation.hh" 45 #include "G4SynchrotronRadiation.hh"
38 <<
39 #include "G4DipBustGenerator.hh" <<
40 #include "G4Electron.hh" <<
41 #include "G4EmProcessSubType.hh" <<
42 #include "G4Log.hh" <<
43 #include "G4LossTableManager.hh" <<
44 #include "G4Gamma.hh" <<
45 #include "G4PhysicalConstants.hh" <<
46 #include "G4PropagatorInField.hh" <<
47 #include "G4SystemOfUnits.hh" <<
48 #include "G4TransportationManager.hh" <<
49 #include "G4UnitsTable.hh" 46 #include "G4UnitsTable.hh"
50 #include "G4PhysicsModelCatalog.hh" << 47 #include "G4EmProcessSubType.hh"
51 48
52 ////////////////////////////////////////////// 49 ///////////////////////////////////////////////////////////////////////
>> 50 //
53 // Constructor 51 // Constructor
>> 52 //
>> 53
54 G4SynchrotronRadiation::G4SynchrotronRadiation 54 G4SynchrotronRadiation::G4SynchrotronRadiation(const G4String& processName,
55 << 55 G4ProcessType type):G4VDiscreteProcess (processName, type),
56 : G4VDiscreteProcess(processName, type) << 56 theGamma (G4Gamma::Gamma() ),
57 , theGamma(G4Gamma::Gamma()) << 57 theElectron ( G4Electron::Electron() ),
>> 58 thePositron ( G4Positron::Positron() )
58 { 59 {
59 G4TransportationManager* transportMgr = << 60 G4TransportationManager* transportMgr =
60 G4TransportationManager::GetTransportation 61 G4TransportationManager::GetTransportationManager();
61 62
62 fFieldPropagator = transportMgr->GetPropagat 63 fFieldPropagator = transportMgr->GetPropagatorInField();
63 64
64 secID = G4PhysicsModelCatalog::GetModelID("m << 65 fLambdaConst = std::sqrt(3.0)*electron_mass_c2/
>> 66 (2.5*fine_structure_const*eplus*c_light) ;
>> 67 fEnergyConst = 1.5*c_light*c_light*eplus*hbar_Planck/electron_mass_c2 ;
>> 68
65 SetProcessSubType(fSynchrotronRadiation); 69 SetProcessSubType(fSynchrotronRadiation);
66 verboseLevel = 1; << 70 verboseLevel=1;
67 FirstTime = true; <<
68 FirstTime1 = true; <<
69 genAngle = nullptr; <<
70 SetAngularGenerator(new G4DipBustGenerator() <<
71 theManager = G4LossTableManager::Instance(); <<
72 theManager->Register(this); <<
73 } 71 }
74 72
75 ////////////////////////////////////////////// 73 /////////////////////////////////////////////////////////////////////////
>> 74 //
76 // Destructor 75 // Destructor
>> 76 //
>> 77
77 G4SynchrotronRadiation::~G4SynchrotronRadiatio 78 G4SynchrotronRadiation::~G4SynchrotronRadiation()
78 { << 79 {}
79 delete genAngle; <<
80 theManager->DeRegister(this); <<
81 } <<
82 80
83 /////////////////////////////// METHODS ////// 81 /////////////////////////////// METHODS /////////////////////////////////
>> 82 //
>> 83 //
>> 84 // Production of synchrotron X-ray photon
>> 85 // GEANT4 internal units.
>> 86 //
84 87
85 void G4SynchrotronRadiation::SetAngularGenerat <<
86 { <<
87 if(p != genAngle) <<
88 { <<
89 delete genAngle; <<
90 genAngle = p; <<
91 } <<
92 } <<
93 <<
94 G4bool G4SynchrotronRadiation::IsApplicable( <<
95 const G4ParticleDefinition& particle) <<
96 { <<
97 return (particle.GetPDGCharge() != 0.0 && !p <<
98 } <<
99 88
100 ////////////////////////////////////////////// << 89 G4double
101 // Production of synchrotron X-ray photon << 90 G4SynchrotronRadiation::GetMeanFreePath( const G4Track& trackData,
102 // Geant4 internal units. << 91 G4double,
103 G4double G4SynchrotronRadiation::GetMeanFreePa << 92 G4ForceCondition* condition)
104 <<
105 <<
106 { 93 {
107 // gives the MeanFreePath in Geant4 internal << 94 // gives the MeanFreePath in GEANT4 internal units
108 G4double MeanFreePath = DBL_MAX; << 95 G4double MeanFreePath;
109 96
110 const G4DynamicParticle* aDynamicParticle = 97 const G4DynamicParticle* aDynamicParticle = trackData.GetDynamicParticle();
111 98
112 *condition = NotForced; << 99 *condition = NotForced ;
113 100
114 G4double gamma = << 101 G4double gamma = aDynamicParticle->GetTotalEnergy()/
115 aDynamicParticle->GetTotalEnergy() / aDyna << 102 aDynamicParticle->GetMass();
116 103
117 G4double particleCharge = aDynamicParticle-> 104 G4double particleCharge = aDynamicParticle->GetDefinition()->GetPDGCharge();
118 105
119 if(gamma < 1.0e3 || 0.0 == particleCharge) << 106 if ( gamma < 1.0e3 ) MeanFreePath = DBL_MAX;
120 { <<
121 MeanFreePath = DBL_MAX; <<
122 } <<
123 else 107 else
124 { 108 {
125 G4ThreeVector FieldValue; <<
126 const G4Field* pField = nullptr; <<
127 G4bool fieldExertsForce = false; <<
128 109
129 G4FieldManager* fieldMgr = << 110 G4ThreeVector FieldValue;
130 fFieldPropagator->FindAndSetFieldManager << 111 const G4Field* pField = 0;
131 112
132 if(fieldMgr != nullptr) << 113 G4FieldManager* fieldMgr=0;
>> 114 G4bool fieldExertsForce = false;
>> 115
>> 116 if( (particleCharge != 0.0) )
133 { 117 {
134 // If the field manager has no field, th << 118 fieldMgr = fFieldPropagator->FindAndSetFieldManager( trackData.GetVolume() );
135 fieldExertsForce = (fieldMgr->GetDetecto << 119
136 } << 120 if ( fieldMgr != 0 )
>> 121 {
>> 122 // If the field manager has no field, there is no field !
137 123
138 if(fieldExertsForce) << 124 fieldExertsForce = ( fieldMgr->GetDetectorField() != 0 );
>> 125 }
>> 126 }
>> 127 if ( fieldExertsForce )
139 { 128 {
140 pField = fieldMgr->G << 129 pField = fieldMgr->GetDetectorField() ;
141 G4ThreeVector globPosition = trackData.G << 130 G4ThreeVector globPosition = trackData.GetPosition();
142 131
143 G4double globPosVec[4], FieldValueVec[6] << 132 G4double globPosVec[3], FieldValueVec[3];
144 133
145 globPosVec[0] = globPosition.x(); 134 globPosVec[0] = globPosition.x();
146 globPosVec[1] = globPosition.y(); 135 globPosVec[1] = globPosition.y();
147 globPosVec[2] = globPosition.z(); 136 globPosVec[2] = globPosition.z();
148 globPosVec[3] = trackData.GetGlobalTime( <<
149 137
150 pField->GetFieldValue(globPosVec, FieldV << 138 pField->GetFieldValue( globPosVec, FieldValueVec );
>> 139
>> 140 FieldValue = G4ThreeVector( FieldValueVec[0],
>> 141 FieldValueVec[1],
>> 142 FieldValueVec[2] );
>> 143
151 144
152 FieldValue = <<
153 G4ThreeVector(FieldValueVec[0], FieldV <<
154 145
155 G4ThreeVector unitMomentum = aDynamicPar 146 G4ThreeVector unitMomentum = aDynamicParticle->GetMomentumDirection();
156 G4ThreeVector unitMcrossB = FieldValue. << 147 G4ThreeVector unitMcrossB = FieldValue.cross(unitMomentum) ;
157 G4double perpB = unitMcrossB << 148 G4double perpB = unitMcrossB.mag() ;
158 149
159 static const G4double fLambdaConst = << 150 if( perpB > 0.0 ) MeanFreePath = fLambdaConst/perpB;
160 std::sqrt(3.0) * eplus / (2.5 * fine_s << 151 else MeanFreePath = DBL_MAX;
161 152
162 if(perpB > 0.0) << 153 static G4bool FirstTime=true;
163 { <<
164 MeanFreePath = fLambdaConst * <<
165 aDynamicParticle->GetDe <<
166 (perpB * particleCharge <<
167 } <<
168 if(verboseLevel > 0 && FirstTime) 154 if(verboseLevel > 0 && FirstTime)
169 { 155 {
170 G4cout << "G4SynchrotronRadiation::Get << 156 G4cout << "G4SynchrotronRadiation::GetMeanFreePath :" << '\n' << std::setprecision(4)
171 << " for particle " << 157 << " MeanFreePath = " << G4BestUnit(MeanFreePath, "Length")
172 << aDynamicParticle->GetDefinit << 158 << G4endl;
173 << '\n' <<
174 << " MeanFreePath = " << G4Bes <<
175 << G4endl; <<
176 if(verboseLevel > 1) 159 if(verboseLevel > 1)
177 { 160 {
178 G4ThreeVector pvec = aDynamicParticl << 161 G4ThreeVector pvec=aDynamicParticle->GetMomentum();
179 G4double Btot = FieldValue.getR << 162 G4double Btot=FieldValue.getR();
180 G4double ptot = pvec.getR(); << 163 G4double ptot=pvec.getR();
181 G4double rho = ptot / (MeV * c << 164 G4double rho= ptot / (MeV * c_light * Btot ); // full bending radius
182 // full bending radius << 165 G4double Theta=unitMomentum.theta(FieldValue); // angle between particle and field
183 G4double Theta = unitMomentum.theta( << 166 G4cout
184 // angle between particle and field << 167 << " B = " << Btot/tesla << " Tesla"
185 G4cout << " B = " << Btot / tesla < << 168 << " perpB = " << perpB/tesla << " Tesla"
186 << " perpB = " << perpB / te << 169 << " Theta = " << Theta << " std::sin(Theta)=" << std::sin(Theta) << '\n'
187 << " Theta = " << Theta << 170 << " ptot = " << G4BestUnit(ptot,"Energy")
188 << " std::sin(Theta)=" << std << 171 << " rho = " << G4BestUnit(rho,"Length")
189 << " ptot = " << G4BestUnit << 172 << G4endl;
190 << " rho = " << G4BestUnit <<
191 } 173 }
192 FirstTime = false; << 174 FirstTime=false;
193 } 175 }
194 } 176 }
>> 177 else MeanFreePath = DBL_MAX;
>> 178
>> 179
195 } 180 }
>> 181
196 return MeanFreePath; 182 return MeanFreePath;
197 } 183 }
198 184
199 ////////////////////////////////////////////// << 185 ////////////////////////////////////////////////////////////////////////////////
200 G4VParticleChange* G4SynchrotronRadiation::Pos << 186 //
201 const G4Track& trackData, const G4Step& step << 187 //
>> 188
>> 189 G4VParticleChange*
>> 190 G4SynchrotronRadiation::PostStepDoIt(const G4Track& trackData,
>> 191 const G4Step& stepData )
202 192
203 { 193 {
204 aParticleChange.Initialize(trackData); 194 aParticleChange.Initialize(trackData);
205 195
206 const G4DynamicParticle* aDynamicParticle = << 196 const G4DynamicParticle* aDynamicParticle=trackData.GetDynamicParticle();
207 197
208 G4double gamma = aDynamicParticle->GetTotalE << 198 G4double gamma = aDynamicParticle->GetTotalEnergy()/
209 (aDynamicParticle->GetDefin << 199 (aDynamicParticle->GetMass() );
210 200
211 G4double particleCharge = aDynamicParticle-> << 201 if(gamma <= 1.0e3 )
212 if(gamma <= 1.0e3 || 0.0 == particleCharge) <<
213 { 202 {
214 return G4VDiscreteProcess::PostStepDoIt(tr << 203 return G4VDiscreteProcess::PostStepDoIt(trackData,stepData);
215 } 204 }
>> 205 G4double particleCharge = aDynamicParticle->GetDefinition()->GetPDGCharge();
216 206
217 G4ThreeVector FieldValue; << 207 G4ThreeVector FieldValue;
218 const G4Field* pField = nullptr; << 208 const G4Field* pField = 0 ;
219 209
220 G4bool fieldExertsForce = false; << 210 G4FieldManager* fieldMgr=0;
221 G4FieldManager* fieldMgr = << 211 G4bool fieldExertsForce = false;
222 fFieldPropagator->FindAndSetFieldManager(t <<
223 212
224 if(fieldMgr != nullptr) << 213 if( (particleCharge != 0.0) )
225 { 214 {
226 // If the field manager has no field, ther << 215 fieldMgr = fFieldPropagator->FindAndSetFieldManager( trackData.GetVolume() );
227 fieldExertsForce = (fieldMgr->GetDetectorF << 216 if ( fieldMgr != 0 )
228 } << 217 {
>> 218 // If the field manager has no field, there is no field !
229 219
230 if(fieldExertsForce) << 220 fieldExertsForce = ( fieldMgr->GetDetectorField() != 0 );
>> 221 }
>> 222 }
>> 223 if ( fieldExertsForce )
231 { 224 {
232 pField = fieldMgr->Get << 225 pField = fieldMgr->GetDetectorField() ;
233 G4ThreeVector globPosition = trackData.Get << 226 G4ThreeVector globPosition = trackData.GetPosition() ;
234 G4double globPosVec[4], FieldValueVec[6]; << 227 G4double globPosVec[3], FieldValueVec[3] ;
235 globPosVec[0] = globPosition.x(); << 228 globPosVec[0] = globPosition.x() ;
236 globPosVec[1] = globPosition.y(); << 229 globPosVec[1] = globPosition.y() ;
237 globPosVec[2] = globPosition.z(); << 230 globPosVec[2] = globPosition.z() ;
238 globPosVec[3] = trackData.GetGlobalTime(); << 231
239 << 232 pField->GetFieldValue( globPosVec, FieldValueVec ) ;
240 pField->GetFieldValue(globPosVec, FieldVal << 233 FieldValue = G4ThreeVector( FieldValueVec[0],
241 FieldValue = << 234 FieldValueVec[1],
242 G4ThreeVector(FieldValueVec[0], FieldVal << 235 FieldValueVec[2] );
243 236
244 G4ThreeVector unitMomentum = aDynamicParti 237 G4ThreeVector unitMomentum = aDynamicParticle->GetMomentumDirection();
245 G4ThreeVector unitMcrossB = FieldValue.cr << 238 G4ThreeVector unitMcrossB = FieldValue.cross(unitMomentum);
246 G4double perpB = unitMcrossB.m << 239 G4double perpB = unitMcrossB.mag() ;
247 if(perpB > 0.0) 240 if(perpB > 0.0)
248 { 241 {
249 // M-C of synchrotron photon energy 242 // M-C of synchrotron photon energy
250 G4double energyOfSR = GetRandomEnergySR( << 243
251 gamma, perpB, aDynamicParticle->GetDef << 244 G4double energyOfSR = GetRandomEnergySR(gamma,perpB);
252 245
253 // check against insufficient energy 246 // check against insufficient energy
254 if(energyOfSR <= 0.0) << 247
>> 248 if( energyOfSR <= 0.0 )
255 { 249 {
256 return G4VDiscreteProcess::PostStepDoI << 250 return G4VDiscreteProcess::PostStepDoIt(trackData,stepData);
257 } 251 }
258 G4double kineticEnergy = aDynamicParticl 252 G4double kineticEnergy = aDynamicParticle->GetKineticEnergy();
259 G4ThreeVector gammaDirection = << 253 G4ParticleMomentum
260 genAngle->SampleDirection(aDynamicPart << 254 particleDirection = aDynamicParticle->GetMomentumDirection();
>> 255
>> 256 // M-C of its direction
>> 257
>> 258 G4double Teta = G4UniformRand()/gamma ; // Very roughly
>> 259
>> 260 G4double Phi = twopi * G4UniformRand() ;
>> 261
>> 262 G4double dirx = std::sin(Teta)*std::cos(Phi) ,
>> 263 diry = std::sin(Teta)*std::sin(Phi) ,
>> 264 dirz = std::cos(Teta) ;
>> 265
>> 266 G4ThreeVector gammaDirection ( dirx, diry, dirz);
>> 267 gammaDirection.rotateUz(particleDirection);
>> 268
>> 269 // polarization of new gamma
>> 270
>> 271 // G4double sx = std::cos(Teta)*std::cos(Phi);
>> 272 // G4double sy = std::cos(Teta)*std::sin(Phi);
>> 273 // G4double sz = -std::sin(Teta);
261 274
262 G4ThreeVector gammaPolarization = FieldV 275 G4ThreeVector gammaPolarization = FieldValue.cross(gammaDirection);
263 gammaPolarization = gammaP << 276 gammaPolarization = gammaPolarization.unit();
>> 277
>> 278 // (sx, sy, sz);
>> 279 // gammaPolarization.rotateUz(particleDirection);
264 280
265 // create G4DynamicParticle object for t 281 // create G4DynamicParticle object for the SR photon
266 auto aGamma = << 282
267 new G4DynamicParticle(theGamma, gammaD << 283 G4DynamicParticle* aGamma= new G4DynamicParticle ( theGamma,
268 aGamma->SetPolarization(gammaPolarizatio << 284 gammaDirection,
269 gammaPolarizatio << 285 energyOfSR );
>> 286 aGamma->SetPolarization( gammaPolarization.x(),
>> 287 gammaPolarization.y(),
>> 288 gammaPolarization.z() );
>> 289
270 290
271 aParticleChange.SetNumberOfSecondaries(1 291 aParticleChange.SetNumberOfSecondaries(1);
>> 292 aParticleChange.AddSecondary(aGamma);
272 293
273 // Update the incident particle 294 // Update the incident particle
274 G4double newKinEnergy = kineticEnergy - <<
275 295
276 if(newKinEnergy > 0.) << 296 G4double newKinEnergy = kineticEnergy - energyOfSR ;
>> 297 aParticleChange.ProposeLocalEnergyDeposit (0.);
>> 298
>> 299 if (newKinEnergy > 0.)
277 { 300 {
278 aParticleChange.ProposeEnergy(newKinEn << 301 aParticleChange.ProposeMomentumDirection( particleDirection );
>> 302 aParticleChange.ProposeEnergy( newKinEnergy );
279 } 303 }
280 else 304 else
281 { 305 {
282 aParticleChange.ProposeEnergy(0.); << 306 aParticleChange.ProposeEnergy( 0. );
283 } 307 }
284 <<
285 // Create the G4Track <<
286 G4Track* aSecondaryTrack = new G4Track(a <<
287 aSecondaryTrack->SetTouchableHandle(step <<
288 aSecondaryTrack->SetParentID(trackData.G <<
289 aSecondaryTrack->SetCreatorModelID(secID <<
290 aParticleChange.AddSecondary(aSecondaryT <<
291 <<
292 } 308 }
293 } 309 }
294 return G4VDiscreteProcess::PostStepDoIt(trac << 310 return G4VDiscreteProcess::PostStepDoIt(trackData,stepData);
295 } 311 }
296 312
297 ////////////////////////////////////////////// << 313
>> 314 /////////////////////////////////////////////////////////////////////////////////
>> 315 //
>> 316 //
>> 317
298 G4double G4SynchrotronRadiation::InvSynFracInt 318 G4double G4SynchrotronRadiation::InvSynFracInt(G4double x)
299 // direct generation 319 // direct generation
300 { 320 {
301 // from 0 to 0.7 321 // from 0 to 0.7
302 static constexpr G4double aa1 = 0; << 322 const G4double aa1=0 ,aa2=0.7;
303 static constexpr G4double aa2 = 0. << 323 const G4int ncheb1=27;
304 static constexpr G4int ncheb1 = 27 << 324 static const G4double cheb1[] =
305 static constexpr G4double cheb1[ncheb1] = { << 325 { 1.22371665676046468821,0.108956475422163837267,0.0383328524358594396134,0.00759138369340257753721,
306 1.22371665676046468821, 0.108956475422 << 326 0.00205712048644963340914,0.000497810783280019308661,0.000130743691810302187818,0.0000338168760220395409734,
307 0.0383328524358594396134, 0.007591383693 << 327 8.97049680900520817728e-6,2.38685472794452241466e-6,6.41923109149104165049e-7,1.73549898982749277843e-7,
308 0.00205712048644963340914, 0.000497810783 << 328 4.72145949240790029153e-8,1.29039866111999149636e-8,3.5422080787089834182e-9,9.7594757336403784905e-10,
309 0.000130743691810302187818, 0.000033816876 << 329 2.6979510184976065731e-10,7.480422622550977077e-11,2.079598176402699913e-11,5.79533622220841193e-12,
310 8.97049680900520817728e-6, 2.386854727944 << 330 1.61856011449276096e-12,4.529450993473807e-13,1.2698603951096606e-13,3.566117394511206e-14,1.00301587494091e-14,
311 6.41923109149104165049e-7, 1.735498989827 << 331 2.82515346447219e-15,7.9680747949792e-16};
312 4.72145949240790029153e-8, 1.290398661119 <<
313 3.5422080787089834182e-9, 9.759475733640 <<
314 2.6979510184976065731e-10, 7.480422622550 <<
315 2.079598176402699913e-11, 5.795336222208 <<
316 1.61856011449276096e-12, 4.529450993473 <<
317 1.2698603951096606e-13, 3.566117394511 <<
318 1.00301587494091e-14, 2.825153464472 <<
319 7.9680747949792e-16 <<
320 }; <<
321 // from 0.7 to 0.9132260271183847 332 // from 0.7 to 0.9132260271183847
322 static constexpr G4double aa3 = 0. << 333 const G4double aa3=0.9132260271183847;
323 static constexpr G4int ncheb2 = 27 << 334 const G4int ncheb2=27;
324 static constexpr G4double cheb2[ncheb2] = { << 335 static const G4double cheb2[] =
325 1.1139496701107756, 0.3523967429328067 << 336 { 1.1139496701107756,0.3523967429328067,0.0713849171926623,0.01475818043595387,0.003381255637322462,
326 0.01475818043595387, 0.0033812556373224 << 337 0.0008228057599452224,0.00020785506681254216,0.00005390169253706556,0.000014250571923902464,3.823880733161044e-6,
327 0.00020785506681254216, 0.0000539016925370 << 338 1.0381966089136036e-6,2.8457557457837253e-7,7.86223332179956e-8,2.1866609342508474e-8,6.116186259857143e-9,
328 3.823880733161044e-6, 1.0381966089136036 << 339 1.7191233618437565e-9,4.852755117740807e-10,1.3749966961763457e-10,3.908961987062447e-11,1.1146253766895824e-11,
329 7.86223332179956e-8, 2.1866609342508474 << 340 3.1868887323415814e-12,9.134319791300977e-13,2.6211077371181566e-13,7.588643377757906e-14,2.1528376972619e-14,
330 1.7191233618437565e-9, 4.852755117740807e << 341 6.030906040404772e-15,1.9549163926819867e-15};
331 3.908961987062447e-11, 1.1146253766895824 << 342 // Chebyshev with exp/log scale
332 9.134319791300977e-13, 2.6211077371181566 << 343 // a = -Log[1 - SynFracInt[1]]; b = -Log[1 - SynFracInt[7]];
333 2.1528376972619e-14, 6.030906040404772e << 344 const G4double aa4=2.4444485538746025480,aa5=9.3830728608909477079;
334 }; << 345 const G4int ncheb3=28;
335 // Chebyshev with exp/log scale << 346 static const G4double cheb3[] =
336 // a = -Log[1 - SynFracInt[1]]; b = -Log[1 - << 347 { 1.2292683840435586977,0.160353449247864455879,-0.0353559911947559448721,0.00776901561223573936985,
337 static constexpr G4double aa4 = 2. << 348 -0.00165886451971685133259,0.000335719118906954279467,-0.0000617184951079161143187,9.23534039743246708256e-6,
338 static constexpr G4double aa5 = 9. << 349 -6.06747198795168022842e-7,-3.07934045961999778094e-7,1.98818772614682367781e-7,-8.13909971567720135413e-8,
339 static constexpr G4int ncheb3 = 28 << 350 2.84298174969641838618e-8,-9.12829766621316063548e-9,2.77713868004820551077e-9,-8.13032767247834023165e-10,
340 static constexpr G4double cheb3[ncheb3] = { << 351 2.31128525568385247392e-10,-6.41796873254200220876e-11,1.74815310473323361543e-11,-4.68653536933392363045e-12,
341 1.2292683840435586977, 0.1603534492 << 352 1.24016595805520752748e-12,-3.24839432979935522159e-13,8.44601465226513952994e-14,-2.18647276044246803998e-14,
342 -0.0353559911947559448721, 0.0077690156 << 353 5.65407548745690689978e-15,-1.46553625917463067508e-15,3.82059606377570462276e-16,-1.00457896653436912508e-16};
343 -0.00165886451971685133259, 0.0003357191 << 354 const G4double aa6=33.122936966163038145;
344 -0.0000617184951079161143187, 9.2353403974 << 355 const G4int ncheb4=27;
345 -6.06747198795168022842e-7, -3.079340459 << 356 static const G4double cheb4[] =
346 1.98818772614682367781e-7, -8.139099715 << 357 {1.69342658227676741765,0.0742766400841232319225,-0.019337880608635717358,0.00516065527473364110491,
347 2.84298174969641838618e-8, -9.128297666 << 358 -0.00139342012990307729473,0.000378549864052022522193,-0.000103167085583785340215,0.0000281543441271412178337,
348 2.77713868004820551077e-9, -8.130327672 << 359 -7.68409742018258198651e-6,2.09543221890204537392e-6,-5.70493140367526282946e-7,1.54961164548564906446e-7,
349 2.31128525568385247392e-10, -6.417968732 << 360 -4.19665599629607704794e-8,1.13239680054166507038e-8,-3.04223563379021441863e-9,8.13073745977562957997e-10,
350 1.74815310473323361543e-11, -4.686535369 << 361 -2.15969415476814981374e-10,5.69472105972525594811e-11,-1.48844799572430829499e-11,3.84901514438304484973e-12,
351 1.24016595805520752748e-12, -3.248394329 << 362 -9.82222575944247161834e-13,2.46468329208292208183e-13,-6.04953826265982691612e-14,1.44055805710671611984e-14,
352 8.44601465226513952994e-14, -2.186472760 << 363 -3.28200813577388740722e-15,6.96566359173765367675e-16,-1.294122794852896275e-16};
353 5.65407548745690689978e-15, -1.465536259 << 364
354 3.82059606377570462276e-16, -1.004578966 << 365 if(x<aa2) return x*x*x*Chebyshev(aa1,aa2,cheb1,ncheb1,x);
355 }; << 366 else if(x<aa3) return Chebyshev(aa2,aa3,cheb2,ncheb2,x);
356 static constexpr G4double aa6 = 33 << 367 else if(x<1-0.0000841363)
357 static constexpr G4int ncheb4 = 27 << 368 { G4double y=-std::log(1-x);
358 static constexpr G4double cheb4[ncheb4] = { << 369 return y*Chebyshev(aa4,aa5,cheb3,ncheb3,y);
359 1.69342658227676741765, 0.07427664008 <<
360 -0.019337880608635717358, 0.00516065527 <<
361 -0.00139342012990307729473, 0.00037854986 <<
362 -0.000103167085583785340215, 0.00002815434 <<
363 -7.68409742018258198651e-6, 2.09543221890 <<
364 -5.70493140367526282946e-7, 1.54961164548 <<
365 -4.19665599629607704794e-8, 1.13239680054 <<
366 -3.04223563379021441863e-9, 8.13073745977 <<
367 -2.15969415476814981374e-10, 5.69472105972 <<
368 -1.48844799572430829499e-11, 3.84901514438 <<
369 -9.82222575944247161834e-13, 2.46468329208 <<
370 -6.04953826265982691612e-14, 1.44055805710 <<
371 -3.28200813577388740722e-15, 6.96566359173 <<
372 -1.294122794852896275e-16 <<
373 }; <<
374 <<
375 if(x < aa2) <<
376 return x * x * x * Chebyshev(aa1, aa2, che <<
377 else if(x < aa3) <<
378 return Chebyshev(aa2, aa3, cheb2, ncheb2, <<
379 else if(x < 1 - 0.0000841363) <<
380 { <<
381 G4double y = -G4Log(1 - x); <<
382 return y * Chebyshev(aa4, aa5, cheb3, nche <<
383 } 370 }
384 else 371 else
385 { << 372 { G4double y=-std::log(1-x);
386 G4double y = -G4Log(1 - x); << 373 return y*Chebyshev(aa5,aa6,cheb4,ncheb4,y);
387 return y * Chebyshev(aa5, aa6, cheb4, nche <<
388 } 374 }
389 } 375 }
390 376
391 G4double G4SynchrotronRadiation::GetRandomEner << 377 G4double G4SynchrotronRadiation::GetRandomEnergySR(G4double gamma, G4double perpB)
392 <<
393 <<
394 { 378 {
395 static const G4double fEnergyConst = <<
396 1.5 * c_light * c_light * eplus * hbar_Pla <<
397 G4double Ecr = fEnergyConst * gamma * gamma <<
398 379
399 if(verboseLevel > 0 && FirstTime1) << 380 G4double Ecr=fEnergyConst*gamma*gamma*perpB;
400 { << 381
401 // mean and rms of photon energy << 382 static G4bool FirstTime=true;
402 G4double Emean = 8. / (15. * std::sqrt(3.) << 383 if(verboseLevel > 0 && FirstTime)
403 G4double E_rms = std::sqrt(211. / 675.) * << 384 { G4double Emean=8./(15.*std::sqrt(3.))*Ecr; // mean photon energy
404 G4long prec = G4cout.precision(); << 385 G4double E_rms=std::sqrt(211./675.)*Ecr; // rms of photon energy distribution
405 G4cout << "G4SynchrotronRadiation::GetRand << 386 G4cout << "G4SynchrotronRadiation::GetRandomEnergySR :" << '\n' << std::setprecision(4)
406 << std::setprecision(4) << " Ecr << 387 << " Ecr = " << G4BestUnit(Ecr,"Energy") << '\n'
407 << '\n' << 388 << " Emean = " << G4BestUnit(Emean,"Energy") << '\n'
408 << " Emean = " << G4BestUnit(Emean << 389 << " E_rms = " << G4BestUnit(E_rms,"Energy") << G4endl;
409 << " E_rms = " << G4BestUnit(E_rms << 390 FirstTime=false;
410 FirstTime1 = false; <<
411 G4cout.precision(prec); <<
412 } 391 }
413 392
414 G4double energySR = Ecr * InvSynFracInt(G4Un << 393 G4double energySR=Ecr*InvSynFracInt(G4UniformRand());
415 return energySR; 394 return energySR;
416 } 395 }
417 396
418 ////////////////////////////////////////////// << 397
419 void G4SynchrotronRadiation::BuildPhysicsTable 398 void G4SynchrotronRadiation::BuildPhysicsTable(const G4ParticleDefinition& part)
420 { 399 {
421 if(0 < verboseLevel && &part == G4Electron:: << 400 if(0 < verboseLevel && &part==theElectron ) PrintInfoDefinition();
422 ProcessDescription(G4cout); <<
423 // same for all particles, print only for on <<
424 } 401 }
425 402
426 ////////////////////////////////////////////// << 403 void G4SynchrotronRadiation::PrintInfoDefinition() // not yet called, usually called from BuildPhysicsTable
427 void G4SynchrotronRadiation::ProcessDescriptio <<
428 { 404 {
429 out << GetProcessName() << 405 G4String comments ="Incoherent Synchrotron Radiation\n";
430 << ": Incoherent Synchrotron Radiation\ << 406 G4cout << G4endl << GetProcessName() << ": " << comments
431 "Good description for long magnets at << 407 << " good description for long magnets at all energies" << G4endl;
432 } 408 }
>> 409
>> 410 ///////////////////// end of G4SynchrotronRadiation.cc
433 411