[807] | 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 | // Rich advanced example for Geant4 |
---|
| 27 | // PadHpdPhotoElectricEffect.cc for Rich of LHCb |
---|
| 28 | // History: |
---|
| 29 | // Created: Sajan Easo (Sajan.Easo@cern.ch) |
---|
| 30 | // Revision: Patricia Mendez (Patricia.Mendez@cern.ch) |
---|
| 31 | ///////////////////////////////////////////////////////////////////////////// |
---|
| 32 | #include "globals.hh" |
---|
| 33 | #include <cmath> |
---|
| 34 | |
---|
| 35 | #include "PadHpdPhotoElectricEffect.hh" |
---|
| 36 | #include "RichTbGeometryParameters.hh" |
---|
| 37 | #include "G4TransportationManager.hh" |
---|
| 38 | #include "G4TouchableHandle.hh" |
---|
| 39 | #include "G4GeometryTolerance.hh" |
---|
| 40 | #include "Randomize.hh" |
---|
| 41 | #include "RichTbAnalysisManager.hh" |
---|
| 42 | #include "RichTbRunConfig.hh" |
---|
| 43 | #include "RichTbMaterialParameters.hh" |
---|
| 44 | |
---|
| 45 | #include "RichTbAnalysisManager.hh" |
---|
| 46 | |
---|
| 47 | PadHpdPhotoElectricEffect::PadHpdPhotoElectricEffect(const G4String& processName , |
---|
| 48 | RichTbRunConfig* RConfig) |
---|
| 49 | :G4VDiscreteProcess(processName), |
---|
| 50 | DemagnificationFactor(std::vector<G4double>(NumHpdTot)), |
---|
| 51 | DemagnificationQuadFactor(std::vector<G4double>(NumHpdTot)), |
---|
| 52 | HpdQE(NumHpdTot, std::vector<G4double>( NumQEbins)), |
---|
| 53 | HpdWabin(NumHpdTot, std::vector<G4double>( NumQEbins)) |
---|
| 54 | { |
---|
| 55 | rConfig=RConfig; |
---|
| 56 | PrePhotoElectricVolName="PadHpdWindowQuartz"; |
---|
| 57 | PostPhotoElectricVolName="BiAlkaliPhCathode"; |
---|
| 58 | HpdPhElectronKE=(RConfig-> getHpdPhElectronEnergy())*keV; |
---|
| 59 | PhCathodeToSilDetDist= HpdPhotoCathodeSiZdist; |
---|
| 60 | PSFsigma=PadHpdPSFsigma; |
---|
| 61 | |
---|
| 62 | for(G4int ihpdq=0; ihpdq<NumHpdTot; ihpdq++ ) { |
---|
| 63 | |
---|
| 64 | if( HpdDemagLinearTerm[ihpdq] != 0.0 ) { |
---|
| 65 | DemagnificationFactor[ihpdq]=1.0 / HpdDemagLinearTerm[ihpdq]; |
---|
| 66 | }else { DemagnificationFactor[ihpdq] =1.0 / 2.3;} |
---|
| 67 | |
---|
| 68 | if( HpdDemagQuadraticTerm[ihpdq] != 0.0 ) { |
---|
| 69 | |
---|
| 70 | DemagnificationQuadFactor[ihpdq]=1.0 / HpdDemagQuadraticTerm[ihpdq]; |
---|
| 71 | |
---|
| 72 | }else{DemagnificationQuadFactor[ihpdq]=0.0*(1.0/(1.0*mm)); } |
---|
| 73 | |
---|
| 74 | |
---|
| 75 | // Now to apply the error on the HPD demag factor. SE 28-4-02 |
---|
| 76 | // for now a flat error is applied. the uniform number from -1.0 to |
---|
| 77 | // 1.0 is obtained and then multiplied with the factor. |
---|
| 78 | |
---|
| 79 | G4double DemagError= (HpdDemagErrorPercent/100.0)*(2.0*G4UniformRand()-1.0) ; |
---|
| 80 | |
---|
| 81 | DemagnificationFactor[ihpdq] = DemagnificationFactor[ihpdq]*(1.0+DemagError); |
---|
| 82 | |
---|
| 83 | |
---|
| 84 | std::vector<G4double>qeCurHpd = InitializeHpdQE(ihpdq); |
---|
| 85 | std::vector<G4double>waCurHpd = InitializeHpdWaveL(ihpdq); |
---|
| 86 | if(qeCurHpd.size() != waCurHpd.size() ) { |
---|
| 87 | G4cout<<"Wrong size for Hpd QE "<<ihpdq<<" "<<qeCurHpd.size() |
---|
| 88 | <<" "<< waCurHpd.size()<<G4endl; |
---|
| 89 | } |
---|
| 90 | for(size_t iqbin=0; iqbin < qeCurHpd.size(); iqbin++){ |
---|
| 91 | HpdQE[ihpdq][iqbin]=qeCurHpd[iqbin]/100; |
---|
| 92 | HpdWabin[ihpdq][iqbin]=waCurHpd[iqbin]; |
---|
| 93 | } |
---|
| 94 | } |
---|
| 95 | G4cout<<GetProcessName() <<" is created "<<G4endl; |
---|
| 96 | |
---|
| 97 | |
---|
| 98 | } |
---|
| 99 | PadHpdPhotoElectricEffect::~PadHpdPhotoElectricEffect() {; } |
---|
| 100 | |
---|
| 101 | G4bool PadHpdPhotoElectricEffect::IsApplicable(const G4ParticleDefinition& |
---|
| 102 | aParticleType) |
---|
| 103 | { |
---|
| 104 | return ( &aParticleType == G4OpticalPhoton::OpticalPhoton() ); |
---|
| 105 | } |
---|
| 106 | |
---|
| 107 | G4double PadHpdPhotoElectricEffect::GetMeanFreePath(const G4Track& , |
---|
| 108 | G4double , |
---|
| 109 | G4ForceCondition* condition) |
---|
| 110 | { |
---|
| 111 | *condition = Forced; |
---|
| 112 | |
---|
| 113 | return DBL_MAX; |
---|
| 114 | } |
---|
| 115 | |
---|
| 116 | G4VParticleChange* PadHpdPhotoElectricEffect::PostStepDoIt(const G4Track& aTrack, |
---|
| 117 | const G4Step& aStep) |
---|
| 118 | { |
---|
| 119 | |
---|
| 120 | aParticleChange.Initialize(aTrack); |
---|
| 121 | |
---|
| 122 | G4StepPoint* pPreStepPoint = aStep.GetPreStepPoint(); |
---|
| 123 | G4StepPoint* pPostStepPoint = aStep.GetPostStepPoint(); |
---|
| 124 | |
---|
| 125 | |
---|
| 126 | |
---|
| 127 | if (pPostStepPoint->GetStepStatus() != fGeomBoundary){ |
---|
| 128 | |
---|
| 129 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
---|
| 130 | |
---|
| 131 | } |
---|
| 132 | |
---|
| 133 | |
---|
| 134 | G4String PrePhName = pPreStepPoint -> GetPhysicalVolume() -> |
---|
| 135 | GetLogicalVolume() -> GetMaterial()->GetName(); |
---|
| 136 | G4String PostPhName= pPostStepPoint -> GetPhysicalVolume() -> |
---|
| 137 | GetLogicalVolume() -> GetMaterial() ->GetName(); |
---|
| 138 | |
---|
| 139 | |
---|
| 140 | if(( PrePhName == PrePhotoElectricVolName && |
---|
| 141 | PostPhName == PostPhotoElectricVolName) || |
---|
| 142 | ( PostPhName == PrePhotoElectricVolName && |
---|
| 143 | PrePhName == PostPhotoElectricVolName) ) { |
---|
| 144 | |
---|
| 145 | |
---|
| 146 | }else { |
---|
| 147 | |
---|
| 148 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
---|
| 149 | |
---|
| 150 | } |
---|
| 151 | |
---|
| 152 | G4double kCarTolerance = G4GeometryTolerance::GetInstance()->GetSurfaceTolerance(); |
---|
| 153 | if (aTrack.GetStepLength()<=kCarTolerance/2){ |
---|
| 154 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
---|
| 155 | } |
---|
| 156 | |
---|
| 157 | const G4DynamicParticle* aDynamicPhoton = aTrack.GetDynamicParticle(); |
---|
| 158 | G4double PhotonEnergy = aDynamicPhoton->GetKineticEnergy(); |
---|
| 159 | |
---|
| 160 | if(PhotonEnergy <= 0.0 ) { |
---|
| 161 | |
---|
| 162 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
---|
| 163 | } |
---|
| 164 | |
---|
| 165 | |
---|
| 166 | //Now use the QE for the current HPD to determine if a |
---|
| 167 | // photoelectron should be produced or not. |
---|
| 168 | |
---|
| 169 | G4int currentHpdNumber= pPreStepPoint->GetTouchableHandle() |
---|
| 170 | -> GetReplicaNumber(1); |
---|
| 171 | if(currentHpdNumber >= NumHpdTot ){ |
---|
| 172 | |
---|
| 173 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
---|
| 174 | |
---|
| 175 | } |
---|
| 176 | |
---|
| 177 | G4double PhotWLength=PhotMomWaveConv/(PhotonEnergy/eV); |
---|
| 178 | |
---|
| 179 | G4double PhCathodeQE = getHpdQEff(currentHpdNumber, PhotWLength); |
---|
| 180 | G4double randomnum = G4UniformRand(); |
---|
| 181 | |
---|
| 182 | |
---|
| 183 | //the following three lines are copied from few lines later just |
---|
| 184 | // for histogramming convenience. |
---|
| 185 | G4ThreeVector GlobalElectronOrigin= pPostStepPoint->GetPosition(); |
---|
| 186 | |
---|
| 187 | G4Navigator* theNavigator = |
---|
| 188 | G4TransportationManager::GetTransportationManager()-> |
---|
| 189 | GetNavigatorForTracking(); |
---|
| 190 | G4ThreeVector LocalElectronOrigin = theNavigator-> |
---|
| 191 | GetGlobalToLocalTransform(). |
---|
| 192 | TransformPoint(GlobalElectronOrigin); |
---|
| 193 | |
---|
| 194 | |
---|
| 195 | |
---|
| 196 | // For the histogram of the radius of the cherenkov circle. |
---|
| 197 | // This assumes that the beam is along 001 axis in the global |
---|
| 198 | // coord system. |
---|
| 199 | G4double GLx=GlobalElectronOrigin.x(); |
---|
| 200 | G4double GLy=GlobalElectronOrigin.y(); |
---|
| 201 | // G4double PhotCkvRad = std::pow((std::pow(GLx,2)+std::pow(GLy,2)),0.5); |
---|
| 202 | G4double PhotCkvPhi = std::atan2(GLy,GLx)*180.0/pi; |
---|
| 203 | |
---|
| 204 | if( PhotCkvPhi < - 180.0 )PhotCkvPhi+= 360.0; |
---|
| 205 | |
---|
| 206 | if(randomnum < PhCathodeQE ) { |
---|
| 207 | |
---|
| 208 | |
---|
| 209 | G4double CurDemagFactor=DemagnificationFactor[currentHpdNumber]; |
---|
| 210 | G4double CurDemagQuadFactor=DemagnificationQuadFactor[currentHpdNumber]; |
---|
| 211 | |
---|
| 212 | // now get the Point Spread function. |
---|
| 213 | |
---|
| 214 | G4double PsfRandomAzimuth = twopi*G4UniformRand(); |
---|
| 215 | G4double PsfRandomRad= G4RandGauss::shoot(0.0,PSFsigma); |
---|
| 216 | G4double PsfX= PsfRandomRad*std::cos( PsfRandomAzimuth); |
---|
| 217 | G4double PsfY= PsfRandomRad*std::sin( PsfRandomAzimuth); |
---|
| 218 | |
---|
| 219 | |
---|
| 220 | G4ThreeVector LocalElectronDirection( |
---|
| 221 | (CurDemagFactor+CurDemagQuadFactor*LocalElectronOrigin.x()-1.0)*LocalElectronOrigin.x()+PsfX, |
---|
| 222 | (CurDemagFactor+CurDemagQuadFactor*LocalElectronOrigin.y()-1.0)*LocalElectronOrigin.y()+PsfY, |
---|
| 223 | -(PhCathodeToSilDetDist- |
---|
| 224 | (HpdPhCathodeRInner-LocalElectronOrigin.z()))); |
---|
| 225 | //normalize this vector and then transform back to global coord system. |
---|
| 226 | LocalElectronDirection = LocalElectronDirection.unit(); |
---|
| 227 | |
---|
| 228 | const G4ThreeVector GlobalElectronDirection = theNavigator-> |
---|
| 229 | GetLocalToGlobalTransform(). |
---|
| 230 | TransformAxis(LocalElectronDirection); |
---|
| 231 | |
---|
| 232 | G4double ElecKineEnergy=getHpdPhElectronKE(); |
---|
| 233 | |
---|
| 234 | //create the electron |
---|
| 235 | G4DynamicParticle* aElectron= new G4DynamicParticle (G4Electron::Electron(), |
---|
| 236 | GlobalElectronDirection, ElecKineEnergy) ; |
---|
| 237 | |
---|
| 238 | aParticleChange.SetNumberOfSecondaries(1) ; |
---|
| 239 | // aParticleChange.AddSecondary( aElectron ) ; |
---|
| 240 | aParticleChange.AddSecondary( aElectron,GlobalElectronOrigin,true ) ; |
---|
| 241 | |
---|
| 242 | |
---|
| 243 | // Kill the incident photon when it has converted to photoelectron. |
---|
| 244 | |
---|
| 245 | aParticleChange.ProposeLocalEnergyDeposit(PhotonEnergy); |
---|
| 246 | aParticleChange.ProposeEnergy(0.); |
---|
| 247 | aParticleChange.ProposeTrackStatus(fStopAndKill); |
---|
| 248 | } |
---|
| 249 | //photon is not killed if it is not converted to photoelectron |
---|
| 250 | //SE 26-09-01. |
---|
| 251 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
---|
| 252 | |
---|
| 253 | } |
---|
| 254 | |
---|
| 255 | G4double PadHpdPhotoElectricEffect::getHpdQEff(G4int HpdNum, |
---|
| 256 | G4double PhotonWLength){ |
---|
| 257 | |
---|
| 258 | G4double hq1,hq2, wa1, wa2,aslope,aintc; |
---|
| 259 | G4double qeff=0.0; |
---|
| 260 | for (G4int ibinq=0 ; ibinq<NumQEbins-1 ; ibinq++ ){ |
---|
| 261 | wa1 = HpdWabin[HpdNum][ibinq]; |
---|
| 262 | wa2 = HpdWabin[HpdNum][ibinq+1]; |
---|
| 263 | if( PhotonWLength >= wa1 && PhotonWLength <= wa2 ) { |
---|
| 264 | hq1 = HpdQE[HpdNum][ibinq]; |
---|
| 265 | hq2 = HpdQE[HpdNum][ibinq+1]; |
---|
| 266 | aslope = (hq2-hq1)/(wa2-wa1); |
---|
| 267 | aintc = hq1 - (aslope * wa1 ); |
---|
| 268 | qeff= aintc + aslope * PhotonWLength ; |
---|
| 269 | return qeff; |
---|
| 270 | } |
---|
| 271 | |
---|
| 272 | } |
---|
| 273 | return qeff; |
---|
| 274 | } |
---|
| 275 | |
---|
| 276 | |
---|
| 277 | |
---|
| 278 | |
---|