Gabriele Cosmo
1378 lines
46 KiB
C++
1378 lines
46 KiB
C++
// This code implementation is the intellectual property of
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// the GEANT4 collaboration.
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//
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// By copying, distributing or modifying the Program (or any work
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// based on the Program) you indicate your acceptance of this statement,
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// and all its terms.
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//
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// $Id: G4eEnergyLossPlus.cc,v 1.16.6.1 1999/12/07 20:51:01 gunter Exp $
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// GEANT4 tag $Name: geant4-01-00 $
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//
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// $Id:
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// -----------------------------------------------------------
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// GEANT 4 class implementation file
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//
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// For information related to this code contact:
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// CERN, IT Division, ASD group
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// History: based on object model of
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// 2nd December 1995, G.Cosmo
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// ---------- G4eEnergyLossPlus physics process -----------
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// by Laszlo Urban, 20 March 1997
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// **************************************************************
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// It is the first implementation of the NEW UNIFIED ENERGY LOSS PROCESS.
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// It calculates the energy loss of e+/e-.
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// --------------------------------------------------------------
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// 18/11/98 , L. Urban
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// It is a modified version of G4eEnergyLoss:
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// continuous energy loss with generation of subcutoff delta rays
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// 02/02/99 important correction in AlongStepDoIt , L.Urban
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// 28/04/99 bug fixed (unit independece now),L.Urban
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// --------------------------------------------------------------
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#include "G4eEnergyLossPlus.hh"
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#include "G4EnergyLossMessenger.hh"
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#include "G4Poisson.hh"
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#include "G4Navigator.hh"
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#include "G4TransportationManager.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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// Initialisation of static data members
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// -------------------------------------
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// Contributing processes : ion.loss + soft brems->NbOfProcesses is initialized
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// to 2 . YOU DO NOT HAVE TO CHANGE this variable for a 'normal' run.
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//
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// You have to change NbOfProcesses if you invent a new process contributing
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// to the continuous energy loss.
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// The NbOfProcesses data member can be changed using the (public static)
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// functions Get/Set/Plus/MinusNbOfProcesses (see G4eEnergyLossPlus.hh)
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G4int G4eEnergyLossPlus::NbOfProcesses = 2;
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G4int G4eEnergyLossPlus::CounterOfElectronProcess = 0;
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G4int G4eEnergyLossPlus::CounterOfPositronProcess = 0;
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G4PhysicsTable** G4eEnergyLossPlus::RecorderOfElectronProcess =
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new G4PhysicsTable*[10];
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G4PhysicsTable** G4eEnergyLossPlus::RecorderOfPositronProcess =
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new G4PhysicsTable*[10];
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G4bool G4eEnergyLossPlus::rndmStepFlag = false;
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G4bool G4eEnergyLossPlus::EnlossFlucFlag = true;
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G4double G4eEnergyLossPlus::dRoverRange = 20*perCent;
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G4double G4eEnergyLossPlus::finalRange = 200*micrometer;
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G4double G4eEnergyLossPlus::c1lim = dRoverRange ;
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G4double G4eEnergyLossPlus::c2lim = 2.*(1.-dRoverRange)*finalRange ;
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G4double G4eEnergyLossPlus::c3lim = -(1.-dRoverRange)*finalRange*finalRange;
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G4double G4eEnergyLossPlus::MinDeltaCutInRange = 0.010*mm ;
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G4double* G4eEnergyLossPlus::MinDeltaEnergy = NULL ;
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G4PhysicsTable* G4eEnergyLossPlus::theDEDXElectronTable = NULL;
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G4PhysicsTable* G4eEnergyLossPlus::theDEDXPositronTable = NULL;
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G4PhysicsTable* G4eEnergyLossPlus::theRangeElectronTable = NULL;
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G4PhysicsTable* G4eEnergyLossPlus::theRangePositronTable = NULL;
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G4PhysicsTable* G4eEnergyLossPlus::theInverseRangeElectronTable = NULL;
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G4PhysicsTable* G4eEnergyLossPlus::theInverseRangePositronTable = NULL;
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G4PhysicsTable* G4eEnergyLossPlus::theLabTimeElectronTable = NULL;
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G4PhysicsTable* G4eEnergyLossPlus::theLabTimePositronTable = NULL;
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G4PhysicsTable* G4eEnergyLossPlus::theProperTimeElectronTable = NULL;
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G4PhysicsTable* G4eEnergyLossPlus::theProperTimePositronTable = NULL;
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G4PhysicsTable* G4eEnergyLossPlus::theeRangeCoeffATable = NULL;
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G4PhysicsTable* G4eEnergyLossPlus::theeRangeCoeffBTable = NULL;
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G4PhysicsTable* G4eEnergyLossPlus::theeRangeCoeffCTable = NULL;
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G4PhysicsTable* G4eEnergyLossPlus::thepRangeCoeffATable = NULL;
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G4PhysicsTable* G4eEnergyLossPlus::thepRangeCoeffBTable = NULL;
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G4PhysicsTable* G4eEnergyLossPlus::thepRangeCoeffCTable = NULL;
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G4EnergyLossMessenger* G4eEnergyLossPlus::eLossMessenger = NULL;
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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// constructor and destructor
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G4eEnergyLossPlus::G4eEnergyLossPlus(const G4String& processName)
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: G4VContinuousDiscreteProcess (processName),
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theLossTable(NULL),
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Charge(-1.),lastCharge(0.),
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theDEDXTable(NULL),theRangeTable(NULL),
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theRangeCoeffATable(NULL),
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theRangeCoeffBTable(NULL),
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theRangeCoeffCTable(NULL),
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lastMaterial(NULL),
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LowestKineticEnergy(1.00*keV),
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HighestKineticEnergy(100.*TeV),
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MinKineticEnergy(1.*eV),
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linLossLimit(0.02),
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MaxExcitationNumber (1.e6),
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probLimFluct (0.01),
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nmaxDirectFluct (100),
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nmaxCont1(4),
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nmaxCont2(16),
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c1N(2.86e-23*MeV*mm*mm),
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c2N(c1N*MeV/10.),
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Ndeltamax(100)
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{
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//create (only once) EnergyLoss messenger
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if(!eLossMessenger) eLossMessenger = new G4EnergyLossMessenger();
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4eEnergyLossPlus::~G4eEnergyLossPlus()
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{
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if (theLossTable)
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{
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theLossTable->clearAndDestroy();
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delete theLossTable;
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if(MinDeltaEnergy) delete MinDeltaEnergy ;
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4eEnergyLossPlus::BuildDEDXTable(
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const G4ParticleDefinition& aParticleType)
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{
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ParticleMass = aParticleType.GetPDGMass();
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// calculate data members TotBin,LOGRTable,RTable first
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G4double binning = dRoverRange;
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G4double lrate = log(HighestKineticEnergy/LowestKineticEnergy);
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G4int nbin = G4int(lrate/log(1.+binning) + 0.5 );
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nbin = (nbin+25)/50;
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TotBin =50*nbin ;
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if (TotBin<50) TotBin = 50;
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if (TotBin>500) TotBin = 500;
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LOGRTable=lrate/TotBin;
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RTable =exp(LOGRTable);
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// Build energy loss table as a sum of the energy loss due to the
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// different processes.
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//
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const G4MaterialTable* theMaterialTable=G4Material::GetMaterialTable();
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G4int numOfMaterials = theMaterialTable->length();
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// create table for the total energy loss
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if (&aParticleType==G4Electron::Electron())
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{
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RecorderOfProcess=RecorderOfElectronProcess;
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CounterOfProcess=CounterOfElectronProcess;
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if (CounterOfProcess == NbOfProcesses)
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{
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if (theDEDXElectronTable)
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{
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theDEDXElectronTable->clearAndDestroy();
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delete theDEDXElectronTable;
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}
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theDEDXElectronTable = new G4PhysicsTable(numOfMaterials);
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theDEDXTable = theDEDXElectronTable;
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}
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}
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if (&aParticleType==G4Positron::Positron())
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{
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RecorderOfProcess=RecorderOfPositronProcess;
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CounterOfProcess=CounterOfPositronProcess;
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if (CounterOfProcess == NbOfProcesses)
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{
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if (theDEDXPositronTable)
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{
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theDEDXPositronTable->clearAndDestroy();
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delete theDEDXPositronTable;
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}
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theDEDXPositronTable = new G4PhysicsTable(numOfMaterials);
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theDEDXTable = theDEDXPositronTable;
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}
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}
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if (CounterOfProcess == NbOfProcesses)
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{
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// fill the tables
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// loop for materials
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G4double LowEdgeEnergy , Value;
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G4bool isOutRange;
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G4PhysicsTable* pointer;
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for (G4int J=0; J<numOfMaterials; J++)
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{
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// create physics vector and fill it
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G4PhysicsLogVector* aVector = new G4PhysicsLogVector(
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LowestKineticEnergy, HighestKineticEnergy, TotBin);
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// loop for the kinetic energy
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for (G4int i=0; i<TotBin; i++)
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{
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LowEdgeEnergy = aVector->GetLowEdgeEnergy(i) ;
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//here comes the sum of the different tables created by the
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//processes (ionisation,bremsstrahlung,etc...)
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Value = 0.;
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for (G4int process=0; process < NbOfProcesses; process++)
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{
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pointer= RecorderOfProcess[process];
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Value += (*pointer)[J]->GetValue(LowEdgeEnergy,isOutRange);
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}
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aVector->PutValue(i,Value) ;
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}
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theDEDXTable->insert(aVector) ;
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}
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//reset counter to zero
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if (&aParticleType==G4Electron::Electron()) CounterOfElectronProcess=0;
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if (&aParticleType==G4Positron::Positron()) CounterOfPositronProcess=0;
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// Build range table
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BuildRangeTable(aParticleType);
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// Build lab/proper time tables
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BuildTimeTables(aParticleType);
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// Build coeff tables for the energy loss calculation
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BuildRangeCoeffATable(aParticleType);
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BuildRangeCoeffBTable(aParticleType);
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BuildRangeCoeffCTable(aParticleType);
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// invert the range table
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BuildInverseRangeTable(aParticleType);
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// make the energy loss and the range table available
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const G4double lowestKineticEnergy (1.00*keV);
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const G4double highestKineticEnergy(100.*TeV);
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G4EnergyLossTables::Register(&aParticleType,
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(&aParticleType==G4Electron::Electron())?
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theDEDXElectronTable: theDEDXPositronTable,
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(&aParticleType==G4Electron::Electron())?
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theRangeElectronTable: theRangePositronTable,
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(&aParticleType==G4Electron::Electron())?
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theInverseRangeElectronTable: theInverseRangePositronTable,
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(&aParticleType==G4Electron::Electron())?
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theLabTimeElectronTable: theLabTimePositronTable,
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(&aParticleType==G4Electron::Electron())?
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theProperTimeElectronTable: theProperTimePositronTable,
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lowestKineticEnergy, highestKineticEnergy, 1.,TotBin);
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if(&aParticleType==G4Electron::Electron())
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{
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// create array for the min. delta cuts in kinetic energy
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G4double absLowerLimit = 1.*keV ;
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G4cout << endl;
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G4cout.precision(5) ;
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G4cout << " eIoni+ Minimum Delta cut in range=" << MinDeltaCutInRange/mm
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<< " mm." << endl;
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G4cout << " min. delta energies (keV) " << endl;
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G4cout << " material min.delta energy " << endl;
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G4cout << endl;
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if(MinDeltaEnergy) delete MinDeltaEnergy ;
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MinDeltaEnergy = new G4double [numOfMaterials] ;
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G4double Tlowerlimit = 1.*keV ;
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for(G4int mat=0; mat<numOfMaterials; mat++)
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{
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MinDeltaEnergy[mat] = G4EnergyLossTables::GetPreciseEnergyFromRange(
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G4Electron::Electron(),MinDeltaCutInRange,
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(*theMaterialTable)(mat)) ;
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if(MinDeltaEnergy[mat]<absLowerLimit)
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MinDeltaEnergy[mat] = absLowerLimit ;
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if(MinDeltaEnergy[mat]<Tlowerlimit) MinDeltaEnergy[mat]=Tlowerlimit ;
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G4cout << setw(20) << (*theMaterialTable)(mat)->GetName()
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<< setw(15) << MinDeltaEnergy[mat]/keV << endl;
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}
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}
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4eEnergyLossPlus::BuildRangeTable(
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const G4ParticleDefinition& aParticleType)
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{
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// Build range table from the energy loss table
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const G4MaterialTable* theMaterialTable=G4Material::GetMaterialTable();
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G4int numOfMaterials = theMaterialTable->length();
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if (&aParticleType == G4Electron::Electron())
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{
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if (theRangeElectronTable)
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{ theRangeElectronTable->clearAndDestroy();
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delete theRangeElectronTable;
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}
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theRangeElectronTable = new G4PhysicsTable(numOfMaterials);
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theRangeTable = theRangeElectronTable;
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}
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if (&aParticleType == G4Positron::Positron())
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{
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if (theRangePositronTable)
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{ theRangePositronTable->clearAndDestroy();
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delete theRangePositronTable;
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}
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theRangePositronTable = new G4PhysicsTable(numOfMaterials);
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theRangeTable = theRangePositronTable ;
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}
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// loop for materials
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for (G4int J=0; J<numOfMaterials; J++)
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{
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G4PhysicsLogVector* aVector = new G4PhysicsLogVector(LowestKineticEnergy,
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HighestKineticEnergy,TotBin);
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BuildRangeVector(J, aVector);
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theRangeTable->insert(aVector);
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4eEnergyLossPlus::BuildTimeTables(
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const G4ParticleDefinition& aParticleType)
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{
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// Build time tables from the energy loss table
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const G4MaterialTable* theMaterialTable=G4Material::GetMaterialTable();
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G4int numOfMaterials = theMaterialTable->length();
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if (&aParticleType == G4Electron::Electron())
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{
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if (theLabTimeElectronTable)
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{ theLabTimeElectronTable->clearAndDestroy();
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delete theLabTimeElectronTable;
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}
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theLabTimeElectronTable = new G4PhysicsTable(numOfMaterials);
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theLabTimeTable = theLabTimeElectronTable;
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if (theProperTimeElectronTable)
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{ theProperTimeElectronTable->clearAndDestroy();
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delete theProperTimeElectronTable;
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}
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theProperTimeElectronTable = new G4PhysicsTable(numOfMaterials);
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theProperTimeTable = theProperTimeElectronTable ;
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}
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if (&aParticleType == G4Positron::Positron())
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{
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if (theLabTimePositronTable)
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{ theLabTimePositronTable->clearAndDestroy();
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delete theLabTimePositronTable;
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}
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theLabTimePositronTable = new G4PhysicsTable(numOfMaterials);
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theLabTimeTable = theLabTimePositronTable ;
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if (theProperTimePositronTable)
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{ theProperTimePositronTable->clearAndDestroy();
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delete theProperTimePositronTable;
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}
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theProperTimePositronTable = new G4PhysicsTable(numOfMaterials);
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theProperTimeTable = theProperTimePositronTable ;
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}
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// loop for materials
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for (G4int J=0; J<numOfMaterials; J++)
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{
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G4PhysicsLogVector* aVector = new G4PhysicsLogVector(LowestKineticEnergy,
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HighestKineticEnergy,TotBin);
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BuildLabTimeVector(J, aVector);
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theLabTimeTable->insert(aVector);
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G4PhysicsLogVector* bVector = new G4PhysicsLogVector(LowestKineticEnergy,
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HighestKineticEnergy,TotBin);
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BuildProperTimeVector(J, bVector);
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theProperTimeTable->insert(bVector);
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4eEnergyLossPlus::BuildRangeVector(G4int materialIndex,
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G4PhysicsLogVector* rangeVector)
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{
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// create range vector for a material
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G4int maxbint=100;
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G4bool isOut;
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G4double tlim=10.*keV,factor=2.*electron_mass_c2 ;
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G4PhysicsVector* physicsVector= (*theDEDXTable)[materialIndex];
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// low energy part first...
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G4double losslim = physicsVector->GetValue(tlim,isOut);
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G4double taulim = tlim/electron_mass_c2;
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G4double clim = losslim/sqrt(taulim);
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G4double ltaulim = log(taulim);
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G4double ltaumax = log(HighestKineticEnergy/electron_mass_c2);
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G4int i=-1;
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G4double Value, oldValue(0.);
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G4double LowEdgeEnergy, rangelim;
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G4double tau,tauold;
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do
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{
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i += 1 ;
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LowEdgeEnergy = rangeVector->GetLowEdgeEnergy(i);
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tau = LowEdgeEnergy/electron_mass_c2;
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if (tau <= taulim) Value = factor*sqrt(tau)/clim;
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else {
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rangelim = factor*taulim/losslim ;
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ltaulow = log(taulim);
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ltauhigh = log(tau);
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Value = rangelim+RangeIntLog(physicsVector,maxbint);
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}
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rangeVector->PutValue(i,Value);
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oldValue = Value;
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tauold = tau;
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} while (tau<=taulim);
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i += 1;
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for (G4int j=i; j<TotBin; j++)
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{
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LowEdgeEnergy = rangeVector->GetLowEdgeEnergy(j);
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tau = LowEdgeEnergy/electron_mass_c2;
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ltaulow = log(tauold);
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ltauhigh = log(tau);
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Value = oldValue+RangeIntLog(physicsVector,maxbint);
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rangeVector->PutValue(j,Value);
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oldValue = Value;
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tauold = tau;
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4eEnergyLossPlus::BuildLabTimeVector(G4int materialIndex,
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G4PhysicsLogVector* timeVector)
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// create lab time vector for a material
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{
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G4int maxbint=100;
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G4bool isOut;
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G4double tlim=5.*keV,parlowen=0.4,ppar=0.5-parlowen ;
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G4PhysicsVector* physicsVector= (*theDEDXTable)[materialIndex];
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// low energy part first...
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G4double losslim = physicsVector->GetValue(tlim,isOut);
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G4double taulim = tlim/ParticleMass ;
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G4double clim = sqrt(ParticleMass*tlim/2.)/(c_light*losslim*ppar);
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G4double ltaulim = log(taulim);
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G4double ltaumax = log(HighestKineticEnergy/ParticleMass) ;
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|
|
G4int i=-1;
|
|
G4double Value, oldValue(0.);
|
|
G4double LowEdgeEnergy, timelim;
|
|
G4double tau,tauold;
|
|
|
|
do
|
|
{
|
|
i += 1 ;
|
|
LowEdgeEnergy = timeVector->GetLowEdgeEnergy(i);
|
|
tau = LowEdgeEnergy/ParticleMass;
|
|
if (tau <= taulim) Value = clim*exp(ppar*log(tau/taulim));
|
|
else {
|
|
timelim = clim;
|
|
ltaulow = log(taulim);
|
|
ltauhigh = log(tau);
|
|
Value = timelim+LabTimeIntLog(physicsVector,maxbint);
|
|
}
|
|
timeVector->PutValue(i,Value);
|
|
oldValue = Value;
|
|
tauold = tau;
|
|
|
|
} while (tau<=taulim) ;
|
|
|
|
i += 1 ;
|
|
|
|
for (G4int j=i; j<TotBin; j++)
|
|
{
|
|
LowEdgeEnergy = timeVector->GetLowEdgeEnergy(j);
|
|
tau = LowEdgeEnergy/ParticleMass;
|
|
ltaulow = log(tauold);
|
|
ltauhigh = log(tau);
|
|
Value = oldValue+LabTimeIntLog(physicsVector,maxbint);
|
|
timeVector->PutValue(j,Value);
|
|
oldValue = Value ;
|
|
tauold = tau ;
|
|
}
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
|
|
|
|
void G4eEnergyLossPlus::BuildProperTimeVector(G4int materialIndex,
|
|
G4PhysicsLogVector* timeVector)
|
|
{
|
|
// create lab time vector for a material
|
|
G4int maxbint=100;
|
|
G4bool isOut;
|
|
G4double tlim=5.*keV,parlowen=0.4,ppar=0.5-parlowen ;
|
|
|
|
G4PhysicsVector* physicsVector= (*theDEDXTable)[materialIndex];
|
|
|
|
// low energy part first...
|
|
G4double losslim = physicsVector->GetValue(tlim,isOut);
|
|
G4double taulim = tlim/ParticleMass;
|
|
G4double clim = sqrt(ParticleMass*tlim/2.)/(c_light*losslim*ppar);
|
|
G4double ltaulim = log(taulim);
|
|
G4double ltaumax = log(HighestKineticEnergy/ParticleMass);
|
|
|
|
G4int i=-1;
|
|
G4double Value, oldValue(0.);
|
|
G4double LowEdgeEnergy, timelim;
|
|
G4double tau,tauold;
|
|
|
|
do
|
|
{
|
|
i += 1 ;
|
|
LowEdgeEnergy = timeVector->GetLowEdgeEnergy(i);
|
|
tau = LowEdgeEnergy/ParticleMass ;
|
|
if (tau <= taulim) Value = clim*exp(ppar*log(tau/taulim));
|
|
else {
|
|
timelim = clim;
|
|
ltaulow = log(taulim);
|
|
ltauhigh = log(tau);
|
|
Value = timelim+ProperTimeIntLog(physicsVector,maxbint);
|
|
}
|
|
timeVector->PutValue(i,Value);
|
|
oldValue = Value;
|
|
tauold = tau;
|
|
|
|
} while (tau<=taulim) ;
|
|
|
|
i += 1 ;
|
|
|
|
for (G4int j=i; j<TotBin; j++)
|
|
{
|
|
LowEdgeEnergy = timeVector->GetLowEdgeEnergy(j);
|
|
tau = LowEdgeEnergy/ParticleMass;
|
|
ltaulow = log(tauold);
|
|
ltauhigh = log(tau);
|
|
Value = oldValue+ProperTimeIntLog(physicsVector,maxbint);
|
|
timeVector->PutValue(j,Value);
|
|
oldValue = Value;
|
|
tauold = tau;
|
|
}
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
|
|
|
|
G4double G4eEnergyLossPlus::RangeIntLog(G4PhysicsVector* physicsVector,
|
|
G4int nbin)
|
|
// num. integration, logarithmic binning
|
|
{
|
|
G4double taui,lossi,ci;
|
|
G4bool isOut;
|
|
|
|
G4double ltt = ltauhigh-ltaulow;
|
|
G4double dltau = ltt/nbin;
|
|
G4double Value = 0.;
|
|
|
|
for (G4int i=0; i<=nbin; i++)
|
|
{
|
|
taui = exp(ltaulow+dltau*i);
|
|
lossi = physicsVector->GetValue(ParticleMass*taui,isOut);
|
|
if ((i==0)||(i==nbin)) ci=0.5; else ci=1.;
|
|
Value += ci*taui/lossi;
|
|
}
|
|
|
|
return Value*ParticleMass*dltau;
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
|
|
|
|
G4double G4eEnergyLossPlus::LabTimeIntLog(G4PhysicsVector* physicsVector,
|
|
G4int nbin)
|
|
// num. integration, logarithmic binning
|
|
{
|
|
G4double taui,ti,lossi,ci;
|
|
G4bool isOut;
|
|
|
|
G4double ltt = ltauhigh-ltaulow;
|
|
G4double dltau = ltt/nbin;
|
|
G4double Value = 0.;
|
|
|
|
for (G4int i=0; i<=nbin; i++)
|
|
{
|
|
taui = exp(ltaulow+dltau*i);
|
|
ti = ParticleMass*taui;
|
|
lossi = physicsVector->GetValue(ti,isOut);
|
|
if ((i==0)||(i==nbin)) ci=0.5; else ci=1.;
|
|
Value += ci*taui*(ti+ParticleMass)/(sqrt(ti*(ti+2.*ParticleMass))*lossi);
|
|
}
|
|
|
|
return Value*ParticleMass*dltau/c_light;
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
|
|
|
|
G4double G4eEnergyLossPlus::ProperTimeIntLog(G4PhysicsVector* physicsVector,
|
|
G4int nbin)
|
|
// num. integration, logarithmic binning
|
|
{
|
|
G4double taui,ti,lossi,ci;
|
|
G4bool isOut;
|
|
|
|
G4double ltt = ltauhigh-ltaulow;
|
|
G4double dltau = ltt/nbin;
|
|
G4double Value = 0.;
|
|
|
|
for (G4int i=0; i<=nbin; i++)
|
|
{
|
|
taui = exp(ltaulow+dltau*i);
|
|
ti = ParticleMass*taui;
|
|
lossi = physicsVector->GetValue(ti,isOut);
|
|
if ((i==0)||(i==nbin)) ci=0.5; else ci=1.;
|
|
Value += ci*taui*ParticleMass/(sqrt(ti*(ti+2.*ParticleMass))*lossi);
|
|
}
|
|
|
|
return Value*ParticleMass*dltau/c_light;
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
|
|
|
|
void G4eEnergyLossPlus::BuildRangeCoeffATable(
|
|
const G4ParticleDefinition& aParticleType)
|
|
{
|
|
// Build tables of coefficients for the energy loss calculation
|
|
// create table for coefficients "A"
|
|
|
|
const G4MaterialTable* theMaterialTable = G4Material::GetMaterialTable();
|
|
G4int numOfMaterials = theMaterialTable->length();
|
|
|
|
if (&aParticleType==G4Electron::Electron())
|
|
{
|
|
if (theeRangeCoeffATable) {theeRangeCoeffATable->clearAndDestroy();
|
|
delete theeRangeCoeffATable;
|
|
}
|
|
theeRangeCoeffATable = new G4PhysicsTable(numOfMaterials);
|
|
theRangeCoeffATable = theeRangeCoeffATable ;
|
|
}
|
|
if (&aParticleType==G4Positron::Positron())
|
|
{
|
|
if (thepRangeCoeffATable) {thepRangeCoeffATable->clearAndDestroy();
|
|
delete thepRangeCoeffATable;
|
|
}
|
|
thepRangeCoeffATable = new G4PhysicsTable(numOfMaterials);
|
|
theRangeCoeffATable = thepRangeCoeffATable;
|
|
}
|
|
|
|
G4double R1 = RTable+1., R2 = RTable*RTable ;
|
|
G4double w = R1*(RTable-1.)*(RTable-1.);
|
|
G4double w1 = RTable/w , w2 = -RTable*R1/w , w3 = R2/w ;
|
|
G4double Ti , Tim , Tip , Ri , Rim , Rip , Value;
|
|
G4bool isOut;
|
|
|
|
// loop for materials
|
|
|
|
for (G4int J=0; J<numOfMaterials; J++)
|
|
{
|
|
G4PhysicsLinearVector* aVector = new G4PhysicsLinearVector(0.,TotBin,TotBin);
|
|
|
|
// loop for kinetic energy
|
|
G4PhysicsVector* rangeVector= (*theRangeTable)[J];
|
|
Ti = LowestKineticEnergy;
|
|
|
|
for (G4int i=0; i<TotBin; i++)
|
|
{
|
|
Ri = rangeVector->GetValue(Ti,isOut);
|
|
if (i==0) Rim = Ri/sqrt(RTable);
|
|
else { Tim = Ti/RTable; Rim = rangeVector->GetValue(Tim,isOut);}
|
|
Tip = Ti*RTable;
|
|
Rip = rangeVector->GetValue(Tip,isOut);
|
|
if (i < (TotBin-1)) Value = (w1*Rip + w2*Ri + w3*Rim)/(Ti*Ti);
|
|
else Value = 0.;
|
|
aVector->PutValue(i,Value);
|
|
Ti *= RTable;
|
|
}
|
|
|
|
theRangeCoeffATable->insert(aVector);
|
|
}
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
|
|
|
|
void G4eEnergyLossPlus::BuildRangeCoeffBTable(
|
|
const G4ParticleDefinition& aParticleType)
|
|
{
|
|
// Build tables of coefficients for the energy loss calculation
|
|
// create table for coefficients "B"
|
|
|
|
const G4MaterialTable* theMaterialTable = G4Material::GetMaterialTable();
|
|
G4int numOfMaterials = theMaterialTable->length();
|
|
|
|
if (&aParticleType==G4Electron::Electron())
|
|
{
|
|
if (theeRangeCoeffBTable) {theeRangeCoeffBTable->clearAndDestroy();
|
|
delete theeRangeCoeffBTable;
|
|
}
|
|
theeRangeCoeffBTable = new G4PhysicsTable(numOfMaterials);
|
|
theRangeCoeffBTable = theeRangeCoeffBTable;
|
|
}
|
|
if (&aParticleType==G4Positron::Positron())
|
|
{
|
|
if (thepRangeCoeffBTable) {thepRangeCoeffBTable->clearAndDestroy();
|
|
delete thepRangeCoeffBTable;
|
|
}
|
|
thepRangeCoeffBTable = new G4PhysicsTable(numOfMaterials);
|
|
theRangeCoeffBTable = thepRangeCoeffBTable;
|
|
}
|
|
|
|
G4double R1 = RTable+1., R2 = RTable*RTable;
|
|
G4double w = R1*(RTable-1.)*(RTable-1.);
|
|
G4double w1 = -R1/w , w2 = R1*(R2+1.)/w , w3 = -R2*R1/w ;
|
|
G4double Ti , Tim , Tip , Ri , Rim , Rip , Value ;
|
|
G4bool isOut;
|
|
|
|
// loop for materials
|
|
|
|
for (G4int J=0; J<numOfMaterials; J++)
|
|
{
|
|
G4PhysicsLinearVector* aVector = new G4PhysicsLinearVector(0.,TotBin,TotBin);
|
|
|
|
// loop for kinetic energy
|
|
G4PhysicsVector* rangeVector = (*theRangeTable)[J];
|
|
Ti = LowestKineticEnergy;
|
|
|
|
for ( G4int i=0; i<TotBin; i++)
|
|
{
|
|
Ri = rangeVector->GetValue(Ti,isOut);
|
|
if (i==0) Rim = Ri/sqrt(RTable);
|
|
else { Tim = Ti/RTable; Rim = rangeVector->GetValue(Tim,isOut);}
|
|
Tip = Ti*RTable;
|
|
Rip = rangeVector->GetValue(Tip,isOut);
|
|
if (i < (TotBin-1)) Value = (w1*Rip + w2*Ri + w3*Rim)/Ti;
|
|
else Value = RTable*(Ri-Rim)/((RTable-1.)*Ti);
|
|
aVector->PutValue(i,Value);
|
|
Ti *= RTable;
|
|
}
|
|
|
|
theRangeCoeffBTable->insert(aVector);
|
|
}
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
|
|
|
|
void G4eEnergyLossPlus::BuildRangeCoeffCTable(
|
|
const G4ParticleDefinition& aParticleType)
|
|
{
|
|
// Build tables of coefficients for the energy loss calculation
|
|
// create table for coefficients "C"
|
|
|
|
const G4MaterialTable* theMaterialTable = G4Material::GetMaterialTable();
|
|
G4int numOfMaterials = theMaterialTable->length();
|
|
|
|
if (&aParticleType==G4Electron::Electron())
|
|
{
|
|
if (theeRangeCoeffCTable) {theeRangeCoeffCTable->clearAndDestroy();
|
|
delete theeRangeCoeffCTable;
|
|
}
|
|
theeRangeCoeffCTable = new G4PhysicsTable(numOfMaterials);
|
|
theRangeCoeffCTable = theeRangeCoeffCTable;
|
|
}
|
|
if (&aParticleType==G4Positron::Positron())
|
|
{
|
|
if (thepRangeCoeffCTable) {thepRangeCoeffCTable->clearAndDestroy();
|
|
delete thepRangeCoeffCTable;
|
|
}
|
|
thepRangeCoeffCTable = new G4PhysicsTable(numOfMaterials);
|
|
theRangeCoeffCTable = thepRangeCoeffCTable ;
|
|
}
|
|
|
|
G4double R1 = RTable+1., R2 = RTable*RTable;
|
|
G4double w = R1*(RTable-1.)*(RTable-1.);
|
|
G4double w1 = 1./w , w2 = -RTable*R1/w , w3 = RTable*R2/w;
|
|
G4double Ti , Tim , Tip , Ri , Rim , Rip , Value;
|
|
G4bool isOut;
|
|
|
|
// loop for materials
|
|
for (G4int J=0; J<numOfMaterials; J++)
|
|
{
|
|
G4PhysicsLinearVector* aVector = new G4PhysicsLinearVector(0.,TotBin,TotBin);
|
|
|
|
// loop for kinetic energy
|
|
G4PhysicsVector* rangeVector = (*theRangeTable)[J];
|
|
Ti = LowestKineticEnergy;
|
|
|
|
for ( G4int i=0; i<TotBin; i++)
|
|
{
|
|
Ri = rangeVector->GetValue(Ti,isOut);
|
|
if (i==0) Rim = Ri/sqrt(RTable);
|
|
else { Tim = Ti/RTable; Rim = rangeVector->GetValue(Tim,isOut);}
|
|
Tip = Ti*RTable;
|
|
Rip = rangeVector->GetValue(Tip,isOut);
|
|
if (i < (TotBin-1)) Value = w1*Rip + w2*Ri + w3*Rim;
|
|
else Value = (-Ri+RTable*Rim)/(RTable-1.);
|
|
aVector->PutValue(i,Value);
|
|
Ti *= RTable;
|
|
}
|
|
|
|
theRangeCoeffCTable->insert(aVector);
|
|
}
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
|
|
|
|
void G4eEnergyLossPlus::BuildInverseRangeTable(
|
|
const G4ParticleDefinition& aParticleType)
|
|
{
|
|
// Build inverse table of the range table
|
|
|
|
G4double SmallestRange,BiggestRange;
|
|
G4bool isOut;
|
|
|
|
// create table
|
|
|
|
const G4MaterialTable* theMaterialTable = G4Material::GetMaterialTable();
|
|
G4int numOfMaterials = theMaterialTable->length();
|
|
|
|
if (&aParticleType == G4Electron::Electron())
|
|
{
|
|
if (theInverseRangeElectronTable)
|
|
{
|
|
theInverseRangeElectronTable->clearAndDestroy();
|
|
delete theInverseRangeElectronTable;
|
|
}
|
|
theInverseRangeElectronTable = new G4PhysicsTable(numOfMaterials);
|
|
theInverseRangeTable = theInverseRangeElectronTable;
|
|
theRangeTable = theRangeElectronTable;
|
|
theDEDXTable = theDEDXElectronTable;
|
|
theRangeCoeffATable = theeRangeCoeffATable;
|
|
theRangeCoeffBTable = theeRangeCoeffBTable;
|
|
theRangeCoeffCTable = theeRangeCoeffCTable;
|
|
}
|
|
|
|
if (&aParticleType == G4Positron::Positron())
|
|
{
|
|
if (theInverseRangePositronTable)
|
|
{
|
|
theInverseRangePositronTable->clearAndDestroy();
|
|
delete theInverseRangePositronTable;
|
|
}
|
|
theInverseRangePositronTable = new G4PhysicsTable(numOfMaterials);
|
|
theInverseRangeTable = theInverseRangePositronTable;
|
|
theRangeTable = theRangePositronTable;
|
|
theDEDXTable = theDEDXPositronTable;
|
|
theRangeCoeffATable = thepRangeCoeffATable;
|
|
theRangeCoeffBTable = thepRangeCoeffBTable;
|
|
theRangeCoeffCTable = thepRangeCoeffCTable;
|
|
}
|
|
|
|
// loop for materials
|
|
|
|
for (G4int J=0; J<numOfMaterials; J++)
|
|
{
|
|
SmallestRange = (*theRangeTable)(J)->GetValue(LowestKineticEnergy ,isOut);
|
|
BiggestRange = (*theRangeTable)(J)->GetValue(HighestKineticEnergy,isOut);
|
|
|
|
G4PhysicsLogVector* aVector = new G4PhysicsLogVector(SmallestRange,
|
|
BiggestRange,TotBin);
|
|
InvertRangeVector(J, aVector);
|
|
|
|
theInverseRangeTable->insert(aVector);
|
|
}
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
|
|
|
|
void G4eEnergyLossPlus::InvertRangeVector(G4int materialIndex,
|
|
G4PhysicsLogVector* aVector)
|
|
{
|
|
// invert range vector for a material
|
|
|
|
G4double LowEdgeRange,A,B,C,discr,KineticEnergy;
|
|
|
|
G4double Tbin = LowestKineticEnergy/RTable;
|
|
G4double rangebin = 0.0;
|
|
G4int binnumber = -1;
|
|
G4bool isOut;
|
|
|
|
//loop for range values
|
|
for (G4int i=0; i<TotBin; i++)
|
|
{
|
|
LowEdgeRange = aVector->GetLowEdgeEnergy(i);
|
|
while ((rangebin < LowEdgeRange) && (binnumber < TotBin))
|
|
{
|
|
binnumber += 1;
|
|
Tbin *= RTable;
|
|
rangebin = (*theRangeTable)(materialIndex)->GetValue(Tbin,isOut);
|
|
}
|
|
|
|
if (binnumber == 0) KineticEnergy = LowestKineticEnergy;
|
|
else if (binnumber == TotBin-1) KineticEnergy = HighestKineticEnergy;
|
|
else
|
|
{
|
|
A = (*(*theRangeCoeffATable)(materialIndex))(binnumber-1);
|
|
B = (*(*theRangeCoeffBTable)(materialIndex))(binnumber-1);
|
|
C = (*(*theRangeCoeffCTable)(materialIndex))(binnumber-1);
|
|
if(A==0.)
|
|
KineticEnergy = (LowEdgeRange -C )/B ;
|
|
else
|
|
{
|
|
discr = B*B - 4.*A*(C-LowEdgeRange);
|
|
discr = discr>0. ? sqrt(discr) : 0.;
|
|
KineticEnergy = 0.5*(discr-B)/A ;
|
|
}
|
|
}
|
|
|
|
aVector->PutValue(i,KineticEnergy) ;
|
|
}
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
|
|
|
|
|
|
G4VParticleChange* G4eEnergyLossPlus::AlongStepDoIt( const G4Track& trackData,
|
|
const G4Step& stepData)
|
|
{
|
|
// compute the energy loss after a Step
|
|
// get particle and material pointers from trackData
|
|
const G4DynamicParticle* aParticle = trackData.GetDynamicParticle();
|
|
G4double E = aParticle->GetKineticEnergy() ;
|
|
|
|
G4Material* aMaterial = trackData.GetMaterial();
|
|
G4int index = aMaterial->GetIndex();
|
|
G4double Step = stepData.GetStepLength();
|
|
|
|
aParticleChange.Initialize(trackData);
|
|
|
|
G4double MeanLoss, finalT;
|
|
|
|
if (E < MinKineticEnergy) finalT = 0.;
|
|
|
|
else if (E<=LowestKineticEnergy)
|
|
{
|
|
if (Step >= fRangeNow) finalT = 0.;
|
|
else finalT = E - Step*fdEdx;
|
|
}
|
|
|
|
else if (E>=HighestKineticEnergy) finalT = E - Step*fdEdx;
|
|
|
|
else if (Step >= fRangeNow) finalT = 0.;
|
|
|
|
else
|
|
{
|
|
if(Step/fRangeNow < linLossLimit) finalT = E-Step*fdEdx ;
|
|
else
|
|
{
|
|
if (Charge<0.) finalT = G4EnergyLossTables::GetPreciseEnergyFromRange
|
|
(G4Electron::Electron(),fRangeNow-Step,aMaterial);
|
|
else finalT = G4EnergyLossTables::GetPreciseEnergyFromRange
|
|
(G4Positron::Positron(),fRangeNow-Step,aMaterial);
|
|
}
|
|
}
|
|
|
|
if(finalT < MinKineticEnergy) finalT = 0. ;
|
|
|
|
MeanLoss = E - finalT ;
|
|
|
|
// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
|
|
G4double MinDeltaEnergyNow = MinDeltaEnergy[index] ;
|
|
G4double TmintoProduceDelta=0.5*(3.-Charge)*MinDeltaEnergyNow ;
|
|
if((E > TmintoProduceDelta) && (MeanLoss > MinDeltaEnergyNow)
|
|
&& (finalT > MinKineticEnergy))
|
|
{
|
|
G4double rcut,Tc,T0,presafety,postsafety,safety,
|
|
delta,fragment ;
|
|
G4double frperstep,x1,y1,z1,dx,dy,dz,dTime,time0,DeltaTime;
|
|
G4double epsil= MinKineticEnergy/2. ;
|
|
|
|
if(Charge < 0.)
|
|
{
|
|
rcut=G4Electron::Electron()->GetCuts();
|
|
Tc=G4Electron::Electron()->GetCutsInEnergy()[index];
|
|
// threshold !
|
|
if(Tc > 0.5*E) Tc=0.5*E ;
|
|
}
|
|
else
|
|
{
|
|
rcut=G4Positron::Positron()->GetCuts();
|
|
Tc=G4Positron::Positron()->GetCutsInEnergy()[index];
|
|
// threshold !
|
|
if(Tc > E) Tc=E ;
|
|
}
|
|
// generate subcutoff delta rays only if Tc>MinDeltaEnergy!
|
|
if(Tc > MinDeltaEnergyNow)
|
|
{
|
|
presafety = stepData.GetPreStepPoint()->GetSafety() ;
|
|
|
|
// postsafety = stepData.GetPostStepPoint()->GetSafety() ;
|
|
|
|
G4Navigator *navigator=
|
|
G4TransportationManager::GetTransportationManager()
|
|
->GetNavigatorForTracking();
|
|
postsafety =
|
|
navigator->ComputeSafety(stepData.GetPostStepPoint()->GetPosition());
|
|
|
|
safety=min(presafety,postsafety);
|
|
|
|
if(safety<rcut)
|
|
{
|
|
T0=G4EnergyLossTables::GetPreciseEnergyFromRange(
|
|
G4Electron::Electron(),safety,aMaterial) ;
|
|
|
|
// absolute lower limit for T0
|
|
if(T0<MinDeltaEnergyNow) T0=MinDeltaEnergyNow ;
|
|
// ..................................................................
|
|
|
|
x1=stepData.GetPreStepPoint()->GetPosition().x();
|
|
y1=stepData.GetPreStepPoint()->GetPosition().y();
|
|
z1=stepData.GetPreStepPoint()->GetPosition().z();
|
|
dx=stepData.GetPostStepPoint()->GetPosition().x()-x1 ;
|
|
dy=stepData.GetPostStepPoint()->GetPosition().y()-y1 ;
|
|
dz=stepData.GetPostStepPoint()->GetPosition().z()-z1 ;
|
|
time0=stepData.GetPreStepPoint()->GetGlobalTime();
|
|
dTime=stepData.GetPostStepPoint()->GetGlobalTime()-time0;
|
|
|
|
if((presafety<rcut)&&(postsafety<rcut))
|
|
{
|
|
fragment = Step ;
|
|
frperstep=1. ;
|
|
}
|
|
else if(presafety<rcut)
|
|
{
|
|
delta=presafety*Step/(postsafety-presafety) ;
|
|
fragment=rcut*(Step+delta)/postsafety-delta ;
|
|
frperstep=fragment/Step;
|
|
}
|
|
else if(postsafety<rcut)
|
|
{
|
|
delta=postsafety*Step/(presafety-postsafety) ;
|
|
fragment=rcut*(Step+delta)/presafety-delta ;
|
|
x1 += dx;
|
|
y1 += dy;
|
|
z1 += dz;
|
|
time0 += dTime ;
|
|
frperstep=-fragment/Step;
|
|
}
|
|
|
|
if(fragment>0.)
|
|
{
|
|
// compute nb of delta rays to be generated
|
|
G4int N=int(fragment*(c1N*(1.-T0/Tc)+c2N/E)*
|
|
(aMaterial->GetTotNbOfElectPerVolume())/T0+0.5) ;
|
|
if(N > Ndeltamax)
|
|
N = Ndeltamax ;
|
|
G4double Px,Py,Pz ;
|
|
G4ThreeVector ParticleDirection ;
|
|
ParticleDirection=stepData.GetPostStepPoint()->
|
|
GetMomentumDirection() ;
|
|
Px =ParticleDirection.x() ;
|
|
Py =ParticleDirection.y() ;
|
|
Pz =ParticleDirection.z() ;
|
|
|
|
G4int subdelta = 0;
|
|
|
|
if(N > 0)
|
|
{
|
|
G4double Tkin,Etot,P,T,p,costheta,sintheta,phi,dirx,diry,dirz,
|
|
Pnew,delToverTc,
|
|
sumT,delTkin,delLoss,rate,
|
|
urandom ;
|
|
G4StepPoint *point ;
|
|
|
|
sumT=0.;
|
|
|
|
Tkin = E ;
|
|
Etot = Tkin+electron_mass_c2 ;
|
|
P = sqrt(Tkin*(Etot+electron_mass_c2)) ;
|
|
|
|
aParticleChange.SetNumberOfSecondaries(N);
|
|
do {
|
|
subdelta += 1 ;
|
|
|
|
if((Charge<0.)&&(Tc>0.5*Tkin)) Tc=0.5*Tkin ;
|
|
if((Charge>0.)&&(Tc> Tkin)) Tc= Tkin ;
|
|
|
|
//check if there is enough energy ....
|
|
if((Tkin>TmintoProduceDelta)&&(Tc > T0)&&(MeanLoss>0.))
|
|
{
|
|
delToverTc=1.-T0/Tc ;
|
|
T=T0/(1.-delToverTc*G4UniformRand()) ;
|
|
if(T > MeanLoss) T=MeanLoss ;
|
|
MeanLoss -= T ;
|
|
p=sqrt(T*(T+2.*electron_mass_c2)) ;
|
|
|
|
costheta = T*(Etot+electron_mass_c2)/(P*p) ;
|
|
if(costheta<-1.) costheta=-1.;
|
|
if(costheta> 1.) costheta= 1.;
|
|
|
|
phi=twopi*G4UniformRand() ;
|
|
sintheta=sqrt(1.-costheta*costheta);
|
|
dirx=sintheta*cos(phi);
|
|
diry=sintheta*sin(phi);
|
|
dirz=costheta;
|
|
|
|
sumT += T ;
|
|
|
|
urandom = G4UniformRand() ;
|
|
// distribute x,y,z along Pre-Post !
|
|
G4double xd,yd,zd ;
|
|
xd=x1+frperstep*dx*urandom ;
|
|
yd=y1+frperstep*dy*urandom ;
|
|
zd=z1+frperstep*dz*urandom ;
|
|
G4ThreeVector DeltaPosition(xd,yd,zd) ;
|
|
DeltaTime=time0+frperstep*dTime*urandom ;
|
|
ParticleDirection=stepData.GetPostStepPoint()->
|
|
GetMomentumDirection() ;
|
|
|
|
G4ThreeVector DeltaDirection(dirx,diry,dirz) ;
|
|
DeltaDirection.rotateUz(ParticleDirection);
|
|
|
|
G4DynamicParticle* theDelta = new G4DynamicParticle ;
|
|
theDelta->SetDefinition(G4Electron::Electron());
|
|
theDelta->SetKineticEnergy(T);
|
|
|
|
theDelta->SetMomentumDirection(DeltaDirection.x(),
|
|
DeltaDirection.y(),DeltaDirection.z());
|
|
|
|
// update initial particle,fill ParticleChange
|
|
Tkin -= T ;
|
|
Px =(P*ParticleDirection.x()-p*DeltaDirection.x()) ;
|
|
Py =(P*ParticleDirection.y()-p*DeltaDirection.y()) ;
|
|
Pz =(P*ParticleDirection.z()-p*DeltaDirection.z()) ;
|
|
Pnew = sqrt(Px*Px+Py*Py+Pz*Pz) ;
|
|
Px /= Pnew ;
|
|
Py /= Pnew ;
|
|
Pz /= Pnew ;
|
|
P = Pnew ;
|
|
G4ThreeVector ParticleDirectionnew(Px,Py,Pz) ;
|
|
ParticleDirection = ParticleDirectionnew;
|
|
|
|
G4Track* deltaTrack =
|
|
new G4Track(theDelta,DeltaTime,DeltaPosition);
|
|
deltaTrack->
|
|
SetTouchable(stepData.GetPostStepPoint()->GetTouchable()) ;
|
|
deltaTrack->SetParentID(trackData.GetTrackID()) ;
|
|
|
|
aParticleChange.AddSecondary(deltaTrack) ;
|
|
|
|
}
|
|
|
|
} while (subdelta<N) ;
|
|
|
|
// update the particle direction and kinetic energy
|
|
if(subdelta > 0)
|
|
aParticleChange.SetMomentumChange(Px,Py,Pz) ;
|
|
E = Tkin ;
|
|
|
|
}
|
|
}
|
|
// ................................................................
|
|
}
|
|
}
|
|
}
|
|
|
|
finalT = E - MeanLoss ;
|
|
if(finalT < MinKineticEnergy) finalT = 0. ;
|
|
|
|
// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
|
|
|
|
//now the loss with fluctuation
|
|
if ((EnlossFlucFlag) && (finalT > 0.) && (finalT < E)&&(E > LowestKineticEnergy))
|
|
{
|
|
finalT = E-GetLossWithFluct(aParticle,aMaterial,MeanLoss);
|
|
if (finalT < 0.) finalT = E-MeanLoss;
|
|
}
|
|
|
|
// kill the particle if the kinetic energy <= 0
|
|
if (finalT <= 0. )
|
|
{
|
|
finalT = 0.;
|
|
if (Charge < 0.) aParticleChange.SetStatusChange(fStopAndKill);
|
|
else aParticleChange.SetStatusChange(fStopButAlive);
|
|
}
|
|
|
|
aParticleChange.SetEnergyChange(finalT);
|
|
aParticleChange.SetLocalEnergyDeposit(E-finalT);
|
|
|
|
return &aParticleChange;
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
|
|
|
|
|
|
G4double G4eEnergyLossPlus::GetLossWithFluct(const G4DynamicParticle* aParticle,
|
|
G4Material* aMaterial,
|
|
G4double MeanLoss)
|
|
// calculate actual loss from the mean loss
|
|
// The model used to get the fluctuation is the same as in Glandz in Geant3.
|
|
{
|
|
static const G4double Tlow=10.*keV ;
|
|
|
|
// check if the material has changed ( cache mechanism)
|
|
|
|
if (aMaterial != lastMaterial)
|
|
{
|
|
lastMaterial = aMaterial;
|
|
imat = aMaterial->GetIndex();
|
|
f1Fluct = aMaterial->GetIonisation()->GetF1fluct();
|
|
f2Fluct = aMaterial->GetIonisation()->GetF2fluct();
|
|
e1Fluct = aMaterial->GetIonisation()->GetEnergy1fluct();
|
|
e2Fluct = aMaterial->GetIonisation()->GetEnergy2fluct();
|
|
e1LogFluct = aMaterial->GetIonisation()->GetLogEnergy1fluct();
|
|
e2LogFluct = aMaterial->GetIonisation()->GetLogEnergy2fluct();
|
|
rateFluct = aMaterial->GetIonisation()->GetRateionexcfluct();
|
|
ipotFluct = aMaterial->GetIonisation()->GetMeanExcitationEnergy();
|
|
ipotLogFluct = aMaterial->GetIonisation()->GetLogMeanExcEnergy();
|
|
}
|
|
|
|
G4double threshold,w1,w2,w3,lnw3,C,prob,
|
|
beta2,suma,e0,Em,loss,lossc ,w;
|
|
G4double a1,a2,a3;
|
|
G4long p1,p2,p3;
|
|
G4int nb;
|
|
G4double Corrfac, na,alfa,rfac,namean,sa,alfa1,ea,sea;
|
|
G4double dp1,dnmaxDirectFluct,dp3,dnmaxCont2;
|
|
G4double siga ;
|
|
static const G4double alim=10.;
|
|
|
|
// get particle data
|
|
G4double Tkin = aParticle->GetKineticEnergy();
|
|
if (Charge<0.) threshold =((*G4Electron::Electron()).GetCutsInEnergy())[imat];
|
|
else threshold =((*G4Positron::Positron()).GetCutsInEnergy())[imat];
|
|
|
|
G4double rmass = electron_mass_c2/ParticleMass;
|
|
G4double tau = Tkin/ParticleMass, tau1 = tau+1., tau2 = tau*(tau+2.);
|
|
G4double Tm = 2.*electron_mass_c2*tau2/(1.+2.*tau1*rmass+rmass*rmass)
|
|
-ipotFluct;
|
|
if (Tm < 0.) Tm = 0.;
|
|
else if (Tm > threshold) Tm = threshold;
|
|
|
|
w1 = Tm+ipotFluct;
|
|
w2 = w1/ipotFluct;
|
|
w3 = 2.*electron_mass_c2*tau2;
|
|
lnw3 = log(w3);
|
|
beta2 = tau2/(tau1*tau1);
|
|
|
|
C = (1.-rateFluct)*MeanLoss/(lnw3-ipotLogFluct-beta2);
|
|
|
|
a1 = C*f1Fluct*(lnw3-e1LogFluct-beta2)/e1Fluct;
|
|
a2 = C*f2Fluct*(lnw3-e2LogFluct-beta2)/e2Fluct;
|
|
if (Tm > 0.) a3 = rateFluct*MeanLoss*Tm/(ipotFluct*w1*log(w2));
|
|
else { a1 /= rateFluct; a2 /= rateFluct; a3 = 0.;}
|
|
suma = a1+a2+a3;
|
|
|
|
//no fluctuation if the loss is too big
|
|
if (suma > MaxExcitationNumber) return MeanLoss;
|
|
|
|
suma<50.? prob = exp(-suma) : prob = 0.;
|
|
|
|
if (prob > probLimFluct) // very small Step
|
|
{
|
|
e0 = aMaterial->GetIonisation()->GetEnergy0fluct();
|
|
if (Tm <= 0.)
|
|
{
|
|
a1 = MeanLoss/e0;
|
|
if(a1>alim)
|
|
{
|
|
siga=sqrt(a1) ;
|
|
p1 = max(0,int(RandGauss::shoot(a1,siga)+0.5));
|
|
}
|
|
else
|
|
p1 = G4Poisson(a1);
|
|
loss = p1*e0 ;
|
|
}
|
|
else
|
|
{
|
|
Em = Tm+e0;
|
|
a1 = MeanLoss*(Em-e0)/(Em*e0*log(Em/e0));
|
|
if(a1>alim)
|
|
{
|
|
siga=sqrt(a1) ;
|
|
p1 = max(0,int(RandGauss::shoot(a1,siga)+0.5));
|
|
}
|
|
else
|
|
p1 = G4Poisson(a1);
|
|
w = (Em-e0)/Em;
|
|
// just to save time
|
|
if (p1 > nmaxDirectFluct)
|
|
{
|
|
dp1 = p1;
|
|
dnmaxDirectFluct=nmaxDirectFluct;
|
|
Corrfac = dp1/dnmaxDirectFluct;
|
|
p1 = nmaxDirectFluct;
|
|
}
|
|
else Corrfac = 1.;
|
|
|
|
loss = 0.;
|
|
for (long i=0; i<p1; i++) loss += 1./(1.-w*G4UniformRand());
|
|
loss *= (e0*Corrfac);
|
|
|
|
}
|
|
}
|
|
|
|
else // not so small Step
|
|
{
|
|
if(a1>alim)
|
|
{
|
|
siga=sqrt(a1) ;
|
|
p1 = max(0,int(RandGauss::shoot(a1,siga)+0.5));
|
|
}
|
|
else
|
|
p1 = G4Poisson(a1);
|
|
if(a2>alim)
|
|
{
|
|
siga=sqrt(a2) ;
|
|
p2 = max(0,int(RandGauss::shoot(a2,siga)+0.5));
|
|
}
|
|
else
|
|
p2 = G4Poisson(a2);
|
|
loss = p1*e1Fluct+p2*e2Fluct;
|
|
if (loss>0.) loss += (1.-2.*G4UniformRand())*e1Fluct;
|
|
if(a3>alim)
|
|
{
|
|
siga=sqrt(a3) ;
|
|
p3 = max(0,int(RandGauss::shoot(a3,siga)+0.5));
|
|
}
|
|
else
|
|
p3 = G4Poisson(a3);
|
|
|
|
lossc = 0.; na = 0.; alfa = 1.;
|
|
if (p3 > nmaxCont2)
|
|
{
|
|
dp3 = p3;
|
|
dnmaxCont2 = nmaxCont2;
|
|
rfac = dp3/(dnmaxCont2+dp3);
|
|
namean = p3*rfac;
|
|
sa = nmaxCont1*rfac;
|
|
na = RandGauss::shoot(namean,sa);
|
|
if (na > 0.)
|
|
{
|
|
alfa = w2*(nmaxCont2+p3)/(w2*nmaxCont2+p3);
|
|
alfa1 = alfa*log(alfa)/(alfa-1.);
|
|
ea = na*ipotFluct*alfa1;
|
|
sea = ipotFluct*sqrt(na*(alfa-alfa1*alfa1));
|
|
lossc += RandGauss::shoot(ea,sea);
|
|
}
|
|
}
|
|
|
|
nb = G4int(p3-na);
|
|
if (nb > 0)
|
|
{
|
|
w2 = alfa*ipotFluct;
|
|
w = (w1-w2)/w1;
|
|
for (G4int k=0; k<nb; k++) lossc += w2/(1.-w*G4UniformRand());
|
|
}
|
|
|
|
loss += lossc;
|
|
}
|
|
|
|
return loss ;
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
|
|
|