Gabriele Cosmo
1339 lines
38 KiB
C++
1339 lines
38 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: G4MuEnergyLoss.cc,v 1.8.6.1 1999/12/07 20:50:45 gunter Exp $
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// GEANT4 tag $Name: geant4-01-01 $
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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, CN Division, ASD group
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// History: first implementation, based on object model of
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// 2nd December 1995, G.Cosmo
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// ---------- G4MuEnergyLoss physics process -----------
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// by Laszlo Urban, September 1997
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// **************************************************************
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// It is the implementation of the NEW UNIFIED ENERGY LOSS PROCESS.
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// It calculates the energy loss of muons.
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// **************************************************************
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//
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// corrections by L.Urban on 27/05/98 (other corrs come soon!)
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// cleanup L.Urban on 23/10/98
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// --------------------------------------------------------------
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#include "G4MuEnergyLoss.hh"
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#include "G4EnergyLossTables.hh"
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#include "G4Poisson.hh"
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// Initialisation of static members *******************************************
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// contributing processes : ion.loss,bremsstrahlung,pair production
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// ->NbOfProcesses is initialized to 3.
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// YOU DO NOT HAVE TO CHANGE this variable for a 'normal' run.
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// You have to change NbOfProcesses
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// if you invent a new process contributing to the cont. energy loss,
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// NbOfProcesses should be 4 in this case,
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// or for debugging purposes.
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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 G4MuEnergyLoss.hh)
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G4int G4MuEnergyLoss::NbOfProcesses = 3 ; // !!!!!!!!!!!!!!!
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G4PhysicsTable** G4MuEnergyLoss::RecorderOfmuplusProcess =
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new G4PhysicsTable*[10] ;
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G4PhysicsTable** G4MuEnergyLoss::RecorderOfmuminusProcess =
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new G4PhysicsTable*[10] ;
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G4int G4MuEnergyLoss::CounterOfmuplusProcess = 0 ;
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G4int G4MuEnergyLoss::CounterOfmuminusProcess = 0 ;
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G4bool G4MuEnergyLoss::rndmStepFlag = false;
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G4bool G4MuEnergyLoss::EnlossFlucFlag = true;
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G4double G4MuEnergyLoss::dRoverRange = 20*perCent;
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G4double G4MuEnergyLoss::finalRange = 200*micrometer;
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G4PhysicsTable* G4MuEnergyLoss::theDEDXmuplusTable = NULL ;
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G4PhysicsTable* G4MuEnergyLoss::theRangemuplusTable = NULL ;
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G4PhysicsTable* G4MuEnergyLoss::theInverseRangemuplusTable = NULL ;
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G4PhysicsTable* G4MuEnergyLoss::theLabTimemuplusTable = NULL ;
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G4PhysicsTable* G4MuEnergyLoss::theProperTimemuplusTable = NULL ;
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G4PhysicsTable* G4MuEnergyLoss::theDEDXmuminusTable = NULL ;
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G4PhysicsTable* G4MuEnergyLoss::theRangemuminusTable = NULL ;
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G4PhysicsTable* G4MuEnergyLoss::theInverseRangemuminusTable = NULL ;
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G4PhysicsTable* G4MuEnergyLoss::theLabTimemuminusTable = NULL ;
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G4PhysicsTable* G4MuEnergyLoss::theProperTimemuminusTable = NULL ;
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G4PhysicsTable* G4MuEnergyLoss::themuplusRangeCoeffATable = NULL ;
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G4PhysicsTable* G4MuEnergyLoss::themuplusRangeCoeffBTable = NULL ;
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G4PhysicsTable* G4MuEnergyLoss::themuplusRangeCoeffCTable = NULL ;
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G4PhysicsTable* G4MuEnergyLoss::themuminusRangeCoeffATable = NULL ;
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G4PhysicsTable* G4MuEnergyLoss::themuminusRangeCoeffBTable = NULL ;
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G4PhysicsTable* G4MuEnergyLoss::themuminusRangeCoeffCTable = NULL ;
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G4EnergyLossMessenger* G4MuEnergyLoss::eLossMessenger = NULL ;
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// constructor and destructor
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G4MuEnergyLoss::G4MuEnergyLoss(const G4String& processName)
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: G4VContinuousDiscreteProcess (processName),
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LowestKineticEnergy(1.00*keV),
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HighestKineticEnergy(1000000.*TeV),
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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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theLossTable(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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lastgammaCutInRange(0.),
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lastelectronCutInRange(0.),
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theElectron ( G4Electron::Electron() ),
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thePositron ( G4Positron::Positron() ),
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theMuonPlus ( G4MuonPlus::MuonPlus() ),
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theMuonMinus ( G4MuonMinus::MuonMinus() )
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{ }
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G4MuEnergyLoss::~G4MuEnergyLoss()
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{
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if(theLossTable) {
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theLossTable->clearAndDestroy();
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delete theLossTable;
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}
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}
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void G4MuEnergyLoss::BuildDEDXTable(
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const G4ParticleDefinition& aParticleType)
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{
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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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G4bool MakeTable ;
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ParticleMass = aParticleType.GetPDGMass() ;
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G4double Charge = aParticleType.GetPDGCharge() ;
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G4double gammaCutInRange = G4Gamma::Gamma()->GetCuts();
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G4double electronCutInRange = G4Electron::Electron()->GetCuts();
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MakeTable = false ;
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// Create tables only if there are new cut values
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if((gammaCutInRange == lastgammaCutInRange) &&
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(electronCutInRange == lastelectronCutInRange))
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{
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;
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}
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else
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{
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if((Charge > 0.)&&(CounterOfmuplusProcess==NbOfProcesses))
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MakeTable = true ;
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if((Charge < 0.)&&(CounterOfmuminusProcess==NbOfProcesses))
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MakeTable = true ;
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}
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if( MakeTable )
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{
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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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const G4MaterialTable* theMaterialTable=
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G4Material::GetMaterialTable();
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G4int numOfMaterials = theMaterialTable->length();
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if( Charge >0.)
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{
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RecorderOfProcess=RecorderOfmuplusProcess;
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CounterOfProcess=CounterOfmuplusProcess;
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if(CounterOfProcess == NbOfProcesses)
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{
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if(theDEDXmuplusTable)
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{ theDEDXmuplusTable->clearAndDestroy();
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delete theDEDXmuplusTable; }
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theDEDXmuplusTable = new G4PhysicsTable(numOfMaterials);
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theDEDXTable = theDEDXmuplusTable;
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}
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}
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else
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{
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RecorderOfProcess=RecorderOfmuminusProcess;
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CounterOfProcess=CounterOfmuminusProcess;
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if(CounterOfProcess == NbOfProcesses)
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{
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if(theDEDXmuminusTable)
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{ theDEDXmuminusTable->clearAndDestroy();
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delete theDEDXmuminusTable; }
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theDEDXmuminusTable = new G4PhysicsTable(numOfMaterials);
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theDEDXTable = theDEDXmuminusTable;
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}
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}
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if(CounterOfProcess == NbOfProcesses)
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{
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// loop for materials
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G4double LowEdgeEnergy , Value ;
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G4bool isOutRange ;
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G4int J;
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G4PhysicsTable* pointer ;
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for (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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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]->
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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( Charge >0.)
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CounterOfmuplusProcess=0 ;
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else
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CounterOfmuminusProcess=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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}
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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(1000000.*TeV);
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G4EnergyLossTables::Register(&aParticleType,
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(Charge > 0)? theDEDXmuplusTable: theDEDXmuminusTable,
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(Charge > 0)? theRangemuplusTable: theRangemuminusTable,
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(Charge > 0)? theInverseRangemuplusTable: theInverseRangemuminusTable,
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(Charge > 0)? theLabTimemuplusTable: theLabTimemuminusTable,
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(Charge > 0)? theProperTimemuplusTable: theProperTimemuminusTable,
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lowestKineticEnergy, highestKineticEnergy, 1.,TotBin);
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lastgammaCutInRange = gammaCutInRange ;
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lastelectronCutInRange = electronCutInRange ;
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}
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}
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void G4MuEnergyLoss::BuildRangeTable(
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const G4ParticleDefinition& aParticleType)
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// Build range table from the energy loss table
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{
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G4double Charge = aParticleType.GetPDGCharge() ;
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const G4MaterialTable* theMaterialTable=
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G4Material::GetMaterialTable();
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G4int numOfMaterials = theMaterialTable->length();
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if( Charge >0.)
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{
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if(theRangemuplusTable)
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{ theRangemuplusTable->clearAndDestroy();
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delete theRangemuplusTable; }
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theRangemuplusTable = new G4PhysicsTable(numOfMaterials);
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theRangeTable = theRangemuplusTable ;
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}
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else
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{
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if(theRangemuminusTable)
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{ theRangemuminusTable->clearAndDestroy();
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delete theRangemuminusTable; }
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theRangemuminusTable = new G4PhysicsTable(numOfMaterials);
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theRangeTable = theRangemuminusTable ;
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}
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for (G4int J=0; J<numOfMaterials; J++)
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{
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G4PhysicsLogVector* aVector;
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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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void G4MuEnergyLoss::BuildTimeTables(
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const G4ParticleDefinition& aParticleType)
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// Build time tables from the energy loss table
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{
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const G4MaterialTable* theMaterialTable=
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G4Material::GetMaterialTable();
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G4int numOfMaterials = theMaterialTable->length();
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if(&aParticleType == theMuonPlus)
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{
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if(theLabTimemuplusTable)
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{ theLabTimemuplusTable->clearAndDestroy();
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delete theLabTimemuplusTable; }
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theLabTimemuplusTable = new G4PhysicsTable(numOfMaterials);
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theLabTimeTable = theLabTimemuplusTable ;
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if(theProperTimemuplusTable)
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{ theProperTimemuplusTable->clearAndDestroy();
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delete theProperTimemuplusTable; }
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theProperTimemuplusTable = new G4PhysicsTable(numOfMaterials);
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theProperTimeTable = theProperTimemuplusTable ;
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}
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if(&aParticleType == theMuonMinus)
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{
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if(theLabTimemuminusTable)
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{ theLabTimemuminusTable->clearAndDestroy();
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delete theLabTimemuminusTable; }
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theLabTimemuminusTable = new G4PhysicsTable(numOfMaterials);
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theLabTimeTable = theLabTimemuminusTable ;
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if(theProperTimemuminusTable)
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{ theProperTimemuminusTable->clearAndDestroy();
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delete theProperTimemuminusTable; }
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theProperTimemuminusTable = new G4PhysicsTable(numOfMaterials);
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theProperTimeTable = theProperTimemuminusTable ;
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}
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for (G4int J=0; J<numOfMaterials; J++)
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{
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G4PhysicsLogVector* aVector;
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G4PhysicsLogVector* bVector;
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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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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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void G4MuEnergyLoss::BuildRangeVector(G4int materialIndex,
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G4PhysicsLogVector* rangeVector)
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{
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static G4int nbin;
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const G4double BigRange = DBL_MAX ;
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G4int maxbint=100;
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G4bool isOut;
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G4double tlim=2.*MeV,t1=0.1*MeV,t2=0.025*MeV ;
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G4double loss1,loss2,ca,cb,cba ;
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G4double taulim,rangelim,ltaulim,ltaumax,
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LowEdgeEnergy,tau,Value,tau1,sqtau1 ;
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G4PhysicsVector* physicsVector= (*theDEDXTable)[materialIndex];
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const G4MaterialTable* theMaterialTable =
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G4Material::GetMaterialTable() ;
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// low energy part first...
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loss1 = physicsVector->GetValue(t1,isOut);
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loss2 = physicsVector->GetValue(t2,isOut);
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tau1 = t1/ParticleMass ;
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sqtau1 = sqrt(tau1) ;
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ca = (4.*loss2-loss1)/sqtau1 ;
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cb = (2.*loss1-4.*loss2)/tau1 ;
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cba = cb/ca ;
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taulim = tlim/ParticleMass ;
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ltaulim = log(taulim) ;
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ltaumax = log(HighestKineticEnergy/ParticleMass) ;
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G4int i=-1;
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G4double oldValue = 0. ;
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G4double 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/ParticleMass;
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if ( tau <= tau1 )
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{
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Value = 2.*ParticleMass*log(1.+cba*sqrt(tau))/cb ;
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}
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else
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{
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Value = 2.*ParticleMass*log(1.+cba*sqtau1)/cb ;
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if(tau<=taulim)
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{
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nbin = maxbint ;
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taulow = tau1 ;
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tauhigh = tau ;
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Value += RangeIntLin(physicsVector,nbin);
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}
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else
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{
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taulow = tau1 ;
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tauhigh = taulim ;
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Value += RangeIntLin(physicsVector,maxbint) ;
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ltaulow = ltaulim ;
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ltauhigh = log(tau) ;
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nbin = maxbint ;
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Value += RangeIntLog(physicsVector,nbin);
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}
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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/ParticleMass;
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ltaulow = log(tauold);
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ltauhigh = log(tau);
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nbin = maxbint;
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Value = oldValue+RangeIntLog(physicsVector,nbin);
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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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void G4MuEnergyLoss::BuildLabTimeVector(G4int materialIndex,
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G4PhysicsLogVector* timeVector)
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{
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static G4int nbin;
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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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G4double losslim,clim,taulim,timelim,ltaulim,ltaumax,
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LowEdgeEnergy,tau,Value ;
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G4PhysicsVector* physicsVector= (*theDEDXTable)[materialIndex];
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const G4MaterialTable* theMaterialTable =
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G4Material::GetMaterialTable() ;
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losslim = physicsVector->GetValue(tlim,isOut);
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taulim=tlim/ParticleMass ;
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clim=sqrt(ParticleMass*tlim/2.)/(c_light*losslim*ppar) ;
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ltaulim = log(taulim);
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ltaumax = log(HighestKineticEnergy/ParticleMass) ;
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G4int i=-1;
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G4double oldValue = 0. ;
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G4double tauold ;
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do
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{
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i += 1 ;
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LowEdgeEnergy = timeVector->GetLowEdgeEnergy(i);
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tau = LowEdgeEnergy/ParticleMass ;
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if ( tau <= taulim )
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{
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Value = clim*exp(ppar*log(tau/taulim)) ;
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}
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else
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{
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timelim=clim ;
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ltaulow = log(taulim);
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ltauhigh = log(tau);
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nbin = maxbint;
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Value = timelim+LabTimeIntLog(physicsVector,nbin);
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}
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timeVector->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 = timeVector->GetLowEdgeEnergy(j);
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tau = LowEdgeEnergy/ParticleMass ;
|
|
ltaulow = log(tauold);
|
|
ltauhigh = log(tau);
|
|
nbin = maxbint ;
|
|
Value = oldValue+LabTimeIntLog(physicsVector,nbin);
|
|
|
|
timeVector->PutValue(j,Value);
|
|
oldValue = Value ;
|
|
tauold = tau ;
|
|
}
|
|
}
|
|
|
|
void G4MuEnergyLoss::BuildProperTimeVector(G4int materialIndex,
|
|
G4PhysicsLogVector* timeVector)
|
|
{
|
|
static G4int nbin;
|
|
G4int maxbint=100;
|
|
G4bool isOut;
|
|
G4double tlim=5.*keV,parlowen=0.4,ppar=0.5-parlowen ;
|
|
G4double losslim,clim,taulim,timelim,ltaulim,ltaumax,
|
|
LowEdgeEnergy,tau,Value ;
|
|
|
|
G4PhysicsVector* physicsVector= (*theDEDXTable)[materialIndex];
|
|
|
|
const G4MaterialTable* theMaterialTable =
|
|
G4Material::GetMaterialTable() ;
|
|
|
|
losslim = physicsVector->GetValue(tlim,isOut);
|
|
taulim=tlim/ParticleMass ;
|
|
clim=sqrt(ParticleMass*tlim/2.)/(c_light*losslim*ppar) ;
|
|
ltaulim = log(taulim);
|
|
ltaumax = log(HighestKineticEnergy/ParticleMass) ;
|
|
|
|
G4int i=-1;
|
|
G4double oldValue = 0. ;
|
|
G4double 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);
|
|
nbin = maxbint;
|
|
Value = timelim+ProperTimeIntLog(physicsVector,nbin);
|
|
}
|
|
|
|
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);
|
|
nbin = maxbint ;
|
|
Value = oldValue+ProperTimeIntLog(physicsVector,nbin);
|
|
|
|
timeVector->PutValue(j,Value);
|
|
oldValue = Value ;
|
|
tauold = tau ;
|
|
}
|
|
}
|
|
|
|
|
|
G4double G4MuEnergyLoss::RangeIntLin(G4PhysicsVector* physicsVector,
|
|
G4int nbin)
|
|
// num. integration, linear binning
|
|
{
|
|
G4double dtau,Value,taui,ti,lossi,ci;
|
|
G4bool isOut;
|
|
|
|
dtau = (tauhigh-taulow)/nbin;
|
|
Value = 0.;
|
|
for (G4int i=0; i<=nbin; i++)
|
|
{
|
|
taui = taulow + dtau*i ;
|
|
ti = ParticleMass*taui;
|
|
lossi = physicsVector->GetValue(ti,isOut);
|
|
if(i==0)
|
|
ci=0.5;
|
|
else
|
|
{
|
|
if(i<nbin)
|
|
ci=1.;
|
|
else
|
|
ci=0.5;
|
|
}
|
|
Value += ci/lossi;
|
|
}
|
|
Value *= ParticleMass*dtau;
|
|
return Value;
|
|
}
|
|
|
|
|
|
G4double G4MuEnergyLoss::RangeIntLog(G4PhysicsVector* physicsVector,
|
|
G4int nbin)
|
|
// num. integration, logarithmic binning
|
|
{
|
|
G4double ltt,dltau,Value,ui,taui,ti,lossi,ci;
|
|
G4bool isOut;
|
|
|
|
ltt = ltauhigh-ltaulow;
|
|
dltau = ltt/nbin;
|
|
Value = 0.;
|
|
|
|
for (G4int i=0; i<=nbin; i++)
|
|
{
|
|
ui = ltaulow+dltau*i;
|
|
taui = exp(ui);
|
|
ti = ParticleMass*taui;
|
|
lossi = physicsVector->GetValue(ti,isOut);
|
|
if(i==0)
|
|
ci=0.5;
|
|
else
|
|
{
|
|
if(i<nbin)
|
|
ci=1.;
|
|
else
|
|
ci=0.5;
|
|
}
|
|
Value += ci*taui/lossi;
|
|
}
|
|
Value *= ParticleMass*dltau;
|
|
return Value;
|
|
}
|
|
|
|
G4double G4MuEnergyLoss::LabTimeIntLog(G4PhysicsVector* physicsVector,
|
|
G4int nbin)
|
|
// num. integration, logarithmic binning
|
|
{
|
|
G4double ltt,dltau,Value,ui,taui,ti,lossi,ci;
|
|
G4bool isOut;
|
|
|
|
ltt = ltauhigh-ltaulow;
|
|
dltau = ltt/nbin;
|
|
Value = 0.;
|
|
|
|
for (G4int i=0; i<=nbin; i++)
|
|
{
|
|
ui = ltaulow+dltau*i;
|
|
taui = exp(ui);
|
|
ti = ParticleMass*taui;
|
|
lossi = physicsVector->GetValue(ti,isOut);
|
|
if(i==0)
|
|
ci=0.5;
|
|
else
|
|
{
|
|
if(i<nbin)
|
|
ci=1.;
|
|
else
|
|
ci=0.5;
|
|
}
|
|
Value += ci*taui*(ti+ParticleMass)/(sqrt(ti*(ti+2.*ParticleMass))*lossi);
|
|
}
|
|
Value *= ParticleMass*dltau/c_light;
|
|
return Value;
|
|
}
|
|
|
|
G4double G4MuEnergyLoss::ProperTimeIntLog(G4PhysicsVector* physicsVector,
|
|
G4int nbin)
|
|
// num. integration, logarithmic binning
|
|
{
|
|
G4double ltt,dltau,Value,ui,taui,ti,lossi,ci;
|
|
G4bool isOut;
|
|
|
|
ltt = ltauhigh-ltaulow;
|
|
dltau = ltt/nbin;
|
|
Value = 0.;
|
|
|
|
for (G4int i=0; i<=nbin; i++)
|
|
{
|
|
ui = ltaulow+dltau*i;
|
|
taui = exp(ui);
|
|
ti = ParticleMass*taui;
|
|
lossi = physicsVector->GetValue(ti,isOut);
|
|
if(i==0)
|
|
ci=0.5;
|
|
else
|
|
{
|
|
if(i<nbin)
|
|
ci=1.;
|
|
else
|
|
ci=0.5;
|
|
}
|
|
Value += ci*taui*ParticleMass/(sqrt(ti*(ti+2.*ParticleMass))*lossi);
|
|
}
|
|
Value *= ParticleMass*dltau/c_light;
|
|
return Value;
|
|
}
|
|
|
|
void G4MuEnergyLoss::BuildRangeCoeffATable(
|
|
const G4ParticleDefinition& aParticleType)
|
|
// Build tables of coefficients for the energy loss calculation
|
|
{
|
|
G4double Charge = aParticleType.GetPDGCharge() ;
|
|
|
|
const G4MaterialTable* theMaterialTable=
|
|
G4Material::GetMaterialTable();
|
|
|
|
// create table for coefficients "A"
|
|
|
|
G4int numOfMaterials = theMaterialTable->length();
|
|
|
|
if(Charge>0.)
|
|
{
|
|
if(themuplusRangeCoeffATable)
|
|
{ themuplusRangeCoeffATable->clearAndDestroy();
|
|
delete themuplusRangeCoeffATable; }
|
|
themuplusRangeCoeffATable = new G4PhysicsTable(numOfMaterials);
|
|
theRangeCoeffATable = themuplusRangeCoeffATable ;
|
|
theRangeTable = theRangemuplusTable ;
|
|
}
|
|
else
|
|
{
|
|
if(themuminusRangeCoeffATable)
|
|
{ themuminusRangeCoeffATable->clearAndDestroy();
|
|
delete themuminusRangeCoeffATable; }
|
|
themuminusRangeCoeffATable = new G4PhysicsTable(numOfMaterials);
|
|
theRangeCoeffATable = themuminusRangeCoeffATable ;
|
|
theRangeTable = theRangemuminusTable ;
|
|
}
|
|
|
|
G4double R2 = RTable*RTable ;
|
|
G4double R1 = RTable+1.;
|
|
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++)
|
|
{
|
|
|
|
// create vector
|
|
G4int binmax=TotBin ;
|
|
G4PhysicsLinearVector* aVector=new G4PhysicsLinearVector(0.,binmax, TotBin);
|
|
|
|
// loop for kinetic energy
|
|
Ti = LowestKineticEnergy ;
|
|
|
|
G4PhysicsVector* rangeVector= (*theRangeTable)[J];
|
|
|
|
for ( G4int i=0; i<TotBin; i++)
|
|
{
|
|
Ri = rangeVector->GetValue(Ti,isOut) ;
|
|
if ( i==0 )
|
|
Rim = 0. ;
|
|
else
|
|
{
|
|
Tim = Ti/RTable ;
|
|
Rim = rangeVector->GetValue(Tim,isOut);
|
|
}
|
|
if ( i==(TotBin-1))
|
|
Rip = Ri ;
|
|
else
|
|
{
|
|
Tip = Ti*RTable ;
|
|
Rip = rangeVector->GetValue(Tip,isOut);
|
|
}
|
|
Value = (w1*Rip + w2*Ri + w3*Rim)/(Ti*Ti) ;
|
|
aVector->PutValue(i,Value);
|
|
Ti = RTable*Ti ;
|
|
}
|
|
theRangeCoeffATable->insert(aVector);
|
|
}
|
|
}
|
|
|
|
|
|
void G4MuEnergyLoss::BuildRangeCoeffBTable(
|
|
const G4ParticleDefinition& aParticleType)
|
|
// Build tables of coefficients for the energy loss calculation
|
|
{
|
|
G4double Charge = aParticleType.GetPDGCharge() ;
|
|
|
|
const G4MaterialTable* theMaterialTable=
|
|
G4Material::GetMaterialTable();
|
|
|
|
// create table for coefficients "B"
|
|
G4int numOfMaterials = theMaterialTable->length();
|
|
|
|
if(Charge>0.)
|
|
{
|
|
if(themuplusRangeCoeffBTable)
|
|
{ themuplusRangeCoeffBTable->clearAndDestroy();
|
|
delete themuplusRangeCoeffBTable; }
|
|
themuplusRangeCoeffBTable = new G4PhysicsTable(numOfMaterials);
|
|
theRangeCoeffBTable = themuplusRangeCoeffBTable ;
|
|
theRangeTable = theRangemuplusTable ;
|
|
}
|
|
else
|
|
{
|
|
if(themuminusRangeCoeffBTable)
|
|
{ themuminusRangeCoeffBTable->clearAndDestroy();
|
|
delete themuminusRangeCoeffBTable; }
|
|
themuminusRangeCoeffBTable = new G4PhysicsTable(numOfMaterials);
|
|
theRangeCoeffBTable = themuminusRangeCoeffBTable ;
|
|
theRangeTable = theRangemuminusTable ;
|
|
}
|
|
|
|
G4double R2 = RTable*RTable ;
|
|
G4double R1 = RTable+1.;
|
|
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++)
|
|
{
|
|
G4int binmax=TotBin ;
|
|
|
|
G4PhysicsLinearVector* aVector=new G4PhysicsLinearVector(0.,binmax, TotBin);
|
|
|
|
// loop for kinetic energy
|
|
Ti = LowestKineticEnergy ;
|
|
G4PhysicsVector* rangeVector= (*theRangeTable)[J];
|
|
|
|
for ( G4int i=0; i<TotBin; i++)
|
|
{
|
|
Ri = rangeVector->GetValue(Ti,isOut) ;
|
|
if ( i==0 )
|
|
Rim = 0. ;
|
|
else
|
|
{
|
|
Tim = Ti/RTable ;
|
|
Rim = rangeVector->GetValue(Tim,isOut);
|
|
}
|
|
if ( i==(TotBin-1))
|
|
Rip = Ri ;
|
|
else
|
|
{
|
|
Tip = Ti*RTable ;
|
|
Rip = rangeVector->GetValue(Tip,isOut);
|
|
}
|
|
Value = (w1*Rip + w2*Ri + w3*Rim)/Ti;
|
|
aVector->PutValue(i,Value);
|
|
Ti = RTable*Ti ;
|
|
}
|
|
theRangeCoeffBTable->insert(aVector);
|
|
}
|
|
}
|
|
void G4MuEnergyLoss::BuildRangeCoeffCTable(
|
|
const G4ParticleDefinition& aParticleType)
|
|
// Build tables of coefficients for the energy loss calculation
|
|
{
|
|
G4double Charge = aParticleType.GetPDGCharge() ;
|
|
const G4MaterialTable* theMaterialTable=
|
|
G4Material::GetMaterialTable();
|
|
|
|
// create table for coefficients "C"
|
|
G4int numOfMaterials = theMaterialTable->length();
|
|
|
|
if(Charge>0.)
|
|
{
|
|
if(themuplusRangeCoeffCTable)
|
|
{ themuplusRangeCoeffCTable->clearAndDestroy();
|
|
delete themuplusRangeCoeffCTable; }
|
|
themuplusRangeCoeffCTable = new G4PhysicsTable(numOfMaterials);
|
|
theRangeCoeffCTable = themuplusRangeCoeffCTable ;
|
|
theRangeTable = theRangemuplusTable ;
|
|
}
|
|
else
|
|
{
|
|
if(themuminusRangeCoeffCTable)
|
|
{ themuminusRangeCoeffCTable->clearAndDestroy();
|
|
delete themuminusRangeCoeffCTable; }
|
|
themuminusRangeCoeffCTable = new G4PhysicsTable(numOfMaterials);
|
|
theRangeCoeffCTable = themuminusRangeCoeffCTable ;
|
|
theRangeTable = theRangemuminusTable ;
|
|
}
|
|
|
|
const G4double BigRange = DBL_MAX ;
|
|
G4double R2 = RTable*RTable ;
|
|
G4double R1 = RTable+1.;
|
|
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++)
|
|
{
|
|
|
|
// create vector
|
|
G4int binmax=TotBin ;
|
|
G4PhysicsLinearVector* aVector=new G4PhysicsLinearVector(0.,binmax, TotBin);
|
|
|
|
// loop for kinetic energy
|
|
Ti = LowestKineticEnergy ;
|
|
G4PhysicsVector* rangeVector= (*theRangeTable)[J];
|
|
|
|
for ( G4int i=0; i<TotBin; i++)
|
|
{
|
|
Ri = rangeVector->GetValue(Ti,isOut) ;
|
|
if ( i==0 )
|
|
Rim = 0. ;
|
|
else
|
|
{
|
|
Tim = Ti/RTable ;
|
|
Rim = rangeVector->GetValue(Tim,isOut);
|
|
}
|
|
if ( i==(TotBin-1))
|
|
Rip = Ri ;
|
|
else
|
|
{
|
|
Tip = Ti*RTable ;
|
|
Rip = rangeVector->GetValue(Tip,isOut);
|
|
}
|
|
Value = w1*Rip + w2*Ri + w3*Rim ;
|
|
aVector->PutValue(i,Value);
|
|
Ti = RTable*Ti ;
|
|
}
|
|
theRangeCoeffCTable->insert(aVector);
|
|
}
|
|
}
|
|
|
|
void G4MuEnergyLoss::BuildInverseRangeTable(
|
|
const G4ParticleDefinition& aParticleType)
|
|
// Build inverse table of the range table
|
|
{
|
|
G4double SmallestRange,BiggestRange ;
|
|
G4bool isOut ;
|
|
|
|
const G4MaterialTable* theMaterialTable=
|
|
G4Material::GetMaterialTable();
|
|
|
|
G4int numOfMaterials = theMaterialTable->length();
|
|
|
|
if(&aParticleType == theMuonPlus)
|
|
{
|
|
if(theInverseRangemuplusTable)
|
|
{ theInverseRangemuplusTable->clearAndDestroy();
|
|
delete theInverseRangemuplusTable; }
|
|
theInverseRangemuplusTable = new G4PhysicsTable(numOfMaterials);
|
|
theInverseRangeTable = theInverseRangemuplusTable ;
|
|
theRangeTable = theRangemuplusTable ;
|
|
theDEDXTable = theDEDXmuplusTable ;
|
|
theRangeCoeffATable = themuplusRangeCoeffATable ;
|
|
theRangeCoeffBTable = themuplusRangeCoeffBTable ;
|
|
theRangeCoeffCTable = themuplusRangeCoeffCTable ;
|
|
}
|
|
|
|
if(&aParticleType == theMuonMinus)
|
|
{
|
|
if(theInverseRangemuminusTable)
|
|
{ theInverseRangemuminusTable->clearAndDestroy();
|
|
delete theInverseRangemuminusTable; }
|
|
theInverseRangemuminusTable = new G4PhysicsTable(numOfMaterials);
|
|
theInverseRangeTable = theInverseRangemuminusTable ;
|
|
theRangeTable = theRangemuminusTable ;
|
|
theDEDXTable = theDEDXmuminusTable ;
|
|
theRangeCoeffATable = themuminusRangeCoeffATable ;
|
|
theRangeCoeffBTable = themuminusRangeCoeffBTable ;
|
|
theRangeCoeffCTable = themuminusRangeCoeffCTable ;
|
|
}
|
|
// loop for materials
|
|
|
|
for (G4int J=0; J<numOfMaterials; J++)
|
|
{
|
|
SmallestRange = (*theRangeTable)(J)->
|
|
GetValue(LowestKineticEnergy,isOut) ;
|
|
BiggestRange = (*theRangeTable)(J)->
|
|
GetValue(HighestKineticEnergy,isOut) ;
|
|
// create vector
|
|
G4PhysicsLogVector* aVector;
|
|
|
|
aVector = new G4PhysicsLogVector(SmallestRange,
|
|
BiggestRange,TotBin);
|
|
|
|
// fill the vector ( ranges for the actual material)
|
|
|
|
InvertRangeVector(J, aVector);
|
|
|
|
// insert vector to the table
|
|
|
|
theInverseRangeTable->insert(aVector);
|
|
|
|
}
|
|
}
|
|
|
|
void G4MuEnergyLoss::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) ; //i.e. GetLowEdgeValue(i)
|
|
|
|
if( rangebin < LowEdgeRange )
|
|
{
|
|
do
|
|
{
|
|
binnumber += 1 ;
|
|
Tbin *= RTable ;
|
|
rangebin = (*theRangeTable)(materialIndex)->GetValue(Tbin,isOut) ;
|
|
}
|
|
while ((rangebin < LowEdgeRange) && (binnumber < TotBin )) ;
|
|
}
|
|
|
|
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) ;
|
|
|
|
}
|
|
}
|
|
|
|
G4double G4MuEnergyLoss::GetConstraints(const G4DynamicParticle *aParticle,
|
|
G4Material *aMaterial)
|
|
{
|
|
|
|
// returns the Step limit
|
|
// dRoverRange is the max. allowed relative range loss in one Step
|
|
// it calculates dEdx and the range as well....
|
|
|
|
G4double KineticEnergy,StepLimit;
|
|
G4bool isOutRange ;
|
|
G4int index,bin ;
|
|
|
|
if(aParticle->GetDefinition()->GetPDGCharge()>0.)
|
|
{
|
|
theDEDXTable = theDEDXmuplusTable ;
|
|
theRangeTable = theRangemuplusTable ;
|
|
theRangeCoeffATable=themuplusRangeCoeffATable ;
|
|
theRangeCoeffBTable=themuplusRangeCoeffBTable ;
|
|
theRangeCoeffCTable=themuplusRangeCoeffCTable ;
|
|
}
|
|
else
|
|
{
|
|
theDEDXTable = theDEDXmuminusTable ;
|
|
theRangeTable = theRangemuminusTable ;
|
|
theRangeCoeffATable=themuminusRangeCoeffATable ;
|
|
theRangeCoeffBTable=themuminusRangeCoeffBTable ;
|
|
theRangeCoeffCTable=themuminusRangeCoeffCTable ;
|
|
}
|
|
|
|
|
|
G4double c1=dRoverRange, c2=2.*(1.-dRoverRange)*finalRange ,
|
|
c3=-(1.-dRoverRange)*finalRange*finalRange ;
|
|
|
|
G4double Thigh = HighestKineticEnergy/RTable ;
|
|
KineticEnergy = aParticle->GetKineticEnergy();
|
|
|
|
bin = G4int(log(KineticEnergy/LowestKineticEnergy)/LOGRTable) ;
|
|
EnergyBinNumber = bin ;
|
|
|
|
index = aMaterial->GetIndex() ;
|
|
|
|
if( KineticEnergy < LowestKineticEnergy )
|
|
{
|
|
fdEdx = sqrt(KineticEnergy/LowestKineticEnergy)*
|
|
(*theDEDXTable)(index)->GetValue(LowestKineticEnergy,isOutRange) ;
|
|
|
|
fRangeNow = sqrt(KineticEnergy/LowestKineticEnergy)*
|
|
(*theRangeTable)(index)->GetValue(LowestKineticEnergy,isOutRange) ;
|
|
|
|
StepLimit = fRangeNow ;
|
|
}
|
|
else if (KineticEnergy > Thigh )
|
|
{
|
|
fdEdx = (*theDEDXTable)(index)->GetValue(Thigh,isOutRange);
|
|
fRangeNow = (*theRangeTable)(index)->GetValue(Thigh,isOutRange);
|
|
if (fdEdx > 0.) fRangeNow += (KineticEnergy-Thigh)/fdEdx;
|
|
StepLimit = c1*fRangeNow;
|
|
}
|
|
else
|
|
{
|
|
fdEdx = (*theDEDXTable)(index)->
|
|
GetValue(KineticEnergy,isOutRange) ;
|
|
|
|
RangeCoeffA = (*(*theRangeCoeffATable)(index))(EnergyBinNumber) ;
|
|
RangeCoeffB = (*(*theRangeCoeffBTable)(index))(EnergyBinNumber) ;
|
|
RangeCoeffC = (*(*theRangeCoeffCTable)(index))(EnergyBinNumber) ;
|
|
|
|
fRangeNow = (RangeCoeffA*KineticEnergy+RangeCoeffB)
|
|
*KineticEnergy+RangeCoeffC ;
|
|
|
|
// compute the (random) Step limit ..............
|
|
if(fRangeNow>finalRange)
|
|
{
|
|
StepLimit = c1*fRangeNow+c2+c3/fRangeNow ;
|
|
|
|
// randomise this value
|
|
if(rndmStepFlag) StepLimit = finalRange+(StepLimit-finalRange)*
|
|
G4UniformRand() ;
|
|
if(StepLimit > fRangeNow) StepLimit = fRangeNow ;
|
|
}
|
|
else
|
|
StepLimit = fRangeNow ;
|
|
}
|
|
|
|
return StepLimit ;
|
|
|
|
}
|
|
|
|
G4VParticleChange* G4MuEnergyLoss::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() ;
|
|
G4double charge = aParticle->GetDefinition()->GetPDGCharge();
|
|
|
|
G4Material* aMaterial = trackData.GetMaterial();
|
|
G4int index = aMaterial->GetIndex();
|
|
|
|
G4double Step = stepData.GetStepLength();
|
|
|
|
aParticleChange.Initialize(trackData);
|
|
|
|
// do not track further if kin.energy < 1. eV
|
|
const G4double MinKineticEnergy = 1.*eV;
|
|
const G4double linLossLimit = 0.02 ;
|
|
|
|
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(
|
|
theMuonMinus,fRangeNow-Step,aMaterial);
|
|
else finalT = G4EnergyLossTables::GetPreciseEnergyFromRange(
|
|
theMuonPlus,fRangeNow-Step,aMaterial);
|
|
}
|
|
}
|
|
|
|
if(finalT < MinKineticEnergy) finalT = 0. ;
|
|
|
|
MeanLoss = E-finalT ;
|
|
|
|
//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.;
|
|
aParticleChange.SetStatusChange(fStopButAlive);
|
|
}
|
|
|
|
aParticleChange.SetNumberOfSecondaries(0);
|
|
aParticleChange.SetEnergyChange(finalT);
|
|
aParticleChange.SetLocalEnergyDeposit(E-finalT);
|
|
|
|
return &aParticleChange;
|
|
}
|
|
|
|
G4double G4MuEnergyLoss::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;
|
|
|
|
// get particle data
|
|
G4double Tkin = aParticle->GetKineticEnergy();
|
|
G4double charge = aParticle->GetDefinition()->GetPDGCharge();
|
|
threshold =((*G4Electron::Electron()).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;
|
|
p1 = G4Poisson(a1);
|
|
loss = p1*e0 ;
|
|
}
|
|
else
|
|
{
|
|
Em = Tm+e0;
|
|
a1 = MeanLoss*(Em-e0)/(Em*e0*log(Em/e0));
|
|
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
|
|
{
|
|
p1 = G4Poisson(a1);
|
|
p2 = G4Poisson(a2);
|
|
loss = p1*e1Fluct+p2*e2Fluct;
|
|
if (loss>0.) loss += (1.-2.*G4UniformRand())*e1Fluct;
|
|
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 ;
|
|
}
|
|
|
|
|