Gabriele Cosmo
1279 lines
42 KiB
C++
1279 lines
42 KiB
C++
//
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// ********************************************************************
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// * DISCLAIMER *
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// * *
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// * The following disclaimer summarizes all the specific disclaimers *
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// * of contributors to this software. The specific disclaimers,which *
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// * govern, are listed with their locations in: *
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// * http://cern.ch/geant4/license *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. *
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// * *
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// * This code implementation is the intellectual property of the *
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// * GEANT4 collaboration. *
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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 *
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// * statement, and all its terms. *
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// ********************************************************************
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//
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//
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// $Id: G4VIeEnergyLoss.cc,v 1.1.2.2 2001/06/28 20:19:21 gunter Exp $
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// GEANT4 tag $Name: $
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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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// History: based on object model of
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// 2nd December 1995, G.Cosmo
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// ---------- G4VIeEnergyLoss 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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//
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// 08-05-97: small changes by L.Urban
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// 27-05-98: several bugs and inconsistencies are corrected,
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// new table (the inverse of the range table) added ,
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// AlongStepDoit uses now this new table. L.Urban
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// 08-09-98: cleanup
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// 26-10-98: revision, TOF tables L.Urban
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// --------------------------------------------------------------
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#include "G4VIeEnergyLoss.hh"
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#include "G4EnergyLossTables.hh"
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#include "G4EnergyLossMessenger.hh"
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#include "G4Poisson.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 G4VIeEnergyLoss.hh)
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G4int G4VIeEnergyLoss::NbOfProcesses = 2;
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G4int G4VIeEnergyLoss::CounterOfElectronProcess = 0;
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G4int G4VIeEnergyLoss::CounterOfPositronProcess = 0;
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G4PhysicsTable** G4VIeEnergyLoss::RecorderOfElectronProcess =
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new G4PhysicsTable*[10];
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G4PhysicsTable** G4VIeEnergyLoss::RecorderOfPositronProcess =
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new G4PhysicsTable*[10];
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G4bool G4VIeEnergyLoss::rndmStepFlag = false;
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G4bool G4VIeEnergyLoss::EnlossFlucFlag = true;
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G4double G4VIeEnergyLoss::dRoverRange = 20*perCent;
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G4double G4VIeEnergyLoss::finalRange = 200*micrometer;
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G4PhysicsTable* G4VIeEnergyLoss::theDEDXElectronTable = NULL;
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G4PhysicsTable* G4VIeEnergyLoss::theDEDXPositronTable = NULL;
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G4PhysicsTable* G4VIeEnergyLoss::theRangeElectronTable = NULL;
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G4PhysicsTable* G4VIeEnergyLoss::theRangePositronTable = NULL;
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G4PhysicsTable* G4VIeEnergyLoss::theInverseRangeElectronTable = NULL;
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G4PhysicsTable* G4VIeEnergyLoss::theInverseRangePositronTable = NULL;
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G4PhysicsTable* G4VIeEnergyLoss::theLabTimeElectronTable = NULL;
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G4PhysicsTable* G4VIeEnergyLoss::theLabTimePositronTable = NULL;
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G4PhysicsTable* G4VIeEnergyLoss::theProperTimeElectronTable = NULL;
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G4PhysicsTable* G4VIeEnergyLoss::theProperTimePositronTable = NULL;
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G4PhysicsTable* G4VIeEnergyLoss::theeRangeCoeffATable = NULL;
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G4PhysicsTable* G4VIeEnergyLoss::theeRangeCoeffBTable = NULL;
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G4PhysicsTable* G4VIeEnergyLoss::theeRangeCoeffCTable = NULL;
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G4PhysicsTable* G4VIeEnergyLoss::thepRangeCoeffATable = NULL;
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G4PhysicsTable* G4VIeEnergyLoss::thepRangeCoeffBTable = NULL;
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G4PhysicsTable* G4VIeEnergyLoss::thepRangeCoeffCTable = NULL;
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G4EnergyLossMessenger* G4VIeEnergyLoss::eLossMessenger = NULL;
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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// constructor and destructor
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G4VIeEnergyLoss::G4VIeEnergyLoss(const G4String& processName)
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: G4IVContinuousDiscreteProcess (processName),
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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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LowestKineticEnergy(1.00*keV),
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HighestKineticEnergy(100.*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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{
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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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G4VIeEnergyLoss::~G4VIeEnergyLoss()
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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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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4VIeEnergyLoss::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 = 2.*dRoverRange; //binning is 2.*dRoverRange
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G4double lrate = log(HighestKineticEnergy/LowestKineticEnergy);
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G4double nbin = G4int((lrate/log(1.+binning) + lrate/log(1.+2.*binning))/2.);
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nbin = (nbin+50)/100;
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TotBin =int(100*nbin) ;
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if (TotBin<100) TotBin = 100;
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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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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4VIeEnergyLoss::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 G4VIeEnergyLoss::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 G4VIeEnergyLoss::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 G4VIeEnergyLoss::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;
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G4double Value, oldValue(0.);
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G4double LowEdgeEnergy, timelim;
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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 = timeVector->GetLowEdgeEnergy(i);
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tau = LowEdgeEnergy/ParticleMass;
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if (tau <= taulim) Value = clim*exp(ppar*log(tau/taulim));
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else {
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timelim = clim;
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ltaulow = log(taulim);
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ltauhigh = log(tau);
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Value = timelim+LabTimeIntLog(physicsVector,maxbint);
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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;
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ltaulow = log(tauold);
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ltauhigh = log(tau);
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Value = oldValue+LabTimeIntLog(physicsVector,maxbint);
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timeVector->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....
|
|
|
|
void G4VIeEnergyLoss::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 G4VIeEnergyLoss::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 G4VIeEnergyLoss::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 G4VIeEnergyLoss::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 G4VIeEnergyLoss::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 G4VIeEnergyLoss::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 G4VIeEnergyLoss::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 G4VIeEnergyLoss::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 G4VIeEnergyLoss::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....
|
|
|
|
G4double G4VIeEnergyLoss::GetConstraints(const G4DynamicParticle* aParticle,
|
|
G4Material* aMaterial)
|
|
{
|
|
// returns the Step limit = range here!
|
|
// it calculates dEdx and the range as well....
|
|
|
|
G4double CutInRange,StepLimit;
|
|
G4bool isOutRange;
|
|
|
|
if (aParticle->GetDefinition()->GetPDGCharge() < 0.)
|
|
{
|
|
CutInRange = G4Electron::Electron()->GetCuts();
|
|
theDEDXTable = theDEDXElectronTable;
|
|
theRangeTable = theRangeElectronTable;
|
|
theRangeCoeffATable = theeRangeCoeffATable;
|
|
theRangeCoeffBTable = theeRangeCoeffBTable;
|
|
theRangeCoeffCTable = theeRangeCoeffCTable;
|
|
}
|
|
else
|
|
{
|
|
CutInRange = G4Positron::Positron()->GetCuts();
|
|
theDEDXTable = theDEDXPositronTable;
|
|
theRangeTable = theRangePositronTable;
|
|
theRangeCoeffATable = thepRangeCoeffATable;
|
|
theRangeCoeffBTable = thepRangeCoeffBTable;
|
|
theRangeCoeffCTable = thepRangeCoeffCTable;
|
|
}
|
|
|
|
G4double Thigh = HighestKineticEnergy/RTable;
|
|
G4double KineticEnergy = aParticle->GetKineticEnergy();
|
|
EnergyBinNumber = G4int(log(KineticEnergy/LowestKineticEnergy)/LOGRTable);
|
|
|
|
G4int index = aMaterial->GetIndex();
|
|
|
|
if (KineticEnergy < LowestKineticEnergy)
|
|
{
|
|
// extrapolation for very low energy
|
|
fdEdx = sqrt(KineticEnergy/LowestKineticEnergy)*
|
|
(*theDEDXTable)(index)->GetValue(LowestKineticEnergy,isOutRange);
|
|
fRangeNow = sqrt(KineticEnergy/LowestKineticEnergy)*
|
|
(*theRangeTable)(index)->GetValue(LowestKineticEnergy,isOutRange);
|
|
StepLimit = fRangeNow;
|
|
}
|
|
else if ( KineticEnergy > Thigh)
|
|
{
|
|
// extrapolation for very high energy
|
|
fdEdx = (*theDEDXTable)(index)->GetValue(Thigh,isOutRange);
|
|
fRangeNow = (*theRangeTable)(index)->GetValue(Thigh,isOutRange);
|
|
if (fdEdx > 0.) fRangeNow += (KineticEnergy-Thigh)/fdEdx;
|
|
StepLimit = fRangeNow;
|
|
}
|
|
else
|
|
{
|
|
// LowestKineticEnergy <= KineticEnergy <= HighestKineticEnergy
|
|
fdEdx = (*theDEDXTable)(index)->GetValue(KineticEnergy,isOutRange);
|
|
G4double RgCoefA = (*(*theRangeCoeffATable)(index))(EnergyBinNumber);
|
|
G4double RgCoefB = (*(*theRangeCoeffBTable)(index))(EnergyBinNumber);
|
|
G4double RgCoefC = (*(*theRangeCoeffCTable)(index))(EnergyBinNumber);
|
|
fRangeNow = (RgCoefA*KineticEnergy+RgCoefB)*KineticEnergy+RgCoefC;
|
|
|
|
StepLimit = fRangeNow;
|
|
}
|
|
|
|
return StepLimit;
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
|
|
|
|
G4VParticleChange* G4VIeEnergyLoss::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;
|
|
|
|
G4double MeanLoss, finalT;
|
|
|
|
if (E < MinKineticEnergy) { finalT = 0.; MeanLoss = E;}
|
|
|
|
else if (EnergyBinNumber <= 0)
|
|
{
|
|
if (Step >= fRangeNow) { finalT = 0.; MeanLoss = E;}
|
|
else
|
|
{
|
|
finalT = E*(1.-Step/fRangeNow)*(1.-Step/fRangeNow);
|
|
if (finalT < MinKineticEnergy) finalT = 0.;
|
|
MeanLoss = E - finalT;
|
|
}
|
|
}
|
|
|
|
else if (EnergyBinNumber >= (TotBin-1))
|
|
{
|
|
// simple solution for the moment: loss = Step*dE/dx (dE/dx const)
|
|
MeanLoss = Step*fdEdx;
|
|
if (MeanLoss > E) MeanLoss = E;
|
|
finalT = E - MeanLoss;
|
|
if (finalT < MinKineticEnergy) { finalT = 0.; MeanLoss = E;}
|
|
}
|
|
|
|
else if (Step >= fRangeNow) { finalT = 0.; MeanLoss = E;}
|
|
|
|
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;
|
|
|
|
if (MeanLoss < 0.) { MeanLoss = 0.; finalT = E;}
|
|
|
|
//now the loss with fluctuation
|
|
if ((EnlossFlucFlag) && (finalT > 0.) && (finalT < E)&&(E > LowestKineticEnergy))
|
|
|
|
{
|
|
finalT = E-GetLossWithFluct(aParticle,aMaterial,1.,MeanLoss,Step);
|
|
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.SetNumberOfSecondaries(0);
|
|
aParticleChange.SetEnergyChange(finalT);
|
|
aParticleChange.SetLocalEnergyDeposit(E-finalT);
|
|
|
|
return &aParticleChange;
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
|
|
|
|
G4double G4VIeEnergyLoss::GetLossWithFluct(const G4DynamicParticle* aParticle,
|
|
G4Material* aMaterial,
|
|
G4double ChargeSquare,
|
|
G4double MeanLoss,
|
|
G4double step )
|
|
{
|
|
// calculate actual loss from the mean loss
|
|
// The model used to get the fluctuation is essentially the same as in Glandz in Geant3.
|
|
|
|
static const G4double minLoss = 1.*eV ;
|
|
static const G4double probLim = 0.01 ;
|
|
static const G4double sumaLim = -log(probLim) ;
|
|
static const G4double alim=10.;
|
|
static const G4double kappa = 10. ;
|
|
static const G4double factor = twopi_mc2_rcl2 ;
|
|
|
|
|
|
// 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,C,
|
|
beta2,suma,e0,loss,lossc ,w,electronDensity;
|
|
G4double a1,a2,a3;
|
|
G4int p1,p2,p3;
|
|
G4int nb;
|
|
G4double Corrfac, na,alfa,rfac,namean,sa,alfa1,ea,sea;
|
|
G4double dp1,dp3;
|
|
G4double siga ;
|
|
|
|
// shortcut for very very small loss
|
|
if(MeanLoss < minLoss) return MeanLoss ;
|
|
|
|
// get particle data
|
|
G4double Tkin = aParticle->GetKineticEnergy();
|
|
ParticleMass = aParticle->GetMass() ;
|
|
|
|
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);
|
|
|
|
if (Tm <= ipotFluct) Tm = ipotFluct ;
|
|
|
|
if(Tm > threshold) Tm = threshold;
|
|
beta2 = tau2/(tau1*tau1);
|
|
|
|
// Gaussian fluctuation ?
|
|
if(MeanLoss >= kappa*Tm)
|
|
{
|
|
electronDensity = aMaterial->GetElectronDensity() ;
|
|
siga = sqrt(MeanLoss*Tm*(0.5-0.25*beta2)*step*
|
|
factor*electronDensity*ChargeSquare/beta2) ;
|
|
loss = G4RandGauss::shoot(MeanLoss,siga) ;
|
|
if(loss < 0.) loss = 0. ;
|
|
return loss ;
|
|
}
|
|
|
|
w1 = Tm/ipotFluct;
|
|
w2 = log(2.*electron_mass_c2*tau2);
|
|
|
|
C = MeanLoss*(1.-rateFluct)/(w2-ipotLogFluct-beta2);
|
|
|
|
a1 = C*f1Fluct*(w2-e1LogFluct-beta2)/e1Fluct;
|
|
a2 = C*f2Fluct*(w2-e2LogFluct-beta2)/e2Fluct;
|
|
if(Tm > ipotFluct)
|
|
a3 = rateFluct*MeanLoss*(Tm-ipotFluct)/(ipotFluct*Tm*log(w1));
|
|
else
|
|
{
|
|
a1 /= 1.-rateFluct ;
|
|
a2 /= 1.-rateFluct ;
|
|
a3 = 0. ;
|
|
}
|
|
|
|
suma = a1+a2+a3;
|
|
|
|
loss = 0. ;
|
|
|
|
if(suma < sumaLim) // very small Step
|
|
{
|
|
e0 = aMaterial->GetIonisation()->GetEnergy0fluct();
|
|
|
|
if(Tm == ipotFluct)
|
|
{
|
|
a3 = MeanLoss/e0;
|
|
|
|
if(a3>alim)
|
|
{
|
|
siga=sqrt(a3) ;
|
|
p3 = G4std::max(0,int(G4RandGauss::shoot(a3,siga)+0.5));
|
|
}
|
|
p3 = G4Poisson(a3);
|
|
|
|
loss = p3*e0 ;
|
|
|
|
if(p3 > 0)
|
|
loss += (1.-2.*G4UniformRand())*e0 ;
|
|
|
|
}
|
|
else
|
|
{
|
|
Tm = Tm-ipotFluct+e0 ;
|
|
a3 = MeanLoss*(Tm-e0)/(Tm*e0*log(Tm/e0));
|
|
|
|
if(a3>alim)
|
|
{
|
|
siga=sqrt(a3) ;
|
|
p3 = G4std::max(0,int(G4RandGauss::shoot(a3,siga)+0.5));
|
|
}
|
|
else
|
|
p3 = G4Poisson(a3);
|
|
|
|
if(p3 > 0)
|
|
{
|
|
w = (Tm-e0)/Tm ;
|
|
if(p3 > nmaxCont2)
|
|
{
|
|
dp3 = G4float(p3) ;
|
|
Corrfac = dp3/G4float(nmaxCont2) ;
|
|
p3 = nmaxCont2 ;
|
|
}
|
|
else
|
|
Corrfac = 1. ;
|
|
|
|
for(G4int i=0; i<p3; i++) loss += 1./(1.-w*G4UniformRand()) ;
|
|
loss *= e0*Corrfac ;
|
|
}
|
|
}
|
|
}
|
|
|
|
else // not so small Step
|
|
{
|
|
// excitation type 1
|
|
if(a1>alim)
|
|
{
|
|
siga=sqrt(a1) ;
|
|
p1 = G4std::max(0,int(G4RandGauss::shoot(a1,siga)+0.5));
|
|
}
|
|
else
|
|
p1 = G4Poisson(a1);
|
|
|
|
// excitation type 2
|
|
if(a2>alim)
|
|
{
|
|
siga=sqrt(a2) ;
|
|
p2 = G4std::max(0,int(G4RandGauss::shoot(a2,siga)+0.5));
|
|
}
|
|
else
|
|
p2 = G4Poisson(a2);
|
|
|
|
loss = p1*e1Fluct+p2*e2Fluct;
|
|
|
|
// smearing to avoid unphysical peaks
|
|
if(p2 > 0)
|
|
loss += (1.-2.*G4UniformRand())*e2Fluct;
|
|
else if (loss>0.)
|
|
loss += (1.-2.*G4UniformRand())*e1Fluct;
|
|
|
|
// ionisation .......................................
|
|
if(a3 > 0.)
|
|
{
|
|
if(a3>alim)
|
|
{
|
|
siga=sqrt(a3) ;
|
|
p3 = G4std::max(0,int(G4RandGauss::shoot(a3,siga)+0.5));
|
|
}
|
|
else
|
|
p3 = G4Poisson(a3);
|
|
|
|
lossc = 0.;
|
|
if(p3 > 0)
|
|
{
|
|
na = 0.;
|
|
alfa = 1.;
|
|
if (p3 > nmaxCont2)
|
|
{
|
|
dp3 = G4float(p3);
|
|
rfac = dp3/(G4float(nmaxCont2)+dp3);
|
|
namean = G4float(p3)*rfac;
|
|
sa = G4float(nmaxCont1)*rfac;
|
|
na = G4RandGauss::shoot(namean,sa);
|
|
if (na > 0.)
|
|
{
|
|
alfa = w1*G4float(nmaxCont2+p3)/(w1*G4float(nmaxCont2)+G4float(p3));
|
|
alfa1 = alfa*log(alfa)/(alfa-1.);
|
|
ea = na*ipotFluct*alfa1;
|
|
sea = ipotFluct*sqrt(na*(alfa-alfa1*alfa1));
|
|
lossc += G4RandGauss::shoot(ea,sea);
|
|
}
|
|
}
|
|
|
|
nb = G4int(G4float(p3)-na);
|
|
if (nb > 0)
|
|
{
|
|
w2 = alfa*ipotFluct;
|
|
w = (Tm-w2)/Tm;
|
|
for (G4int k=0; k<nb; k++) lossc += w2/(1.-w*G4UniformRand());
|
|
|
|
}
|
|
}
|
|
loss += lossc;
|
|
}
|
|
}
|
|
|
|
return loss ;
|
|
|
|
}
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
|
|
|
|
|
|
|