Gabriele Cosmo
161 lines
6.1 KiB
Plaintext
161 lines
6.1 KiB
Plaintext
//
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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: G4VIMuEnergyLoss.icc,v 1.1.2.2 2001/06/28 20:19:19 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 inlined methods file
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//
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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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// ------------ G4VIMuEnergyLoss 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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// correction for KineticEnergy< LowestKineticEnergy by L.Urban on 27/11/97
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// corrections by L. Urban on 27/05/98 ( other corrs come soon!)
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// ---------------------------------------------------------------
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inline G4double G4VIMuEnergyLoss::GetConstraints(const G4DynamicParticle *aParticle,
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G4Material *aMaterial)
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{
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// returns the Step limit
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// dToverTini is the max. allowed relative range loss in one Step
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// it calculates dEdx and the range as well....
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G4double KineticEnergy,StepLimit;
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const G4double BigStep = DBL_MAX ;
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G4bool isOutRange ;
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G4int index,bin ;
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if(aParticle->GetDefinition()->GetPDGCharge()>0.)
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{
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theDEDXTable = theDEDXmuplusTable ;
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theRangeTable = theRangemuplusTable ;
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theRangeCoeffATable=themuplusRangeCoeffATable ;
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theRangeCoeffBTable=themuplusRangeCoeffBTable ;
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theRangeCoeffCTable=themuplusRangeCoeffCTable ;
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}
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else
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{
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theDEDXTable = theDEDXmuminusTable ;
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theRangeTable = theRangemuminusTable ;
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theRangeCoeffATable=themuminusRangeCoeffATable ;
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theRangeCoeffBTable=themuminusRangeCoeffBTable ;
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theRangeCoeffCTable=themuminusRangeCoeffCTable ;
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}
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// min.stepsize = p*CutInRange at energy , where range=p*CutInRange
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// random steplimit.........................
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const G4double p=1. , cc=p*CutInRange ;
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const G4double c1=dToverTini , c2=(1.-2.*dToverTini)*cc ,
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c3=dToverTini*cc*cc ;
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const G4double rangelim=1.5*cc ;
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const G4double Thigh = 0.9*HighestKineticEnergy ;
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const G4double alfa = 0.05 , alfa1 = 1.-alfa , alfa2 = 2.*alfa ;
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KineticEnergy = aParticle->GetKineticEnergy();
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bin = G4int(log(KineticEnergy/LowestKineticEnergy)/LOGRTable) ;
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EnergyBinNumber = bin ;
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index = aMaterial->GetIndex() ;
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if( KineticEnergy < LowestKineticEnergy )
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{
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fdEdx = sqrt(KineticEnergy/LowestKineticEnergy)*
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(*theDEDXTable)(index)->GetValue(LowestKineticEnergy,isOutRange) ;
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fRangeNow = sqrt(KineticEnergy/LowestKineticEnergy)*
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(*theRangeTable)(index)->GetValue(LowestKineticEnergy,isOutRange) ;
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StepLimit = fRangeNow ;
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}
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else
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{
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if ( KineticEnergy > HighestKineticEnergy )
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StepLimit = BigStep ;
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else
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{
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fdEdx = (*theDEDXTable)(index)->
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GetValue(KineticEnergy,isOutRange) ;
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RangeCoeffA = (*(*theRangeCoeffATable)(index))(EnergyBinNumber) ;
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RangeCoeffB = (*(*theRangeCoeffBTable)(index))(EnergyBinNumber) ;
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RangeCoeffC = (*(*theRangeCoeffCTable)(index))(EnergyBinNumber) ;
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fRangeNow = (RangeCoeffA*KineticEnergy+RangeCoeffB)
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*KineticEnergy+RangeCoeffC ;
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// vacuum ?
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if(fRangeNow>=BigStep)
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StepLimit = BigStep ;
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else
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{
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// new method to compute the (random) Step limit ..............
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if(fRangeNow>cc)
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{
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StepLimit = c1*fRangeNow+c2+c3/fRangeNow ;
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// randomise this value
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StepLimit = cc + (StepLimit-cc)*G4UniformRand() ;
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if(StepLimit > fRangeNow) StepLimit = fRangeNow ;
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}
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else
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StepLimit = fRangeNow ;
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}
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}
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}
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return StepLimit ;
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}
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inline G4double G4VIMuEnergyLoss::GetContinuousStepLimit(
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const G4Track& track,
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G4double,
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G4double currentMinimumStep,
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G4double&)
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{
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G4double Step =
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GetConstraints(track.GetDynamicParticle(),track.GetMaterial()) ;
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if((Step>0.0)&&(Step<currentMinimumStep))
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currentMinimumStep = Step ;
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return Step ;
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}
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inline G4bool G4VIMuEnergyLoss::IsApplicable(const G4ParticleDefinition&
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particle)
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{
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return ( (&particle == (const G4ParticleDefinition *)theMuonPlus)
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||(&particle == (const G4ParticleDefinition *)theMuonMinus)
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);
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}
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