#include <CMSmplIonisationWithDeltaModel.h>

Inheritance diagram for CMSmplIonisationWithDeltaModel:

Public Member Functions
	CMSmplIonisationWithDeltaModel (G4double mCharge, const G4String &nam="mplIonisationWithDelta")

G4double	ComputeCrossSectionPerAtom (const G4ParticleDefinition *, G4double kineticEnergy, G4double Z, G4double A, G4double cutEnergy, G4double maxEnergy) override

virtual G4double	ComputeCrossSectionPerElectron (const G4ParticleDefinition *, G4double kineticEnergy, G4double cutEnergy, G4double maxEnergy)

G4double	ComputeDEDXPerVolume (const G4Material , const G4ParticleDefinition , G4double kineticEnergy, G4double cutEnergy) override

G4double	Dispersion (const G4Material , const G4DynamicParticle , G4double tmax, G4double length) override

void	Initialise (const G4ParticleDefinition *, const G4DataVector &) override

G4double	MinEnergyCut (const G4ParticleDefinition , const G4MaterialCutsCouple couple) override

G4double	SampleFluctuations (const G4MaterialCutsCouple , const G4DynamicParticle , G4double tmax, G4double length, G4double meanLoss) override

void	SampleSecondaries (std::vector< G4DynamicParticle * > , const G4MaterialCutsCouple , const G4DynamicParticle *, G4double tmin, G4double maxEnergy) override

void	SetParticle (const G4ParticleDefinition *p)

	~CMSmplIonisationWithDeltaModel () override

Protected Member Functions
G4double	MaxSecondaryEnergy (const G4ParticleDefinition *, G4double kinEnergy) override

Private Member Functions
G4double	ComputeDEDXAhlen (const G4Material *material, G4double bg2, G4double cut)

Private Attributes
G4double	beta2lim

G4double	betalim

G4double	betalow

G4double	bg2lim

G4double	chargeSquare

G4double	dedxlim

G4ParticleChangeForLoss *	fParticleChange

G4double	magCharge

G4double	mass

const G4ParticleDefinition *	monopole

G4int	nmpl

G4double	pi_hbarc2_over_mc2

G4ParticleDefinition *	theElectron

G4double	twoln10

Static Private Attributes
static std::vector< G4double > *	dedx0 = nullptr

Detailed Description

Definition at line 29 of file CMSmplIonisationWithDeltaModel.h.

Constructor & Destructor Documentation

CMSmplIonisationWithDeltaModel::CMSmplIonisationWithDeltaModel	(	G4double	mCharge,
		const G4String &	nam = `"mplIonisationWithDelta"`
	)

explicit

Definition at line 41 of file CMSmplIonisationWithDeltaModel.cc.

References funct::abs(), chargeSquare, dedxlim, nanoDQM_cff::Electron, fParticleChange, g, ecalTB2006H4_GenSimDigiReco_cfg::G4cout, GeV, hbarc, magCharge, mass, monopole, nmpl, pi, pi_hbarc2_over_mc2, and theElectron.

   : G4VEmModel(nam),G4VEmFluctuationModel(nam),
   magCharge(mCharge),
   twoln10(std::log(100.0)),
   betalow(0.01),
   betalim(0.1),
   beta2lim(betalim*betalim),
   bg2lim(beta2lim*(1.0 + beta2lim))
 {
   nmpl = G4lrint(std::abs(magCharge) * 2 * fine_structure_const);
   if(nmpl > 6)      { nmpl = 6; }
   else if(nmpl < 1) { nmpl = 1; }
   pi_hbarc2_over_mc2 = pi * hbarc * hbarc / electron_mass_c2;
   chargeSquare = magCharge * magCharge;
   dedxlim = 45.*nmpl*nmpl*GeV*cm2/g;
   fParticleChange = nullptr;
   theElectron = G4Electron::Electron();
   G4cout << "### Monopole ionisation model with d-electron production, Gmag= " 
          << magCharge/eplus << G4endl;
   monopole = nullptr;
   mass = 0.0;
 }

CMSmplIonisationWithDeltaModel::~CMSmplIonisationWithDeltaModel ( )

override

Definition at line 67 of file CMSmplIonisationWithDeltaModel.cc.

References dedx0.

 {
   if(IsMaster()) { delete dedx0; }
 }

Member Function Documentation

G4double CMSmplIonisationWithDeltaModel::ComputeCrossSectionPerAtom	(	const G4ParticleDefinition *	p,
		G4double	kineticEnergy,
		G4double	Z,
		G4double	A,
		G4double	cutEnergy,
		G4double	maxEnergy
	)

override

Definition at line 221 of file CMSmplIonisationWithDeltaModel.cc.

References ComputeCrossSectionPerElectron(), and cross().

 {
   G4double cross = 
     Z*ComputeCrossSectionPerElectron(p,kineticEnergy,cutEnergy,maxEnergy);
   return cross;
 }

G4double CMSmplIonisationWithDeltaModel::ComputeCrossSectionPerElectron	(	const G4ParticleDefinition *	p,
		G4double	kineticEnergy,
		G4double	cutEnergy,
		G4double	maxEnergy
	)

virtual

Definition at line 203 of file CMSmplIonisationWithDeltaModel.cc.

References cross(), SiStripPI::max, particleFlowClusterECALTimeSelected_cfi::maxEnergy, MaxSecondaryEnergy(), min(), monopole, nmpl, pi_hbarc2_over_mc2, SetParticle(), and tmax.

Referenced by ComputeCrossSectionPerAtom().

 {
   if(!monopole) { SetParticle(p); }
   G4double tmax = MaxSecondaryEnergy(p, kineticEnergy);
   G4double maxEnergy = std::min(tmax, maxKinEnergy);
   G4double cutEnergy = std::max(LowEnergyLimit(), cut);
   G4double cross = (cutEnergy < maxEnergy) 
     ? (0.5/cutEnergy - 0.5/maxEnergy)*pi_hbarc2_over_mc2 * nmpl * nmpl : 0.0;
   return cross;
 }

G4double CMSmplIonisationWithDeltaModel::ComputeDEDXAhlen	(	const G4Material *	material,
		G4double	bg2,
		G4double	cut
	)

private

Definition at line 169 of file CMSmplIonisationWithDeltaModel.cc.

References TtFullHadDaughter::B, gen::k, SiStripPI::max, nmpl, pi_hbarc2_over_mc2, twoln10, and x.

Referenced by ComputeDEDXPerVolume().

 {
   G4double eDensity = material->GetElectronDensity();
   G4double eexc  = material->GetIonisation()->GetMeanExcitationEnergy();
 
   // Ahlen's formula for nonconductors, [1]p157, f(5.7)
   G4double dedx = 
     0.5*(G4Log(2.0*electron_mass_c2*bg2*cutEnergy/(eexc*eexc)) -1.0);
 
   // Kazama et al. cross-section correction
   G4double  k = 0.406;
   if(nmpl > 1) { k = 0.346; }
 
   // Bloch correction
   const G4double B[7] = { 0.0, 0.248, 0.672, 1.022, 1.243, 1.464, 1.685}; 
 
   dedx += 0.5 * k - B[nmpl];
 
   // density effect correction
   G4double x = G4Log(bg2)/twoln10;
   dedx -= material->GetIonisation()->DensityCorrection(x);
 
   // now compute the total ionization loss
   dedx *=  pi_hbarc2_over_mc2 * eDensity * nmpl * nmpl;
 
   dedx = std::max(dedx, 0.0);
   return dedx;
 }

G4double CMSmplIonisationWithDeltaModel::ComputeDEDXPerVolume	(	const G4Material *	material,
		const G4ParticleDefinition *	p,
		G4double	kineticEnergy,
		G4double	cutEnergy
	)

override

Definition at line 128 of file CMSmplIonisationWithDeltaModel.cc.

References pfBoostedDoubleSVAK8TagInfos_cfi::beta, betalim, betalow, bg2lim, ComputeDEDXAhlen(), mass, SiStripPI::max, MaxSecondaryEnergy(), min(), monopole, SetParticle(), mathSSE::sqrt(), metsig::tau, and tmax.

 {
   if(!monopole) { SetParticle(p); }
   G4double tmax = MaxSecondaryEnergy(p,kineticEnergy);
   G4double cutEnergy = std::min(tmax, maxEnergy);
   cutEnergy = std::max(LowEnergyLimit(), cutEnergy);
   G4double tau   = kineticEnergy / mass;
   G4double gam   = tau + 1.0;
   G4double bg2   = tau * (tau + 2.0);
   G4double beta2 = bg2 / (gam * gam);
   G4double beta  = sqrt(beta2);
 
   // low-energy asymptotic formula
   G4double dedx = (*dedx0)[CurrentCouple()->GetIndex()]*beta;
 
   // above asymptotic
   if(beta > betalow) {
 
     // high energy
     if(beta >= betalim) {
       dedx = ComputeDEDXAhlen(material, bg2, cutEnergy);
 
     } else {
       G4double dedx1 = (*dedx0)[CurrentCouple()->GetIndex()]*betalow;
       G4double dedx2 = ComputeDEDXAhlen(material, bg2lim, cutEnergy);
 
       // extrapolation between two formula 
       G4double kapa2 = beta - betalow;
       G4double kapa1 = betalim - beta;
       dedx = (kapa1*dedx1 + kapa2*dedx2)/(kapa1 + kapa2);
     }
   }
   return dedx;
 }

G4double CMSmplIonisationWithDeltaModel::Dispersion	(	const G4Material *	material,
		const G4DynamicParticle *	dp,
		G4double	tmax,
		G4double	length
	)

override

Definition at line 325 of file CMSmplIonisationWithDeltaModel.cc.

References chargeSquare, mass, and metsig::tau.

Referenced by SampleFluctuations().

 {
   G4double siga = 0.0;
   G4double tau   = dp->GetKineticEnergy()/mass;
   if(tau > 0.0) { 
     G4double electronDensity = material->GetElectronDensity();
     G4double gam   = tau + 1.0;
     G4double invbeta2 = (gam*gam)/(tau * (tau+2.0));
     siga  = (invbeta2 - 0.5) * twopi_mc2_rcl2 * tmax * length
       * electronDensity * chargeSquare;
   }
   return siga;
 }

void CMSmplIonisationWithDeltaModel::Initialise	(	const G4ParticleDefinition *	p,
		const G4DataVector &
	)

override

Definition at line 89 of file CMSmplIonisationWithDeltaModel.cc.

References dedx0, fParticleChange, mps_fire::i, monopole, gen::n, nmpl, pi, pi_hbarc2_over_mc2, and SetParticle().

 {
   if(!monopole) { SetParticle(p); }
   if(!fParticleChange) { fParticleChange = GetParticleChangeForLoss(); }
   if(IsMaster()) {
     if(!dedx0) { dedx0 = new std::vector<G4double>; }
     G4ProductionCutsTable* theCoupleTable=
       G4ProductionCutsTable::GetProductionCutsTable();
     G4int numOfCouples = theCoupleTable->GetTableSize();
     G4int n = dedx0->size();
     if(n < numOfCouples) { dedx0->resize(numOfCouples); }
     G4Pow* g4calc = G4Pow::GetInstance();
 
     // initialise vector
     for(G4int i=0; i<numOfCouples; ++i) {
 
       const G4Material* material = 
         theCoupleTable->GetMaterialCutsCouple(i)->GetMaterial();
       G4double eDensity = material->GetElectronDensity();
       G4double vF = electron_Compton_length*g4calc->A13(3.*pi*pi*eDensity);
       (*dedx0)[i] = pi_hbarc2_over_mc2*eDensity*nmpl*nmpl*
         (G4Log(2*vF/fine_structure_const) - 0.5)/vF;
     }
   }
 }

G4double CMSmplIonisationWithDeltaModel::MaxSecondaryEnergy	(	const G4ParticleDefinition *	,
		G4double	kinEnergy
	)

overrideprotected

Definition at line 345 of file CMSmplIonisationWithDeltaModel.cc.

References mass, and metsig::tau.

Referenced by ComputeCrossSectionPerElectron(), ComputeDEDXPerVolume(), and SampleSecondaries().

 {
   G4double tau = kinEnergy/mass;
   return 2.0*electron_mass_c2*tau*(tau + 2.);
 }

G4double CMSmplIonisationWithDeltaModel::MinEnergyCut	(	const G4ParticleDefinition *	,
		const G4MaterialCutsCouple *	couple
	)

override

Definition at line 119 of file CMSmplIonisationWithDeltaModel.cc.

 {
   return couple->GetMaterial()->GetIonisation()->GetMeanExcitationEnergy();
 }

G4double CMSmplIonisationWithDeltaModel::SampleFluctuations	(	const G4MaterialCutsCouple *	couple,
		const G4DynamicParticle *	dp,
		G4double	tmax,
		G4double	length,
		G4double	meanLoss
	)

override

Definition at line 294 of file CMSmplIonisationWithDeltaModel.cc.

References Dispersion(), mathSSE::sqrt(), tmax, and x.

 {
   G4double siga = Dispersion(couple->GetMaterial(),dp,tmax,length);
   G4double loss = meanLoss;
   siga = sqrt(siga);
   G4double twomeanLoss = meanLoss + meanLoss;
 
   if(twomeanLoss < siga) {
     G4double x;
     do {
       loss = twomeanLoss*G4UniformRand();
       x = (loss - meanLoss)/siga;
       // Loop checking, 07-Aug-2015, Vladimir Ivanchenko
     } while (1.0 - 0.5*x*x < G4UniformRand());
   } else {
     do {
       loss = G4RandGauss::shoot(meanLoss,siga);
       // Loop checking, 07-Aug-2015, Vladimir Ivanchenko
     } while (0.0 > loss || loss > twomeanLoss);
   }
   return loss;
 }

void CMSmplIonisationWithDeltaModel::SampleSecondaries	(	std::vector< G4DynamicParticle * > *	vdp,
		const G4MaterialCutsCouple *	,
		const G4DynamicParticle *	dp,
		G4double	tmin,
		G4double	maxEnergy
	)

override

Definition at line 236 of file CMSmplIonisationWithDeltaModel.cc.

References funct::cos(), delta, fParticleChange, mass, MaxSecondaryEnergy(), min(), phi, lumiQueryAPI::q, funct::sin(), mathSSE::sqrt(), theElectron, and tmax.

 {
   G4double kineticEnergy = dp->GetKineticEnergy();
   G4double tmax = MaxSecondaryEnergy(dp->GetDefinition(),kineticEnergy);
 
   G4double maxKinEnergy = std::min(maxEnergy,tmax);
   if(minKinEnergy >= maxKinEnergy) { return; }
 
   //G4cout << "CMSmplIonisationWithDeltaModel::SampleSecondaries: E(GeV)= "
   //         << kineticEnergy/GeV << " M(GeV)= " << mass/GeV
   //         << " tmin(MeV)= " << minKinEnergy/MeV << G4endl;
 
   G4double totEnergy     = kineticEnergy + mass;
   G4double etot2         = totEnergy*totEnergy;
   G4double beta2         = kineticEnergy*(kineticEnergy + 2.0*mass)/etot2;
   
   // sampling without nuclear size effect
   G4double q = G4UniformRand();
   G4double deltaKinEnergy = minKinEnergy*maxKinEnergy
     /(minKinEnergy*(1.0 - q) + maxKinEnergy*q);
 
   // delta-electron is produced
   G4double totMomentum = totEnergy*sqrt(beta2);
   G4double deltaMomentum =
            sqrt(deltaKinEnergy * (deltaKinEnergy + 2.0*electron_mass_c2));
   G4double cost = deltaKinEnergy * (totEnergy + electron_mass_c2) /
                                    (deltaMomentum * totMomentum);
   cost = std::min(cost, 1.0);
 
   G4double sint = sqrt((1.0 - cost)*(1.0 + cost));
 
   G4double phi = twopi * G4UniformRand() ;
 
   G4ThreeVector deltaDirection(sint*cos(phi),sint*sin(phi), cost);
   const G4ThreeVector& direction = dp->GetMomentumDirection();
   deltaDirection.rotateUz(direction);
 
   // create G4DynamicParticle object for delta ray
   G4DynamicParticle* delta = 
     new G4DynamicParticle(theElectron,deltaDirection,deltaKinEnergy);
 
   vdp->push_back(delta);
 
   // Change kinematics of primary particle
   kineticEnergy       -= deltaKinEnergy;
   G4ThreeVector finalP = direction*totMomentum - deltaDirection*deltaMomentum;
   finalP               = finalP.unit();
 
   fParticleChange->SetProposedKineticEnergy(kineticEnergy);
   fParticleChange->SetProposedMomentumDirection(finalP);
 }

void CMSmplIonisationWithDeltaModel::SetParticle ( const G4ParticleDefinition * p )

Definition at line 74 of file CMSmplIonisationWithDeltaModel.cc.

References beta2lim, betalow, mass, SiStripPI::max, min(), monopole, AlCaHLTBitMon_ParallelJobs::p, and mathSSE::sqrt().

Referenced by ComputeCrossSectionPerElectron(), ComputeDEDXPerVolume(), Initialise(), and CMSmplIonisation::InitialiseEnergyLossProcess().

 {
   monopole = p;
   mass     = monopole->GetPDGMass();
   G4double emin = 
     std::min(LowEnergyLimit(),0.1*mass*(1./sqrt(1. - betalow*betalow) - 1.)); 
   G4double emax = 
     std::max(HighEnergyLimit(),10*mass*(1./sqrt(1. - beta2lim) - 1.)); 
   SetLowEnergyLimit(emin);
   SetHighEnergyLimit(emax);
 }