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This commit is contained in:
Gabriele Cosmo
2016-06-09 15:58:43 +02:00
parent 96c8bcd0af
commit b79225fb37
7544 changed files with 245407 additions and 91099 deletions
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source/processes/electromagnetic/utils/src/G4ionEffectiveCharge.cc
+55 -25
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@@ -23,8 +23,8 @@
// * acceptance of all terms of the Geant4 Software license. *
// ********************************************************************
//
// $Id: G4ionEffectiveCharge.cc,v 1.17 2007/09/27 17:08:58 vnivanch Exp $
// GEANT4 tag $Name: geant4-09-01 $
// $Id: G4ionEffectiveCharge.cc,v 1.24 2008/12/18 13:01:46 gunter Exp $
// GEANT4 tag $Name: geant4-09-02 $
//
// -------------------------------------------------------------------
//
@@ -53,19 +53,24 @@
#include "G4ionEffectiveCharge.hh"
#include "G4UnitsTable.hh"
#include "G4ParticleDefinition.hh"
#include "G4Material.hh"
#include "G4NistManager.hh"
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4ionEffectiveCharge::G4ionEffectiveCharge()
{
chargeCorrection = 1.0;
energyHighLimit = 10.0*MeV;
energyHighLimit = 20.0*MeV;
energyLowLimit = 1.0*keV;
energyBohr = 25.*keV;
massFactor = amu_c2/(proton_mass_c2*keV);
minCharge = 0.1;
minCharge = 1.0;
lastPart = 0;
lastMat = 0;
lastKinEnergy = 0.0;
effCharge = eplus;
nist = G4NistManager::Instance();
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
@@ -77,13 +82,21 @@ G4ionEffectiveCharge::~G4ionEffectiveCharge()
G4double G4ionEffectiveCharge::EffectiveCharge(const G4ParticleDefinition* p,
const G4Material* material,
G4double kineticEnergy)
G4double kineticEnergy)
{
if(p == lastPart && material == lastMat && kineticEnergy == lastKinEnergy)
return effCharge;
lastPart = p;
lastMat = material;
lastKinEnergy = kineticEnergy;
G4double mass = p->GetPDGMass();
G4double charge = p->GetPDGCharge();
G4double Zi = charge/eplus;
chargeCorrection = 1.0;
effCharge = charge;
// The aproximation of ion effective charge from:
// J.F.Ziegler, J.P. Biersack, U. Littmark
@@ -93,16 +106,15 @@ G4double G4ionEffectiveCharge::EffectiveCharge(const G4ParticleDefinition* p,
G4double reducedEnergy = kineticEnergy * proton_mass_c2/mass ;
if( reducedEnergy > Zi*energyHighLimit || Zi < 1.5 || !material) return charge;
static G4double c[6] = {0.2865, 0.1266, -0.001429,
0.02402,-0.01135, 0.001475} ;
G4double z = material->GetIonisation()->GetZeffective();
reducedEnergy = std::max(reducedEnergy,energyLowLimit);
G4double q;
// reducedEnergy = std::max(reducedEnergy,energyLowLimit);
// Helium ion case
if( Zi < 2.5 ) {
static G4double c[6] = {0.2865, 0.1266, -0.001429,
0.02402,-0.01135, 0.001475} ;
G4double Q = std::max(0.0,std::log(reducedEnergy*massFactor));
G4double x = c[0];
G4double y = 1.0;
@@ -119,23 +131,25 @@ G4double G4ionEffectiveCharge::EffectiveCharge(const G4ParticleDefinition* p,
G4double tt = ( 0.007 + 0.00005 * z );
if(tq2 < 0.2) tt *= (1.0 - tq2 + 0.5*tq2*tq2);
else tt *= std::exp(-tq2);
q = (1.0 + tt) * std::sqrt(ex);
effCharge = charge*(1.0 + tt) * std::sqrt(ex);
// Heavy ion case
} else {
G4double z23 = std::pow(z, 0.666666);
G4double zi13 = std::pow(Zi, 0.333333);
G4double y;
// = nist->GetZ13(z);
//G4double z23 = y*y;
G4double zi13 = nist->GetZ13(Zi);
G4double zi23 = zi13*zi13;
G4double e = std::max(reducedEnergy,energyBohr/z23);
// G4double e = std::max(reducedEnergy,energyBohr/z23);
//G4double e = reducedEnergy;
// v1 is ion velocity in vF unit
G4double eF = material->GetIonisation()->GetFermiEnergy();
G4double v1sq = e/eF;
G4double v1sq = reducedEnergy/eF;
G4double vFsq = eF/energyBohr;
G4double vF = std::sqrt(vFsq);
G4double y ;
G4double vF = std::sqrt(eF/energyBohr);
// Faster than Fermi velocity
if ( v1sq > 1.0 ) {
@@ -143,18 +157,33 @@ G4double G4ionEffectiveCharge::EffectiveCharge(const G4ParticleDefinition* p,
// Slower than Fermi velocity
} else {
y = 0.6923 * vF * (1.0 + 0.666666*v1sq + v1sq*v1sq/15.0) / zi23 ;
y = 0.692308 * vF * (1.0 + 0.666666*v1sq + v1sq*v1sq/15.0) / zi23 ;
}
G4double q;
G4double y3 = std::pow(y, 0.3) ;
// G4cout << "y= " << y << " y3= " << y3 << " v1= " << v1 << " vF= " << vF << G4endl;
// G4cout<<"y= "<<y<<" y3= "<<y3<<" v1= "<<v1<<" vF= "<<vF<<G4endl;
q = 1.0 - std::exp( 0.803*y3 - 1.3167*y3*y3 - 0.38157*y - 0.008983*y*y ) ;
//y *= 0.77;
//y *= (0.75 + 0.52/Zi);
// q = 1.0 - std::exp(-0.95*std::sqrt(reducedEnergy/energyBohr)/zi23);
//if( y < 0.2 ) q = y*(1.0 - 0.5*y);
//else q = 1.0 - std::exp(-y);
G4double qmin = minCharge/Zi;
if(q < qmin) q = qmin;
effCharge = q*charge;
/*
G4double x1 = 1.0*effCharge*(1.0 - 0.132*std::log(y))/(y*std::sqrt(z));
G4double x2 = 0.1*effCharge*effCharge*energyBohr/reducedEnergy;
chargeCorrection = 1.0 + x1 - x2;
G4cout << "x1= "<<x1<<" x2= "<< x2<<" corr= "<<chargeCorrection<<G4endl;
*/
G4double tq = 7.6 - std::log(reducedEnergy/keV);
G4double tq2= tq*tq;
@@ -169,7 +198,7 @@ G4double G4ionEffectiveCharge::EffectiveCharge(const G4ParticleDefinition* p,
// Nucl. Inst. & Meth. in Phys. Res. B35 (1988) 215-228.
G4double lambda = 10.0 * vF / (zi13 * (6.0 + q));
if(q < 0.2) lambda *= (1.0 - 0.666666*q - 0.444444*q*q);
if(q < 0.2) lambda *= (1.0 - 0.66666667*q - q*q/9.0);
else lambda *= std::pow(1.0-q, 0.666666);
G4double lambda2 = lambda*lambda;
@@ -179,11 +208,12 @@ G4double G4ionEffectiveCharge::EffectiveCharge(const G4ParticleDefinition* p,
else xx *= std::log(1.0 + lambda2);
chargeCorrection = sq * (1.0 + xx);
}
// G4cout << "G4ionEffectiveCharge: charge= " << charge << " q= " << q
// << " chargeCor= " << chargeCorrection
// << " e(MeV)= " << kineticEnergy/MeV << G4endl;
return q*charge;
return effCharge;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....