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G4RToEConvForProton.cc
Go to the documentation of this file.
Or view
the newest version in sPHENIX GitHub for file G4RToEConvForProton.cc
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//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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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. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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//
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//
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//
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// --------------------------------------------------------------
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// GEANT 4 class implementation file/ History:
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// 5 Oct. 2002, H.Kuirashige : Structure created based on object model
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// --------------------------------------------------------------
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#include "
G4RToEConvForProton.hh
"
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#include "
G4ParticleTable.hh
"
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#include "
G4Material.hh
"
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#include "
G4PhysicsLogVector.hh
"
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#include "
G4ios.hh
"
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#include "
G4PhysicalConstants.hh
"
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#include "
G4SystemOfUnits.hh
"
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G4RToEConvForProton::G4RToEConvForProton
()
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:
G4VRangeToEnergyConverter
(),
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Mass(0.0),
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Z
(-1.),
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tau0(0.0), taul(0.0), taum(0.0),
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ionpot(0.0),
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ca(0.0), cba(0.0), cc(0.0)
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{
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theParticle
=
G4ParticleTable::GetParticleTable
()->
FindParticle
(
"proton"
);
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if
(
theParticle
==0) {
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#ifdef G4VERBOSE
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if
(
GetVerboseLevel
()>0) {
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G4cout
<<
" G4RToEConvForProton::G4RToEConvForProton() "
;
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G4cout
<<
" proton is not defined !!"
<<
G4endl
;
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}
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#endif
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}
else
{
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Mass
=
theParticle
->
GetPDGMass
();
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}
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}
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G4RToEConvForProton::~G4RToEConvForProton
()
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{
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}
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G4double
G4RToEConvForProton::Convert
(
G4double
rangeCut,
const
G4Material
* )
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{
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// Simple formula
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// range = Ekin/(100*keV)*(1*mm);
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return
(rangeCut/(1.0*
mm
)) * (100.0*
keV
);
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}
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// **********************************************************************
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// ************************* ComputeLoss ********************************
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// **********************************************************************
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G4double
G4RToEConvForProton::ComputeLoss
(
G4double
AtomicNumber,
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G4double
KineticEnergy)
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{
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// calculate dE/dx
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const
G4double
z2Particle = 1.0;
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if
( std::fabs(AtomicNumber-
Z
)>0.1 ){
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// recalculate constants
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Z
= AtomicNumber;
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G4double
Z13 = std::exp(std::log(
Z
)/3.);
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tau0
= 0.1*Z13*
MeV
/
proton_mass_c2
;
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taum
= 0.035*Z13*
MeV
/
proton_mass_c2
;
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taul
= 2.*
MeV
/
proton_mass_c2
;
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ionpot
= 1.6e-5*
MeV
*std::exp(0.9*std::log(
Z
));
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cc
= (
taul
+1.)*(
taul
+1.)*std::log(2.*
electron_mass_c2
*
taul
*(
taul
+2.)/
ionpot
)/(
taul
*(
taul
+2.))-1.;
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cc
= 2.*
twopi_mc2_rcl2
*
Z
*
cc
*std::sqrt(
taul
);
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ca
=
cc
/((1.-0.5*std::sqrt(
tau0
/
taum
))*
tau0
);
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cba
= -0.5/std::sqrt(
taum
);
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}
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G4double
tau = KineticEnergy/
Mass
;
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G4double
dEdx;
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if
( tau <=
tau0
) {
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dEdx =
ca
*(std::sqrt(tau)+
cba
*tau);
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}
else
{
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if
( tau <=
taul
) {
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dEdx =
cc
/std::sqrt(tau);
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}
else
{
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dEdx = (tau+1.)*(tau+1.)*
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std::log(2.*
electron_mass_c2
*tau*(tau+2.)/
ionpot
)/(tau*(tau+2.))-1.;
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dEdx = 2.*
twopi_mc2_rcl2
*
Z
*dEdx;
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}
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}
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return
dEdx*z2Particle ;
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}
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// **********************************************************************
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// ************************* Reset ********************************
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// **********************************************************************
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void
G4RToEConvForProton::Reset
()
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{
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// do nothing because loss tables and range vectors are not used
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return
;
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}
geant4
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geant4-10.6-release
source
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src
G4RToEConvForProton.cc
Built by
Jin Huang
. updated:
Wed Jun 29 2022 17:25:28
using
1.8.2 with
ECCE GitHub integration