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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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25 //
26 //
27 //
28 //
29 // --------------------------------------------------------------
30 // GEANT 4 class implementation file/ History:
31 // 5 Oct. 2002, H.Kuirashige : Structure created based on object model
32 // --------------------------------------------------------------
33 
34 #include "G4RToEConvForProton.hh"
35 #include "G4ParticleTable.hh"
36 #include "G4Material.hh"
37 #include "G4PhysicsLogVector.hh"
38 
39 #include "G4ios.hh"
40 #include "G4PhysicalConstants.hh"
41 #include "G4SystemOfUnits.hh"
42 
45  Mass(0.0),
46  Z(-1.),
47  tau0(0.0), taul(0.0), taum(0.0),
48  ionpot(0.0),
49  ca(0.0), cba(0.0), cc(0.0)
50 {
52  if (theParticle ==0) {
53 #ifdef G4VERBOSE
54  if (GetVerboseLevel()>0) {
55  G4cout << " G4RToEConvForProton::G4RToEConvForProton() ";
56  G4cout << " proton is not defined !!" << G4endl;
57  }
58 #endif
59  } else {
61  }
62 }
63 
65 {
66 }
67 
68 
70 {
71  // Simple formula
72  // range = Ekin/(100*keV)*(1*mm);
73  return (rangeCut/(1.0*mm)) * (100.0*keV);
74 }
75 
76 
77 // **********************************************************************
78 // ************************* ComputeLoss ********************************
79 // **********************************************************************
81  G4double KineticEnergy)
82 {
83  // calculate dE/dx
84  const G4double z2Particle = 1.0;
85 
86  if( std::fabs(AtomicNumber-Z)>0.1 ){
87  // recalculate constants
88  Z = AtomicNumber;
89  G4double Z13 = std::exp(std::log(Z)/3.);
90  tau0 = 0.1*Z13*MeV/proton_mass_c2;
91  taum = 0.035*Z13*MeV/proton_mass_c2;
92  taul = 2.*MeV/proton_mass_c2;
93  ionpot = 1.6e-5*MeV*std::exp(0.9*std::log(Z));
94  cc = (taul+1.)*(taul+1.)*std::log(2.*electron_mass_c2*taul*(taul+2.)/ionpot)/(taul*(taul+2.))-1.;
95  cc = 2.*twopi_mc2_rcl2*Z*cc*std::sqrt(taul);
96  ca = cc/((1.-0.5*std::sqrt(tau0/taum))*tau0);
97  cba = -0.5/std::sqrt(taum);
98  }
99 
100  G4double tau = KineticEnergy/Mass;
101  G4double dEdx;
102  if ( tau <= tau0 ) {
103  dEdx = ca*(std::sqrt(tau)+cba*tau);
104  } else {
105  if( tau <= taul ) {
106  dEdx = cc/std::sqrt(tau);
107  } else {
108  dEdx = (tau+1.)*(tau+1.)*
109  std::log(2.*electron_mass_c2*tau*(tau+2.)/ionpot)/(tau*(tau+2.))-1.;
110  dEdx = 2.*twopi_mc2_rcl2*Z*dEdx;
111  }
112  }
113  return dEdx*z2Particle ;
114 }
115 
116 
117 // **********************************************************************
118 // ************************* Reset ********************************
119 // **********************************************************************
121 {
122  // do nothing because loss tables and range vectors are not used
123  return;
124 }