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28 // GEANT 4 class implementation file 28 // GEANT 4 class implementation file
29 // 29 //
30 // CERN, Geneva, Switzerland 30 // CERN, Geneva, Switzerland
31 // 31 //
32 // File name: G4KM_NucleonEqRhs.cc 32 // File name: G4KM_NucleonEqRhs.cc
33 // 33 //
34 // Author: Alessandro Brunengo (Al 34 // Author: Alessandro Brunengo (Alessandro.Brunengo@ge.infn.it)
35 // 35 //
36 // Creation date: 5 June 2000 36 // Creation date: 5 June 2000
37 // ------------------------------------------- 37 // -------------------------------------------------------------------
38 38
39 #include "G4KM_NucleonEqRhs.hh" 39 #include "G4KM_NucleonEqRhs.hh"
40 #include "G4VNuclearDensity.hh" 40 #include "G4VNuclearDensity.hh"
41 41
42 #include "G4PhysicalConstants.hh" 42 #include "G4PhysicalConstants.hh"
43 #include "G4Pow.hh" 43 #include "G4Pow.hh"
44 44
45 G4KM_NucleonEqRhs::G4KM_NucleonEqRhs(G4KM_Dumm 45 G4KM_NucleonEqRhs::G4KM_NucleonEqRhs(G4KM_DummyField *field,
46 G4V3DNucleus * nucleus) : 46 G4V3DNucleus * nucleus) :
47 G4Mag_EqRhs(field), theNucleus(nucleus) 47 G4Mag_EqRhs(field), theNucleus(nucleus)
48 { 48 {
49 theMass = 0.; 49 theMass = 0.;
50 A = theNucleus->GetMassNumber(); 50 A = theNucleus->GetMassNumber();
51 factor = hbarc*hbarc*G4Pow::GetInstance()->A 51 factor = hbarc*hbarc*G4Pow::GetInstance()->A23(3.*pi2*A)/3.;
52 } 52 }
53 53
54 54
55 void G4KM_NucleonEqRhs::EvaluateRhsGivenB(cons 55 void G4KM_NucleonEqRhs::EvaluateRhsGivenB(const G4double y[],
56 const G4double *, 56 const G4double *,
57 G4double dydx[]) const 57 G4double dydx[]) const
58 { 58 {
59 G4double yMod = std::sqrt(y[0]*y[0]+y[1]*y[1 59 G4double yMod = std::sqrt(y[0]*y[0]+y[1]*y[1]+y[2]*y[2]);
60 G4double e = std::sqrt(theMass*theMass+y[3]* 60 G4double e = std::sqrt(theMass*theMass+y[3]*y[3]+y[4]*y[4]+y[5]*y[5]);
61 61
62 // y[0..2] is position 62 // y[0..2] is position
63 // y[3..5] is momentum (and not mom.direction) 63 // y[3..5] is momentum (and not mom.direction)
64 64
65 dydx[0] = c_light*y[3]/e; // 65 dydx[0] = c_light*y[3]/e; //
66 dydx[1] = c_light*y[4]/e; // dq/dt=dH/dp 66 dydx[1] = c_light*y[4]/e; // dq/dt=dH/dp = c*p/e
67 dydx[2] = c_light*y[5]/e; // 67 dydx[2] = c_light*y[5]/e; //
68 68
69 /* 69 /*
70 * // debug 70 * // debug
71 * G4cout << " Nucleon RHS : 0..2(dpos/dt) " 71 * G4cout << " Nucleon RHS : 0..2(dpos/dt) " <<
72 * dydx[0] << " " << 72 * dydx[0] << " " <<
73 * dydx[1] << " " << 73 * dydx[1] << " " <<
74 * dydx[2] << " " << G4endl; 74 * dydx[2] << " " << G4endl;
75 */ 75 */
76 76
77 77
78 // V=K*rho(r) ==> dydx[3] = -dV/dr*dr/dx = -K* 78 // V=K*rho(r) ==> dydx[3] = -dV/dr*dr/dx = -K*d(rho)/dr*dr/dx.
79 // GF should be V=K*rho(r) ==> dydx[3] = -dV/d 79 // GF should be V=K*rho(r) ==> dydx[3] = -dV/dr*dr/dx = -K*d(rho)/dr*dr/dt
80 // GF and dV/dt = dE/dt ==> dp/dt = dE/dt * d 80 // GF and dV/dt = dE/dt ==> dp/dt = dE/dt * dp/dE = dE/dt *e/p
81 // Idem for dydx[4] and dydx[5] 81 // Idem for dydx[4] and dydx[5]
82 82
83 G4ThreeVector pos(y[0],y[1],y[2]); 83 G4ThreeVector pos(y[0],y[1],y[2]);
84 84
85 const G4VNuclearDensity * nuclearDensity=the 85 const G4VNuclearDensity * nuclearDensity=theNucleus->GetNuclearDensity();
86 86
87 // do not check for theMass != 0 : it is an er 87 // do not check for theMass != 0 : it is an error and core dump will signal it
88 88
89 G4double density= nuclearDensity->GetDensit 89 G4double density= nuclearDensity->GetDensity(pos);
90 G4double deriv(0); 90 G4double deriv(0);
91 if (density > 0 ) deriv = (factor/theMass)/ 91 if (density > 0 ) deriv = (factor/theMass)/
92 G4Pow::GetInstance()->A13(density)*nucle 92 G4Pow::GetInstance()->A13(density)*nuclearDensity->GetDeriv(pos);
93 93
94 // dydx[3] = yMod == 0 ? 0 : -deriv*y[0]/yMod 94 // dydx[3] = yMod == 0 ? 0 : -deriv*y[0]/yMod;
95 // dydx[4] = yMod == 0 ? 0 : -deriv*y[1]/yMod 95 // dydx[4] = yMod == 0 ? 0 : -deriv*y[1]/yMod;
96 // dydx[5] = yMod == 0 ? 0 : -deriv*y[2]/yMod 96 // dydx[5] = yMod == 0 ? 0 : -deriv*y[2]/yMod;
97 dydx[3] = yMod == 0 ? 0 : deriv*y[0]/yMod*c_ 97 dydx[3] = yMod == 0 ? 0 : deriv*y[0]/yMod*c_light;
98 dydx[4] = yMod == 0 ? 0 : deriv*y[1]/yMod*c_ 98 dydx[4] = yMod == 0 ? 0 : deriv*y[1]/yMod*c_light;
99 dydx[5] = yMod == 0 ? 0 : deriv*y[2]/yMod*c_ 99 dydx[5] = yMod == 0 ? 0 : deriv*y[2]/yMod*c_light;
100 100
101 101
102 /* 102 /*
103 * // debug 103 * // debug
104 * G4cout << " Nucleon RHS : 3..5(dE/dt) " << 104 * G4cout << " Nucleon RHS : 3..5(dE/dt) " <<
105 * dydx[3] << " " << 105 * dydx[3] << " " <<
106 * dydx[4] << " " << 106 * dydx[4] << " " <<
107 * dydx[5] << " " << G4endl; 107 * dydx[5] << " " << G4endl;
108 */ 108 */
109 } 109 }
110 110
111 // Here by design, but it is unnecessary for n 111 // Here by design, but it is unnecessary for nuclear fields
112 void G4KM_NucleonEqRhs::SetChargeMomentumMass( 112 void G4KM_NucleonEqRhs::SetChargeMomentumMass(G4ChargeState,G4double ,G4double )
113 { 113 {
114 } 114 }
115 115