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