| Geant4 Cross Reference |
1 // 1 //
2 // ******************************************* 2 // ********************************************************************
3 // * License and Disclaimer 3 // * License and Disclaimer *
4 // * 4 // * *
5 // * The Geant4 software is copyright of th 5 // * The Geant4 software is copyright of the Copyright Holders of *
6 // * the Geant4 Collaboration. It is provided 6 // * the Geant4 Collaboration. It is provided under the terms and *
7 // * conditions of the Geant4 Software License 7 // * conditions of the Geant4 Software License, included in the file *
8 // * LICENSE and available at http://cern.ch/ 8 // * LICENSE and available at http://cern.ch/geant4/license . These *
9 // * include a list of copyright holders. 9 // * include a list of copyright holders. *
10 // * 10 // * *
11 // * Neither the authors of this software syst 11 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing fin 12 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warran 13 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assum 14 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file 15 // * use. Please see the license in the file LICENSE and URL above *
16 // * for the full disclaimer and the limitatio 16 // * for the full disclaimer and the limitation of liability. *
17 // * 17 // * *
18 // * This code implementation is the result 18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboratio 19 // * technical work of the GEANT4 collaboration. *
20 // * By using, copying, modifying or distri 20 // * By using, copying, modifying or distributing the software (or *
21 // * any work based on the software) you ag 21 // * any work based on the software) you agree to acknowledge its *
22 // * use in resulting scientific publicati 22 // * use in resulting scientific publications, and indicate your *
23 // * acceptance of all terms of the Geant4 Sof 23 // * acceptance of all terms of the Geant4 Software license. *
24 // ******************************************* 24 // ********************************************************************
25 // 25 //
26 // G4EqMagElectricField implementation <<
27 // 26 //
28 // This is the standard right-hand side for eq << 27 // $Id: G4EqMagElectricField.cc 69699 2013-05-13 08:50:30Z gcosmo $
29 // 28 //
30 // The only case another is required is when u <<
31 // frame ... or extending the class to include <<
32 // e.g., an electric field <<
33 // 29 //
34 // Created: V.Grichine, 10.11.1998 << 30 // This is the standard right-hand side for equation of motion.
>> 31 //
>> 32 // The only case another is required is when using a moving reference
>> 33 // frame ... or extending the class to include additional Forces,
>> 34 // eg an electric field
>> 35 //
>> 36 // 10.11.98 V.Grichine
>> 37 //
35 // ------------------------------------------- 38 // -------------------------------------------------------------------
36 39
37 #include "G4EqMagElectricField.hh" 40 #include "G4EqMagElectricField.hh"
38 #include "globals.hh" 41 #include "globals.hh"
39 #include "G4PhysicalConstants.hh" 42 #include "G4PhysicalConstants.hh"
40 #include "G4SystemOfUnits.hh" 43 #include "G4SystemOfUnits.hh"
41 44
42 G4EqMagElectricField::G4EqMagElectricField(G4E <<
43 : G4EquationOfMotion( emField ) <<
44 { <<
45 } <<
46 <<
47 G4EqMagElectricField::~G4EqMagElectricField() <<
48 <<
49 void 45 void
50 G4EqMagElectricField::SetChargeMomentumMass(G4 46 G4EqMagElectricField::SetChargeMomentumMass(G4ChargeState particleCharge,
51 G4 << 47 G4double,
52 G4 48 G4double particleMass)
53 { 49 {
54 G4double pcharge = particleCharge.GetCharge 50 G4double pcharge = particleCharge.GetCharge();
55 fElectroMagCof = eplus*pcharge*c_light ; 51 fElectroMagCof = eplus*pcharge*c_light ;
56 fMassCof = particleMass*particleMass ; 52 fMassCof = particleMass*particleMass ;
57 } 53 }
58 54
>> 55
>> 56
59 void 57 void
60 G4EqMagElectricField::EvaluateRhsGivenB(const 58 G4EqMagElectricField::EvaluateRhsGivenB(const G4double y[],
61 const << 59 const G4double Field[],
62 << 60 G4double dydx[] ) const
63 { 61 {
>> 62
64 // Components of y: 63 // Components of y:
65 // 0-2 dr/ds, 64 // 0-2 dr/ds,
66 // 3-5 dp/ds - momentum derivatives 65 // 3-5 dp/ds - momentum derivatives
67 66
68 G4double pSquared = y[3]*y[3] + y[4]*y[4] + 67 G4double pSquared = y[3]*y[3] + y[4]*y[4] + y[5]*y[5] ;
69 68
70 G4double Energy = std::sqrt( pSquared + f 69 G4double Energy = std::sqrt( pSquared + fMassCof );
71 G4double cof2 = Energy/c_light ; 70 G4double cof2 = Energy/c_light ;
72 71
73 G4double pModuleInverse = 1.0/std::sqrt(pS 72 G4double pModuleInverse = 1.0/std::sqrt(pSquared) ;
74 73
>> 74 // G4double inverse_velocity = Energy * c_light * pModuleInverse;
75 G4double inverse_velocity = Energy * pModul 75 G4double inverse_velocity = Energy * pModuleInverse / c_light;
76 76
77 G4double cof1 = fElectroMagCof*pModuleI 77 G4double cof1 = fElectroMagCof*pModuleInverse ;
78 78
>> 79 // G4double vDotE = y[3]*Field[3] + y[4]*Field[4] + y[5]*Field[5] ;
>> 80
>> 81
79 dydx[0] = y[3]*pModuleInverse ; 82 dydx[0] = y[3]*pModuleInverse ;
80 dydx[1] = y[4]*pModuleInverse ; 83 dydx[1] = y[4]*pModuleInverse ;
81 dydx[2] = y[5]*pModuleInverse ; 84 dydx[2] = y[5]*pModuleInverse ;
82 85
83 dydx[3] = cof1*(cof2*Field[3] + (y[4]*Field 86 dydx[3] = cof1*(cof2*Field[3] + (y[4]*Field[2] - y[5]*Field[1])) ;
84 87
85 dydx[4] = cof1*(cof2*Field[4] + (y[5]*Field 88 dydx[4] = cof1*(cof2*Field[4] + (y[5]*Field[0] - y[3]*Field[2])) ;
86 89
87 dydx[5] = cof1*(cof2*Field[5] + (y[3]*Field 90 dydx[5] = cof1*(cof2*Field[5] + (y[3]*Field[1] - y[4]*Field[0])) ;
88 91
89 dydx[6] = 0.;//not used 92 dydx[6] = 0.;//not used
90 93
91 // Lab Time of flight 94 // Lab Time of flight
92 // <<
93 dydx[7] = inverse_velocity; 95 dydx[7] = inverse_velocity;
94 << 96 return ;
95 return; <<
96 } 97 }
97 98