[1274] | 1 | // |
---|
| 2 | // ******************************************************************** |
---|
| 3 | // * License and Disclaimer * |
---|
| 4 | // * * |
---|
| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
---|
| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
---|
| 7 | // * conditions of the Geant4 Software License, included in the file * |
---|
| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
---|
| 9 | // * include a list of copyright holders. * |
---|
| 10 | // * * |
---|
| 11 | // * Neither the authors of this software system, nor their employing * |
---|
| 12 | // * institutes,nor the agencies providing financial support for this * |
---|
| 13 | // * work make any representation or warranty, express or implied, * |
---|
| 14 | // * regarding this software system or assume any liability for its * |
---|
| 15 | // * use. Please see the license in the file LICENSE and URL above * |
---|
| 16 | // * for the full disclaimer and the limitation of liability. * |
---|
| 17 | // * * |
---|
| 18 | // * This code implementation is the result of the scientific and * |
---|
| 19 | // * technical work of the GEANT4 collaboration. * |
---|
| 20 | // * By using, copying, modifying or distributing the software (or * |
---|
| 21 | // * any work based on the software) you agree to acknowledge its * |
---|
| 22 | // * use in resulting scientific publications, and indicate your * |
---|
| 23 | // * acceptance of all terms of the Geant4 Software license. * |
---|
| 24 | // ******************************************************************** |
---|
| 25 | // |
---|
| 26 | // |
---|
| 27 | // $Id: G4MonopoleEq.cc,v 1.1 2009/11/17 09:53:03 grichine Exp $ |
---|
| 28 | // GEANT4 tag $Name: $ |
---|
| 29 | // |
---|
| 30 | // |
---|
| 31 | // This is the standard right-hand side for equation of motion. |
---|
| 32 | // |
---|
| 33 | // d(p_c)/ds=g{c-energyB_ - p_c x E}/pc |
---|
| 34 | // |
---|
| 35 | // The only case another is required is when using a moving reference |
---|
| 36 | // frame ... or extending the class to include additional Forces, |
---|
| 37 | // eg an electric field |
---|
| 38 | // |
---|
| 39 | // 17.11.09 V.Grichine |
---|
| 40 | // |
---|
| 41 | // ------------------------------------------------------------------- |
---|
| 42 | |
---|
| 43 | #include "G4MonopoleEq.hh" |
---|
| 44 | #include "globals.hh" |
---|
| 45 | |
---|
| 46 | void |
---|
| 47 | G4MonopoleEq::SetChargeMomentumMass(G4double particleCharge, // e+ units |
---|
| 48 | G4double, |
---|
| 49 | G4double particleMass) |
---|
| 50 | { |
---|
| 51 | fElectroMagCof = eplus*particleCharge; // no *c_light as for ususal q |
---|
| 52 | fElectroMagCof /= 2*fine_structure_const; |
---|
| 53 | |
---|
| 54 | fMassCof = particleMass*particleMass ; |
---|
| 55 | } |
---|
| 56 | |
---|
| 57 | |
---|
| 58 | |
---|
| 59 | void |
---|
| 60 | G4MonopoleEq::EvaluateRhsGivenB(const G4double y[], |
---|
| 61 | const G4double Field[], |
---|
| 62 | G4double dydx[] ) const |
---|
| 63 | { |
---|
| 64 | |
---|
| 65 | // Components of y: |
---|
| 66 | // 0-2 dr/ds, |
---|
| 67 | // 3-5 dpc/ds - momentum derivatives |
---|
| 68 | |
---|
| 69 | G4double pSquared = y[3]*y[3] + y[4]*y[4] + y[5]*y[5] ; |
---|
| 70 | |
---|
| 71 | G4double Energy = std::sqrt( pSquared + fMassCof ); |
---|
| 72 | G4double cof2 = Energy*c_light ; |
---|
| 73 | |
---|
| 74 | G4double pModuleInverse = 1.0/std::sqrt(pSquared) ; |
---|
| 75 | |
---|
| 76 | // G4double inverse_velocity = Energy * c_light * pModuleInverse; |
---|
| 77 | G4double inverse_velocity = Energy * pModuleInverse / c_light; |
---|
| 78 | |
---|
| 79 | G4double cof1 = fElectroMagCof*pModuleInverse ; |
---|
| 80 | |
---|
| 81 | // G4double vDotE = y[3]*Field[3] + y[4]*Field[4] + y[5]*Field[5] ; |
---|
| 82 | |
---|
| 83 | |
---|
| 84 | dydx[0] = y[3]*pModuleInverse ; |
---|
| 85 | dydx[1] = y[4]*pModuleInverse ; |
---|
| 86 | dydx[2] = y[5]*pModuleInverse ; |
---|
| 87 | |
---|
| 88 | dydx[3] = cof1*(cof2*Field[0] - (y[4]*Field[5] - y[5]*Field[4])) ; |
---|
| 89 | |
---|
| 90 | dydx[4] = cof1*(cof2*Field[1] - (y[5]*Field[3] - y[3]*Field[5])) ; |
---|
| 91 | |
---|
| 92 | dydx[5] = cof1*(cof2*Field[2] - (y[3]*Field[4] - y[4]*Field[3])) ; |
---|
| 93 | |
---|
| 94 | dydx[6] = 0.;//not used |
---|
| 95 | |
---|
| 96 | // Lab Time of flight |
---|
| 97 | dydx[7] = inverse_velocity; |
---|
| 98 | return ; |
---|
| 99 | } |
---|