1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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7 | // * conditions of the Geant4 Software License, included in the file * |
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8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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9 | // * include a list of copyright holders. * |
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10 | // * * |
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11 | // * Neither the authors of this software system, nor their employing * |
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12 | // * institutes,nor the agencies providing financial support for this * |
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13 | // * work make any representation or warranty, express or implied, * |
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14 | // * regarding this software system or assume any liability for its * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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16 | // * for the full disclaimer and the limitation of liability. * |
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17 | // * * |
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18 | // * This code implementation is the result of the scientific and * |
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19 | // * technical work of the GEANT4 collaboration. * |
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20 | // * By using, copying, modifying or distributing the software (or * |
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21 | // * any work based on the software) you agree to acknowledge its * |
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22 | // * use in resulting scientific publications, and indicate your * |
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23 | // * acceptance of all terms of the Geant4 Software license. * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // |
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27 | // $Id: G4HarmonicPolMagField.cc,v 1.6 2006/06/29 18:24:00 gunter Exp $ |
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28 | // GEANT4 tag $Name: $ |
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29 | // |
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30 | // ------------------------------------------------------------------- |
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31 | |
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32 | #include "G4HarmonicPolMagField.hh" |
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33 | #include "globals.hh" |
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34 | |
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35 | G4HarmonicPolMagField::G4HarmonicPolMagField() |
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36 | { |
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37 | } |
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38 | |
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39 | ///////////////////////////////////////////////////////////////////////// |
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40 | |
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41 | G4HarmonicPolMagField::~G4HarmonicPolMagField() |
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42 | { |
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43 | } |
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44 | |
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45 | ///////////////////////////////////////////////////////////////////////// |
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46 | |
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47 | |
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48 | void G4HarmonicPolMagField::GetFieldValue(const G4double yTrack[7], |
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49 | G4double B[3] ) const |
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50 | { |
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51 | G4int i ; |
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52 | G4double a = 1.00 ; // mm -> m |
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53 | G4double x = a*yTrack[0], y = a*yTrack[1], z = a*yTrack[2] ; |
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54 | G4double x2 = x*x, y2 = y*y, z2 = z*z ; |
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55 | G4double x3 = x2*x, y3 = y2*y, z3 = z2*z ; |
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56 | G4double xy = x*y, xz = x*z, yz = y*z, xyz = x*y*z ; |
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57 | static G4double |
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58 | c[24] = { |
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59 | .010, .010, .010, // 3(0) |
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60 | .0001, .0001, .0001, .0001, .0001, // 5(1) |
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61 | .00001, .00001, .00001, .00001, .00001, .00001, .00001, // 7(2) |
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62 | .000001, .000001, .000001, .000001, .000001, .000001, |
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63 | .0000001, .0000001, .0000001 // 9(3) |
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64 | } ; // total : 24 |
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65 | |
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66 | // for(i=0;i<24;i++) |
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67 | // { |
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68 | // c[i] = 1.0*c[i] ; |
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69 | // } |
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70 | B[0] = c[1] |
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71 | -2*c[3]*x + c[4]*z +c[6]*y -2*c[7]*x |
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72 | -6*c[8]*xz + c[9]*(z2-x2) -2*c[10]*xy + c[11]*yz - 2*c[12]*xz |
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73 | +c[13]*(y2-x2) - 6*c[14]*xy |
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74 | -4*c[15]*(3*x*z2-x3) +c[16]*(z3-3*x2*z) - 6*c[17]*xyz +c[18]*y*(z2-x2) |
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75 | -2*c[19]*(x*z2+x*y2-2*x3/3) + c[20]*z*(y2-x2) - 6*c[21]*xyz |
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76 | +c[22]*(y3-3*x2*y) - 4*c[23]*(3*x*y2-x3) ; |
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77 | |
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78 | B[1] = c[2] |
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79 | +c[5]*z + c[6]*x + 2*c[7]*y |
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80 | +c[10]*(z2-x2) + c[11]*xz +2*c[12]*yz +2*c[13]*xy + 3*c[14]*(y2-x2) |
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81 | +c[17]*(z3-3*x2*z) + c[18]*(x*z2-x3/3) +2*c[19]*y*(z2-x2) |
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82 | +2*c[20]*xyz |
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83 | +3*c[21]*z*(y2-x2) + c[22]*(3*x*y2-x3) + 4*c[23]*(y3-3*x2*y) ; |
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84 | |
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85 | B[2] = c[0] |
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86 | +c[3]*z + c[4]*x + c[5]*y |
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87 | +3*c[8]*(z2-x2) + 2*c[9]*xz + 2*c[10]*yz + c[11]*xy + c[12]*(y2-x2) |
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88 | +4*c[15]*(z3-3*x2*z) + c[16]*(3*x*z2-x3) + 3*c[17]*(y*z2-x2*y) |
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89 | +2*c[18]*xyz |
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90 | +2*c[19]*z*(y2-x2) + c[20]*(x*y2-x3/3) + c[21]*(y3-3*x2*y) ; |
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91 | for(i=0;i<3;i++) |
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92 | { |
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93 | B[i] = 0.1*B[i] ; |
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94 | } |
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95 | } |
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96 | |
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97 | // ----------------------------------------------------------------- |
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