[1199] | 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 1.3 2006/06/29 18:26:56 gunter Exp $ |
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[1347] | 28 | // GEANT4 tag $Name: geant4-09-04-ref-00 $ |
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[1199] | 29 | // |
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| 30 | |
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| 31 | #include "G4HarmonicPolMagField.hh" |
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| 32 | #include "globals.hh" |
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| 33 | #include "geomdefs.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 | |
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| 42 | G4HarmonicPolMagField::~G4HarmonicPolMagField() |
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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 | |
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| 49 | |
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| 50 | void |
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| 51 | G4HarmonicPolMagField::GetFieldValue (const G4double yTrack[3], |
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| 52 | G4double *B ) const |
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| 53 | { |
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| 54 | G4int i ; |
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| 55 | G4double a = 1.00 ; // mm -> m |
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| 56 | G4double a2 = a*a, a3 = a2*a, a4 = a2*a2, a5 = a3*a2 ; |
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| 57 | G4double x = a*yTrack[0], y = a*yTrack[1], z = a*yTrack[2] ; |
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| 58 | G4double x2 = x*x, y2 = y*y, z2 = z*z ; |
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| 59 | G4double x3 = x2*x, y3 = y2*y, z3 = z2*z ; |
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| 60 | G4double xy = x*y, xz = x*z, yz = y*z, xyz = x*y*z ; |
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| 61 | static G4double |
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| 62 | c[24] = { |
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| 63 | 0.010, 0.010, 0.010, // 3(0) |
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| 64 | 0.0001, 0.0001, 0.0001, 0.0001, 0.0001, // 5(1) |
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| 65 | 0.00001, 0.00001, 0.00001, 0.00001, 0.00001, 0.00001, 0.00001, // 7(2) |
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| 66 | 0.000001, 0.000001, 0.000001, 0.000001, 0.000001, 0.000001, |
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| 67 | 0.0000001, 0.0000001, 0.0000001 // 9(3) |
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| 68 | } ; // total : 24 |
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| 69 | |
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| 70 | // for(i=0;i<24;i++) |
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| 71 | // { |
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| 72 | // c[i] = 1.0*c[i] ; |
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| 73 | // } |
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| 74 | B[0] = c[1] |
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| 75 | -2*c[3]*x + c[4]*z +c[6]*y -2*c[7]*x |
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| 76 | -6*c[8]*xz + c[9]*(z2-x2) -2*c[10]*xy + c[11]*yz - 2*c[12]*xz |
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| 77 | +c[13]*(y2-x2) - 6*c[14]*xy |
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| 78 | -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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| 79 | -2*c[19]*(x*z2+x*y2-2*x3/3) + c[20]*z*(y2-x2) - 6*c[21]*xyz |
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| 80 | +c[22]*(y3-3*x2*y) - 4*c[23]*(3*x*y2-x3) ; |
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| 81 | |
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| 82 | B[1] = c[2] |
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| 83 | +c[5]*z + c[6]*x + 2*c[7]*y |
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| 84 | +c[10]*(z2-x2) + c[11]*xz +2*c[12]*yz +2*c[13]*xy + 3*c[14]*(y2-x2) |
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| 85 | +c[17]*(z3-3*x2*z) + c[18]*(x*z2-x3/3) +2*c[19]*y*(z2-x2) |
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| 86 | +2*c[20]*xyz |
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| 87 | +3*c[21]*z*(y2-x2) + c[22]*(3*x*y2-x3) + 4*c[23]*(y3-3*x2*y) ; |
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| 88 | |
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| 89 | B[2] = c[0] |
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| 90 | +c[3]*z + c[4]*x + c[5]*y |
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| 91 | +3*c[8]*(z2-x2) + 2*c[9]*xz + 2*c[10]*yz + c[11]*xy + c[12]*(y2-x2) |
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| 92 | +4*c[15]*(z3-3*x2*z) + c[16]*(3*x*z2-x3) + 3*c[17]*(y*z2-x2*y) |
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| 93 | +2*c[18]*xyz |
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| 94 | +2*c[19]*z*(y2-x2) + c[20]*(x*y2-x3/3) + c[21]*(y3-3*x2*y) ; |
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| 95 | for(i=0;i<3;i++) |
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| 96 | { |
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| 97 | B[i] = 0.1*B[i] ; |
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| 98 | } |
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| 99 | |
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| 100 | return ; |
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| 101 | } |
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| 102 | |
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| 103 | // ----------------------------------------------------------------- |
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| 104 | |
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