Gabriele Cosmo
101 lines
4.2 KiB
C++
101 lines
4.2 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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//
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// $Id: G4HarmonicPolMagField.cc 68055 2013-03-13 14:43:28Z gcosmo $
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//
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// -------------------------------------------------------------------
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#include "G4HarmonicPolMagField.hh"
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#include "globals.hh"
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G4HarmonicPolMagField::G4HarmonicPolMagField()
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{
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}
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G4HarmonicPolMagField* G4HarmonicPolMagField::Clone() const
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{
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return new G4HarmonicPolMagField;
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}
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/////////////////////////////////////////////////////////////////////////
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G4HarmonicPolMagField::~G4HarmonicPolMagField()
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{
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}
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/////////////////////////////////////////////////////////////////////////
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void G4HarmonicPolMagField::GetFieldValue(const G4double yTrack[7],
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G4double B[3] ) const
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{
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G4int i ;
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G4double a = 1.00 ; // mm -> m
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G4double x = a*yTrack[0], y = a*yTrack[1], z = a*yTrack[2] ;
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G4double x2 = x*x, y2 = y*y, z2 = z*z ;
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G4double x3 = x2*x, y3 = y2*y, z3 = z2*z ;
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G4double xy = x*y, xz = x*z, yz = y*z, xyz = x*y*z ;
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static G4ThreadLocal G4double
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c[24] = {
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.010, .010, .010, // 3(0)
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.0001, .0001, .0001, .0001, .0001, // 5(1)
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.00001, .00001, .00001, .00001, .00001, .00001, .00001, // 7(2)
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.000001, .000001, .000001, .000001, .000001, .000001,
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.0000001, .0000001, .0000001 // 9(3)
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} ; // total : 24
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// for(i=0;i<24;i++)
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// {
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// c[i] = 1.0*c[i] ;
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// }
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B[0] = c[1]
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-2*c[3]*x + c[4]*z +c[6]*y -2*c[7]*x
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-6*c[8]*xz + c[9]*(z2-x2) -2*c[10]*xy + c[11]*yz - 2*c[12]*xz
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+c[13]*(y2-x2) - 6*c[14]*xy
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-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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-2*c[19]*(x*z2+x*y2-2*x3/3) + c[20]*z*(y2-x2) - 6*c[21]*xyz
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+c[22]*(y3-3*x2*y) - 4*c[23]*(3*x*y2-x3) ;
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B[1] = c[2]
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+c[5]*z + c[6]*x + 2*c[7]*y
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+c[10]*(z2-x2) + c[11]*xz +2*c[12]*yz +2*c[13]*xy + 3*c[14]*(y2-x2)
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+c[17]*(z3-3*x2*z) + c[18]*(x*z2-x3/3) +2*c[19]*y*(z2-x2)
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+2*c[20]*xyz
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+3*c[21]*z*(y2-x2) + c[22]*(3*x*y2-x3) + 4*c[23]*(y3-3*x2*y) ;
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B[2] = c[0]
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+c[3]*z + c[4]*x + c[5]*y
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+3*c[8]*(z2-x2) + 2*c[9]*xz + 2*c[10]*yz + c[11]*xy + c[12]*(y2-x2)
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+4*c[15]*(z3-3*x2*z) + c[16]*(3*x*z2-x3) + 3*c[17]*(y*z2-x2*y)
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+2*c[18]*xyz
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+2*c[19]*z*(y2-x2) + c[20]*(x*y2-x3/3) + c[21]*(y3-3*x2*y) ;
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for(i=0;i<3;i++)
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{
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B[i] = 0.1*B[i] ;
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}
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}
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// -----------------------------------------------------------------
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