| [831] | 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: G4MagHelicalStepper.icc,v 1.13 2007/05/18 15:45:15 tnikitin Exp $
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| [921] | 28 | // GEANT4 tag $Name: geant4-09-02-cand-01 $
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| [831] | 29 | //
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| 30 | // Linear Step in regions of no field
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| 31 | //
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| 32 | // --------------------------------------------------------------------
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| 33 |
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| 34 | inline void
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| 35 | G4MagHelicalStepper::LinearStep( const G4double yIn[],
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| 36 | G4double h,
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| 37 | G4double yLinear[]) const
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| 38 | {
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| 39 | G4double momentum_val = std::sqrt(yIn[3]*yIn[3] + yIn[4]*yIn[4] + yIn[5]*yIn[5]) ;
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| 40 | G4double inv_momentum = 1.0 / momentum_val ;
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| 41 | G4double yDir[3];
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| 42 | // G4double h_div_momentum = 1.0 / momentum_val ;
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| 43 |
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| 44 | for( G4int i = 0; i < 3; i++ ) {
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| 45 | yDir[i] = inv_momentum * yIn[i+3];
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| 46 | yLinear[i] = yIn[i] + h * yDir[i];
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| 47 | // yLinear[i] = yIn[i] + h_div_momentum * yIn[i+3];
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| 48 | yLinear[i+3] = yIn[i+3];
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| 49 | }
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| 50 | }
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| 51 |
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| 52 | inline void
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| 53 | G4MagHelicalStepper::MagFieldEvaluate(const G4double y[],
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| 54 | G4ThreeVector& Bfield )
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| 55 | {
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| 56 | G4double B[3];
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| 57 | GetEquationOfMotion()-> GetFieldValue(y, B);
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| 58 | Bfield= G4ThreeVector( B[0], B[1], B[2] );
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| 59 | }
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| 60 |
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| 61 | inline G4double
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| 62 | G4MagHelicalStepper::GetInverseCurve(const G4double Momentum,
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| 63 | const G4double Bmag)
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| 64 | {
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| 65 |
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| 66 | G4double inv_momentum = 1.0 / Momentum ;
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| 67 | G4double particleCharge = fPtrMagEqOfMot->FCof() / (eplus*c_light);
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| 68 | G4double fCoefficient = -fUnitConstant * particleCharge*inv_momentum;
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| 69 |
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| 70 | return fCoefficient*Bmag;
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| 71 | }
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| 72 | inline void G4MagHelicalStepper:: SetAngCurve(const G4double Ang)
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| 73 | {
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| 74 | fAngCurve=Ang;
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| 75 |
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| 76 | }
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| 77 |
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| 78 | inline G4double G4MagHelicalStepper:: GetAngCurve() const
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| 79 | {
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| 80 | return fAngCurve;
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| 81 |
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| 82 | }
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| 83 |
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| 84 | inline void G4MagHelicalStepper:: SetCurve(const G4double Curve)
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| 85 | {
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| 86 | frCurve=Curve;
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| 87 | }
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| 88 |
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| 89 | inline G4double G4MagHelicalStepper:: GetCurve() const
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| 90 | {
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| 91 | return frCurve;
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| 92 |
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| 93 | }
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| 94 |
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| 95 | inline void G4MagHelicalStepper:: SetRadHelix(const G4double Rad)
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| 96 | {
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| 97 | frHelix=Rad;
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| 98 | }
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| 99 |
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| 100 | inline G4double G4MagHelicalStepper:: GetRadHelix() const
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| 101 | {
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| 102 | return frHelix;
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| 103 |
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| 104 | }
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| 105 |
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| 106 |
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| 107 |
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| 108 |
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