Gabriele Cosmo
60 lines
2.7 KiB
Plaintext
60 lines
2.7 KiB
Plaintext
//
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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: G4MagHelicalStepper.icc,v 1.11 2006/06/29 18:22:56 gunter Exp $
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// GEANT4 tag $Name: geant4-08-01 $
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//
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// Linear Step in regions of no field
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//
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// --------------------------------------------------------------------
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inline void
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G4MagHelicalStepper::LinearStep( const G4double yIn[],
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G4double h,
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G4double yLinear[]) const
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{
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G4double momentum_val = std::sqrt(yIn[3]*yIn[3] + yIn[4]*yIn[4] + yIn[5]*yIn[5]) ;
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G4double inv_momentum = 1.0 / momentum_val ;
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G4double yDir[3];
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// G4double h_div_momentum = 1.0 / momentum_val ;
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for( G4int i = 0; i < 3; i++ ) {
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yDir[i] = inv_momentum * yIn[i+3];
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yLinear[i] = yIn[i] + h * yDir[i];
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// yLinear[i] = yIn[i] + h_div_momentum * yIn[i+3];
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yLinear[i+3] = yIn[i+3];
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}
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}
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inline void
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G4MagHelicalStepper::MagFieldEvaluate(const G4double y[],
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G4ThreeVector& Bfield )
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{
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G4double B[3];
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GetEquationOfMotion()-> GetFieldValue(y, B);
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Bfield= G4ThreeVector( B[0], B[1], B[2] );
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}
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