Gabriele Cosmo
56 lines
2.3 KiB
Plaintext
56 lines
2.3 KiB
Plaintext
//
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// ********************************************************************
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// * DISCLAIMER *
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// * *
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// * The following disclaimer summarizes all the specific disclaimers *
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// * of contributors to this software. The specific disclaimers,which *
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// * govern, are listed with their locations in: *
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// * http://cern.ch/geant4/license *
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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. *
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// * *
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// * This code implementation is the intellectual property of the *
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// * GEANT4 collaboration. *
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// * By copying, distributing or modifying the Program (or any work *
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// * based on the Program) you indicate your acceptance of this *
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// * statement, and all its terms. *
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// ********************************************************************
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//
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//
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// $Id: G4MagHelicalStepper.icc,v 1.7 2002/05/31 16:22:54 japost Exp $
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// GEANT4 tag $Name: geant4-05-00 $
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//
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// linear Step in regions of no field
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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[])
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{
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G4double momentum_val = 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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