Gabriele Cosmo
97 lines
3.6 KiB
C++
97 lines
3.6 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: G4QuadrupoleMagField.cc 96751 2016-05-04 09:39:38Z gcosmo $
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//
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// -------------------------------------------------------------------
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#include "G4QuadrupoleMagField.hh"
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#include "G4RotationMatrix.hh"
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static G4RotationMatrix IdentityMatrix;
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G4QuadrupoleMagField::G4QuadrupoleMagField(G4double pGradient)
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{
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fGradient = pGradient ;
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fOrigin = G4ThreeVector( 0.0, 0.0, 0.0) ;
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fpMatrix = &IdentityMatrix;
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}
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/////////////////////////////////////////////////////////////////////////
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G4QuadrupoleMagField::G4QuadrupoleMagField(G4double pGradient,
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G4ThreeVector pOrigin,
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G4RotationMatrix* pMatrix)
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{
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fGradient = pGradient ;
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fOrigin = pOrigin ;
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fpMatrix = pMatrix ;
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}
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G4Field* G4QuadrupoleMagField::Clone() const
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{
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return new G4QuadrupoleMagField(fGradient, fOrigin, fpMatrix);
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}
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/////////////////////////////////////////////////////////////////////////
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G4QuadrupoleMagField::~G4QuadrupoleMagField()
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{
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}
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////////////////////////////////////////////////////////////////////////
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// Allow displaced origin and rotation
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// Extensions by Björn Riese (GSI)
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void G4QuadrupoleMagField::GetFieldValue( const G4double y[7],
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G4double B[3] ) const
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{
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G4ThreeVector r_global = G4ThreeVector(
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y[0] - fOrigin.x(),
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y[1] - fOrigin.y(),
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y[2] - fOrigin.z());
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G4ThreeVector r_local = G4ThreeVector(
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fpMatrix->colX() * r_global,
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fpMatrix->colY() * r_global,
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fpMatrix->colZ() * r_global);
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G4ThreeVector B_local = G4ThreeVector(
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fGradient * r_local.y(),
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fGradient * r_local.x(),
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0);
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G4ThreeVector B_global = G4ThreeVector(
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fpMatrix->inverse().rowX() * B_local,
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fpMatrix->inverse().rowY() * B_local,
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fpMatrix->inverse().rowZ() * B_local);
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B[0] = B_global.x() ;
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B[1] = B_global.y() ;
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B[2] = B_global.z() ;
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}
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