Gabriele Cosmo
133 lines
4.3 KiB
C++
133 lines
4.3 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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/// \file field/field05/src/F05Field.cc
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/// \brief Implementation of the F05Field class
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//
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//
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//
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//
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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#include "F05Field.hh"
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#include "G4FieldManager.hh"
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#include "G4TransportationManager.hh"
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#include "G4EqEMFieldWithSpin.hh"
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#include "G4ChordFinder.hh"
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#include "G4PropagatorInField.hh"
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#include "G4MagIntegratorStepper.hh"
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#include "G4ClassicalRK4.hh"
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#include "G4SystemOfUnits.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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F05Field::F05Field() : G4ElectroMagneticField()
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{
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fEquation = new G4EqEMFieldWithSpin(this);
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G4FieldManager* fieldMgr
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= G4TransportationManager::GetTransportationManager()->GetFieldManager();
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fieldMgr->SetDetectorField(this);
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fStepper = new G4ClassicalRK4(fEquation,12);
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G4double minStep = 0.01*mm;
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fChordFinder = new G4ChordFinder((G4MagneticField*)this,minStep,fStepper);
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// Set accuracy parameters
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G4double deltaChord = 3.0*mm;
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fChordFinder->SetDeltaChord( deltaChord );
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G4double deltaOneStep = 0.01*mm;
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fieldMgr->SetAccuraciesWithDeltaOneStep(deltaOneStep);
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G4double deltaIntersection = 0.1*mm;
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fieldMgr->SetDeltaIntersection(deltaIntersection);
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G4TransportationManager* fTransportManager =
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G4TransportationManager::GetTransportationManager();
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fieldPropagator = fTransportManager->GetPropagatorInField();
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G4double epsMin = 2.5e-7*mm;
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G4double epsMax = 0.05*mm;
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fieldPropagator->SetMinimumEpsilonStep(epsMin);
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fieldPropagator->SetMaximumEpsilonStep(epsMax);
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fieldMgr->SetChordFinder(fChordFinder);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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F05Field::~F05Field()
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{
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if (fEquation) delete fEquation;
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if (fStepper) delete fStepper;
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if (fChordFinder) delete fChordFinder;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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void F05Field::GetFieldValue( const G4double Point[3],G4double* Bfield ) const
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{
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// Point[0],Point[1],Point[2] are x-, y-, z-cordinates
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const G4double Bz = 0.24*tesla;
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const G4double Er = 2.113987E+6*volt/m;
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G4double Ex,Ey;
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G4double posR = std::sqrt(std::pow(Point[0],2) + std::pow(Point[1],2));
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G4double cos_theta, sin_theta;
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if (posR>0){
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cos_theta = Point[0]/(G4double)posR;
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sin_theta = Point[1]/(G4double)posR;
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Ex = -1*Er*cos_theta;//apply radial electric field
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Ey = -1*Er*sin_theta;
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}else{
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Ex=0;
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Ey=0;
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}
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Bfield[0]=0;
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Bfield[1]=0;
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Bfield[2]=Bz;
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Bfield[3]=Ex;
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Bfield[4]=Ey;
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Bfield[5]=0;
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return;
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}
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