Gabriele Cosmo
92 lines
3.6 KiB
C++
92 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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// ------------------------------------------------------------
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// GEANT 4 class implementation file
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// ------------------------------------------------------------
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//
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#include "G4ErrorMagFieldLimitProcess.hh"
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#include "G4ErrorMessenger.hh"
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#include "G4TransportationManager.hh"
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#include "G4FieldManager.hh"
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#include "G4Field.hh"
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#include "G4Track.hh"
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#ifdef G4VERBOSE
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# include "G4ErrorPropagatorData.hh"
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#endif
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//------------------------------------------------------------------------
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G4ErrorMagFieldLimitProcess::G4ErrorMagFieldLimitProcess(
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const G4String& processName)
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: G4VErrorLimitProcess(processName)
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{
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theStepLimit = kInfinity;
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}
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//------------------------------------------------------------------------
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G4ErrorMagFieldLimitProcess::~G4ErrorMagFieldLimitProcess() {}
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//------------------------------------------------------------------------
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G4double G4ErrorMagFieldLimitProcess::PostStepGetPhysicalInteractionLength(
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const G4Track& aTrack, G4double, G4ForceCondition* condition)
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{
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*condition = NotForced;
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const G4Field* field = G4TransportationManager::GetTransportationManager()
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->GetFieldManager()
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->GetDetectorField();
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theStepLength = kInfinity;
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if(field != 0)
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{
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G4ThreeVector trkPosi = aTrack.GetPosition();
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G4double pos1[3];
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pos1[0] = trkPosi.x();
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pos1[1] = trkPosi.y();
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pos1[2] = trkPosi.z();
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G4double h1[3];
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field->GetFieldValue(pos1, h1);
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G4ThreeVector BVec(h1[0], h1[1], h1[2]);
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G4double pmag = aTrack.GetMomentum().mag();
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G4double BPerpMom = BVec.cross(G4ThreeVector(pmag, 0., 0.)).mag() / pmag;
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theStepLength = theStepLimit * pmag / BPerpMom;
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#ifdef G4VERBOSE
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if(G4ErrorPropagatorData::verbose() >= 3)
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{
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G4cout << "G4ErrorMagFieldLimitProcess:: stepLength " << theStepLength
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<< " B " << BPerpMom << " BVec " << BVec << " pmag " << pmag
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<< G4endl;
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}
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#endif
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}
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return theStepLength;
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}
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