Gabriele Cosmo
97 lines
3.7 KiB
C++
97 lines
3.7 KiB
C++
//
|
|
// ********************************************************************
|
|
// * License and Disclaimer *
|
|
// * *
|
|
// * The Geant4 software is copyright of the Copyright Holders of *
|
|
// * the Geant4 Collaboration. It is provided under the terms and *
|
|
// * conditions of the Geant4 Software License, included in the file *
|
|
// * LICENSE and available at http://cern.ch/geant4/license . These *
|
|
// * include a list of copyright holders. *
|
|
// * *
|
|
// * Neither the authors of this software system, nor their employing *
|
|
// * institutes,nor the agencies providing financial support for this *
|
|
// * work make any representation or warranty, express or implied, *
|
|
// * regarding this software system or assume any liability for its *
|
|
// * use. Please see the license in the file LICENSE and URL above *
|
|
// * for the full disclaimer and the limitation of liability. *
|
|
// * *
|
|
// * This code implementation is the result of the scientific and *
|
|
// * technical work of the GEANT4 collaboration. *
|
|
// * By using, copying, modifying or distributing the software (or *
|
|
// * any work based on the software) you agree to acknowledge its *
|
|
// * use in resulting scientific publications, and indicate your *
|
|
// * acceptance of all terms of the Geant4 Software license. *
|
|
// ********************************************************************
|
|
//
|
|
// $Id: G4ExactHelixStepper.hh,v 1.5 2007/05/18 12:50:31 tnikitin Exp $
|
|
// GEANT4 tag $Name: geant4-09-01 $
|
|
//
|
|
//
|
|
// class G4ExactHelixStepper
|
|
// -------------------
|
|
// Class description:
|
|
//
|
|
// Concrete class for particle motion in constant magnetic field.
|
|
|
|
// History:
|
|
// - 28.Jan.05 J.Apostolakis Creation of new concrete class
|
|
// --------------------------------------------------------------------
|
|
|
|
#ifndef G4ExactHelixStepper_hh
|
|
#define G4ExactHelixStepper_hh
|
|
|
|
#include "G4Types.hh"
|
|
#include "G4ThreeVector.hh"
|
|
|
|
#include "G4MagIntegratorStepper.hh"
|
|
#include "G4MagHelicalStepper.hh"
|
|
#include "G4Mag_EqRhs.hh"
|
|
|
|
class G4ExactHelixStepper : public G4MagHelicalStepper
|
|
{
|
|
public: // with description
|
|
|
|
G4ExactHelixStepper(G4Mag_EqRhs *EqRhs);
|
|
~G4ExactHelixStepper();
|
|
|
|
void Stepper( const G4double y[],
|
|
const G4double dydx[],
|
|
G4double h,
|
|
G4double yout[],
|
|
G4double yerr[] );
|
|
// Step 'integration' for step size 'h'
|
|
// Provides helix starting at y[0 to 6]
|
|
// Outputs yout[] and ZERO estimated error yerr[]=0.
|
|
|
|
void DumbStepper( const G4double y[],
|
|
G4ThreeVector Bfld,
|
|
G4double h,
|
|
G4double yout[] );
|
|
// Performs a 'dump' Step without error calculation.
|
|
|
|
G4double DistChord() const;
|
|
// Estimate maximum distance of curved solution and chord ...
|
|
|
|
virtual G4int IntegratorOrder() const;
|
|
|
|
private:
|
|
|
|
G4ExactHelixStepper(const G4ExactHelixStepper&);
|
|
G4ExactHelixStepper& operator=(const G4ExactHelixStepper&);
|
|
// Private copy constructor and assignment operator.
|
|
|
|
private:
|
|
G4ThreeVector fBfieldValue; // Initial value of field at last step
|
|
G4ThreeVector yInitialEHS, yFinalEHS;
|
|
G4ThreeVector pInitial;
|
|
G4double fLastStepSize; // Length of last step
|
|
G4double fYInSav[7]; // Starting state of x, p, ...
|
|
// Values saved for calculating mid-point for chord
|
|
|
|
G4Mag_EqRhs* fPtrMagEqOfMot;
|
|
};
|
|
|
|
|
|
|
|
#endif /* G4ExactHelixStepper_hh */
|