Gabriele Cosmo
106 lines
3.7 KiB
C++
106 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. *
|
|
// ********************************************************************
|
|
//
|
|
// G4SimpleHeum
|
|
//
|
|
// Class description:
|
|
//
|
|
// Simple Heum stepper for magnetic field:
|
|
// x_1 = x_0 +
|
|
// h * 1/4 * dx(t0,x0) +
|
|
// 3/4 * dx(t0+2/3*h, x0+2/3*h*(dx(t0+h/3,x0+h/3*dx(t0,x0))))
|
|
//
|
|
// Third order solver.
|
|
|
|
// Author: W.Wander (MIT), 12.09.1997
|
|
// -------------------------------------------------------------------
|
|
#ifndef G4SIMPLEHEUM_HH
|
|
#define G4SIMPLEHEUM_HH
|
|
|
|
#include "G4MagErrorStepper.hh"
|
|
|
|
/**
|
|
* @brief G4SimpleHeum implements a simple Heum stepper for magnetic field
|
|
* with 3rd order solver.
|
|
*/
|
|
|
|
class G4SimpleHeum : public G4MagErrorStepper
|
|
{
|
|
public:
|
|
|
|
/**
|
|
* Constructor for G4SimpleHeum.
|
|
* @param[in] EqRhs Pointer to the provided equation of motion.
|
|
* @param[in] num_variables The number of integration variables.
|
|
*/
|
|
G4SimpleHeum(G4EquationOfMotion* EqRhs,
|
|
G4int num_variables = 6);
|
|
|
|
/**
|
|
* Destructor.
|
|
*/
|
|
~G4SimpleHeum() override;
|
|
|
|
/**
|
|
* Copy constructor and assignment operator not allowed.
|
|
*/
|
|
G4SimpleHeum(const G4SimpleHeum&) = delete;
|
|
G4SimpleHeum& operator=(const G4SimpleHeum&) = delete;
|
|
|
|
/**
|
|
* The stepper for the Runge Kutta integration, but performing a 'dump' step
|
|
* without error calculation.
|
|
* @param[in] y Starting values array of integration variables.
|
|
* @param[in] dydx Derivatives array.
|
|
* @param[in] h The given step size.
|
|
* @param[out] yout Integration output.
|
|
*/
|
|
void DumbStepper( const G4double y[],
|
|
const G4double dydx[],
|
|
G4double h,
|
|
G4double yout[] ) override;
|
|
|
|
/**
|
|
* Returns the order, 3, of integration.
|
|
*/
|
|
inline G4int IntegratorOrder() const override { return 3; }
|
|
|
|
/**
|
|
* Returns the stepper type-ID, "kSimpleHeum".
|
|
*/
|
|
inline G4StepperType StepperType() const override { return kSimpleHeum; }
|
|
|
|
private:
|
|
|
|
G4int fNumberOfVariables = 0;
|
|
|
|
G4double* dydxTemp = nullptr;
|
|
G4double* dydxTemp2 = nullptr;
|
|
G4double* yTemp = nullptr;
|
|
G4double* yTemp2 = nullptr;
|
|
};
|
|
|
|
#endif
|