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G4NystromRK4.hh
Go to the documentation of this file.
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//
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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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// G4NystromRK4
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//
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// Class description:
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//
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// Integrates the equations of the motion of a particle in a magnetic field
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// using 4th Runge-Kutta-Nystrom method with errors estimation
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// (ATL-SOFT-PUB-2009-01)
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// Current form can be used only for 'pure' magnetic field.
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// Notes: 1) field must be time-independent.
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// 2) time is not integrated
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// Created: I.Gavrilenko, 15.05.2009 (as G4AtlasRK4)
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// Adaptations: J.Apostolakis, November 2009
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// -------------------------------------------------------------------
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#ifndef G4NYSTROMRK4_HH
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#define G4NYSTROMRK4_HH
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#include "
G4MagIntegratorStepper.hh
"
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#include "
G4Mag_EqRhs.hh
"
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#include "
G4CachedMagneticField.hh
"
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#include "
G4ThreeVector.hh
"
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#include <memory>
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class
G4NystromRK4
:
public
G4MagIntegratorStepper
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{
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public
:
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G4NystromRK4
(
G4Mag_EqRhs
* EquationMotion,
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G4double
distanceConstField = 0.0);
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// Can be used only for Magnetic Fields - and for 6 variables (x,p)
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virtual
void
Stepper
(
const
G4double
y
[],
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const
G4double
dydx[],
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G4double
hstep,
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G4double
yOut[],
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G4double
yError[])
override
;
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// Single call for integration result and error
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// Provides error via analytical method
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void
SetDistanceForConstantField
(
G4double
length
);
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G4double
GetDistanceForConstantField
()
const
;
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virtual
G4int
IntegratorOrder
()
const override
{
return
4; }
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virtual
G4double
DistChord
()
const override
;
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private
:
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inline
void
GetFieldValue
(
const
G4double
point
[4],
G4double
field[3]);
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inline
G4double
GetFCof
();
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G4CachedMagneticField
*
GetField
();
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const
G4CachedMagneticField
*
GetField
()
const
;
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G4double
fMomentum
= 0.0;
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G4double
fMomentum2
= 0.0;
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G4double
fInverseMomentum
= 0.0;
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G4double
fCoefficient
= 0.0;
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G4ThreeVector
fInitialPoint
;
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G4ThreeVector
fMidPoint
;
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G4ThreeVector
fEndPoint
;
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std::unique_ptr<G4CachedMagneticField>
fCachedField
;
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};
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#include "G4NystromRK4.icc"
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#endif
geant4
tree
geant4-10.6-release
source
geometry
magneticfield
include
G4NystromRK4.hh
Built by
Jin Huang
. updated:
Wed Jun 29 2022 17:25:16
using
1.8.2 with
ECCE GitHub integration