| 1 | //
|
|---|
| 2 | // ********************************************************************
|
|---|
| 3 | // * License and Disclaimer *
|
|---|
| 4 | // * *
|
|---|
| 5 | // * The Geant4 software is copyright of the Copyright Holders of *
|
|---|
| 6 | // * the Geant4 Collaboration. It is provided under the terms and *
|
|---|
| 7 | // * conditions of the Geant4 Software License, included in the file *
|
|---|
| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These *
|
|---|
| 9 | // * include a list of copyright holders. *
|
|---|
| 10 | // * *
|
|---|
| 11 | // * Neither the authors of this software system, nor their employing *
|
|---|
| 12 | // * institutes,nor the agencies providing financial support for this *
|
|---|
| 13 | // * work make any representation or warranty, express or implied, *
|
|---|
| 14 | // * regarding this software system or assume any liability for its *
|
|---|
| 15 | // * use. Please see the license in the file LICENSE and URL above *
|
|---|
| 16 | // * for the full disclaimer and the limitation of liability. *
|
|---|
| 17 | // * *
|
|---|
| 18 | // * This code implementation is the result of the scientific and *
|
|---|
| 19 | // * technical work of the GEANT4 collaboration. *
|
|---|
| 20 | // * By using, copying, modifying or distributing the software (or *
|
|---|
| 21 | // * any work based on the software) you agree to acknowledge its *
|
|---|
| 22 | // * use in resulting scientific publications, and indicate your *
|
|---|
| 23 | // * acceptance of all terms of the Geant4 Software license. *
|
|---|
| 24 | // ********************************************************************
|
|---|
| 25 | //
|
|---|
| 26 | //
|
|---|
| 27 | //
|
|---|
| 28 | // $Id: G4RKG3_Stepper.hh,v 1.13 2007/05/18 12:44:02 tnikitin Exp $
|
|---|
| 29 | // GEANT4 tag $Name: $
|
|---|
| 30 | //
|
|---|
| 31 | //
|
|---|
| 32 | //
|
|---|
| 33 | // class G4RKG3_Stepper
|
|---|
| 34 | //
|
|---|
| 35 | // Class description:
|
|---|
| 36 | //
|
|---|
| 37 | // Integrator Runga-Kutta Stepper from Geant3.
|
|---|
| 38 | //
|
|---|
| 39 | // History:
|
|---|
| 40 | // - Created. J.Apostolakis, V.Grichine - 30.01.97
|
|---|
| 41 | // -------------------------------------------------------------------
|
|---|
| 42 |
|
|---|
| 43 | #ifndef G4RKG3_Stepper_hh
|
|---|
| 44 | #define G4RKG3_Stepper_hh
|
|---|
| 45 |
|
|---|
| 46 | #include "G4Types.hh"
|
|---|
| 47 | #include "G4MagIntegratorStepper.hh"
|
|---|
| 48 | #include "G4ThreeVector.hh"
|
|---|
| 49 |
|
|---|
| 50 | class G4Mag_EqRhs;
|
|---|
| 51 |
|
|---|
| 52 | class G4RKG3_Stepper : public G4MagIntegratorStepper
|
|---|
| 53 | {
|
|---|
| 54 | public: // with description
|
|---|
| 55 |
|
|---|
| 56 | G4RKG3_Stepper(G4Mag_EqRhs *EqRhs);
|
|---|
| 57 | // Integrate over 6 variables only: position & velocity.
|
|---|
| 58 | // Not implemented yet !
|
|---|
| 59 |
|
|---|
| 60 | ~G4RKG3_Stepper();
|
|---|
| 61 |
|
|---|
| 62 | void Stepper( const G4double yIn[],
|
|---|
| 63 | const G4double dydx[],
|
|---|
| 64 | G4double h,
|
|---|
| 65 | G4double yOut[],
|
|---|
| 66 | G4double yErr[] );
|
|---|
| 67 | // The method which must be provided, even if less efficient.
|
|---|
| 68 |
|
|---|
| 69 | G4double DistChord() const ;
|
|---|
| 70 |
|
|---|
| 71 | void StepNoErr( const G4double tIn[7],
|
|---|
| 72 | const G4double dydx[7],
|
|---|
| 73 | G4double Step,
|
|---|
| 74 | G4double tOut[7],
|
|---|
| 75 | G4double B[3] );
|
|---|
| 76 | // Integrator RK Stepper from G3 with only two field evaluation per
|
|---|
| 77 | // Step. It is used in propagation initial Step by small substeps
|
|---|
| 78 | // after solution error and delta geometry considerations.
|
|---|
| 79 | // B[3] is magnetic field which is passed from substep to substep.
|
|---|
| 80 |
|
|---|
| 81 | void StepWithEst( const G4double tIn[7],
|
|---|
| 82 | const G4double dydx[7],
|
|---|
| 83 | G4double Step,
|
|---|
| 84 | G4double tOut[7],
|
|---|
| 85 | G4double& alpha2,
|
|---|
| 86 | G4double& beta2,
|
|---|
| 87 | const G4double B1[3],
|
|---|
| 88 | G4double B2[3] );
|
|---|
| 89 | // Integrator for RK from G3 with evaluation of error in solution and delta
|
|---|
| 90 | // geometry based on naive similarity with the case of uniform magnetic field.
|
|---|
| 91 | // B1[3] is input and is the first magnetic field values
|
|---|
| 92 | // B2[3] is output and is the final magnetic field values.
|
|---|
| 93 |
|
|---|
| 94 | public: // without description
|
|---|
| 95 |
|
|---|
| 96 | G4int IntegratorOrder() const { return 4; }
|
|---|
| 97 |
|
|---|
| 98 | private:
|
|---|
| 99 |
|
|---|
| 100 | G4ThreeVector fyInitial,
|
|---|
| 101 | fyMidPoint,
|
|---|
| 102 | fyFinal;
|
|---|
| 103 | G4ThreeVector fpInitial;
|
|---|
| 104 | G4ThreeVector BfldIn;
|
|---|
| 105 | G4double hStep;
|
|---|
| 106 |
|
|---|
| 107 | G4Mag_EqRhs* fPtrMagEqOfMot;
|
|---|
| 108 | };
|
|---|
| 109 |
|
|---|
| 110 | #endif
|
|---|
