Geant4 Cross Reference |
1 // 1 // 2 // ******************************************* 2 // ******************************************************************** 3 // * License and Disclaimer 3 // * License and Disclaimer * 4 // * 4 // * * 5 // * The Geant4 software is copyright of th 5 // * The Geant4 software is copyright of the Copyright Holders of * 6 // * the Geant4 Collaboration. It is provided 6 // * the Geant4 Collaboration. It is provided under the terms and * 7 // * conditions of the Geant4 Software License 7 // * conditions of the Geant4 Software License, included in the file * 8 // * LICENSE and available at http://cern.ch/ 8 // * LICENSE and available at http://cern.ch/geant4/license . These * 9 // * include a list of copyright holders. 9 // * include a list of copyright holders. * 10 // * 10 // * * 11 // * Neither the authors of this software syst 11 // * Neither the authors of this software system, nor their employing * 12 // * institutes,nor the agencies providing fin 12 // * institutes,nor the agencies providing financial support for this * 13 // * work make any representation or warran 13 // * work make any representation or warranty, express or implied, * 14 // * regarding this software system or assum 14 // * regarding this software system or assume any liability for its * 15 // * use. Please see the license in the file 15 // * use. Please see the license in the file LICENSE and URL above * 16 // * for the full disclaimer and the limitatio 16 // * for the full disclaimer and the limitation of liability. * 17 // * 17 // * * 18 // * This code implementation is the result 18 // * This code implementation is the result of the scientific and * 19 // * technical work of the GEANT4 collaboratio 19 // * technical work of the GEANT4 collaboration. * 20 // * By using, copying, modifying or distri 20 // * By using, copying, modifying or distributing the software (or * 21 // * any work based on the software) you ag 21 // * any work based on the software) you agree to acknowledge its * 22 // * use in resulting scientific publicati 22 // * use in resulting scientific publications, and indicate your * 23 // * acceptance of all terms of the Geant4 Sof 23 // * acceptance of all terms of the Geant4 Software license. * 24 // ******************************************* 24 // ******************************************************************** 25 // 25 // 26 // G4HelixSimpleRunge implementation << 26 // >> 27 // $Id: G4HelixSimpleRunge.cc 66356 2012-12-18 09:02:32Z gcosmo $ >> 28 // 27 // 29 // 28 // Simple Runge: 30 // Simple Runge: 29 // x_1 = x_0 + h * ( dx( t_0+h/2, x_0 + 31 // x_1 = x_0 + h * ( dx( t_0+h/2, x_0 + h/2 * dx( t_0, x_0) ) ) 30 // 32 // 31 // Second order solver. 33 // Second order solver. 32 // Take the derivative at a position to be as 34 // Take the derivative at a position to be assumed at the middle of the 33 // Step and add it to the current position. 35 // Step and add it to the current position. 34 // 36 // 35 // Author: W. Wander <wwc@mit.edu>, 03.12.1998 << 37 // W.Wander <wwc@mit.edu> 12/09/97 36 // ------------------------------------------- 38 // ------------------------------------------------------------------------- 37 39 38 #include "G4HelixSimpleRunge.hh" 40 #include "G4HelixSimpleRunge.hh" 39 #include "G4ThreeVector.hh" 41 #include "G4ThreeVector.hh" 40 42 41 G4HelixSimpleRunge::G4HelixSimpleRunge(G4Mag_E << 42 : G4MagHelicalStepper(EqRhs) << 43 { << 44 } << 45 << 46 G4HelixSimpleRunge::~G4HelixSimpleRunge() = de << 47 << 48 void 43 void 49 G4HelixSimpleRunge::DumbStepper( const G4doubl << 44 G4HelixSimpleRunge::DumbStepper( const G4double yIn[], 50 G4Three << 45 G4ThreeVector Bfld, 51 G4doubl << 46 G4double h, 52 G4doubl << 47 G4double yOut[]) 53 { 48 { 54 const G4int nvar = 6 ; 49 const G4int nvar = 6 ; 55 G4double yTemp[nvar]; // , yAdd[nvar]; 50 G4double yTemp[nvar]; // , yAdd[nvar]; 56 G4ThreeVector Bfld_midpoint; 51 G4ThreeVector Bfld_midpoint; 57 52 58 AdvanceHelix( yIn, Bfld, 0.5 * h, yTemp); 53 AdvanceHelix( yIn, Bfld, 0.5 * h, yTemp); 59 54 60 // now obtain the new field value at the new 55 // now obtain the new field value at the new point 61 // << 62 MagFieldEvaluate(yTemp, Bfld_midpoint); 56 MagFieldEvaluate(yTemp, Bfld_midpoint); 63 57 64 AdvanceHelix( yIn, Bfld_midpoint, h, yOut); 58 AdvanceHelix( yIn, Bfld_midpoint, h, yOut); 65 59 66 // NormaliseTangentVector( yOut ); 60 // NormaliseTangentVector( yOut ); 67 } 61 } 68 62