Geant4 Cross Reference |
1 // 1 // 2 // ******************************************* 2 // ******************************************************************** 3 // * License and Disclaimer << 3 // * DISCLAIMER * 4 // * 4 // * * 5 // * The Geant4 software is copyright of th << 5 // * The following disclaimer summarizes all the specific disclaimers * 6 // * the Geant4 Collaboration. It is provided << 6 // * of contributors to this software. The specific disclaimers,which * 7 // * conditions of the Geant4 Software License << 7 // * govern, are listed with their locations in: * 8 // * LICENSE and available at http://cern.ch/ << 8 // * http://cern.ch/geant4/license * 9 // * include a list of copyright holders. << 10 // * 9 // * * 11 // * Neither the authors of this software syst 10 // * Neither the authors of this software system, nor their employing * 12 // * institutes,nor the agencies providing fin 11 // * institutes,nor the agencies providing financial support for this * 13 // * work make any representation or warran 12 // * work make any representation or warranty, express or implied, * 14 // * regarding this software system or assum 13 // * regarding this software system or assume any liability for its * 15 // * use. Please see the license in the file << 14 // * use. * 16 // * for the full disclaimer and the limitatio << 17 // * 15 // * * 18 // * This code implementation is the result << 16 // * This code implementation is the intellectual property of the * 19 // * technical work of the GEANT4 collaboratio << 17 // * GEANT4 collaboration. * 20 // * By using, copying, modifying or distri << 18 // * By copying, distributing or modifying the Program (or any work * 21 // * any work based on the software) you ag << 19 // * based on the Program) you indicate your acceptance of this * 22 // * use in resulting scientific publicati << 20 // * statement, and all its terms. * 23 // * acceptance of all terms of the Geant4 Sof << 24 // ******************************************* 21 // ******************************************************************** 25 // 22 // 26 // G4HelixSimpleRunge implementation << 27 // 23 // 28 // Simple Runge: << 24 // $Id: G4HelixSimpleRunge.cc,v 1.5 2001/07/11 09:59:12 gunter Exp $ 29 // x_1 = x_0 + h * ( dx( t_0+h/2, x_0 + << 25 // GEANT4 tag $Name: geant4-05-00 $ 30 // 26 // 31 // Second order solver. << 32 // Take the derivative at a position to be as << 33 // Step and add it to the current position. << 34 // << 35 // Author: W. Wander <wwc@mit.edu>, 03.12.1998 << 36 // ------------------------------------------- << 37 << 38 #include "G4HelixSimpleRunge.hh" 27 #include "G4HelixSimpleRunge.hh" 39 #include "G4ThreeVector.hh" 28 #include "G4ThreeVector.hh" 40 29 41 G4HelixSimpleRunge::G4HelixSimpleRunge(G4Mag_E << 30 // 42 : G4MagHelicalStepper(EqRhs) << 31 // Simple Runge: 43 { << 32 // x_1 = x_0 + h * ( dx( t_0+h/2, x_0 + h/2 * dx( t_0, x_0) ) ) 44 } << 33 // W.Wander <wwc@mit.edu> 12/09/97 >> 34 // 45 35 46 G4HelixSimpleRunge::~G4HelixSimpleRunge() = de << 36 // ------------------------------------------------------------------------- >> 37 >> 38 // second order solver >> 39 // take the derivative at a position to be assumed at the middle of the >> 40 // Step and add it to the current position. >> 41 // 47 42 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 ); >> 61 >> 62 return ; 67 } 63 } 68 64