Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/geometry/magneticfield/src/G4HelixSimpleRunge.cc

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Diff markup

Differences between /geometry/magneticfield/src/G4HelixSimpleRunge.cc (Version 11.3.0) and /geometry/magneticfield/src/G4HelixSimpleRunge.cc (Version 4.1.p1)


  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: geant4-04-01 $
 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