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Geant4/geometry/magneticfield/src/G4HelixImplicitEuler.cc

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Diff markup

Differences between /geometry/magneticfield/src/G4HelixImplicitEuler.cc (Version 11.3.0) and /geometry/magneticfield/src/G4HelixImplicitEuler.cc (Version 5.0.p1)


  1 //                                                  1 //
  2 // *******************************************      2 // ********************************************************************
  3 // * License and Disclaimer                    <<   3 // * DISCLAIMER                                                       *
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 15 // * use.  Please see the license in the file  <<  14 // * use.                                                             *
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 17 // *                                               15 // *                                                                  *
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 19 // * technical work of the GEANT4 collaboratio <<  17 // * GEANT4 collaboration.                                            *
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 24 // *******************************************     21 // ********************************************************************
 25 //                                                 22 //
 26 // G4HelixImplicitEuler implementation         <<  23 //
                                                   >>  24 // $Id: G4HelixImplicitEuler.cc,v 1.4 2001/07/11 09:59:12 gunter Exp $
                                                   >>  25 // GEANT4 tag $Name: geant4-05-00 $
                                                   >>  26 //
                                                   >>  27 #include "G4HelixImplicitEuler.hh"
                                                   >>  28 #include "G4ThreeVector.hh"
                                                   >>  29 
 27 //                                                 30 //
 28 //  Helix Implicit Euler:                          31 //  Helix Implicit Euler:
 29 //        x_1 = x_0 + 1/2 * ( helix(h,t_0,x_0)     32 //        x_1 = x_0 + 1/2 * ( helix(h,t_0,x_0)
 30 //                          + helix(h,t_0+h,x_     33 //                          + helix(h,t_0+h,x_0+helix(h,t0,x0) ) )
 31 //  Second order solver.                       <<  34 //  W.Wander <wwc@mit.edu> 12/09/97 
 32 //  Take the current derivative and add it to  << 
 33 //  Take the output and its derivative. Add th << 
 34 //  to form the final output                   << 
 35 //                                                 35 //
 36 // Author: W.Wander <wwc@mit.edu>, 03/11/1998  << 
 37 // ------------------------------------------- << 
 38                                                    36 
 39 #include "G4HelixImplicitEuler.hh"             <<  37 // -------------------------------------------------------------------------
 40 #include "G4ThreeVector.hh"                    << 
 41                                                    38 
 42 G4HelixImplicitEuler::G4HelixImplicitEuler(G4M <<  39 // second order solver
 43   : G4MagHelicalStepper(EqRhs)                 <<  40 // Take the current derivative and add it to the current position.
 44 {                                              <<  41 // Take the output and its derivative. Add the mean of both derivatives
 45 }                                              <<  42 // to form the final output
                                                   >>  43 //
 46                                                    44 
 47 G4HelixImplicitEuler::~G4HelixImplicitEuler()  << 
 48                                                << 
 49 void                                               45 void
 50 G4HelixImplicitEuler::DumbStepper( const G4dou <<  46 G4HelixImplicitEuler::DumbStepper( const G4double  yIn[],
 51                                    G4ThreeVect <<  47            G4ThreeVector   Bfld,
 52                                    G4double    <<  48            G4double        h,
 53                                    G4double    <<  49            G4double        yOut[])
 54 {                                                  50 {
 55   const G4int nvar = 6 ;                           51   const G4int nvar = 6 ;
 56   G4double yTemp[6], yTemp2[6];                    52   G4double yTemp[6], yTemp2[6];
 57   G4ThreeVector Bfld_endpoint;                     53   G4ThreeVector Bfld_endpoint;
 58                                                    54 
                                                   >>  55   G4int i;
                                                   >>  56 
 59   // Step forward like in the explicit euler c     57   // Step forward like in the explicit euler case
 60   //                                           << 
 61   AdvanceHelix( yIn, Bfld, h, yTemp);              58   AdvanceHelix( yIn, Bfld, h, yTemp);
 62                                                    59 
 63   // now obtain the new field value at the new     60   // now obtain the new field value at the new point
 64   //                                           << 
 65   MagFieldEvaluate(yTemp, Bfld_endpoint);          61   MagFieldEvaluate(yTemp, Bfld_endpoint);      
 66                                                    62 
 67   // and also advance along a helix for this f     63   // and also advance along a helix for this field value
 68   //                                           << 
 69   AdvanceHelix( yIn, Bfld_endpoint, h, yTemp2)     64   AdvanceHelix( yIn, Bfld_endpoint, h, yTemp2);
 70                                                    65 
 71   // we take the average                       <<  66   // we take the average 
 72   //                                           <<  67   for( i = 0; i < nvar; i++ ) 
 73   for( G4int i = 0; i < nvar; ++i )            << 
 74   {                                            << 
 75     yOut[i] = 0.5 * ( yTemp[i] + yTemp2[i] );      68     yOut[i] = 0.5 * ( yTemp[i] + yTemp2[i] );
 76   }                                            << 
 77                                                    69 
 78   // NormaliseTangentVector( yOut );               70   // NormaliseTangentVector( yOut );           
                                                   >>  71   
                                                   >>  72   return ;
 79 }                                                  73 }  
 80                                                    74