Geant4 Cross Reference

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

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  1 //
  2 // ********************************************************************
  3 // * License and Disclaimer                                           *
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 25 //
 26 // G4HelixSimpleRunge implementation
 27 //
 28 //  Simple Runge:
 29 //        x_1 = x_0 + h * ( dx( t_0+h/2, x_0 + h/2 * dx( t_0, x_0) ) )
 30 //
 31 //  Second order solver.
 32 //  Take the derivative at a position to be assumed at the middle of the
 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"
 39 #include "G4ThreeVector.hh"
 40 
 41 G4HelixSimpleRunge::G4HelixSimpleRunge(G4Mag_EqRhs* EqRhs)
 42   : G4MagHelicalStepper(EqRhs)
 43 {
 44 }
 45 
 46 G4HelixSimpleRunge::~G4HelixSimpleRunge() = default;
 47 
 48 void
 49 G4HelixSimpleRunge::DumbStepper( const G4double      yIn[],
 50                                        G4ThreeVector Bfld,
 51                                        G4double      h,
 52                                        G4double      yOut[] )
 53 {
 54   const G4int nvar = 6 ;
 55   G4double yTemp[nvar];   // , yAdd[nvar];
 56   G4ThreeVector Bfld_midpoint;
 57 
 58   AdvanceHelix( yIn, Bfld, 0.5 * h, yTemp);
 59   
 60   // now obtain the new field value at the new point
 61   //
 62   MagFieldEvaluate(yTemp, Bfld_midpoint);      
 63 
 64   AdvanceHelix( yIn, Bfld_midpoint, h, yOut);
 65   
 66   // NormaliseTangentVector( yOut );           
 67 }  
 68