Geant4 Cross Reference

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Geant4/geometry/magneticfield/src/G4ExactHelixStepper.cc

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Diff markup

Differences between /geometry/magneticfield/src/G4ExactHelixStepper.cc (Version 11.3.0) and /geometry/magneticfield/src/G4ExactHelixStepper.cc (Version 7.1.p1)


  1 //                                                  1 
  2 // *******************************************    
  3 // * License and Disclaimer                       
  4 // *                                              
  5 // * The  Geant4 software  is  copyright of th    
  6 // * the Geant4 Collaboration.  It is provided    
  7 // * conditions of the Geant4 Software License    
  8 // * LICENSE and available at  http://cern.ch/    
  9 // * include a list of copyright holders.         
 10 // *                                              
 11 // * Neither the authors of this software syst    
 12 // * institutes,nor the agencies providing fin    
 13 // * work  make  any representation or  warran    
 14 // * regarding  this  software system or assum    
 15 // * use.  Please see the license in the file     
 16 // * for the full disclaimer and the limitatio    
 17 // *                                              
 18 // * This  code  implementation is the result     
 19 // * technical work of the GEANT4 collaboratio    
 20 // * By using,  copying,  modifying or  distri    
 21 // * any work based  on the software)  you  ag    
 22 // * use  in  resulting  scientific  publicati    
 23 // * acceptance of all terms of the Geant4 Sof    
 24 // *******************************************    
 25 //                                                
 26 // G4ExactHelixStepper implementation             
 27 //                                                
 28 // Author: J.Apostolakis, 28.01.2005.             
 29 //         Implementation adapted from Explici    
 30 // -------------------------------------------    
 31                                                   
 32 #include "G4ExactHelixStepper.hh"                 
 33 #include "G4PhysicalConstants.hh"                 
 34 #include "G4ThreeVector.hh"                       
 35 #include "G4LineSection.hh"                       
 36                                                   
 37 G4ExactHelixStepper::G4ExactHelixStepper(G4Mag    
 38   : G4MagHelicalStepper(EqRhs),                   
 39     fBfieldValue(DBL_MAX, DBL_MAX, DBL_MAX)       
 40 {                                                 
 41 }                                                 
 42                                                   
 43 G4ExactHelixStepper::~G4ExactHelixStepper() =     
 44                                                   
 45 // -------------------------------------------    
 46                                                   
 47 void                                              
 48 G4ExactHelixStepper::Stepper( const G4double y    
 49                               const G4double*,    
 50                                     G4double h    
 51                                     G4double y    
 52                                     G4double y    
 53 {                                                 
 54   const G4int nvar = 6;                           
 55                                                   
 56   G4int i;                                        
 57   G4ThreeVector Bfld_value;                       
 58                                                   
 59   MagFieldEvaluate(yInput, Bfld_value);           
 60   AdvanceHelix(yInput, Bfld_value, hstep, yOut    
 61                                                   
 62   // We are assuming a constant field: helix i    
 63   //                                              
 64   for(i=0; i<nvar; ++i)                           
 65   {                                               
 66     yErr[i] = 0.0 ;                               
 67   }                                               
 68                                                   
 69   fBfieldValue = Bfld_value;                      
 70 }                                                 
 71                                                   
 72 // -------------------------------------------    
 73                                                   
 74 void                                              
 75 G4ExactHelixStepper::DumbStepper( const G4doub    
 76                                         G4Thre    
 77                                         G4doub    
 78                                         G4doub    
 79 {                                                 
 80   // Assuming a constant field: solution is a     
 81                                                   
 82   AdvanceHelix(yIn, Bfld, h, yOut);               
 83                                                   
 84   G4Exception("G4ExactHelixStepper::DumbSteppe    
 85               "GeomField0002", FatalException,    
 86               "Should not be called. Stepper m    
 87 }                                                 
 88                                                   
 89                                                   
 90 // -------------------------------------------    
 91                                                   
 92 G4double                                          
 93 G4ExactHelixStepper::DistChord() const            
 94 {                                                 
 95   // Implementation : must check whether h/R >    
 96   //   If( h/R <  pi)   DistChord=h/2*std::tan    
 97   //   Else             DistChord=R_helix         
 98                                                   
 99   G4double distChord;                             
100   G4double Ang_curve=GetAngCurve();               
101                                                   
102   if (Ang_curve<=pi)                              
103   {                                               
104     distChord=GetRadHelix()*(1-std::cos(0.5*An    
105   }                                               
106   else if(Ang_curve<twopi)                        
107   {                                               
108     distChord=GetRadHelix()*(1+std::cos(0.5*(t    
109   }                                               
110   else                                            
111   {                                               
112     distChord=2.*GetRadHelix();                   
113   }                                               
114                                                   
115   return distChord;                               
116 }                                                 
117                                                   
118 // -------------------------------------------    
119                                                   
120 G4int                                             
121 G4ExactHelixStepper::IntegratorOrder() const      
122 {                                                 
123   return 1;                                       
124 }                                                 
125