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1 // 1 //
2 // ******************************************* 2 // ********************************************************************
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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: geant4-05-02-patch-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