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25 // 25 //
26 // G4HelixSimpleRunge implementation << 26 //
>> 27 // $Id: G4HelixSimpleRunge.cc,v 1.7 2006/06/29 18:24:08 gunter Exp $
>> 28 // GEANT4 tag $Name: geant4-09-01-patch-03 $
>> 29 //
27 // 30 //
28 // Simple Runge: 31 // Simple Runge:
29 // x_1 = x_0 + h * ( dx( t_0+h/2, x_0 + 32 // x_1 = x_0 + h * ( dx( t_0+h/2, x_0 + h/2 * dx( t_0, x_0) ) )
30 // 33 //
31 // Second order solver. 34 // Second order solver.
32 // Take the derivative at a position to be as 35 // Take the derivative at a position to be assumed at the middle of the
33 // Step and add it to the current position. 36 // Step and add it to the current position.
34 // 37 //
35 // Author: W. Wander <wwc@mit.edu>, 03.12.1998 << 38 // W.Wander <wwc@mit.edu> 12/09/97
36 // ------------------------------------------- 39 // -------------------------------------------------------------------------
37 40
38 #include "G4HelixSimpleRunge.hh" 41 #include "G4HelixSimpleRunge.hh"
39 #include "G4ThreeVector.hh" 42 #include "G4ThreeVector.hh"
40 43
41 G4HelixSimpleRunge::G4HelixSimpleRunge(G4Mag_E <<
42 : G4MagHelicalStepper(EqRhs) <<
43 { <<
44 } <<
45 <<
46 G4HelixSimpleRunge::~G4HelixSimpleRunge() = de <<
47 <<
48 void 44 void
49 G4HelixSimpleRunge::DumbStepper( const G4doubl << 45 G4HelixSimpleRunge::DumbStepper( const G4double yIn[],
50 G4Three << 46 G4ThreeVector Bfld,
51 G4doubl << 47 G4double h,
52 G4doubl << 48 G4double yOut[])
53 { 49 {
54 const G4int nvar = 6 ; 50 const G4int nvar = 6 ;
55 G4double yTemp[nvar]; // , yAdd[nvar]; 51 G4double yTemp[nvar]; // , yAdd[nvar];
56 G4ThreeVector Bfld_midpoint; 52 G4ThreeVector Bfld_midpoint;
57 53
58 AdvanceHelix( yIn, Bfld, 0.5 * h, yTemp); 54 AdvanceHelix( yIn, Bfld, 0.5 * h, yTemp);
59 55
60 // now obtain the new field value at the new 56 // now obtain the new field value at the new point
61 // <<
62 MagFieldEvaluate(yTemp, Bfld_midpoint); 57 MagFieldEvaluate(yTemp, Bfld_midpoint);
63 58
64 AdvanceHelix( yIn, Bfld_midpoint, h, yOut); 59 AdvanceHelix( yIn, Bfld_midpoint, h, yOut);
65 60
66 // NormaliseTangentVector( yOut ); 61 // NormaliseTangentVector( yOut );
67 } 62 }
68 63