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1 // 1 //
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18 // * This code implementation is the result 18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboratio 19 // * technical work of the GEANT4 collaboration. *
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24 // ******************************************* 24 // ********************************************************************
25 // 25 //
26 // G4HelixSimpleRunge implementation 26 // G4HelixSimpleRunge implementation
27 // 27 //
28 // Simple Runge: 28 // Simple Runge:
29 // x_1 = x_0 + h * ( dx( t_0+h/2, x_0 + 29 // x_1 = x_0 + h * ( dx( t_0+h/2, x_0 + h/2 * dx( t_0, x_0) ) )
30 // 30 //
31 // Second order solver. 31 // Second order solver.
32 // Take the derivative at a position to be as 32 // Take the derivative at a position to be assumed at the middle of the
33 // Step and add it to the current position. 33 // Step and add it to the current position.
34 // 34 //
35 // Author: W. Wander <wwc@mit.edu>, 03.12.1998 35 // Author: W. Wander <wwc@mit.edu>, 03.12.1998
36 // ------------------------------------------- 36 // -------------------------------------------------------------------------
37 37
38 #include "G4HelixSimpleRunge.hh" 38 #include "G4HelixSimpleRunge.hh"
39 #include "G4ThreeVector.hh" 39 #include "G4ThreeVector.hh"
40 40
41 G4HelixSimpleRunge::G4HelixSimpleRunge(G4Mag_E 41 G4HelixSimpleRunge::G4HelixSimpleRunge(G4Mag_EqRhs* EqRhs)
42 : G4MagHelicalStepper(EqRhs) 42 : G4MagHelicalStepper(EqRhs)
43 { 43 {
44 } 44 }
45 45
46 G4HelixSimpleRunge::~G4HelixSimpleRunge() = de << 46 G4HelixSimpleRunge::~G4HelixSimpleRunge()
>> 47 {
>> 48 }
47 49
48 void 50 void
49 G4HelixSimpleRunge::DumbStepper( const G4doubl 51 G4HelixSimpleRunge::DumbStepper( const G4double yIn[],
50 G4Three 52 G4ThreeVector Bfld,
51 G4doubl 53 G4double h,
52 G4doubl 54 G4double yOut[] )
53 { 55 {
54 const G4int nvar = 6 ; 56 const G4int nvar = 6 ;
55 G4double yTemp[nvar]; // , yAdd[nvar]; 57 G4double yTemp[nvar]; // , yAdd[nvar];
56 G4ThreeVector Bfld_midpoint; 58 G4ThreeVector Bfld_midpoint;
57 59
58 AdvanceHelix( yIn, Bfld, 0.5 * h, yTemp); 60 AdvanceHelix( yIn, Bfld, 0.5 * h, yTemp);
59 61
60 // now obtain the new field value at the new 62 // now obtain the new field value at the new point
61 // 63 //
62 MagFieldEvaluate(yTemp, Bfld_midpoint); 64 MagFieldEvaluate(yTemp, Bfld_midpoint);
63 65
64 AdvanceHelix( yIn, Bfld_midpoint, h, yOut); 66 AdvanceHelix( yIn, Bfld_midpoint, h, yOut);
65 67
66 // NormaliseTangentVector( yOut ); 68 // NormaliseTangentVector( yOut );
67 } 69 }
68 70