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1 // 1 //
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4 // * 4 // * *
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17 // * 17 // * *
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. *
20 // * By using, copying, modifying or distri 20 // * By using, copying, modifying or distributing the software (or *
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24 // ******************************************* 24 // ********************************************************************
25 // 25 //
26 // G4HelixHeum implementation 26 // G4HelixHeum implementation
27 // 27 //
28 // Simple Heum: 28 // Simple Heum:
29 // x_1 = x_0 + h * 29 // x_1 = x_0 + h *
30 // 1/4 * dx(t0,x0) + 30 // 1/4 * dx(t0,x0) +
31 // 3/4 * dx(t0+2/3*h, x0+2/3*h* 31 // 3/4 * dx(t0+2/3*h, x0+2/3*h*(dx(t0+h/3,x0+h/3*dx(t0,x0))))
32 // 32 //
33 // Third order solver. 33 // Third order solver.
34 // 34 //
35 // Author: W.Wander <wwc@mit.edu>, 03/11/1998 35 // Author: W.Wander <wwc@mit.edu>, 03/11/1998
36 // ------------------------------------------- 36 // -------------------------------------------------------------------
37 37
38 #include "G4HelixHeum.hh" 38 #include "G4HelixHeum.hh"
39 #include "G4ThreeVector.hh" 39 #include "G4ThreeVector.hh"
40 40
41 G4HelixHeum::G4HelixHeum(G4Mag_EqRhs* EqRhs) 41 G4HelixHeum::G4HelixHeum(G4Mag_EqRhs* EqRhs)
42 : G4MagHelicalStepper(EqRhs) 42 : G4MagHelicalStepper(EqRhs)
43 { 43 {
44 } 44 }
45 45
46 G4HelixHeum::~G4HelixHeum() = default; << 46 G4HelixHeum::~G4HelixHeum()
>> 47 {
>> 48 }
47 49
48 void 50 void
49 G4HelixHeum::DumbStepper( const G4double yIn[ 51 G4HelixHeum::DumbStepper( const G4double yIn[],
50 G4ThreeVector Bfld 52 G4ThreeVector Bfld,
51 G4double h, 53 G4double h,
52 G4double yOut 54 G4double yOut[])
53 { 55 {
54 const G4int nvar = 6 ; 56 const G4int nvar = 6 ;
55 57
56 G4ThreeVector Bfield_Temp, Bfield_Temp2; 58 G4ThreeVector Bfield_Temp, Bfield_Temp2;
57 G4double yTemp[6], yAdd1[6], yAdd2[6] , yTem 59 G4double yTemp[6], yAdd1[6], yAdd2[6] , yTemp2[6];
58 60
59 AdvanceHelix( yIn, Bfld, h, yAdd1 ); 61 AdvanceHelix( yIn, Bfld, h, yAdd1 );
60 62
61 AdvanceHelix( yIn, Bfld, h/3.0, yTemp ); 63 AdvanceHelix( yIn, Bfld, h/3.0, yTemp );
62 MagFieldEvaluate(yTemp,Bfield_Temp); 64 MagFieldEvaluate(yTemp,Bfield_Temp);
63 65
64 AdvanceHelix( yIn, Bfield_Temp, (2.0 / 3.0) 66 AdvanceHelix( yIn, Bfield_Temp, (2.0 / 3.0) * h, yTemp2 );
65 67
66 MagFieldEvaluate(yTemp2,Bfield_Temp2); 68 MagFieldEvaluate(yTemp2,Bfield_Temp2);
67 69
68 AdvanceHelix( yIn, Bfield_Temp2, h, yAdd2 ); 70 AdvanceHelix( yIn, Bfield_Temp2, h, yAdd2 );
69 71
70 for( G4int i = 0; i < nvar; ++i ) 72 for( G4int i = 0; i < nvar; ++i )
71 { 73 {
72 yOut[i] = ( 0.25 * yAdd1[i] + 0.75 * yAdd2 74 yOut[i] = ( 0.25 * yAdd1[i] + 0.75 * yAdd2[i]);
73 } 75 }
74 76
75 // NormaliseTangentVector( yOut ); 77 // NormaliseTangentVector( yOut );
76 } 78 }
77 79