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1 // 1 //
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24 // ******************************************* 24 // ********************************************************************
25 // 25 //
26 // G4HelixHeum implementation <<
27 // 26 //
28 // Simple Heum: << 27 // $Id: G4HelixHeum.cc 66356 2012-12-18 09:02:32Z gcosmo $
>> 28 //
>> 29 //
>> 30 // Simple Heum:
29 // x_1 = x_0 + h * 31 // x_1 = x_0 + h *
30 // 1/4 * dx(t0,x0) + 32 // 1/4 * dx(t0,x0) +
31 // 3/4 * dx(t0+2/3*h, x0+2/3*h* 33 // 3/4 * dx(t0+2/3*h, x0+2/3*h*(dx(t0+h/3,x0+h/3*dx(t0,x0))))
32 // 34 //
33 // Third order solver. 35 // Third order solver.
34 // 36 //
35 // Author: W.Wander <wwc@mit.edu>, 03/11/1998 << 37 // W.Wander <wwc@mit.edu> 12/09/97
36 // ------------------------------------------- 38 // -------------------------------------------------------------------
37 39
38 #include "G4HelixHeum.hh" 40 #include "G4HelixHeum.hh"
39 #include "G4ThreeVector.hh" 41 #include "G4ThreeVector.hh"
40 42
41 G4HelixHeum::G4HelixHeum(G4Mag_EqRhs* EqRhs) <<
42 : G4MagHelicalStepper(EqRhs) <<
43 { <<
44 } <<
45 <<
46 G4HelixHeum::~G4HelixHeum() = default; <<
47 <<
48 void 43 void
49 G4HelixHeum::DumbStepper( const G4double yIn[ 44 G4HelixHeum::DumbStepper( const G4double yIn[],
50 G4ThreeVector Bfld << 45 G4ThreeVector Bfld,
51 G4double h, << 46 G4double h,
52 G4double yOut << 47 G4double yOut[])
53 { 48 {
54 const G4int nvar = 6 ; 49 const G4int nvar = 6 ;
55 50
56 G4ThreeVector Bfield_Temp, Bfield_Temp2; 51 G4ThreeVector Bfield_Temp, Bfield_Temp2;
57 G4double yTemp[6], yAdd1[6], yAdd2[6] , yTem 52 G4double yTemp[6], yAdd1[6], yAdd2[6] , yTemp2[6];
58 53
>> 54 G4int i;
>> 55
59 AdvanceHelix( yIn, Bfld, h, yAdd1 ); 56 AdvanceHelix( yIn, Bfld, h, yAdd1 );
60 57
61 AdvanceHelix( yIn, Bfld, h/3.0, yTemp ); 58 AdvanceHelix( yIn, Bfld, h/3.0, yTemp );
62 MagFieldEvaluate(yTemp,Bfield_Temp); 59 MagFieldEvaluate(yTemp,Bfield_Temp);
63 60
64 AdvanceHelix( yIn, Bfield_Temp, (2.0 / 3.0) 61 AdvanceHelix( yIn, Bfield_Temp, (2.0 / 3.0) * h, yTemp2 );
65 62
66 MagFieldEvaluate(yTemp2,Bfield_Temp2); 63 MagFieldEvaluate(yTemp2,Bfield_Temp2);
67 64
68 AdvanceHelix( yIn, Bfield_Temp2, h, yAdd2 ); 65 AdvanceHelix( yIn, Bfield_Temp2, h, yAdd2 );
69 66
70 for( G4int i = 0; i < nvar; ++i ) << 67 for( i = 0; i < nvar; i++ ) {
71 { <<
72 yOut[i] = ( 0.25 * yAdd1[i] + 0.75 * yAdd2 68 yOut[i] = ( 0.25 * yAdd1[i] + 0.75 * yAdd2[i]);
73 } 69 }
74 70
75 // NormaliseTangentVector( yOut ); 71 // NormaliseTangentVector( yOut );
76 } 72 }
77 73