| Geant4 Cross Reference |
1 // 1 //
2 // ******************************************* 2 // ********************************************************************
3 // * License and Disclaimer << 3 // * DISCLAIMER *
4 // * 4 // * *
5 // * The Geant4 software is copyright of th << 5 // * The following disclaimer summarizes all the specific disclaimers *
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10 // * 9 // * *
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15 // * use. Please see the license in the file << 14 // * use. *
16 // * for the full disclaimer and the limitatio <<
17 // * 15 // * *
18 // * This code implementation is the result << 16 // * This code implementation is the intellectual property of the *
19 // * technical work of the GEANT4 collaboratio << 17 // * GEANT4 collaboration. *
20 // * By using, copying, modifying or distri << 18 // * By copying, distributing or modifying the Program (or any work *
21 // * any work based on the software) you ag << 19 // * based on the Program) you indicate your acceptance of this *
22 // * use in resulting scientific publicati << 20 // * statement, and all its terms. *
23 // * acceptance of all terms of the Geant4 Sof <<
24 // ******************************************* 21 // ********************************************************************
25 // 22 //
26 // G4HelixHeum implementation <<
27 // 23 //
28 // Simple Heum: << 24 // $Id: G4HelixHeum.cc,v 1.5 2003/10/31 14:35:54 gcosmo Exp $
>> 25 // GEANT4 tag $Name: geant4-08-00 $
>> 26 //
>> 27 //
>> 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 // W.Wander <wwc@mit.edu> 12/09/97
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) <<
42 : G4MagHelicalStepper(EqRhs) <<
43 { <<
44 } <<
45 <<
46 G4HelixHeum::~G4HelixHeum() = default; <<
47 <<
48 void 41 void
49 G4HelixHeum::DumbStepper( const G4double yIn[ 42 G4HelixHeum::DumbStepper( const G4double yIn[],
50 G4ThreeVector Bfld << 43 G4ThreeVector Bfld,
51 G4double h, << 44 G4double h,
52 G4double yOut << 45 G4double yOut[])
53 { 46 {
54 const G4int nvar = 6 ; 47 const G4int nvar = 6 ;
55 48
56 G4ThreeVector Bfield_Temp, Bfield_Temp2; 49 G4ThreeVector Bfield_Temp, Bfield_Temp2;
57 G4double yTemp[6], yAdd1[6], yAdd2[6] , yTem 50 G4double yTemp[6], yAdd1[6], yAdd2[6] , yTemp2[6];
58 51
>> 52 G4int i;
>> 53
59 AdvanceHelix( yIn, Bfld, h, yAdd1 ); 54 AdvanceHelix( yIn, Bfld, h, yAdd1 );
60 55
61 AdvanceHelix( yIn, Bfld, h/3.0, yTemp ); 56 AdvanceHelix( yIn, Bfld, h/3.0, yTemp );
62 MagFieldEvaluate(yTemp,Bfield_Temp); 57 MagFieldEvaluate(yTemp,Bfield_Temp);
63 58
64 AdvanceHelix( yIn, Bfield_Temp, (2.0 / 3.0) 59 AdvanceHelix( yIn, Bfield_Temp, (2.0 / 3.0) * h, yTemp2 );
65 60
66 MagFieldEvaluate(yTemp2,Bfield_Temp2); 61 MagFieldEvaluate(yTemp2,Bfield_Temp2);
67 62
68 AdvanceHelix( yIn, Bfield_Temp2, h, yAdd2 ); 63 AdvanceHelix( yIn, Bfield_Temp2, h, yAdd2 );
69 64
70 for( G4int i = 0; i < nvar; ++i ) << 65 for( i = 0; i < nvar; i++ ) {
71 { <<
72 yOut[i] = ( 0.25 * yAdd1[i] + 0.75 * yAdd2 66 yOut[i] = ( 0.25 * yAdd1[i] + 0.75 * yAdd2[i]);
73 } 67 }
74 68
75 // NormaliseTangentVector( yOut ); 69 // NormaliseTangentVector( yOut );
76 } 70 }
77 71