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aee8290b | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
7 | * Permission to use, copy, modify and distribute this software and its * | |
8 | * documentation strictly for non-commercial purposes is hereby granted * | |
9 | * without fee, provided that the above copyright notice appears in all * | |
10 | * copies and that both the copyright notice and this permission notice * | |
11 | * appear in the supporting documentation. The authors make no claims * | |
12 | * about the suitability of this software for any purpose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
15 | ||
acd84897 | 16 | /* $Id$ */ |
d8408e76 | 17 | |
116cbefd | 18 | //------------------------------------------------------------------------- |
116cbefd | 19 | // Constant magnetic field class |
5d8718b8 | 20 | // Used by AliRun class |
21 | // Author: | |
116cbefd | 22 | //------------------------------------------------------------------------- |
23 | ||
fb17acd4 | 24 | #include <stdlib.h> |
aee8290b | 25 | |
26 | #include "AliMagFC.h" | |
27 | ||
28 | ClassImp(AliMagFC) | |
29 | ||
30 | //________________________________________ | |
d0f1ee3b | 31 | AliMagFC::AliMagFC(const char *name, const char *title, Int_t integ, |
32 | Float_t factor, Float_t fmax) | |
d8408e76 | 33 | : AliMagF(name,title,integ,factor,fmax) |
aee8290b | 34 | { |
35 | // | |
36 | // Standard constructor | |
37 | // | |
aee8290b | 38 | fType = kConst; |
d8408e76 | 39 | fMap = 1; |
aee8290b | 40 | } |
41 | ||
42 | //________________________________________ | |
43 | void AliMagFC::Field(Float_t *x, Float_t *b) | |
44 | { | |
45 | // | |
46 | // Method to return the field in a point | |
47 | // | |
48 | b[0]=b[1]=b[2]=0; | |
49 | if(fMap==1) { | |
50 | if(TMath::Abs(x[2])<700 && x[0]*x[0]+(x[1]+30)*(x[1]+30) < 560*560) { | |
51 | b[2]=2; | |
52 | } else { | |
575c700d | 53 | if ( -725 >= x[2] && x[2] >= -1225 ) { |
54 | Float_t dz = TMath::Abs(-975-x[2])*0.01; | |
55 | b[0] = - (1-0.1*dz*dz)*7; | |
aee8290b | 56 | } |
57 | else { | |
575c700d | 58 | ZDCField(x, b); |
d95ea23f | 59 | } |
60 | } | |
575c700d | 61 | if(fFactor!=1) { |
62 | b[0]*=fFactor; | |
63 | b[1]*=fFactor; | |
64 | b[2]*=fFactor; | |
d95ea23f | 65 | } |
575c700d | 66 | } else { |
67 | printf("Invalid field map for constant field %d\n",fMap); | |
68 | exit(1); | |
69 | } | |
70 | } | |
71 | ||
72 | ||
73 | void AliMagFC::ZDCField(Float_t *x, Float_t *b) | |
74 | { | |
75 | //This is the ZDC part | |
76 | Float_t rad2=x[0]*x[0]+x[1]*x[1]; | |
2e9eb88a | 77 | |
575c700d | 78 | if(x[2] < kCORBEG2 && x[2] > kCOREND2){ |
79 | if(rad2<kCOR2RA2){ | |
80 | b[0] = - kFCORN2; | |
81 | } | |
d95ea23f | 82 | } |
575c700d | 83 | else if(x[2] < kZ1BEG && x[2] > kZ1END){ |
84 | if(rad2<kZ1RA2){ | |
85 | b[0] = kG1*x[1]; | |
86 | b[1] = -kG1*x[0]; | |
87 | } | |
d95ea23f | 88 | } |
575c700d | 89 | else if(x[2] < kZ2BEG && x[2] > kZ2END){ |
90 | if(rad2<kZ2RA2){ | |
91 | b[0] = -kG1*x[1]; | |
92 | b[1] = kG1*x[0]; | |
93 | } | |
d95ea23f | 94 | } |
575c700d | 95 | else if(x[2] < kZ3BEG && x[2] > kZ3END){ |
96 | if(rad2<kZ3RA2){ | |
97 | b[0] = -kG1*x[1]; | |
98 | b[1] = kG1*x[0]; | |
99 | } | |
d95ea23f | 100 | } |
575c700d | 101 | else if(x[2] < kZ4BEG && x[2] > kZ4END){ |
102 | if(rad2<kZ4RA2){ | |
103 | b[0] = kG1*x[1]; | |
104 | b[1] = -kG1*x[0]; | |
105 | } | |
d95ea23f | 106 | } |
575c700d | 107 | else if(x[2] < kD1BEG && x[2] > kD1END){ |
108 | if(rad2<kD1RA2){ | |
109 | b[1] = -kFDIP; | |
110 | } | |
aee8290b | 111 | } |
575c700d | 112 | else if(x[2] < kD2BEG && x[2] > kD2END){ |
113 | if(((x[0]-kXCEN1D2)*(x[0]-kXCEN1D2)+(x[1]-kYCEN1D2)*(x[1]-kYCEN1D2))<kD2RA2 | |
114 | || ((x[0]-kXCEN2D2)*(x[0]-kXCEN2D2)+(x[1]-kYCEN2D2)*(x[1]-kYCEN2D2))<kD2RA2){ | |
115 | b[1] = kFDIP; | |
116 | } | |
aee8290b | 117 | } |
575c700d | 118 | |
aee8290b | 119 | } |