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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 | |
594d8990 | 26 | #include "AliLog.h" |
aee8290b | 27 | #include "AliMagFC.h" |
28 | ||
29 | ClassImp(AliMagFC) | |
30 | ||
31 | //________________________________________ | |
d0f1ee3b | 32 | AliMagFC::AliMagFC(const char *name, const char *title, Int_t integ, |
33 | Float_t factor, Float_t fmax) | |
c28c3a0b | 34 | : AliMagF(name,title,integ,factor,fmax), |
35 | fCompensator(kFALSE) | |
aee8290b | 36 | { |
37 | // | |
38 | // Standard constructor | |
39 | // | |
aee8290b | 40 | fType = kConst; |
d8408e76 | 41 | fMap = 1; |
aee8290b | 42 | } |
43 | ||
44 | //________________________________________ | |
6f3038e9 | 45 | void AliMagFC::Field(Float_t *x, Float_t *b) const |
aee8290b | 46 | { |
47 | // | |
48 | // Method to return the field in a point | |
49 | // | |
50 | b[0]=b[1]=b[2]=0; | |
51 | if(fMap==1) { | |
52 | if(TMath::Abs(x[2])<700 && x[0]*x[0]+(x[1]+30)*(x[1]+30) < 560*560) { | |
53 | b[2]=2; | |
54 | } else { | |
575c700d | 55 | if ( -725 >= x[2] && x[2] >= -1225 ) { |
56 | Float_t dz = TMath::Abs(-975-x[2])*0.01; | |
57 | b[0] = - (1-0.1*dz*dz)*7; | |
aee8290b | 58 | } |
59 | else { | |
575c700d | 60 | ZDCField(x, b); |
d95ea23f | 61 | } |
62 | } | |
575c700d | 63 | if(fFactor!=1) { |
64 | b[0]*=fFactor; | |
65 | b[1]*=fFactor; | |
66 | b[2]*=fFactor; | |
d95ea23f | 67 | } |
575c700d | 68 | } else { |
594d8990 | 69 | AliFatal(Form("Invalid field map for constant field %d",fMap)); |
575c700d | 70 | } |
71 | } | |
72 | ||
73 | ||
6f3038e9 | 74 | void AliMagFC::ZDCField(Float_t *x, Float_t *b) const |
575c700d | 75 | { |
76 | //This is the ZDC part | |
c28c3a0b | 77 | Float_t rad2 = x[0] * x[0] + x[1] * x[1]; |
2e9eb88a | 78 | |
c28c3a0b | 79 | if (fCompensator && (x[2] > 919. && x[2] < 1231.) && rad2 < 16.) { |
80 | // Compensator magnet at z = 1075 m | |
81 | b[0] = 10.9; | |
82 | b[1] = 0.; | |
83 | b[2] = 0.; | |
84 | return; | |
85 | } | |
86 | ||
87 | ||
575c700d | 88 | if(x[2] < kCORBEG2 && x[2] > kCOREND2){ |
89 | if(rad2<kCOR2RA2){ | |
90 | b[0] = - kFCORN2; | |
91 | } | |
d95ea23f | 92 | } |
575c700d | 93 | else if(x[2] < kZ1BEG && x[2] > kZ1END){ |
94 | if(rad2<kZ1RA2){ | |
95 | b[0] = kG1*x[1]; | |
53cc0d31 | 96 | b[1] = kG1*x[0]; |
575c700d | 97 | } |
d95ea23f | 98 | } |
575c700d | 99 | else if(x[2] < kZ2BEG && x[2] > kZ2END){ |
100 | if(rad2<kZ2RA2){ | |
101 | b[0] = -kG1*x[1]; | |
53cc0d31 | 102 | b[1] = -kG1*x[0]; |
575c700d | 103 | } |
d95ea23f | 104 | } |
575c700d | 105 | else if(x[2] < kZ3BEG && x[2] > kZ3END){ |
106 | if(rad2<kZ3RA2){ | |
107 | b[0] = -kG1*x[1]; | |
53cc0d31 | 108 | b[1] = -kG1*x[0]; |
575c700d | 109 | } |
d95ea23f | 110 | } |
575c700d | 111 | else if(x[2] < kZ4BEG && x[2] > kZ4END){ |
112 | if(rad2<kZ4RA2){ | |
113 | b[0] = kG1*x[1]; | |
53cc0d31 | 114 | b[1] = kG1*x[0]; |
575c700d | 115 | } |
d95ea23f | 116 | } |
575c700d | 117 | else if(x[2] < kD1BEG && x[2] > kD1END){ |
118 | if(rad2<kD1RA2){ | |
119 | b[1] = -kFDIP; | |
120 | } | |
aee8290b | 121 | } |
575c700d | 122 | else if(x[2] < kD2BEG && x[2] > kD2END){ |
123 | if(((x[0]-kXCEN1D2)*(x[0]-kXCEN1D2)+(x[1]-kYCEN1D2)*(x[1]-kYCEN1D2))<kD2RA2 | |
124 | || ((x[0]-kXCEN2D2)*(x[0]-kXCEN2D2)+(x[1]-kYCEN2D2)*(x[1]-kYCEN2D2))<kD2RA2){ | |
125 | b[1] = kFDIP; | |
126 | } | |
aee8290b | 127 | } |
575c700d | 128 | |
5ba7c883 | 129 | // *************************** LEFT LINE *********************************************** |
130 | ||
131 | if(x[2] > kCORBEG2l && x[2] < kCOREND2l){ | |
132 | if(rad2<kCOR2RA2l){ | |
133 | b[0] = kFCORN2l; | |
134 | } | |
135 | } | |
136 | else if(x[2] > kZ1BEGl && x[2] < kZ1ENDl){ | |
137 | if(rad2<kZ1RA2l){ | |
138 | // First quadrupole of inner triplet de-focussing in x-direction | |
139 | b[0] = -kG1l*x[1]; | |
140 | b[1] = -kG1l*x[0]; | |
141 | } | |
142 | } | |
143 | else if(x[2] > kZ2BEGl && x[2] < kZ2ENDl){ | |
144 | if(rad2<kZ2RA2l){ | |
145 | b[0] = kG1l*x[1]; | |
146 | b[1] = kG1l*x[0]; | |
147 | } | |
148 | } | |
149 | else if(x[2] > kZ3BEGl && x[2] < kZ3ENDl){ | |
150 | if(rad2<kZ3RA2l){ | |
151 | b[0] = kG1l*x[1]; | |
152 | b[1] = kG1l*x[0]; | |
153 | } | |
154 | } | |
155 | else if(x[2] > kZ4BEGl && x[2] < kZ4ENDl){ | |
156 | if(rad2<kZ4RA2l){ | |
157 | b[0] = -kG1l*x[1]; | |
158 | b[1] = -kG1l*x[0]; | |
159 | } | |
160 | } | |
161 | else if(x[2] > kD1BEGl && x[2] < kD1ENDl){ | |
162 | if(rad2<kD1RA2l){ | |
163 | b[1] = kFDIPl; | |
164 | } | |
165 | } | |
166 | else if(x[2] > kD2BEGl && x[2] < kD2ENDl){ | |
167 | if(((x[0]-kXCEN1D2l)*(x[0]-kXCEN1D2l)+(x[1]-kYCEN1D2l)*(x[1]-kYCEN1D2l))<kD2RA2l | |
168 | || ((x[0]-kXCEN2D2l)*(x[0]-kXCEN2D2l)+(x[1]-kYCEN2D2l)*(x[1]-kYCEN2D2l))<kD2RA2l){ | |
169 | b[1] = -kFDIPl; | |
170 | } | |
171 | } | |
172 | ||
aee8290b | 173 | } |