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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 | ||
16 | /* $Id$ */ | |
17 | ||
18 | //------------------------------------------------------------------------- | |
19 | // Constant magnetic field class | |
20 | // Used by AliRun class | |
21 | // Author: | |
22 | //------------------------------------------------------------------------- | |
23 | ||
24 | #include <stdlib.h> | |
25 | ||
26 | #include "AliLog.h" | |
27 | #include "AliMagFC.h" | |
28 | ||
29 | ClassImp(AliMagFC) | |
30 | ||
31 | //________________________________________ | |
32 | AliMagFC::AliMagFC(const char *name, const char *title, Int_t integ, | |
33 | Float_t factor, Float_t fmax) | |
34 | : AliMagF(name,title,integ,factor,fmax), | |
35 | fCompensator(kFALSE) | |
36 | { | |
37 | // | |
38 | // Standard constructor | |
39 | // | |
40 | fType = kConst; | |
41 | fMap = 1; | |
42 | } | |
43 | ||
44 | //________________________________________ | |
45 | void AliMagFC::Field(Float_t *x, Float_t *b) const | |
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 { | |
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; | |
58 | } | |
59 | else { | |
60 | ZDCField(x, b); | |
61 | } | |
62 | } | |
63 | if(fFactor!=1) { | |
64 | b[0]*=fFactor; | |
65 | b[1]*=fFactor; | |
66 | b[2]*=fFactor; | |
67 | } | |
68 | } else { | |
69 | AliFatal(Form("Invalid field map for constant field %d",fMap)); | |
70 | } | |
71 | } | |
72 | ||
73 | ||
74 | void AliMagFC::ZDCField(Float_t *x, Float_t *b) const | |
75 | { | |
76 | //This is the ZDC part | |
77 | Float_t rad2 = x[0] * x[0] + x[1] * x[1]; | |
78 | ||
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 | ||
88 | if(x[2] < kCORBEG2 && x[2] > kCOREND2){ | |
89 | if(rad2<kCOR2RA2){ | |
90 | b[0] = - kFCORN2; | |
91 | } | |
92 | } | |
93 | else if(x[2] < kZ1BEG && x[2] > kZ1END){ | |
94 | if(rad2<kZ1RA2){ | |
95 | b[0] = kG1*x[1]; | |
96 | b[1] = kG1*x[0]; | |
97 | } | |
98 | } | |
99 | else if(x[2] < kZ2BEG && x[2] > kZ2END){ | |
100 | if(rad2<kZ2RA2){ | |
101 | b[0] = -kG1*x[1]; | |
102 | b[1] = -kG1*x[0]; | |
103 | } | |
104 | } | |
105 | else if(x[2] < kZ3BEG && x[2] > kZ3END){ | |
106 | if(rad2<kZ3RA2){ | |
107 | b[0] = -kG1*x[1]; | |
108 | b[1] = -kG1*x[0]; | |
109 | } | |
110 | } | |
111 | else if(x[2] < kZ4BEG && x[2] > kZ4END){ | |
112 | if(rad2<kZ4RA2){ | |
113 | b[0] = kG1*x[1]; | |
114 | b[1] = kG1*x[0]; | |
115 | } | |
116 | } | |
117 | else if(x[2] < kD1BEG && x[2] > kD1END){ | |
118 | if(rad2<kD1RA2){ | |
119 | b[1] = -kFDIP; | |
120 | } | |
121 | } | |
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 | } | |
127 | } | |
128 | ||
129 | } |