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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 | // Magnetic field composed by 3 maps: the L3 magnet, extended region, and | |
20 | // dipole magnet | |
21 | // Used in the configuration macros (macros/Config.C, etc.) | |
22 | // Author: Andreas Morsch <andreas.morsch@cern.ch> | |
23 | //------------------------------------------------------------------------ | |
24 | ||
25 | #include <TClass.h> | |
26 | #include <TFile.h> | |
27 | #include <TMath.h> | |
28 | #include <TSystem.h> | |
29 | ||
30 | #include "AliLog.h" | |
31 | #include "AliFieldMap.h" | |
32 | #include "AliMagFMaps.h" | |
33 | ||
34 | ClassImp(AliMagFMaps) | |
35 | ||
36 | ||
37 | //_______________________________________________________________________ | |
38 | AliMagFMaps::AliMagFMaps(): | |
39 | fSolenoid(0), | |
40 | fSolenoidUser(0.), | |
41 | fL3Option(0) | |
42 | { | |
43 | // | |
44 | // Default constructor | |
45 | // | |
46 | // | |
47 | // Don't replicate field information in gAlice | |
48 | fFieldMap[0] = fFieldMap[1] = fFieldMap[2] = 0; | |
49 | } | |
50 | ||
51 | //_______________________________________________________________________ | |
52 | AliMagFMaps::AliMagFMaps(const char *name, const char *title, Int_t integ, | |
53 | Float_t factor, Float_t fmax, Int_t map, | |
54 | Int_t l3): | |
55 | AliMagFC(name,title,integ,factor,fmax), | |
56 | fSolenoid(0), | |
57 | fSolenoidUser(0), | |
58 | fL3Option(l3) | |
59 | { | |
60 | // | |
61 | // Standard constructor | |
62 | // | |
63 | fType = kConMesh; | |
64 | fFieldMap[0] = 0; | |
65 | fMap = map; | |
66 | fL3Option = l3; | |
67 | ReadField(); | |
68 | // | |
69 | // Don't replicate field information in gAlice | |
70 | for (Int_t i = 0; i < 3; i++) fFieldMap[i]->SetWriteEnable(0); | |
71 | // | |
72 | } | |
73 | ||
74 | //_______________________________________________________________________ | |
75 | AliMagFMaps::AliMagFMaps(const AliMagFMaps &magf): | |
76 | AliMagFC(magf), | |
77 | fSolenoid(0), | |
78 | fSolenoidUser(0), | |
79 | fL3Option(0) | |
80 | { | |
81 | // | |
82 | // Copy constructor | |
83 | // | |
84 | magf.Copy(*this); | |
85 | } | |
86 | ||
87 | //_______________________________________________________________________ | |
88 | AliMagFMaps::~AliMagFMaps() | |
89 | { | |
90 | // | |
91 | // Destructor | |
92 | // | |
93 | delete fFieldMap[0]; | |
94 | delete fFieldMap[1]; | |
95 | delete fFieldMap[2]; | |
96 | } | |
97 | ||
98 | //_______________________________________________________________________ | |
99 | void AliMagFMaps::ReadField() | |
100 | { | |
101 | // Read Field Map from file | |
102 | // | |
103 | // don't read twice | |
104 | // | |
105 | if (!fReadField) return; | |
106 | fReadField = kFALSE; | |
107 | // | |
108 | ||
109 | ||
110 | char* fname = 0; | |
111 | TFile* file = 0; | |
112 | if (fMap == k2kG) { | |
113 | fSolenoid = 2.; | |
114 | fname = gSystem->ExpandPathName("$(ALICE_ROOT)/data/maps/L3B02.root"); | |
115 | file = new TFile(fname); | |
116 | fFieldMap[0] = dynamic_cast<AliFieldMap*>(file->Get("L3B02")); | |
117 | file->Close(); | |
118 | delete file; | |
119 | delete [] fname; // see documentation to expand filenam | |
120 | fname = gSystem->ExpandPathName("$(ALICE_ROOT)/data/maps/DipB02.root"); | |
121 | file = new TFile(fname); | |
122 | fFieldMap[1] = dynamic_cast<AliFieldMap*>(file->Get("DipB02")); | |
123 | file->Close(); | |
124 | delete file;; | |
125 | delete [] fname; | |
126 | fname = gSystem->ExpandPathName("$(ALICE_ROOT)/data/maps/ExtB02.root"); | |
127 | file = new TFile(fname); | |
128 | fFieldMap[2] = dynamic_cast<AliFieldMap*>(file->Get("ExtB02")); | |
129 | file->Close(); | |
130 | delete file; | |
131 | delete [] fname; | |
132 | } else if (fMap == k4kG) { | |
133 | fSolenoid = 4.; | |
134 | fname = gSystem->ExpandPathName("$(ALICE_ROOT)/data/maps/L3B04.root"); | |
135 | file = new TFile(fname); | |
136 | fFieldMap[0] = dynamic_cast<AliFieldMap*>(file->Get("L3B04")); | |
137 | file->Close(); | |
138 | delete file; | |
139 | delete [] fname; | |
140 | fname = gSystem->ExpandPathName("$(ALICE_ROOT)/data/maps/DipB04.root"); | |
141 | file = new TFile(fname); | |
142 | fFieldMap[1] = dynamic_cast<AliFieldMap*>(file->Get("DipB04")); | |
143 | file->Close(); | |
144 | delete [] fname; | |
145 | delete file; | |
146 | ||
147 | fname = gSystem->ExpandPathName("$(ALICE_ROOT)/data/maps/ExtB04.root"); | |
148 | file = new TFile(fname); | |
149 | fFieldMap[2] = dynamic_cast<AliFieldMap*>(file->Get("ExtB04")); | |
150 | file->Close(); | |
151 | delete [] fname; | |
152 | delete file; | |
153 | } else if (fMap == k5kG) { | |
154 | fSolenoid = 5.; | |
155 | fname = gSystem->ExpandPathName("$(ALICE_ROOT)/data/maps/L3B05.root"); | |
156 | file = new TFile(fname); | |
157 | fFieldMap[0] = dynamic_cast<AliFieldMap*>(file->Get("L3B05")); | |
158 | file->Close(); | |
159 | delete file; | |
160 | delete [] fname; | |
161 | fname = gSystem->ExpandPathName("$(ALICE_ROOT)/data/maps/DipB05.root"); | |
162 | file = new TFile(fname); | |
163 | fFieldMap[1] = dynamic_cast<AliFieldMap*>(file->Get("DipB05")); | |
164 | file->Close(); | |
165 | delete file; | |
166 | delete [] fname; | |
167 | fname = gSystem->ExpandPathName("$(ALICE_ROOT)/data/maps/ExtB05.root"); | |
168 | file = new TFile(fname); | |
169 | fFieldMap[2] = dynamic_cast<AliFieldMap*>(file->Get("ExtB05")); | |
170 | file->Close(); | |
171 | delete file; | |
172 | delete [] fname; | |
173 | } | |
174 | ||
175 | if (!fL3Option) fSolenoidUser = fSolenoid; | |
176 | ||
177 | } | |
178 | ||
179 | //_______________________________________________________________________ | |
180 | Float_t AliMagFMaps::SolenoidField() const | |
181 | { | |
182 | // | |
183 | // Returns max. L3 (solenoid) field strength | |
184 | // according to field map setting | |
185 | // | |
186 | return -Factor()*fSolenoid; | |
187 | } | |
188 | ||
189 | //_______________________________________________________________________ | |
190 | void AliMagFMaps::Field(Float_t *x, Float_t *b) const | |
191 | { | |
192 | // | |
193 | // Method to calculate the magnetic field | |
194 | // | |
195 | // --- find the position in the grid --- | |
196 | ||
197 | ||
198 | ||
199 | // if (!fFieldRead) ReadField(); | |
200 | ||
201 | // | |
202 | // Field Maps have been calculated for the coordinate system in which | |
203 | // the Muon Spectrometer is placed at z > 0 | |
204 | // Transform coordinates corresponingly | |
205 | // | |
206 | ||
207 | b[0]=b[1]=b[2]=0; | |
208 | Float_t xm[3]; | |
209 | xm[0] = - x[0]; | |
210 | xm[1] = x[1]; | |
211 | xm[2] = - x[2]; | |
212 | ||
213 | AliFieldMap* map = 0; | |
214 | if (fFieldMap[0]->Inside(xm[0], xm[1], xm[2])) { | |
215 | map = fFieldMap[0]; | |
216 | Float_t r = TMath::Sqrt(xm[0] * xm[0] + xm[1] * xm[1]); | |
217 | ||
218 | if (!fL3Option && TMath::Abs(xm[2]) < 370. && r < 550.) { | |
219 | // | |
220 | // Constant L3 field , if this option was selected | |
221 | // | |
222 | b[2] = (- fSolenoid)*fFactor; | |
223 | return; | |
224 | } | |
225 | } else if (fFieldMap[1]->Inside(xm[0], xm[1], xm[2])) { | |
226 | map = fFieldMap[1]; | |
227 | } else if (fFieldMap[2]->Inside(xm[0], xm[1], xm[2])) { | |
228 | map = fFieldMap[2]; | |
229 | } | |
230 | ||
231 | if(map){ | |
232 | map->Field(xm,b); | |
233 | b[0] = - b[0]; | |
234 | b[2] = - b[2]; | |
235 | ||
236 | } else { | |
237 | //This is the ZDC part | |
238 | ZDCField(x, b); | |
239 | } | |
240 | ||
241 | ||
242 | if(fFactor!=1) { | |
243 | b[0]*=fFactor; | |
244 | b[1]*=fFactor; | |
245 | b[2]*=fFactor; | |
246 | } | |
247 | } | |
248 | ||
249 | //_______________________________________________________________________ | |
250 | void AliMagFMaps::Copy(TObject & /* magf */) const | |
251 | { | |
252 | // | |
253 | // Copy *this onto magf -- Not implemented | |
254 | // | |
255 | AliFatal("Not implemented!"); | |
256 | } | |
257 | ||
258 | //_______________________________________________________________________ | |
259 | void AliMagFMaps::Streamer(TBuffer &R__b) | |
260 | { | |
261 | // Stream an object of class AliMagFMaps. | |
262 | if (R__b.IsReading()) { | |
263 | R__b.ReadClassBuffer(AliMagFMaps::Class(), this); | |
264 | // | |
265 | fReadField = kTRUE; | |
266 | ReadField(); | |
267 | } else { | |
268 | R__b.WriteClassBuffer(AliMagFMaps::Class(), this); | |
269 | } | |
270 | } |