1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
18 //------------------------------------------------------------------------
19 // Magnetic field composed by 3 maps: the L3 magnet, extended region, and
21 // Used in the configuration macros (macros/Config.C, etc.)
22 // Author: Andreas Morsch <andreas.morsch@cern.ch>
23 //------------------------------------------------------------------------
28 #include "AliFieldMap.h"
29 #include "AliMagFMaps.h"
34 //_______________________________________________________________________
35 AliMagFMaps::AliMagFMaps():
41 // Default constructor
44 // Don't replicate field information in gAlice
45 fFieldMap[0] = fFieldMap[1] = fFieldMap[2] = 0;
48 //_______________________________________________________________________
49 AliMagFMaps::AliMagFMaps(const char *name, const char *title, Int_t integ,
50 Float_t factor, Float_t fmax, Int_t map,
52 AliMagFC(name,title,integ,factor,fmax),
58 // Standard constructor
66 // Don't replicate field information in gAlice
67 for (Int_t i = 0; i < 3; i++) fFieldMap[i]->SetWriteEnable(0);
71 //_______________________________________________________________________
72 AliMagFMaps::AliMagFMaps(const AliMagFMaps &magf):
83 //_______________________________________________________________________
84 AliMagFMaps::~AliMagFMaps()
94 //_______________________________________________________________________
95 void AliMagFMaps::ReadField()
97 // Read Field Map from file
101 if (!fgReadField) return;
108 fname = gSystem->ExpandPathName("$(ALICE_ROOT)/data/maps/L3B02.root");
109 file = new TFile(fname);
110 fFieldMap[0] = dynamic_cast<AliFieldMap*>(file->Get("L3B02"));
113 fname = gSystem->ExpandPathName("$(ALICE_ROOT)/data/maps/DipB02.root");
114 file = new TFile(fname);
115 fFieldMap[1] = dynamic_cast<AliFieldMap*>(file->Get("DipB02"));
119 fname = gSystem->ExpandPathName("$(ALICE_ROOT)/data/maps/ExtB02.root");
120 file = new TFile(fname);
121 fFieldMap[2] = dynamic_cast<AliFieldMap*>(file->Get("ExtB02"));
124 } else if (fMap == k4kG) {
126 fname = gSystem->ExpandPathName("$(ALICE_ROOT)/data/maps/L3B04.root");
127 file = new TFile(fname);
128 fFieldMap[0] = dynamic_cast<AliFieldMap*>(file->Get("L3B04"));
131 fname = gSystem->ExpandPathName("$(ALICE_ROOT)/data/maps/DipB04.root");
132 file = new TFile(fname);
133 fFieldMap[1] = dynamic_cast<AliFieldMap*>(file->Get("DipB04"));
137 fname = gSystem->ExpandPathName("$(ALICE_ROOT)/data/maps/ExtB04.root");
138 file = new TFile(fname);
139 fFieldMap[2] = dynamic_cast<AliFieldMap*>(file->Get("ExtB04"));
142 } else if (fMap == k5kG) {
144 fname = gSystem->ExpandPathName("$(ALICE_ROOT)/data/maps/L3B05.root");
145 file = new TFile(fname);
146 fFieldMap[0] = dynamic_cast<AliFieldMap*>(file->Get("L3B05"));
149 fname = gSystem->ExpandPathName("$(ALICE_ROOT)/data/maps/DipB05.root");
150 file = new TFile(fname);
151 fFieldMap[1] = dynamic_cast<AliFieldMap*>(file->Get("DipB05"));
155 fname = gSystem->ExpandPathName("$(ALICE_ROOT)/data/maps/ExtB05.root");
156 file = new TFile(fname);
157 fFieldMap[2] = dynamic_cast<AliFieldMap*>(file->Get("ExtB05"));
162 if (!fL3Option) fSolenoidUser = fSolenoid;
166 //_______________________________________________________________________
167 Float_t AliMagFMaps::SolenoidField() const
170 // Returns max. L3 (solenoid) field strength
171 // according to field map setting
176 //_______________________________________________________________________
177 void AliMagFMaps::Field(Float_t *x, Float_t *b) const
180 // Method to calculate the magnetic field
182 // --- find the position in the grid ---
186 // if (!fFieldRead) ReadField();
189 // Field Maps have been calculated for the coordinate system in which
190 // the Muon Spectrometer is placed at z > 0
191 // Transform coordinates corresponingly
200 AliFieldMap* map = 0;
201 if (fFieldMap[0]->Inside(xm[0], xm[1], xm[2])) {
203 Float_t r = TMath::Sqrt(xm[0] * xm[0] + xm[1] * xm[1]);
205 if (!fL3Option && TMath::Abs(xm[2]) < 370. && r < 550.) {
207 // Constant L3 field , if this option was selected
212 } else if (fFieldMap[1]->Inside(xm[0], xm[1], xm[2])) {
214 } else if (fFieldMap[2]->Inside(xm[0], xm[1], xm[2])) {
224 //This is the ZDC part
236 //_______________________________________________________________________
237 void AliMagFMaps::Copy(TObject & /* magf */) const
240 // Copy *this onto magf -- Not implemented
242 Fatal("Copy","Not implemented!\n");
245 //_______________________________________________________________________
246 void AliMagFMaps::Streamer(TBuffer &R__b)
248 // Stream an object of class AliMagFMaps.
249 if (R__b.IsReading()) {
250 AliMagFMaps::Class()->ReadBuffer(R__b, this);
253 AliMagFMaps::Class()->WriteBuffer(R__b, this);