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 Revision 1.5 2002/10/14 14:57:32 hristov
19 Merging the VirtualMC branch to the main development branch (HEAD)
21 Revision 1.3.6.1 2002/07/24 10:08:13 alibrary
24 Revision 1.4 2002/07/10 15:06:22 morsch
25 Initialize TVector* save.
27 Revision 1.3 2002/02/26 16:13:07 morsch
28 Correction in streamer.
30 Revision 1.2 2002/02/22 14:00:20 morsch
31 Protection against replication of fieldmap data in gAlice.
33 Revision 1.1 2002/02/14 11:41:28 morsch
34 Magnetic field map for ALICE for L3+muon spectrometer stored in 3 seperate
40 // Author: Andreas Morsch <andreas.morsch@cern.ch>
44 #include "AliFieldMap.h"
49 //_______________________________________________________________________
50 AliFieldMap::AliFieldMap():
70 // Standard constructor
75 //_______________________________________________________________________
76 AliFieldMap::AliFieldMap(const char *name, const char *title):
97 // Standard constructor
103 //_______________________________________________________________________
104 AliFieldMap::~AliFieldMap()
112 //_______________________________________________________________________
113 AliFieldMap::AliFieldMap(const AliFieldMap &map):
139 //_______________________________________________________________________
140 void AliFieldMap::ReadField()
143 // Method to read the magnetic field map from file
146 // FILE* endf = fopen("end.table", "r");
147 // FILE* out = fopen("out", "w");
149 Int_t ix, iy, iz, ipx, ipy, ipz;
152 printf("%s: Reading Magnetic Field Map %s from file %s\n",
153 ClassName(),fName.Data(),fTitle.Data());
155 fname = gSystem->ExpandPathName(fTitle.Data());
156 magfile = fopen(fname,"r");
159 fscanf(magfile,"%d %d %d %f %f %f %f %f %f",
160 &fXn, &fYn, &fZn, &fXbeg, &fYbeg, &fZbeg, &fXdel, &fYdel, &fZdel);
165 fXend = fXbeg + (fXn-1)*fXdel;
166 fYend = fYbeg + (fYn-1)*fYdel;
167 fZend = fZbeg + (fZn-1)*fZdel;
169 Int_t nDim = fXn*fYn*fZn;
173 fB = new TVector(3*nDim);
175 for (ix = 0; ix < fXn; ix++) {
177 for (iy = 0; iy < fYn; iy++) {
179 for (iz = 0; iz < fZn; iz++) {
183 // fscanf(endf,"%f %f %f", &bx,&by,&bz);
184 } else if (iz > -1) {
185 fscanf(magfile," %f %f %f", &bx, &by, &bz);
190 // fscanf(magfile,"%f %f %f %f %f %f %f ",
191 // &x, &y, &z, &bx,&by,&bz, &b);
192 // fprintf(out, "%15.8e %15.8e %15.8e \n", bx, by, bz);
194 (*fB)(ipz+2) = 10.*bz;
195 (*fB)(ipz+1) = 10.*by;
196 (*fB)(ipz ) = 10.*bx;
202 // this part for interpolation between z = 700 and 720 cm to get
205 for (ix = 0; ix < fXn; ix++) {
207 for (iy = 0; iy < fYn; iy++) {
209 Float_t bxx = (Bx(ix,iy,0) + Bx(ix,iy,2))/2.;
210 Float_t byy = (By(ix,iy,0) + By(ix,iy,2))/2.;
211 Float_t bzz = (Bz(ix,iy,0) + Bz(ix,iy,2))/2.;
220 printf("%s: File %s not found !\n",ClassName(),fTitle.Data());
225 //_______________________________________________________________________
226 void AliFieldMap::Field(Float_t *x, Float_t *b)
229 // Use simple interpolation to obtain field at point x
231 Double_t ratx, raty, ratz, hix, hiy, hiz, ratx1, raty1, ratz1,
232 bhyhz, bhylz, blyhz, blylz, bhz, blz, xl[3];
233 const Double_t kone=1;
238 xl[0]=TMath::Abs(x[0])-fXbeg;
239 xl[1]=TMath::Abs(x[1])-fYbeg;
258 bhyhz = Bx(ix ,iy+1,iz+1)*ratx1+Bx(ix+1,iy+1,iz+1)*ratx;
259 bhylz = Bx(ix ,iy+1,iz )*ratx1+Bx(ix+1,iy+1,iz )*ratx;
260 blyhz = Bx(ix ,iy ,iz+1)*ratx1+Bx(ix+1,iy ,iz+1)*ratx;
261 blylz = Bx(ix ,iy ,iz )*ratx1+Bx(ix+1,iy ,iz )*ratx;
262 bhz = blyhz *raty1+bhyhz *raty;
263 blz = blylz *raty1+bhylz *raty;
264 b[0] = blz *ratz1+bhz *ratz;
266 bhyhz = By(ix ,iy+1,iz+1)*ratx1+By(ix+1,iy+1,iz+1)*ratx;
267 bhylz = By(ix ,iy+1,iz )*ratx1+By(ix+1,iy+1,iz )*ratx;
268 blyhz = By(ix ,iy ,iz+1)*ratx1+By(ix+1,iy ,iz+1)*ratx;
269 blylz = By(ix ,iy ,iz )*ratx1+By(ix+1,iy ,iz )*ratx;
270 bhz = blyhz *raty1+bhyhz *raty;
271 blz = blylz *raty1+bhylz *raty;
272 b[1] = blz *ratz1+bhz *ratz;
274 bhyhz = Bz(ix ,iy+1,iz+1)*ratx1+Bz(ix+1,iy+1,iz+1)*ratx;
275 bhylz = Bz(ix ,iy+1,iz )*ratx1+Bz(ix+1,iy+1,iz )*ratx;
276 blyhz = Bz(ix ,iy ,iz+1)*ratx1+Bz(ix+1,iy ,iz+1)*ratx;
277 blylz = Bz(ix ,iy ,iz )*ratx1+Bz(ix+1,iy ,iz )*ratx;
278 bhz = blyhz *raty1+bhyhz *raty;
279 blz = blylz *raty1+bhylz *raty;
280 b[2] = blz *ratz1+bhz *ratz;
283 //_______________________________________________________________________
284 void AliFieldMap::Copy(AliFieldMap & /* magf */) const
287 // Copy *this onto magf -- Not implemented
289 Fatal("Copy","Not implemented!\n");
292 //_______________________________________________________________________
293 AliFieldMap & AliFieldMap::operator =(const AliFieldMap &magf)
299 //_______________________________________________________________________
300 void AliFieldMap::Streamer(TBuffer &R__b)
302 // Stream an object of class AliFieldMap.
305 if (R__b.IsReading()) {
306 AliFieldMap::Class()->ReadBuffer(R__b, this);
312 AliFieldMap::Class()->WriteBuffer(R__b, this);
313 if (!fWriteEnable) fB = save;