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 1.2 2002/02/22 14:00:20 morsch
19 Protection against replication of fieldmap data in gAlice.
21 Revision 1.1 2002/02/14 11:41:28 morsch
22 Magnetic field map for ALICE for L3+muon spectrometer stored in 3 seperate
28 // Author: Andreas Morsch <andreas.morsch@cern.ch>
32 #include "AliFieldMap.h"
37 //________________________________________
38 AliFieldMap::AliFieldMap()
41 // Standard constructor
47 AliFieldMap::AliFieldMap(const char *name, const char *title)
51 // Standard constructor
58 AliFieldMap::~AliFieldMap()
66 //________________________________________
67 AliFieldMap::AliFieldMap(const AliFieldMap &map)
75 //________________________________________
76 void AliFieldMap::ReadField()
79 // Method to read the magnetic field map from file
82 // FILE* endf = fopen("end.table", "r");
83 // FILE* out = fopen("out", "w");
85 Int_t ix, iy, iz, ipx, ipy, ipz;
88 printf("%s: Reading Magnetic Field Map %s from file %s\n",
89 ClassName(),fName.Data(),fTitle.Data());
91 fname = gSystem->ExpandPathName(fTitle.Data());
92 magfile = fopen(fname,"r");
95 fscanf(magfile,"%d %d %d %f %f %f %f %f %f",
96 &fXn, &fYn, &fZn, &fXbeg, &fYbeg, &fZbeg, &fXdel, &fYdel, &fZdel);
101 fXend = fXbeg + (fXn-1)*fXdel;
102 fYend = fYbeg + (fYn-1)*fYdel;
103 fZend = fZbeg + (fZn-1)*fZdel;
105 Int_t nDim = fXn*fYn*fZn;
109 fB = new TVector(3*nDim);
111 for (ix = 0; ix < fXn; ix++) {
113 for (iy = 0; iy < fYn; iy++) {
115 for (iz = 0; iz < fZn; iz++) {
119 // fscanf(endf,"%f %f %f", &bx,&by,&bz);
120 } else if (iz > -1) {
121 fscanf(magfile," %f %f %f", &bx, &by, &bz);
126 // fscanf(magfile,"%f %f %f %f %f %f %f ",
127 // &x, &y, &z, &bx,&by,&bz, &b);
128 // fprintf(out, "%15.8e %15.8e %15.8e \n", bx, by, bz);
130 (*fB)(ipz+2) = 10.*bz;
131 (*fB)(ipz+1) = 10.*by;
132 (*fB)(ipz ) = 10.*bx;
138 // this part for interpolation between z = 700 and 720 cm to get
141 for (ix = 0; ix < fXn; ix++) {
143 for (iy = 0; iy < fYn; iy++) {
145 Float_t bxx = (Bx(ix,iy,0) + Bx(ix,iy,2))/2.;
146 Float_t byy = (By(ix,iy,0) + By(ix,iy,2))/2.;
147 Float_t bzz = (Bz(ix,iy,0) + Bz(ix,iy,2))/2.;
156 printf("%s: File %s not found !\n",ClassName(),fTitle.Data());
161 void AliFieldMap::Field(Float_t *x, Float_t *b)
164 // Use simple interpolation to obtain field at point x
166 Double_t ratx, raty, ratz, hix, hiy, hiz, ratx1, raty1, ratz1,
167 bhyhz, bhylz, blyhz, blylz, bhz, blz, xl[3];
168 const Double_t kone=1;
173 xl[0]=TMath::Abs(x[0])-fXbeg;
174 xl[1]=TMath::Abs(x[1])-fYbeg;
193 bhyhz = Bx(ix ,iy+1,iz+1)*ratx1+Bx(ix+1,iy+1,iz+1)*ratx;
194 bhylz = Bx(ix ,iy+1,iz )*ratx1+Bx(ix+1,iy+1,iz )*ratx;
195 blyhz = Bx(ix ,iy ,iz+1)*ratx1+Bx(ix+1,iy ,iz+1)*ratx;
196 blylz = Bx(ix ,iy ,iz )*ratx1+Bx(ix+1,iy ,iz )*ratx;
197 bhz = blyhz *raty1+bhyhz *raty;
198 blz = blylz *raty1+bhylz *raty;
199 b[0] = blz *ratz1+bhz *ratz;
201 bhyhz = By(ix ,iy+1,iz+1)*ratx1+By(ix+1,iy+1,iz+1)*ratx;
202 bhylz = By(ix ,iy+1,iz )*ratx1+By(ix+1,iy+1,iz )*ratx;
203 blyhz = By(ix ,iy ,iz+1)*ratx1+By(ix+1,iy ,iz+1)*ratx;
204 blylz = By(ix ,iy ,iz )*ratx1+By(ix+1,iy ,iz )*ratx;
205 bhz = blyhz *raty1+bhyhz *raty;
206 blz = blylz *raty1+bhylz *raty;
207 b[1] = blz *ratz1+bhz *ratz;
209 bhyhz = Bz(ix ,iy+1,iz+1)*ratx1+Bz(ix+1,iy+1,iz+1)*ratx;
210 bhylz = Bz(ix ,iy+1,iz )*ratx1+Bz(ix+1,iy+1,iz )*ratx;
211 blyhz = Bz(ix ,iy ,iz+1)*ratx1+Bz(ix+1,iy ,iz+1)*ratx;
212 blylz = Bz(ix ,iy ,iz )*ratx1+Bz(ix+1,iy ,iz )*ratx;
213 bhz = blyhz *raty1+bhyhz *raty;
214 blz = blylz *raty1+bhylz *raty;
215 b[2] = blz *ratz1+bhz *ratz;
218 //________________________________________
219 void AliFieldMap::Copy(AliFieldMap & /* magf */) const
222 // Copy *this onto magf -- Not implemented
224 Fatal("Copy","Not implemented!\n");
227 //________________________________________
228 AliFieldMap & AliFieldMap::operator =(const AliFieldMap &magf)
234 void AliFieldMap::Streamer(TBuffer &R__b)
236 // Stream an object of class AliFieldMap.
239 if (R__b.IsReading()) {
240 AliFieldMap::Class()->ReadBuffer(R__b, this);
246 AliFieldMap::Class()->WriteBuffer(R__b, this);
247 if (!fWriteEnable) fB = save;