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 1.9 2001/09/04 15:05:13 hristov
19 Pointer fB is initialised to 0 in the default constructor
21 Revision 1.8 2001/05/28 14:10:35 morsch
22 SetSolenoidField method to set the L3 field strength. 2 kG is default.
24 Revision 1.7 2001/05/16 14:57:22 alibrary
25 New files for folders and Stack
27 Revision 1.6 2000/12/18 10:44:01 morsch
28 Possibility to set field map by passing pointer to objet of type AliMagF via
31 gAlice->SetField(new AliMagFCM("Map2", "$(ALICE_ROOT)/data/field01.dat",2,1.,10.));
33 Revision 1.5 2000/12/01 11:20:27 alibrary
34 Corrector dipole removed from ZDC
36 Revision 1.4 2000/11/30 07:12:49 alibrary
37 Introducing new Rndm and QA classes
39 Revision 1.3 2000/11/10 18:09:55 fca
40 New field map for the ZDC
42 Revision 1.2 2000/07/12 08:56:25 fca
43 Coding convention correction and warning removal
45 Revision 1.1 2000/07/11 18:24:59 fca
46 Coding convention corrections + few minor bug fixes
51 #include "AliMagFCM.h"
56 //_______________________________________________________________________
57 AliMagFCM::AliMagFCM():
74 // Standard constructor
81 //_______________________________________________________________________
82 AliMagFCM::AliMagFCM(const char *name, const char *title, const Int_t integ,
83 const Float_t factor, const Float_t fmax):
84 AliMagF(name,title,integ,factor,fmax),
101 // Standard constructor
107 if(fDebug>-1) Info("ctor",
108 "%s: Constant Mesh Field %s created: map= %d, factor= %f, file= %s\n",
109 ClassName(),fName.Data(), fMap, factor,fTitle.Data());
112 //_______________________________________________________________________
113 AliMagFCM::AliMagFCM(const AliMagFCM &magf):
136 //_______________________________________________________________________
137 void AliMagFCM::Field(Float_t *x, Float_t *b)
140 // Method to calculate the magnetic field
142 Double_t ratx, raty, ratz, hix, hiy, hiz, ratx1, raty1, ratz1,
143 bhyhz, bhylz, blyhz, blylz, bhz, blz, xl[3];
144 const Double_t kone=1;
147 // --- find the position in the grid ---
150 if(-700<x[2] && x[2]<fZbeg && x[0]*x[0]+(x[1]+30)*(x[1]+30) < 560*560) {
153 Bool_t infield=(fZbeg<=x[2] && x[2]<fZbeg+fZdel*(fZn-1)
154 && ( fXbeg <= TMath::Abs(x[0]) && TMath::Abs(x[0]) < fXbeg+fXdel*(fXn-1) )
155 && ( fYbeg <= TMath::Abs(x[1]) && TMath::Abs(x[1]) < fYbeg+fYdel*(fYn-1) ));
157 xl[0]=TMath::Abs(x[0])-fXbeg;
158 xl[1]=TMath::Abs(x[1])-fYbeg;
176 // ... simple interpolation
180 bhyhz = Bx(ix ,iy+1,iz+1)*ratx1+Bx(ix+1,iy+1,iz+1)*ratx;
181 bhylz = Bx(ix ,iy+1,iz )*ratx1+Bx(ix+1,iy+1,iz )*ratx;
182 blyhz = Bx(ix ,iy ,iz+1)*ratx1+Bx(ix+1,iy ,iz+1)*ratx;
183 blylz = Bx(ix ,iy ,iz )*ratx1+Bx(ix+1,iy ,iz )*ratx;
184 bhz = blyhz *raty1+bhyhz *raty;
185 blz = blylz *raty1+bhylz *raty;
186 b[0] = blz *ratz1+bhz *ratz;
188 bhyhz = By(ix ,iy+1,iz+1)*ratx1+By(ix+1,iy+1,iz+1)*ratx;
189 bhylz = By(ix ,iy+1,iz )*ratx1+By(ix+1,iy+1,iz )*ratx;
190 blyhz = By(ix ,iy ,iz+1)*ratx1+By(ix+1,iy ,iz+1)*ratx;
191 blylz = By(ix ,iy ,iz )*ratx1+By(ix+1,iy ,iz )*ratx;
192 bhz = blyhz *raty1+bhyhz *raty;
193 blz = blylz *raty1+bhylz *raty;
194 b[1] = blz *ratz1+bhz *ratz;
196 bhyhz = Bz(ix ,iy+1,iz+1)*ratx1+Bz(ix+1,iy+1,iz+1)*ratx;
197 bhylz = Bz(ix ,iy+1,iz )*ratx1+Bz(ix+1,iy+1,iz )*ratx;
198 blyhz = Bz(ix ,iy ,iz+1)*ratx1+Bz(ix+1,iy ,iz+1)*ratx;
199 blylz = Bz(ix ,iy ,iz )*ratx1+Bz(ix+1,iy ,iz )*ratx;
200 bhz = blyhz *raty1+bhyhz *raty;
201 blz = blylz *raty1+bhylz *raty;
202 b[2] = blz *ratz1+bhz *ratz;
203 //printf("ratx,raty,ratz,b[0],b[1],b[2] %f %f %f %f %f %f\n",
204 //ratx,raty,ratz,b[0],b[1],b[2]);
206 // ... use the dipole symmetry
207 if (x[0]*x[1] < 0) b[1]=-b[1];
208 if (x[0]<0) b[2]=-b[2];
210 printf("Invalid field map for constant mesh %d\n",fMap);
213 //This is the ZDC part
214 Float_t rad2=x[0]*x[0]+x[1]*x[1];
215 if(x[2]>kCORBEG2 && x[2]<kCOREND2){
220 else if(x[2]>kZ1BEG && x[2]<kZ1END){
226 else if(x[2]>kZ2BEG && x[2]<kZ2END){
232 else if(x[2]>kZ3BEG && x[2]<kZ3END){
238 else if(x[2]>kZ4BEG && x[2]<kZ4END){
244 else if(x[2]>kD1BEG && x[2]<kD1END){
249 else if(x[2]>kD2BEG && x[2]<kD2END){
250 if(((x[0]-kXCEN1D2)*(x[0]-kXCEN1D2)+(x[1]-kYCEN1D2)*(x[1]-kYCEN1D2))<kD2RA2
251 || ((x[0]-kXCEN2D2)*(x[0]-kXCEN2D2)+(x[1]-kYCEN2D2)*(x[1]-kYCEN2D2))<kD2RA2){
265 //_______________________________________________________________________
266 void AliMagFCM::ReadField()
269 // Method to read the magnetic field map from file
272 Int_t ix, iy, iz, ipx, ipy, ipz;
275 if(fDebug) printf("%s: Reading Magnetic Field %s from file %s\n",ClassName(),fName.Data(),fTitle.Data());
276 fname = gSystem->ExpandPathName(fTitle.Data());
277 magfile=fopen(fname,"r");
280 fscanf(magfile,"%d %d %d %f %f %f %f %f %f",
281 &fXn, &fYn, &fZn, &fXdel, &fYdel, &fZdel, &fXbeg, &fYbeg, &fZbeg);
282 if(fDebug>1) printf("%s: fXn %d, fYn %d, fZn %d, fXdel %f, fYdel %f, fZdel %f, fXbeg %f, fYbeg %f, fZbeg %f\n",
283 ClassName(),fXn, fYn, fZn, fXdel, fYdel, fZdel, fXbeg, fYbeg, fZbeg);
287 fB = new TVector(3*fXn*fYn*fZn);
288 for (iz=0; iz<fZn; iz++) {
290 for (iy=0; iy<fYn; iy++) {
292 for (ix=0; ix<fXn; ix++) {
294 fscanf(magfile,"%f %f %f",&bz,&by,&bx);
302 printf("%s: File %s not found !\n",ClassName(),fTitle.Data());
307 //_______________________________________________________________________
308 void AliMagFCM::Copy(AliMagFCM & /* magf */) const
311 // Copy *this onto magf -- Not implemented
313 Fatal("Copy","Not implemented!\n");