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 // Class for Alice magnetic field with constant mesh
20 // Used in the configuration macros (macros/Config.C, etc.)
22 //-----------------------------------------------------------------------
27 #include "AliMagFCM.h"
31 //_______________________________________________________________________
32 AliMagFCM::AliMagFCM():
49 // Standard constructor
56 //_______________________________________________________________________
57 AliMagFCM::AliMagFCM(const char *name, const char *title, const Int_t integ,
58 const Float_t factor, const Float_t fmax):
59 AliMagF(name,title,integ,factor,fmax),
76 // Standard constructor
82 if(fDebug>-1) Info("ctor",
83 "%s: Constant Mesh Field %s created: map= %d, factor= %f, file= %s\n",
84 ClassName(),fName.Data(), fMap, factor,fTitle.Data());
87 //_______________________________________________________________________
88 AliMagFCM::AliMagFCM(const AliMagFCM &magf):
111 //_______________________________________________________________________
112 void AliMagFCM::Field(Float_t *x, Float_t *b)
115 // Method to calculate the magnetic field
117 Double_t ratx, raty, ratz, hix, hiy, hiz, ratx1, raty1, ratz1,
118 bhyhz, bhylz, blyhz, blylz, bhz, blz, xl[3];
119 const Double_t kone=1;
122 // --- find the position in the grid ---
125 if(-700<x[2] && x[2]<fZbeg && x[0]*x[0]+(x[1]+30)*(x[1]+30) < 560*560) {
128 Bool_t infield=(fZbeg<=x[2] && x[2]<fZbeg+fZdel*(fZn-1)
129 && ( fXbeg <= TMath::Abs(x[0]) && TMath::Abs(x[0]) < fXbeg+fXdel*(fXn-1) )
130 && ( fYbeg <= TMath::Abs(x[1]) && TMath::Abs(x[1]) < fYbeg+fYdel*(fYn-1) ));
132 xl[0]=TMath::Abs(x[0])-fXbeg;
133 xl[1]=TMath::Abs(x[1])-fYbeg;
151 // ... simple interpolation
155 bhyhz = Bx(ix ,iy+1,iz+1)*ratx1+Bx(ix+1,iy+1,iz+1)*ratx;
156 bhylz = Bx(ix ,iy+1,iz )*ratx1+Bx(ix+1,iy+1,iz )*ratx;
157 blyhz = Bx(ix ,iy ,iz+1)*ratx1+Bx(ix+1,iy ,iz+1)*ratx;
158 blylz = Bx(ix ,iy ,iz )*ratx1+Bx(ix+1,iy ,iz )*ratx;
159 bhz = blyhz *raty1+bhyhz *raty;
160 blz = blylz *raty1+bhylz *raty;
161 b[0] = blz *ratz1+bhz *ratz;
163 bhyhz = By(ix ,iy+1,iz+1)*ratx1+By(ix+1,iy+1,iz+1)*ratx;
164 bhylz = By(ix ,iy+1,iz )*ratx1+By(ix+1,iy+1,iz )*ratx;
165 blyhz = By(ix ,iy ,iz+1)*ratx1+By(ix+1,iy ,iz+1)*ratx;
166 blylz = By(ix ,iy ,iz )*ratx1+By(ix+1,iy ,iz )*ratx;
167 bhz = blyhz *raty1+bhyhz *raty;
168 blz = blylz *raty1+bhylz *raty;
169 b[1] = blz *ratz1+bhz *ratz;
171 bhyhz = Bz(ix ,iy+1,iz+1)*ratx1+Bz(ix+1,iy+1,iz+1)*ratx;
172 bhylz = Bz(ix ,iy+1,iz )*ratx1+Bz(ix+1,iy+1,iz )*ratx;
173 blyhz = Bz(ix ,iy ,iz+1)*ratx1+Bz(ix+1,iy ,iz+1)*ratx;
174 blylz = Bz(ix ,iy ,iz )*ratx1+Bz(ix+1,iy ,iz )*ratx;
175 bhz = blyhz *raty1+bhyhz *raty;
176 blz = blylz *raty1+bhylz *raty;
177 b[2] = blz *ratz1+bhz *ratz;
178 //printf("ratx,raty,ratz,b[0],b[1],b[2] %f %f %f %f %f %f\n",
179 //ratx,raty,ratz,b[0],b[1],b[2]);
181 // ... use the dipole symmetry
182 if (x[0]*x[1] < 0) b[1]=-b[1];
183 if (x[0]<0) b[2]=-b[2];
185 printf("Invalid field map for constant mesh %d\n",fMap);
188 //This is the ZDC part
189 Float_t rad2=x[0]*x[0]+x[1]*x[1];
190 if(x[2]>kCORBEG2 && x[2]<kCOREND2){
195 else if(x[2]>kZ1BEG && x[2]<kZ1END){
201 else if(x[2]>kZ2BEG && x[2]<kZ2END){
207 else if(x[2]>kZ3BEG && x[2]<kZ3END){
213 else if(x[2]>kZ4BEG && x[2]<kZ4END){
219 else if(x[2]>kD1BEG && x[2]<kD1END){
224 else if(x[2]>kD2BEG && x[2]<kD2END){
225 if(((x[0]-kXCEN1D2)*(x[0]-kXCEN1D2)+(x[1]-kYCEN1D2)*(x[1]-kYCEN1D2))<kD2RA2
226 || ((x[0]-kXCEN2D2)*(x[0]-kXCEN2D2)+(x[1]-kYCEN2D2)*(x[1]-kYCEN2D2))<kD2RA2){
240 //_______________________________________________________________________
241 void AliMagFCM::ReadField()
244 // Method to read the magnetic field map from file
247 Int_t ix, iy, iz, ipx, ipy, ipz;
250 if(fDebug) printf("%s: Reading Magnetic Field %s from file %s\n",ClassName(),fName.Data(),fTitle.Data());
251 fname = gSystem->ExpandPathName(fTitle.Data());
252 magfile=fopen(fname,"r");
255 fscanf(magfile,"%d %d %d %f %f %f %f %f %f",
256 &fXn, &fYn, &fZn, &fXdel, &fYdel, &fZdel, &fXbeg, &fYbeg, &fZbeg);
257 if(fDebug>1) printf("%s: fXn %d, fYn %d, fZn %d, fXdel %f, fYdel %f, fZdel %f, fXbeg %f, fYbeg %f, fZbeg %f\n",
258 ClassName(),fXn, fYn, fZn, fXdel, fYdel, fZdel, fXbeg, fYbeg, fZbeg);
262 fB = new TVector(3*fXn*fYn*fZn);
263 for (iz=0; iz<fZn; iz++) {
265 for (iy=0; iy<fYn; iy++) {
267 for (ix=0; ix<fXn; ix++) {
269 fscanf(magfile,"%f %f %f",&bz,&by,&bx);
277 printf("%s: File %s not found !\n",ClassName(),fTitle.Data());
282 //_______________________________________________________________________
283 void AliMagFCM::Copy(AliMagFCM & /* magf */) const
286 // Copy *this onto magf -- Not implemented
288 Fatal("Copy","Not implemented!\n");