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 2000/12/01 11:20:27 alibrary
19 Corrector dipole removed from ZDC
21 Revision 1.4 2000/11/30 07:12:49 alibrary
22 Introducing new Rndm and QA classes
24 Revision 1.3 2000/11/10 18:09:55 fca
25 New field map for the ZDC
27 Revision 1.2 2000/07/12 08:56:25 fca
28 Coding convention correction and warning removal
30 Revision 1.1 2000/07/11 18:24:59 fca
31 Coding convention corrections + few minor bug fixes
36 #include "AliMagFCM.h"
41 //________________________________________
42 AliMagFCM::AliMagFCM(const char *name, const char *title, const Int_t integ,
43 const Float_t factor, const Float_t fmax)
44 : AliMagF(name,title,integ,factor,fmax)
47 // Standard constructor
52 printf("Constant Mesh Field %s created: map= %d, factor= %f, file= %s\n",
53 fName.Data(), fMap, factor,fTitle.Data());
56 //________________________________________
57 AliMagFCM::AliMagFCM(const AliMagFCM &magf)
65 //________________________________________
66 void AliMagFCM::Field(Float_t *x, Float_t *b)
69 // Method to calculate the magnetic field
71 Double_t ratx, raty, ratz, hix, hiy, hiz, ratx1, raty1, ratz1,
72 bhyhz, bhylz, blyhz, blylz, bhz, blz, xl[3];
73 const Double_t kone=1;
76 // --- find the position in the grid ---
79 if(-700<x[2] && x[2]<fZbeg && x[0]*x[0]+(x[1]+30)*(x[1]+30) < 560*560) {
82 Bool_t infield=(fZbeg<=x[2] && x[2]<fZbeg+fZdel*(fZn-1)
83 && ( fXbeg <= TMath::Abs(x[0]) && TMath::Abs(x[0]) < fXbeg+fXdel*(fXn-1) )
84 && ( fYbeg <= TMath::Abs(x[1]) && TMath::Abs(x[1]) < fYbeg+fYdel*(fYn-1) ));
86 xl[0]=TMath::Abs(x[0])-fXbeg;
87 xl[1]=TMath::Abs(x[1])-fYbeg;
105 // ... simple interpolation
109 bhyhz = Bx(ix ,iy+1,iz+1)*ratx1+Bx(ix+1,iy+1,iz+1)*ratx;
110 bhylz = Bx(ix ,iy+1,iz )*ratx1+Bx(ix+1,iy+1,iz )*ratx;
111 blyhz = Bx(ix ,iy ,iz+1)*ratx1+Bx(ix+1,iy ,iz+1)*ratx;
112 blylz = Bx(ix ,iy ,iz )*ratx1+Bx(ix+1,iy ,iz )*ratx;
113 bhz = blyhz *raty1+bhyhz *raty;
114 blz = blylz *raty1+bhylz *raty;
115 b[0] = blz *ratz1+bhz *ratz;
117 bhyhz = By(ix ,iy+1,iz+1)*ratx1+By(ix+1,iy+1,iz+1)*ratx;
118 bhylz = By(ix ,iy+1,iz )*ratx1+By(ix+1,iy+1,iz )*ratx;
119 blyhz = By(ix ,iy ,iz+1)*ratx1+By(ix+1,iy ,iz+1)*ratx;
120 blylz = By(ix ,iy ,iz )*ratx1+By(ix+1,iy ,iz )*ratx;
121 bhz = blyhz *raty1+bhyhz *raty;
122 blz = blylz *raty1+bhylz *raty;
123 b[1] = blz *ratz1+bhz *ratz;
125 bhyhz = Bz(ix ,iy+1,iz+1)*ratx1+Bz(ix+1,iy+1,iz+1)*ratx;
126 bhylz = Bz(ix ,iy+1,iz )*ratx1+Bz(ix+1,iy+1,iz )*ratx;
127 blyhz = Bz(ix ,iy ,iz+1)*ratx1+Bz(ix+1,iy ,iz+1)*ratx;
128 blylz = Bz(ix ,iy ,iz )*ratx1+Bz(ix+1,iy ,iz )*ratx;
129 bhz = blyhz *raty1+bhyhz *raty;
130 blz = blylz *raty1+bhylz *raty;
131 b[2] = blz *ratz1+bhz *ratz;
132 //printf("ratx,raty,ratz,b[0],b[1],b[2] %f %f %f %f %f %f\n",
133 //ratx,raty,ratz,b[0],b[1],b[2]);
135 // ... use the dipole symmetry
136 if (x[0]*x[1] < 0) b[1]=-b[1];
137 if (x[0]<0) b[2]=-b[2];
139 printf("Invalid field map for constant mesh %d\n",fMap);
142 //This is the ZDC part
143 Float_t rad2=x[0]*x[0]+x[1]*x[1];
144 if(x[2]>kCORBEG2 && x[2]<kCOREND2){
149 else if(x[2]>kZ1BEG && x[2]<kZ1END){
155 else if(x[2]>kZ2BEG && x[2]<kZ2END){
161 else if(x[2]>kZ3BEG && x[2]<kZ3END){
167 else if(x[2]>kZ4BEG && x[2]<kZ4END){
173 else if(x[2]>kD1BEG && x[2]<kD1END){
178 else if(x[2]>kD2BEG && x[2]<kD2END){
179 if(((x[0]-kXCEN1D2)*(x[0]-kXCEN1D2)+(x[1]-kYCEN1D2)*(x[1]-kYCEN1D2))<kD2RA2
180 || ((x[0]-kXCEN2D2)*(x[0]-kXCEN2D2)+(x[1]-kYCEN2D2)*(x[1]-kYCEN2D2))<kD2RA2){
194 //________________________________________
195 void AliMagFCM::ReadField()
198 // Method to read the magnetic field map from file
201 Int_t ix, iy, iz, ipx, ipy, ipz;
204 printf("Reading Magnetic Field %s from file %s\n",fName.Data(),fTitle.Data());
205 fname = gSystem->ExpandPathName(fTitle.Data());
206 magfile=fopen(fname,"r");
209 fscanf(magfile,"%d %d %d %f %f %f %f %f %f",
210 &fXn, &fYn, &fZn, &fXdel, &fYdel, &fZdel, &fXbeg, &fYbeg, &fZbeg);
211 printf("fXn %d, fYn %d, fZn %d, fXdel %f, fYdel %f, fZdel %f, fXbeg %f, fYbeg %f, fZbeg %f\n",
212 fXn, fYn, fZn, fXdel, fYdel, fZdel, fXbeg, fYbeg, fZbeg);
216 fB = new TVector(3*fXn*fYn*fZn);
217 for (iz=0; iz<fZn; iz++) {
219 for (iy=0; iy<fYn; iy++) {
221 for (ix=0; ix<fXn; ix++) {
223 fscanf(magfile,"%f %f %f",&bz,&by,&bx);
231 printf("File %s not found !\n",fTitle.Data());
236 //________________________________________
237 void AliMagFCM::Copy(AliMagFCM & /* magf */) const
240 // Copy *this onto magf -- Not implemented
242 Fatal("Copy","Not implemented!\n");
245 //________________________________________
246 AliMagFCM & AliMagFCM::operator =(const AliMagFCM &magf)