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 1.4 2000/11/30 07:12:49 alibrary
19 Introducing new Rndm and QA classes
21 Revision 1.3 2000/11/10 18:09:55 fca
22 New field map for the ZDC
24 Revision 1.2 2000/07/12 08:56:25 fca
25 Coding convention correction and warning removal
27 Revision 1.1 2000/07/11 18:24:59 fca
28 Coding convention corrections + few minor bug fixes
33 #include "AliMagFCM.h"
38 //________________________________________
39 AliMagFCM::AliMagFCM(const char *name, const char *title, const Int_t integ,
40 const Int_t map, const Float_t factor, const Float_t fmax)
41 : AliMagF(name,title,integ,map,factor,fmax)
44 // Standard constructor
47 printf("Constant Mesh Field %s created: map= %d, factor= %f, file= %s\n",
48 fName.Data(),map,factor,fTitle.Data());
51 //________________________________________
52 AliMagFCM::AliMagFCM(const AliMagFCM &magf)
60 //________________________________________
61 void AliMagFCM::Field(Float_t *x, Float_t *b)
64 // Method to calculate the magnetic field
66 Double_t ratx, raty, ratz, hix, hiy, hiz, ratx1, raty1, ratz1,
67 bhyhz, bhylz, blyhz, blylz, bhz, blz, xl[3];
68 const Double_t kone=1;
71 // --- find the position in the grid ---
74 if(-700<x[2] && x[2]<fZbeg && x[0]*x[0]+(x[1]+30)*(x[1]+30) < 560*560) {
77 Bool_t infield=(fZbeg<=x[2] && x[2]<fZbeg+fZdel*(fZn-1)
78 && ( fXbeg <= TMath::Abs(x[0]) && TMath::Abs(x[0]) < fXbeg+fXdel*(fXn-1) )
79 && ( fYbeg <= TMath::Abs(x[1]) && TMath::Abs(x[1]) < fYbeg+fYdel*(fYn-1) ));
81 xl[0]=TMath::Abs(x[0])-fXbeg;
82 xl[1]=TMath::Abs(x[1])-fYbeg;
100 // ... simple interpolation
104 bhyhz = Bx(ix ,iy+1,iz+1)*ratx1+Bx(ix+1,iy+1,iz+1)*ratx;
105 bhylz = Bx(ix ,iy+1,iz )*ratx1+Bx(ix+1,iy+1,iz )*ratx;
106 blyhz = Bx(ix ,iy ,iz+1)*ratx1+Bx(ix+1,iy ,iz+1)*ratx;
107 blylz = Bx(ix ,iy ,iz )*ratx1+Bx(ix+1,iy ,iz )*ratx;
108 bhz = blyhz *raty1+bhyhz *raty;
109 blz = blylz *raty1+bhylz *raty;
110 b[0] = blz *ratz1+bhz *ratz;
112 bhyhz = By(ix ,iy+1,iz+1)*ratx1+By(ix+1,iy+1,iz+1)*ratx;
113 bhylz = By(ix ,iy+1,iz )*ratx1+By(ix+1,iy+1,iz )*ratx;
114 blyhz = By(ix ,iy ,iz+1)*ratx1+By(ix+1,iy ,iz+1)*ratx;
115 blylz = By(ix ,iy ,iz )*ratx1+By(ix+1,iy ,iz )*ratx;
116 bhz = blyhz *raty1+bhyhz *raty;
117 blz = blylz *raty1+bhylz *raty;
118 b[1] = blz *ratz1+bhz *ratz;
120 bhyhz = Bz(ix ,iy+1,iz+1)*ratx1+Bz(ix+1,iy+1,iz+1)*ratx;
121 bhylz = Bz(ix ,iy+1,iz )*ratx1+Bz(ix+1,iy+1,iz )*ratx;
122 blyhz = Bz(ix ,iy ,iz+1)*ratx1+Bz(ix+1,iy ,iz+1)*ratx;
123 blylz = Bz(ix ,iy ,iz )*ratx1+Bz(ix+1,iy ,iz )*ratx;
124 bhz = blyhz *raty1+bhyhz *raty;
125 blz = blylz *raty1+bhylz *raty;
126 b[2] = blz *ratz1+bhz *ratz;
127 //printf("ratx,raty,ratz,b[0],b[1],b[2] %f %f %f %f %f %f\n",
128 //ratx,raty,ratz,b[0],b[1],b[2]);
130 // ... use the dipole symmetry
131 if (x[0]*x[1] < 0) b[1]=-b[1];
132 if (x[0]<0) b[2]=-b[2];
134 printf("Invalid field map for constant mesh %d\n",fMap);
137 //This is the ZDC part
138 Float_t rad2=x[0]*x[0]+x[1]*x[1];
139 if(x[2]>kCORBEG2 && x[2]<kCOREND2){
144 else if(x[2]>kZ1BEG && x[2]<kZ1END){
150 else if(x[2]>kZ2BEG && x[2]<kZ2END){
156 else if(x[2]>kZ3BEG && x[2]<kZ3END){
162 else if(x[2]>kZ4BEG && x[2]<kZ4END){
168 else if(x[2]>kD1BEG && x[2]<kD1END){
173 else if(x[2]>kD2BEG && x[2]<kD2END){
174 if(((x[0]-kXCEN1D2)*(x[0]-kXCEN1D2)+(x[1]-kYCEN1D2)*(x[1]-kYCEN1D2))<kD2RA2
175 || ((x[0]-kXCEN2D2)*(x[0]-kXCEN2D2)+(x[1]-kYCEN2D2)*(x[1]-kYCEN2D2))<kD2RA2){
189 //________________________________________
190 void AliMagFCM::ReadField()
193 // Method to read the magnetic field map from file
196 Int_t ix, iy, iz, ipx, ipy, ipz;
199 printf("Reading Magnetic Field %s from file %s\n",fName.Data(),fTitle.Data());
200 fname = gSystem->ExpandPathName(fTitle.Data());
201 magfile=fopen(fname,"r");
204 fscanf(magfile,"%d %d %d %f %f %f %f %f %f",
205 &fXn, &fYn, &fZn, &fXdel, &fYdel, &fZdel, &fXbeg, &fYbeg, &fZbeg);
206 printf("fXn %d, fYn %d, fZn %d, fXdel %f, fYdel %f, fZdel %f, fXbeg %f, fYbeg %f, fZbeg %f\n",
207 fXn, fYn, fZn, fXdel, fYdel, fZdel, fXbeg, fYbeg, fZbeg);
211 fB = new TVector(3*fXn*fYn*fZn);
212 for (iz=0; iz<fZn; iz++) {
214 for (iy=0; iy<fYn; iy++) {
216 for (ix=0; ix<fXn; ix++) {
218 fscanf(magfile,"%f %f %f",&bz,&by,&bx);
226 printf("File %s not found !\n",fTitle.Data());
231 //________________________________________
232 void AliMagFCM::Copy(AliMagFCM & /* magf */) const
235 // Copy *this onto magf -- Not implemented
237 Fatal("Copy","Not implemented!\n");
240 //________________________________________
241 AliMagFCM & AliMagFCM::operator =(const AliMagFCM &magf)