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 1.1 2000/07/11 18:24:59 fca
19 Coding convention corrections + few minor bug fixes
23 #include "AliMagFCM.h"
28 //________________________________________
29 AliMagFCM::AliMagFCM(const char *name, const char *title, const Int_t integ,
30 const Int_t map, const Float_t factor, const Float_t fmax)
31 : AliMagF(name,title,integ,map,factor,fmax)
34 // Standard constructor
37 printf("Constant Mesh Field %s created: map= %d, factor= %f, file= %s\n",
38 fName.Data(),map,factor,fTitle.Data());
41 //________________________________________
42 AliMagFCM::AliMagFCM(const AliMagFCM &magf)
50 //________________________________________
51 void AliMagFCM::Field(Float_t *x, Float_t *b)
54 // Method to calculate the magnetic field
56 Double_t ratx, raty, ratz, hix, hiy, hiz, ratx1, raty1, ratz1,
57 bhyhz, bhylz, blyhz, blylz, bhz, blz, xl[3];
58 const Double_t kone=1;
61 // --- find the position in the grid ---
64 if(-700<x[2] && x[2]<fZbeg && x[0]*x[0]+(x[1]+30)*(x[1]+30) < 560*560) {
67 Bool_t infield=(fZbeg<=x[2] && x[2]<fZbeg+fZdel*(fZn-1)
68 && ( fXbeg <= TMath::Abs(x[0]) && TMath::Abs(x[0]) < fXbeg+fXdel*(fXn-1) )
69 && ( fYbeg <= TMath::Abs(x[1]) && TMath::Abs(x[1]) < fYbeg+fYdel*(fYn-1) ));
71 xl[0]=TMath::Abs(x[0])-fXbeg;
72 xl[1]=TMath::Abs(x[1])-fYbeg;
90 // ... simple interpolation
94 bhyhz = Bx(ix ,iy+1,iz+1)*ratx1+Bx(ix+1,iy+1,iz+1)*ratx;
95 bhylz = Bx(ix ,iy+1,iz )*ratx1+Bx(ix+1,iy+1,iz )*ratx;
96 blyhz = Bx(ix ,iy ,iz+1)*ratx1+Bx(ix+1,iy ,iz+1)*ratx;
97 blylz = Bx(ix ,iy ,iz )*ratx1+Bx(ix+1,iy ,iz )*ratx;
98 bhz = blyhz *raty1+bhyhz *raty;
99 blz = blylz *raty1+bhylz *raty;
100 b[0] = blz *ratz1+bhz *ratz;
102 bhyhz = By(ix ,iy+1,iz+1)*ratx1+By(ix+1,iy+1,iz+1)*ratx;
103 bhylz = By(ix ,iy+1,iz )*ratx1+By(ix+1,iy+1,iz )*ratx;
104 blyhz = By(ix ,iy ,iz+1)*ratx1+By(ix+1,iy ,iz+1)*ratx;
105 blylz = By(ix ,iy ,iz )*ratx1+By(ix+1,iy ,iz )*ratx;
106 bhz = blyhz *raty1+bhyhz *raty;
107 blz = blylz *raty1+bhylz *raty;
108 b[1] = blz *ratz1+bhz *ratz;
110 bhyhz = Bz(ix ,iy+1,iz+1)*ratx1+Bz(ix+1,iy+1,iz+1)*ratx;
111 bhylz = Bz(ix ,iy+1,iz )*ratx1+Bz(ix+1,iy+1,iz )*ratx;
112 blyhz = Bz(ix ,iy ,iz+1)*ratx1+Bz(ix+1,iy ,iz+1)*ratx;
113 blylz = Bz(ix ,iy ,iz )*ratx1+Bz(ix+1,iy ,iz )*ratx;
114 bhz = blyhz *raty1+bhyhz *raty;
115 blz = blylz *raty1+bhylz *raty;
116 b[2] = blz *ratz1+bhz *ratz;
117 //printf("ratx,raty,ratz,b[0],b[1],b[2] %f %f %f %f %f %f\n",
118 //ratx,raty,ratz,b[0],b[1],b[2]);
120 // ... use the dipole symmetry
121 if (x[0]*x[1] < 0) b[1]=-b[1];
122 if (x[0]<0) b[2]=-b[2];
124 printf("Invalid field map for constant mesh %d\n",fMap);
127 //This is the ZDC part
128 Float_t rad2=x[0]*x[0]+x[1]*x[1];
132 // Separator Dipole D2
133 if(x[2]<kD2END) b[1]=kFDIP;
134 } else if(x[2]>kD1BEG) {
136 // Separator Dipole D1
137 if(x[2]<kD1END) b[1]=-kFDIP;
141 // First quadrupole of inner triplet de-focussing in x-direction
150 } else if(x[2]>kZ3BEG) {
157 } else if(x[2]>kZ2BEG) {
164 } else if(x[2]>kZ1BEG) {
171 } else if(x[2]>kCORBEG) {
173 // Corrector dipole (because of dimuon arm)
188 //________________________________________
189 void AliMagFCM::ReadField()
192 // Method to read the magnetic field map from file
195 Int_t ix, iy, iz, ipx, ipy, ipz;
198 printf("Reading Magnetic Field %s from file %s\n",fName.Data(),fTitle.Data());
199 fname = gSystem->ExpandPathName(fTitle.Data());
200 magfile=fopen(fname,"r");
203 fscanf(magfile,"%d %d %d %f %f %f %f %f %f",
204 &fXn, &fYn, &fZn, &fXdel, &fYdel, &fZdel, &fXbeg, &fYbeg, &fZbeg);
205 printf("fXn %d, fYn %d, fZn %d, fXdel %f, fYdel %f, fZdel %f, fXbeg %f, fYbeg %f, fZbeg %f\n",
206 fXn, fYn, fZn, fXdel, fYdel, fZdel, fXbeg, fYbeg, fZbeg);
210 fB = new TVector(3*fXn*fYn*fZn);
211 for (iz=0; iz<fZn; iz++) {
213 for (iy=0; iy<fYn; iy++) {
215 for (ix=0; ix<fXn; ix++) {
217 fscanf(magfile,"%f %f %f",&bz,&by,&bx);
225 printf("File %s not found !\n",fTitle.Data());
230 //________________________________________
231 void AliMagFCM::Copy(AliMagFCM & /* magf */) const
234 // Copy *this onto magf -- Not implemented
236 Fatal("Copy","Not implemented!\n");
239 //________________________________________
240 AliMagFCM & AliMagFCM::operator =(const AliMagFCM &magf)