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 **************************************************************************/
20 #include "AliMagFCM.h"
25 //________________________________________
26 AliMagFCM::AliMagFCM(const char *name, const char *title, const Int_t integ,
27 const Int_t map, const Float_t factor, const Float_t fmax)
28 : AliMagF(name,title,integ,map,factor,fmax)
31 // Standard constructor
34 printf("Constant Mesh Field %s created: map= %d, factor= %f, file= %s\n",
35 fName.Data(),map,factor,fTitle.Data());
38 //________________________________________
39 AliMagFCM::AliMagFCM(const AliMagFCM &magf)
47 //________________________________________
48 void AliMagFCM::Field(Float_t *x, Float_t *b)
51 // Method to calculate the magnetic field
53 Double_t ratx, raty, ratz, hix, hiy, hiz, ratx1, raty1, ratz1,
54 bhyhz, bhylz, blyhz, blylz, bhz, blz, xl[3];
55 const Double_t kone=1;
58 // --- find the position in the grid ---
61 if(-700<x[2] && x[2]<fZbeg && x[0]*x[0]+(x[1]+30)*(x[1]+30) < 560*560) {
64 Bool_t infield=(fZbeg<=x[2] && x[2]<fZbeg+fZdel*(fZn-1)
65 && ( fXbeg <= TMath::Abs(x[0]) && TMath::Abs(x[0]) < fXbeg+fXdel*(fXn-1) )
66 && ( fYbeg <= TMath::Abs(x[1]) && TMath::Abs(x[1]) < fYbeg+fYdel*(fYn-1) ));
68 xl[0]=TMath::Abs(x[0])-fXbeg;
69 xl[1]=TMath::Abs(x[1])-fYbeg;
87 // ... simple interpolation
91 bhyhz = Bx(ix ,iy+1,iz+1)*ratx1+Bx(ix+1,iy+1,iz+1)*ratx;
92 bhylz = Bx(ix ,iy+1,iz )*ratx1+Bx(ix+1,iy+1,iz )*ratx;
93 blyhz = Bx(ix ,iy ,iz+1)*ratx1+Bx(ix+1,iy ,iz+1)*ratx;
94 blylz = Bx(ix ,iy ,iz )*ratx1+Bx(ix+1,iy ,iz )*ratx;
95 bhz = blyhz *raty1+bhyhz *raty;
96 blz = blylz *raty1+bhylz *raty;
97 b[0] = blz *ratz1+bhz *ratz;
99 bhyhz = By(ix ,iy+1,iz+1)*ratx1+By(ix+1,iy+1,iz+1)*ratx;
100 bhylz = By(ix ,iy+1,iz )*ratx1+By(ix+1,iy+1,iz )*ratx;
101 blyhz = By(ix ,iy ,iz+1)*ratx1+By(ix+1,iy ,iz+1)*ratx;
102 blylz = By(ix ,iy ,iz )*ratx1+By(ix+1,iy ,iz )*ratx;
103 bhz = blyhz *raty1+bhyhz *raty;
104 blz = blylz *raty1+bhylz *raty;
105 b[1] = blz *ratz1+bhz *ratz;
107 bhyhz = Bz(ix ,iy+1,iz+1)*ratx1+Bz(ix+1,iy+1,iz+1)*ratx;
108 bhylz = Bz(ix ,iy+1,iz )*ratx1+Bz(ix+1,iy+1,iz )*ratx;
109 blyhz = Bz(ix ,iy ,iz+1)*ratx1+Bz(ix+1,iy ,iz+1)*ratx;
110 blylz = Bz(ix ,iy ,iz )*ratx1+Bz(ix+1,iy ,iz )*ratx;
111 bhz = blyhz *raty1+bhyhz *raty;
112 blz = blylz *raty1+bhylz *raty;
113 b[2] = blz *ratz1+bhz *ratz;
114 //printf("ratx,raty,ratz,b[0],b[1],b[2] %f %f %f %f %f %f\n",
115 //ratx,raty,ratz,b[0],b[1],b[2]);
117 // ... use the dipole symmetry
118 if (x[0]*x[1] < 0) b[1]=-b[1];
119 if (x[0]<0) b[2]=-b[2];
121 printf("Invalid field map for constant mesh %d\n",fMap);
124 //This is the ZDC part
125 Float_t rad2=x[0]*x[0]+x[1]*x[1];
129 // Separator Dipole D2
130 if(x[2]<kD2END) b[1]=kFDIP;
131 } else if(x[2]>kD1BEG) {
133 // Separator Dipole D1
134 if(x[2]<kD1END) b[1]=-kFDIP;
138 // First quadrupole of inner triplet de-focussing in x-direction
147 } else if(x[2]>kZ3BEG) {
154 } else if(x[2]>kZ2BEG) {
161 } else if(x[2]>kZ1BEG) {
168 } else if(x[2]>kCORBEG) {
170 // Corrector dipole (because of dimuon arm)
185 //________________________________________
186 void AliMagFCM::ReadField()
189 // Method to read the magnetic field map from file
192 Int_t ix, iy, iz, ipx, ipy, ipz;
195 printf("Reading Magnetic Field %s from file %s\n",fName.Data(),fTitle.Data());
196 fname = gSystem->ExpandPathName(fTitle.Data());
197 magfile=fopen(fname,"r");
200 fscanf(magfile,"%d %d %d %f %f %f %f %f %f",
201 &fXn, &fYn, &fZn, &fXdel, &fYdel, &fZdel, &fXbeg, &fYbeg, &fZbeg);
202 printf("fXn %d, fYn %d, fZn %d, fXdel %f, fYdel %f, fZdel %f, fXbeg %f, fYbeg %f, fZbeg %f\n",
203 fXn, fYn, fZn, fXdel, fYdel, fZdel, fXbeg, fYbeg, fZbeg);
207 fB = new TVector(3*fXn*fYn*fZn);
208 for (iz=0; iz<fZn; iz++) {
210 for (iy=0; iy<fYn; iy++) {
212 for (ix=0; ix<fXn; ix++) {
214 fscanf(magfile,"%f %f %f",&bz,&by,&bx);
222 printf("File %s not found !\n",fTitle.Data());
227 //________________________________________
228 void AliMagFCM::Copy(AliMagFCM &magf) const
231 // Copy *this onto magf
233 Fatal("Copy","Not implemented!\n");
236 //________________________________________
237 AliMagFCM & AliMagFCM::operator =(const AliMagFCM &magf)