-
+/**************************************************************************
+ * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
+ * *
+ * Author: The ALICE Off-line Project. *
+ * Contributors are mentioned in the code where appropriate. *
+ * *
+ * Permission to use, copy, modify and distribute this software and its *
+ * documentation strictly for non-commercial purposes is hereby granted *
+ * without fee, provided that the above copyright notice appears in all *
+ * copies and that both the copyright notice and this permission notice *
+ * appear in the supporting documentation. The authors make no claims *
+ * about the suitability of this software for any purpose. It is *
+ * provided "as is" without express or implied warranty. *
+ **************************************************************************/
+
+/* $Id$ */
+
+//----------------------------------------------------------------------
+// Basic magnetic field class
+// Used in all the detectors, and also in the traking classes
+// Author:
+//----------------------------------------------------------------------
+
+#include "AliLog.h"
#include "AliMagF.h"
-#include "TSystem.h"
-#include <stdlib.h>
-#include <stdio.h>
-
-//ZDC part -------------------------------------------------------------------
-
- static const Float_t G1=20.03;
- static const Float_t FDIP=-37.34;
- static const Float_t FDIMU=6.;
- static const Float_t FCORN=11.72;
-//
-// ZBEG Beginning of the inner triplet
-// D1BEG Beginning of separator dipole 1
-// D2BEG Beginning of separator dipole 2
-// CORBEG Corrector dipole beginning (because of dimuon arm)
-//
- static const Float_t CORBEG=1920,COREND=CORBEG+190, CORRA2=4.5*4.5;
-//
- static const Float_t ZBEG=2300;
- static const Float_t Z1BEG=ZBEG+ 0,Z1END=Z1BEG+630,Z1RA2=3.5*3.5;
- static const Float_t Z2BEG=ZBEG+ 880,Z2END=Z2BEG+550,Z2RA2=3.5*3.5;
- static const Float_t Z3BEG=ZBEG+1530,Z3END=Z3BEG+550,Z3RA2=3.5*3.5;
- static const Float_t Z4BEG=ZBEG+2430,Z4END=Z4BEG+630,Z4RA2=3.5*3.5;
- static const Float_t D1BEG=5843.5 ,D1END=D1BEG+945,D1RA2=4.5*4.5;
- static const Float_t D2BEG=12113.2 ,D2END=D2BEG+945,D2RA2=4.5*.5;
-
-//ZDC part -------------------------------------------------------------------
-
+Bool_t AliMagF::fgReadField = kTRUE;
ClassImp(AliMagF)
-//________________________________________
-AliMagF::AliMagF(const char *name, const char *title, const Int_t integ, const Int_t map,
- const Float_t factor, const Float_t fmax)
- : TNamed(name,title)
+//_______________________________________________________________________
+AliMagF::AliMagF():
+ fMap(0),
+ fType(0),
+ fInteg(0),
+ fPrecInteg(1),
+ fFactor(0),
+ fMax(0)
{
- fMap = map;
- fType = Undef;
- fInteg = integ;
- fFactor = factor;
- fMax = fmax;
-}
-
-//________________________________________
-void AliMagF::Field(Float_t*, Float_t *b)
-{
- printf("Undefined MagF Field called, returning 0\n");
- b[0]=b[1]=b[2]=0;
+ //
+ // Default constructor
+ //
}
-
-ClassImp(AliMagFC)
-//________________________________________
-AliMagFC::AliMagFC(const char *name, const char *title, const Int_t integ, const Int_t map,
- const Float_t factor, const Float_t fmax)
- : AliMagF(name,title,integ,map,factor,fmax)
+//_______________________________________________________________________
+AliMagF::AliMagF(const char *name, const char *title, Int_t integ,
+ Float_t factor, Float_t fmax):
+ TNamed(name,title),
+ fMap(0),
+ fType(0),
+ fInteg(0),
+ fPrecInteg(1),
+ fFactor(factor),
+ fMax(fmax)
{
- printf("Constant Field %s created: map= %d, factor= %f\n",fName.Data(),map,factor);
- fType = Const;
-}
-
-//________________________________________
-void AliMagFC::Field(Float_t *x, Float_t *b)
-{
- b[0]=b[1]=b[2]=0;
- if(fMap==1) {
- if(TMath::Abs(x[2])<700 && x[0]*x[0]+(x[1]+30)*(x[1]+30) < 560*560) {
- b[2]=2;
+ //
+ // Standard constructor
+ //
+ if(integ<0 || integ > 2) {
+ AliWarning(Form(
+ "Invalid magnetic field flag: %5d; Helix tracking chosen instead"
+ ,integ));
+ fInteg = 2;
} else {
- if ( 725 <= x[2] && x[2] <= 1225 ) {
- Float_t dz = TMath::Abs(975-x[2])*0.01;
- b[0]=(1-0.1*dz*dz)*7;
- }
- else {
-//This is the ZDC part
- Float_t rad2=x[0]*x[0]+x[1]*x[1];
- if(rad2<D2RA2) {
- if(x[2]>D2BEG) {
-
-// Separator Dipole D2
- if(x[2]<D2END) b[1]=FDIP;
- } else if(x[2]>D1BEG) {
-
-// Separator Dipole D1
- if(x[2]<D1END) b[1]=-FDIP;
- }
- if(rad2<CORRA2) {
-
-// First quadrupole of inner triplet de-focussing in x-direction
-// Inner triplet
- if(x[2]>Z4BEG) {
- if(x[2]<Z4END) {
-
-// 2430 <-> 3060
- b[0]=-G1*x[1];
- b[1]=-G1*x[0];
- }
- } else if(x[2]>Z3BEG) {
- if(x[2]<Z3END) {
-
-// 1530 <-> 2080
- b[0]=G1*x[1];
- b[1]=G1*x[0];
- }
- } else if(x[2]>Z2BEG) {
- if(x[2]<Z2END) {
-
-// 890 <-> 1430
- b[0]=G1*x[1];
- b[1]=G1*x[0];
- }
- } else if(x[2]>Z1BEG) {
- if(x[2]<Z1END) {
-
-// 0 <-> 630
- b[0]=-G1*x[1];
- b[1]=-G1*x[0];
- }
- } else if(x[2]>CORBEG) {
- if(x[2]<COREND) {
-// Corrector dipole (because of dimuon arm)
- b[0]=FCORN;
- }
- }
- }
- }
- }
+ fInteg = integ;
}
- } else {
- printf("Invalid field map for constant field %d\n",fMap);
- exit(1);
- }
+ fType = kUndef;
+ //
}
-
-ClassImp(AliMagFCM)
-//________________________________________
-AliMagFCM::AliMagFCM(const char *name, const char *title, const Int_t integ, const Int_t map,
- const Float_t factor, const Float_t fmax)
- : AliMagF(name,title,integ,map,factor,fmax)
+//_______________________________________________________________________
+void AliMagF::Field(Float_t*, Float_t *b) const
{
- fType = ConMesh;
- printf("Constant Mesh Field %s created: map= %d, factor= %f, file= %s\n",fName.Data(),map,factor,fTitle.Data());
-}
-
-//________________________________________
-void AliMagFCM::Field(Float_t *x, Float_t *b)
-{
- Double_t ratx, raty, ratz, hix, hiy, hiz, ratx1, raty1, ratz1,
- bhyhz, bhylz, blyhz, blylz, bhz, blz, xl[3];
- const Double_t one=1;
- Int_t ix, iy, iz;
-
- // --- find the position in the grid ---
-
+ //
+ // Method to return the field in one point -- dummy in this case
+ //
+ AliWarning("Undefined MagF Field called, returning 0");
b[0]=b[1]=b[2]=0;
- if(-700<x[2] && x[2]<fZbeg && x[0]*x[0]+(x[1]+30)*(x[1]+30) < 560*560) {
- b[2]=2;
- } else {
- if(fZbeg<=x[2] && x[2]<fZbeg+fZdel*(fZn-1)
- && ( fXbeg <= TMath::Abs(x[0]) && TMath::Abs(x[0]) < fXbeg+fXdel*(fXn-1) )
- && ( fYbeg <= TMath::Abs(x[1]) && TMath::Abs(x[1]) < fYbeg+fYdel*(fYn-1) )) {
- xl[0]=TMath::Abs(x[0])-fXbeg;
- xl[1]=TMath::Abs(x[1])-fYbeg;
- xl[2]=x[2]-fZbeg;
-
- // --- start with x
-
- hix=xl[0]*fXdeli;
- ratx=hix-int(hix);
- ix=int(hix);
-
- hiy=xl[1]*fYdeli;
- raty=hiy-int(hiy);
- iy=int(hiy);
-
- hiz=xl[2]*fZdeli;
- ratz=hiz-int(hiz);
- iz=int(hiz);
-
- if(fMap==2) {
- // ... simple interpolation
- ratx1=one-ratx;
- raty1=one-raty;
- ratz1=one-ratz;
- bhyhz = Bx(ix ,iy+1,iz+1)*ratx1+Bx(ix+1,iy+1,iz+1)*ratx;
- bhylz = Bx(ix ,iy+1,iz )*ratx1+Bx(ix+1,iy+1,iz )*ratx;
- blyhz = Bx(ix ,iy ,iz+1)*ratx1+Bx(ix+1,iy ,iz+1)*ratx;
- blylz = Bx(ix ,iy ,iz )*ratx1+Bx(ix+1,iy ,iz )*ratx;
- bhz = blyhz *raty1+bhyhz *raty;
- blz = blylz *raty1+bhylz *raty;
- b[0] = blz *ratz1+bhz *ratz;
- //
- bhyhz = By(ix ,iy+1,iz+1)*ratx1+By(ix+1,iy+1,iz+1)*ratx;
- bhylz = By(ix ,iy+1,iz )*ratx1+By(ix+1,iy+1,iz )*ratx;
- blyhz = By(ix ,iy ,iz+1)*ratx1+By(ix+1,iy ,iz+1)*ratx;
- blylz = By(ix ,iy ,iz )*ratx1+By(ix+1,iy ,iz )*ratx;
- bhz = blyhz *raty1+bhyhz *raty;
- blz = blylz *raty1+bhylz *raty;
- b[1] = blz *ratz1+bhz *ratz;
- //
- bhyhz = Bz(ix ,iy+1,iz+1)*ratx1+Bz(ix+1,iy+1,iz+1)*ratx;
- bhylz = Bz(ix ,iy+1,iz )*ratx1+Bz(ix+1,iy+1,iz )*ratx;
- blyhz = Bz(ix ,iy ,iz+1)*ratx1+Bz(ix+1,iy ,iz+1)*ratx;
- blylz = Bz(ix ,iy ,iz )*ratx1+Bz(ix+1,iy ,iz )*ratx;
- bhz = blyhz *raty1+bhyhz *raty;
- blz = blylz *raty1+bhylz *raty;
- b[2] = blz *ratz1+bhz *ratz;
- //printf("ratx,raty,ratz,b[0],b[1],b[2] %f %f %f %f %f %f\n",
- //ratx,raty,ratz,b[0],b[1],b[2]);
- //
- // ... use the dipole symmetry
- if (x[0]*x[1] < 0) b[1]=-b[1];
- if (x[0]<0) b[2]=-b[2];
- } else {
- printf("Invalid field map for constant mesh %d\n",fMap);
- }
- } else {
-//This is the ZDC part
- Float_t rad2=x[0]*x[0]+x[1]*x[1];
- if(rad2<D2RA2) {
- if(x[2]>D2BEG) {
-
-// Separator Dipole D2
- if(x[2]<D2END) b[1]=FDIP;
- } else if(x[2]>D1BEG) {
-
-// Separator Dipole D1
- if(x[2]<D1END) b[1]=-FDIP;
- }
- if(rad2<CORRA2) {
-
-// First quadrupole of inner triplet de-focussing in x-direction
-// Inner triplet
- if(x[2]>Z4BEG) {
- if(x[2]<Z4END) {
-
-// 2430 <-> 3060
- b[0]=-G1*x[1];
- b[1]=-G1*x[0];
- }
- } else if(x[2]>Z3BEG) {
- if(x[2]<Z3END) {
-
-// 1530 <-> 2080
- b[0]=G1*x[1];
- b[1]=G1*x[0];
- }
- } else if(x[2]>Z2BEG) {
- if(x[2]<Z2END) {
-
-// 890 <-> 1430
- b[0]=G1*x[1];
- b[1]=G1*x[0];
- }
- } else if(x[2]>Z1BEG) {
- if(x[2]<Z1END) {
-
-// 0 <-> 630
- b[0]=-G1*x[1];
- b[1]=-G1*x[0];
- }
- } else if(x[2]>CORBEG) {
- if(x[2]<COREND) {
-// Corrector dipole (because of dimuon arm)
- b[0]=FCORN;
- }
- }
- }
- }
- }
- }
-}
-
-//________________________________________
-void AliMagFCM::ReadField()
-{
- FILE *magfile;
- Int_t ix, iy, iz, ipx, ipy, ipz;
- Float_t bx, by, bz;
- char *fname;
- printf("Reading Magnetic Field %s from file %s\n",fName.Data(),fTitle.Data());
- fname = gSystem->ExpandPathName(fTitle.Data());
- magfile=fopen(fname,"r");
- delete [] fname;
- if (magfile) {
- fscanf(magfile,"%d %d %d %f %f %f %f %f %f",
- &fXn, &fYn, &fZn, &fXdel, &fYdel, &fZdel, &fXbeg, &fYbeg, &fZbeg);
- printf("fXn %d, fYn %d, fZn %d, fXdel %f, fYdel %f, fZdel %f, fXbeg %f, fYbeg %f, fZbeg %f\n",
- fXn, fYn, fZn, fXdel, fYdel, fZdel, fXbeg, fYbeg, fZbeg);
- fXdeli=1./fXdel;
- fYdeli=1./fYdel;
- fZdeli=1./fZdel;
- fB = new TVector(3*fXn*fYn*fZn);
- for (iz=0; iz<fZn; iz++) {
- ipz=iz*3*(fXn*fYn);
- for (iy=0; iy<fYn; iy++) {
- ipy=ipz+iy*3*fXn;
- for (ix=0; ix<fXn; ix++) {
- ipx=ipy+ix*3;
- fscanf(magfile,"%f %f %f",&bz,&by,&bx);
- (*fB)(ipx+2)=bz;
- (*fB)(ipx+1)=by;
- (*fB)(ipx )=bx;
- }
- }
- }
- } else {
- printf("File %s not found !\n",fTitle.Data());
- exit(1);
- }
}
-
-
-
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff