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 //-------------------------------------------------------------------------
19 // Constant magnetic field class
20 // Used by AliRun class
22 //-------------------------------------------------------------------------
31 //________________________________________
32 AliMagFC::AliMagFC(const char *name, const char *title, Int_t integ,
33 Float_t factor, Float_t fmax)
34 : AliMagF(name,title,integ,factor,fmax),
38 // Standard constructor
44 //________________________________________
45 void AliMagFC::Field(Float_t *x, Float_t *b) const
48 // Method to return the field in a point
52 if(TMath::Abs(x[2])<700 && x[0]*x[0]+(x[1]+30)*(x[1]+30) < 560*560) {
55 if ( -725 >= x[2] && x[2] >= -1225 ) {
56 Float_t dz = TMath::Abs(-975-x[2])*0.01;
57 b[0] = - (1-0.1*dz*dz)*7;
69 AliFatal(Form("Invalid field map for constant field %d",fMap));
74 void AliMagFC::ZDCField(Float_t *x, Float_t *b) const
76 //This is the ZDC part
77 Float_t rad2 = x[0] * x[0] + x[1] * x[1];
79 if (fCompensator && (x[2] > 919. && x[2] < 1231.) && rad2 < 16.) {
80 // Compensator magnet at z = 1075 m
88 if(x[2] < kCORBEG2 && x[2] > kCOREND2){
93 else if(x[2] < kZ1BEG && x[2] > kZ1END){
99 else if(x[2] < kZ2BEG && x[2] > kZ2END){
105 else if(x[2] < kZ3BEG && x[2] > kZ3END){
111 else if(x[2] < kZ4BEG && x[2] > kZ4END){
117 else if(x[2] < kD1BEG && x[2] > kD1END){
122 else if(x[2] < kD2BEG && x[2] > kD2END){
123 if(((x[0]-kXCEN1D2)*(x[0]-kXCEN1D2)+(x[1]-kYCEN1D2)*(x[1]-kYCEN1D2))<kD2RA2
124 || ((x[0]-kXCEN2D2)*(x[0]-kXCEN2D2)+(x[1]-kYCEN2D2)*(x[1]-kYCEN2D2))<kD2RA2){