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aee8290b | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
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 | **************************************************************************/ | |
15 | ||
acd84897 | 16 | /* $Id$ */ |
e2afb3b6 | 17 | |
5d8718b8 | 18 | //----------------------------------------------------------------------- |
19 | // Class for Alice magnetic field with constant mesh | |
20 | // Used in the configuration macros (macros/Config.C, etc.) | |
21 | // Author: | |
22 | //----------------------------------------------------------------------- | |
0742d588 | 23 | |
fb17acd4 | 24 | #include "TSystem.h" |
88cb7938 | 25 | |
65fb704d | 26 | #include "TVector.h" |
aee8290b | 27 | |
28 | #include "AliMagFCM.h" | |
aee8290b | 29 | |
30 | ClassImp(AliMagFCM) | |
31 | ||
e2afb3b6 | 32 | //_______________________________________________________________________ |
33 | AliMagFCM::AliMagFCM(): | |
34 | fXbeg(0), | |
35 | fYbeg(0), | |
36 | fZbeg(0), | |
37 | fXdel(0), | |
38 | fYdel(0), | |
39 | fZdel(0), | |
40 | fSolenoid(0), | |
41 | fXdeli(0), | |
42 | fYdeli(0), | |
43 | fZdeli(0), | |
44 | fXn(0), | |
45 | fYn(0), | |
46 | fZn(0), | |
47 | fB(0) | |
48 | { | |
49 | // | |
50 | // Standard constructor | |
51 | // | |
52 | fType = kConMesh; | |
53 | fMap = 2; | |
54 | SetSolenoidField(); | |
55 | } | |
56 | ||
57 | //_______________________________________________________________________ | |
d0f1ee3b | 58 | AliMagFCM::AliMagFCM(const char *name, const char *title, Int_t integ, |
59 | Float_t factor, Float_t fmax): | |
57754f18 | 60 | AliMagFC(name,title,integ,factor,fmax), |
e2afb3b6 | 61 | fXbeg(0), |
62 | fYbeg(0), | |
63 | fZbeg(0), | |
64 | fXdel(0), | |
65 | fYdel(0), | |
66 | fZdel(0), | |
67 | fSolenoid(0), | |
68 | fXdeli(0), | |
69 | fYdeli(0), | |
70 | fZdeli(0), | |
71 | fXn(0), | |
72 | fYn(0), | |
73 | fZn(0), | |
74 | fB(0) | |
aee8290b | 75 | { |
76 | // | |
77 | // Standard constructor | |
78 | // | |
79 | fType = kConMesh; | |
d8408e76 | 80 | fMap = 2; |
4cc8933f | 81 | SetSolenoidField(); |
82 | ||
e2afb3b6 | 83 | if(fDebug>-1) Info("ctor", |
84 | "%s: Constant Mesh Field %s created: map= %d, factor= %f, file= %s\n", | |
9e1a0ddb | 85 | ClassName(),fName.Data(), fMap, factor,fTitle.Data()); |
aee8290b | 86 | } |
87 | ||
e2afb3b6 | 88 | //_______________________________________________________________________ |
89 | AliMagFCM::AliMagFCM(const AliMagFCM &magf): | |
57754f18 | 90 | AliMagFC(magf), |
e2afb3b6 | 91 | fXbeg(0), |
92 | fYbeg(0), | |
93 | fZbeg(0), | |
94 | fXdel(0), | |
95 | fYdel(0), | |
96 | fZdel(0), | |
97 | fSolenoid(0), | |
98 | fXdeli(0), | |
99 | fYdeli(0), | |
100 | fZdeli(0), | |
101 | fXn(0), | |
102 | fYn(0), | |
103 | fZn(0), | |
104 | fB(0) | |
aee8290b | 105 | { |
106 | // | |
107 | // Copy constructor | |
108 | // | |
109 | magf.Copy(*this); | |
110 | } | |
111 | ||
e2afb3b6 | 112 | //_______________________________________________________________________ |
6f3038e9 | 113 | void AliMagFCM::Field(Float_t *x, Float_t *b) const |
aee8290b | 114 | { |
115 | // | |
116 | // Method to calculate the magnetic field | |
117 | // | |
118 | Double_t ratx, raty, ratz, hix, hiy, hiz, ratx1, raty1, ratz1, | |
119 | bhyhz, bhylz, blyhz, blylz, bhz, blz, xl[3]; | |
120 | const Double_t kone=1; | |
121 | Int_t ix, iy, iz; | |
122 | ||
123 | // --- find the position in the grid --- | |
124 | ||
125 | b[0]=b[1]=b[2]=0; | |
57754f18 | 126 | |
127 | ||
128 | if(-700 < -x[2] && -x[2] < fZbeg && x[0] * x[0] +(x[1]+30)*(x[1]+30) < 560*560) { | |
129 | b[2]= fSolenoid; | |
aee8290b | 130 | } else { |
57754f18 | 131 | // The field map used here was calculated in a coordinate system where the muon arm is at z > 0 |
132 | // Transfom x -> -x and z -> -z | |
133 | Float_t xm = - x[0]; | |
134 | Float_t ym = x[1]; | |
135 | Float_t zm = - x[2]; | |
136 | ||
137 | Bool_t infield=(fZbeg <= zm && zm < fZbeg+fZdel*(fZn-1) | |
138 | && ( fXbeg <= TMath::Abs(xm) && TMath::Abs(xm) < fXbeg+fXdel*(fXn-1) ) | |
139 | && ( fYbeg <= TMath::Abs(ym) && TMath::Abs(ym) < fYbeg+fYdel*(fYn-1) )); | |
aee8290b | 140 | if(infield) { |
57754f18 | 141 | xl[0]=TMath::Abs(xm)-fXbeg; |
142 | xl[1]=TMath::Abs(ym)-fYbeg; | |
143 | xl[2]=zm-fZbeg; | |
aee8290b | 144 | |
145 | // --- start with x | |
146 | ||
147 | hix=xl[0]*fXdeli; | |
148 | ratx=hix-int(hix); | |
149 | ix=int(hix); | |
150 | ||
151 | hiy=xl[1]*fYdeli; | |
152 | raty=hiy-int(hiy); | |
153 | iy=int(hiy); | |
154 | ||
155 | hiz=xl[2]*fZdeli; | |
156 | ratz=hiz-int(hiz); | |
157 | iz=int(hiz); | |
158 | ||
159 | if(fMap==2) { | |
160 | // ... simple interpolation | |
161 | ratx1=kone-ratx; | |
162 | raty1=kone-raty; | |
163 | ratz1=kone-ratz; | |
164 | bhyhz = Bx(ix ,iy+1,iz+1)*ratx1+Bx(ix+1,iy+1,iz+1)*ratx; | |
165 | bhylz = Bx(ix ,iy+1,iz )*ratx1+Bx(ix+1,iy+1,iz )*ratx; | |
166 | blyhz = Bx(ix ,iy ,iz+1)*ratx1+Bx(ix+1,iy ,iz+1)*ratx; | |
167 | blylz = Bx(ix ,iy ,iz )*ratx1+Bx(ix+1,iy ,iz )*ratx; | |
168 | bhz = blyhz *raty1+bhyhz *raty; | |
169 | blz = blylz *raty1+bhylz *raty; | |
170 | b[0] = blz *ratz1+bhz *ratz; | |
171 | // | |
172 | bhyhz = By(ix ,iy+1,iz+1)*ratx1+By(ix+1,iy+1,iz+1)*ratx; | |
173 | bhylz = By(ix ,iy+1,iz )*ratx1+By(ix+1,iy+1,iz )*ratx; | |
174 | blyhz = By(ix ,iy ,iz+1)*ratx1+By(ix+1,iy ,iz+1)*ratx; | |
175 | blylz = By(ix ,iy ,iz )*ratx1+By(ix+1,iy ,iz )*ratx; | |
176 | bhz = blyhz *raty1+bhyhz *raty; | |
177 | blz = blylz *raty1+bhylz *raty; | |
178 | b[1] = blz *ratz1+bhz *ratz; | |
179 | // | |
180 | bhyhz = Bz(ix ,iy+1,iz+1)*ratx1+Bz(ix+1,iy+1,iz+1)*ratx; | |
181 | bhylz = Bz(ix ,iy+1,iz )*ratx1+Bz(ix+1,iy+1,iz )*ratx; | |
182 | blyhz = Bz(ix ,iy ,iz+1)*ratx1+Bz(ix+1,iy ,iz+1)*ratx; | |
183 | blylz = Bz(ix ,iy ,iz )*ratx1+Bz(ix+1,iy ,iz )*ratx; | |
184 | bhz = blyhz *raty1+bhyhz *raty; | |
185 | blz = blylz *raty1+bhylz *raty; | |
186 | b[2] = blz *ratz1+bhz *ratz; | |
187 | //printf("ratx,raty,ratz,b[0],b[1],b[2] %f %f %f %f %f %f\n", | |
188 | //ratx,raty,ratz,b[0],b[1],b[2]); | |
189 | // | |
190 | // ... use the dipole symmetry | |
57754f18 | 191 | if (xm*ym < 0) b[1]=-b[1]; |
192 | if (xm<0) b[2]=-b[2]; | |
193 | b[0] = -b[0]; | |
194 | b[2] = -b[2]; | |
195 | ||
aee8290b | 196 | } else { |
197 | printf("Invalid field map for constant mesh %d\n",fMap); | |
198 | } | |
199 | } else { | |
d95ea23f | 200 | //This is the ZDC part |
57754f18 | 201 | ZDCField(x,b); |
aee8290b | 202 | } |
d95ea23f | 203 | |
57754f18 | 204 | if(fFactor!=1) { |
205 | b[0]*=fFactor; | |
206 | b[1]*=fFactor; | |
207 | b[2]*=fFactor; | |
d95ea23f | 208 | } |
aee8290b | 209 | } |
aee8290b | 210 | } |
211 | ||
e2afb3b6 | 212 | //_______________________________________________________________________ |
aee8290b | 213 | void AliMagFCM::ReadField() |
214 | { | |
215 | // | |
216 | // Method to read the magnetic field map from file | |
217 | // | |
218 | FILE *magfile; | |
219 | Int_t ix, iy, iz, ipx, ipy, ipz; | |
220 | Float_t bx, by, bz; | |
221 | char *fname; | |
9e1a0ddb | 222 | if(fDebug) printf("%s: Reading Magnetic Field %s from file %s\n",ClassName(),fName.Data(),fTitle.Data()); |
aee8290b | 223 | fname = gSystem->ExpandPathName(fTitle.Data()); |
224 | magfile=fopen(fname,"r"); | |
225 | delete [] fname; | |
226 | if (magfile) { | |
227 | fscanf(magfile,"%d %d %d %f %f %f %f %f %f", | |
228 | &fXn, &fYn, &fZn, &fXdel, &fYdel, &fZdel, &fXbeg, &fYbeg, &fZbeg); | |
9e1a0ddb | 229 | if(fDebug>1) printf("%s: fXn %d, fYn %d, fZn %d, fXdel %f, fYdel %f, fZdel %f, fXbeg %f, fYbeg %f, fZbeg %f\n", |
230 | ClassName(),fXn, fYn, fZn, fXdel, fYdel, fZdel, fXbeg, fYbeg, fZbeg); | |
aee8290b | 231 | fXdeli=1./fXdel; |
232 | fYdeli=1./fYdel; | |
233 | fZdeli=1./fZdel; | |
234 | fB = new TVector(3*fXn*fYn*fZn); | |
235 | for (iz=0; iz<fZn; iz++) { | |
236 | ipz=iz*3*(fXn*fYn); | |
237 | for (iy=0; iy<fYn; iy++) { | |
238 | ipy=ipz+iy*3*fXn; | |
239 | for (ix=0; ix<fXn; ix++) { | |
240 | ipx=ipy+ix*3; | |
241 | fscanf(magfile,"%f %f %f",&bz,&by,&bx); | |
242 | (*fB)(ipx+2)=bz; | |
243 | (*fB)(ipx+1)=by; | |
244 | (*fB)(ipx )=bx; | |
245 | } | |
246 | } | |
247 | } | |
248 | } else { | |
9e1a0ddb | 249 | printf("%s: File %s not found !\n",ClassName(),fTitle.Data()); |
aee8290b | 250 | exit(1); |
251 | } | |
252 | } | |
253 | ||
e2afb3b6 | 254 | //_______________________________________________________________________ |
6c4904c2 | 255 | void AliMagFCM::Copy(TObject & /* magf */) const |
aee8290b | 256 | { |
257 | // | |
8918e700 | 258 | // Copy *this onto magf -- Not implemented |
aee8290b | 259 | // |
260 | Fatal("Copy","Not implemented!\n"); | |
261 | } | |
262 |