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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 | ||
16 | /* | |
17 | $Log$ | |
18 | Revision 1.3.6.1 2002/07/24 10:08:13 alibrary | |
19 | Updating VirtualMC | |
20 | ||
21 | Revision 1.4 2002/07/10 15:06:22 morsch | |
22 | Initialize TVector* save. | |
23 | ||
24 | Revision 1.3 2002/02/26 16:13:07 morsch | |
25 | Correction in streamer. | |
26 | ||
27 | Revision 1.2 2002/02/22 14:00:20 morsch | |
28 | Protection against replication of fieldmap data in gAlice. | |
29 | ||
30 | Revision 1.1 2002/02/14 11:41:28 morsch | |
31 | Magnetic field map for ALICE for L3+muon spectrometer stored in 3 seperate | |
32 | root files. | |
33 | ||
34 | */ | |
35 | ||
36 | // | |
37 | // Author: Andreas Morsch <andreas.morsch@cern.ch> | |
38 | // | |
39 | ||
40 | #include <TVector.h> | |
41 | #include "AliFieldMap.h" | |
42 | #include "TSystem.h" | |
43 | ||
44 | ClassImp(AliFieldMap) | |
45 | ||
46 | //________________________________________ | |
47 | AliFieldMap::AliFieldMap() | |
48 | { | |
49 | // | |
50 | // Standard constructor | |
51 | // | |
52 | fB = 0; | |
53 | SetWriteEnable(); | |
54 | } | |
55 | ||
56 | AliFieldMap::AliFieldMap(const char *name, const char *title) | |
57 | : TNamed(name,title) | |
58 | { | |
59 | // | |
60 | // Standard constructor | |
61 | // | |
62 | fB = 0; | |
63 | ReadField(); | |
64 | SetWriteEnable(); | |
65 | } | |
66 | ||
67 | AliFieldMap::~AliFieldMap() | |
68 | { | |
69 | // | |
70 | // Destructor | |
71 | // | |
72 | delete fB; | |
73 | } | |
74 | ||
75 | //________________________________________ | |
76 | AliFieldMap::AliFieldMap(const AliFieldMap &map) | |
77 | { | |
78 | // | |
79 | // Copy constructor | |
80 | // | |
81 | map.Copy(*this); | |
82 | } | |
83 | ||
84 | //________________________________________ | |
85 | void AliFieldMap::ReadField() | |
86 | { | |
87 | // | |
88 | // Method to read the magnetic field map from file | |
89 | // | |
90 | FILE* magfile; | |
91 | // FILE* endf = fopen("end.table", "r"); | |
92 | // FILE* out = fopen("out", "w"); | |
93 | ||
94 | Int_t ix, iy, iz, ipx, ipy, ipz; | |
95 | Float_t bx, by, bz; | |
96 | char *fname = 0; | |
97 | printf("%s: Reading Magnetic Field Map %s from file %s\n", | |
98 | ClassName(),fName.Data(),fTitle.Data()); | |
99 | ||
100 | fname = gSystem->ExpandPathName(fTitle.Data()); | |
101 | magfile = fopen(fname,"r"); | |
102 | delete [] fname; | |
103 | ||
104 | fscanf(magfile,"%d %d %d %f %f %f %f %f %f", | |
105 | &fXn, &fYn, &fZn, &fXbeg, &fYbeg, &fZbeg, &fXdel, &fYdel, &fZdel); | |
106 | ||
107 | fXdeli = 1./fXdel; | |
108 | fYdeli = 1./fYdel; | |
109 | fZdeli = 1./fZdel; | |
110 | fXend = fXbeg + (fXn-1)*fXdel; | |
111 | fYend = fYbeg + (fYn-1)*fYdel; | |
112 | fZend = fZbeg + (fZn-1)*fZdel; | |
113 | ||
114 | Int_t nDim = fXn*fYn*fZn; | |
115 | ||
116 | // Float_t x,y,z,b; | |
117 | ||
118 | fB = new TVector(3*nDim); | |
119 | if (magfile) { | |
120 | for (ix = 0; ix < fXn; ix++) { | |
121 | ipx=ix*3*(fZn*fYn); | |
122 | for (iy = 0; iy < fYn; iy++) { | |
123 | ipy=ipx+iy*3*fZn; | |
124 | for (iz = 0; iz < fZn; iz++) { | |
125 | ipz=ipy+iz*3; | |
126 | ||
127 | if (iz == -1) { | |
128 | // fscanf(endf,"%f %f %f", &bx,&by,&bz); | |
129 | } else if (iz > -1) { | |
130 | fscanf(magfile," %f %f %f", &bx, &by, &bz); | |
131 | } else { | |
132 | continue; | |
133 | } | |
134 | ||
135 | // fscanf(magfile,"%f %f %f %f %f %f %f ", | |
136 | // &x, &y, &z, &bx,&by,&bz, &b); | |
137 | // fprintf(out, "%15.8e %15.8e %15.8e \n", bx, by, bz); | |
138 | ||
139 | (*fB)(ipz+2) = 10.*bz; | |
140 | (*fB)(ipz+1) = 10.*by; | |
141 | (*fB)(ipz ) = 10.*bx; | |
142 | } //iz | |
143 | } // iy | |
144 | } // ix | |
145 | /* | |
146 | // | |
147 | // this part for interpolation between z = 700 and 720 cm to get | |
148 | // z = 710 cm | |
149 | // | |
150 | for (ix = 0; ix < fXn; ix++) { | |
151 | ipx=ix*3*(fZn*fYn); | |
152 | for (iy = 0; iy < fYn; iy++) { | |
153 | ipy=ipx+iy*3*fZn; | |
154 | Float_t bxx = (Bx(ix,iy,0) + Bx(ix,iy,2))/2.; | |
155 | Float_t byy = (By(ix,iy,0) + By(ix,iy,2))/2.; | |
156 | Float_t bzz = (Bz(ix,iy,0) + Bz(ix,iy,2))/2.; | |
157 | ipz=ipy+3; | |
158 | (*fB)(ipz+2) = bzz; | |
159 | (*fB)(ipz+1) = byy; | |
160 | (*fB)(ipz ) = bxx; | |
161 | } // iy | |
162 | } // ix | |
163 | */ | |
164 | } else { | |
165 | printf("%s: File %s not found !\n",ClassName(),fTitle.Data()); | |
166 | exit(1); | |
167 | } // if mafile | |
168 | } | |
169 | ||
170 | void AliFieldMap::Field(Float_t *x, Float_t *b) | |
171 | { | |
172 | // | |
173 | // Use simple interpolation to obtain field at point x | |
174 | // | |
175 | Double_t ratx, raty, ratz, hix, hiy, hiz, ratx1, raty1, ratz1, | |
176 | bhyhz, bhylz, blyhz, blylz, bhz, blz, xl[3]; | |
177 | const Double_t kone=1; | |
178 | Int_t ix, iy, iz; | |
179 | b[0]=b[1]=b[2]=0; | |
180 | // | |
181 | ||
182 | xl[0]=TMath::Abs(x[0])-fXbeg; | |
183 | xl[1]=TMath::Abs(x[1])-fYbeg; | |
184 | xl[2]=x[2]-fZbeg; | |
185 | ||
186 | hix=xl[0]*fXdeli; | |
187 | ratx=hix-int(hix); | |
188 | ix=int(hix); | |
189 | ||
190 | hiy=xl[1]*fYdeli; | |
191 | raty=hiy-int(hiy); | |
192 | iy=int(hiy); | |
193 | ||
194 | hiz=xl[2]*fZdeli; | |
195 | ratz=hiz-int(hiz); | |
196 | iz=int(hiz); | |
197 | ||
198 | ratx1=kone-ratx; | |
199 | raty1=kone-raty; | |
200 | ratz1=kone-ratz; | |
201 | ||
202 | bhyhz = Bx(ix ,iy+1,iz+1)*ratx1+Bx(ix+1,iy+1,iz+1)*ratx; | |
203 | bhylz = Bx(ix ,iy+1,iz )*ratx1+Bx(ix+1,iy+1,iz )*ratx; | |
204 | blyhz = Bx(ix ,iy ,iz+1)*ratx1+Bx(ix+1,iy ,iz+1)*ratx; | |
205 | blylz = Bx(ix ,iy ,iz )*ratx1+Bx(ix+1,iy ,iz )*ratx; | |
206 | bhz = blyhz *raty1+bhyhz *raty; | |
207 | blz = blylz *raty1+bhylz *raty; | |
208 | b[0] = blz *ratz1+bhz *ratz; | |
209 | // | |
210 | bhyhz = By(ix ,iy+1,iz+1)*ratx1+By(ix+1,iy+1,iz+1)*ratx; | |
211 | bhylz = By(ix ,iy+1,iz )*ratx1+By(ix+1,iy+1,iz )*ratx; | |
212 | blyhz = By(ix ,iy ,iz+1)*ratx1+By(ix+1,iy ,iz+1)*ratx; | |
213 | blylz = By(ix ,iy ,iz )*ratx1+By(ix+1,iy ,iz )*ratx; | |
214 | bhz = blyhz *raty1+bhyhz *raty; | |
215 | blz = blylz *raty1+bhylz *raty; | |
216 | b[1] = blz *ratz1+bhz *ratz; | |
217 | // | |
218 | bhyhz = Bz(ix ,iy+1,iz+1)*ratx1+Bz(ix+1,iy+1,iz+1)*ratx; | |
219 | bhylz = Bz(ix ,iy+1,iz )*ratx1+Bz(ix+1,iy+1,iz )*ratx; | |
220 | blyhz = Bz(ix ,iy ,iz+1)*ratx1+Bz(ix+1,iy ,iz+1)*ratx; | |
221 | blylz = Bz(ix ,iy ,iz )*ratx1+Bz(ix+1,iy ,iz )*ratx; | |
222 | bhz = blyhz *raty1+bhyhz *raty; | |
223 | blz = blylz *raty1+bhylz *raty; | |
224 | b[2] = blz *ratz1+bhz *ratz; | |
225 | } | |
226 | ||
227 | //________________________________________ | |
228 | void AliFieldMap::Copy(AliFieldMap & /* magf */) const | |
229 | { | |
230 | // | |
231 | // Copy *this onto magf -- Not implemented | |
232 | // | |
233 | Fatal("Copy","Not implemented!\n"); | |
234 | } | |
235 | ||
236 | //________________________________________ | |
237 | AliFieldMap & AliFieldMap::operator =(const AliFieldMap &magf) | |
238 | { | |
239 | magf.Copy(*this); | |
240 | return *this; | |
241 | } | |
242 | ||
243 | void AliFieldMap::Streamer(TBuffer &R__b) | |
244 | { | |
245 | // Stream an object of class AliFieldMap. | |
246 | TVector* save = 0; | |
247 | ||
248 | if (R__b.IsReading()) { | |
249 | AliFieldMap::Class()->ReadBuffer(R__b, this); | |
250 | } else { | |
251 | if (!fWriteEnable) { | |
252 | save = fB; | |
253 | fB = 0; | |
254 | } | |
255 | AliFieldMap::Class()->WriteBuffer(R__b, this); | |
256 | if (!fWriteEnable) fB = save; | |
257 | } | |
258 | } |