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65a39007 | 1 | //////////////////////////////////////////////////////////////////////////// |
2 | // // | |
3 | // AliFast Detector Class // | |
4 | // // | |
5 | // to provide information of effective material (X/Xo) of the detector // | |
6 | // needed for the multiple scattering formula used in AliFTrackMaker. // | |
7 | // // | |
8 | // the number and dimensions of cylindrical layers of material are // | |
9 | // initialised here for the TP status and are to be updated accordingly. // | |
10 | // // | |
11 | // // | |
12 | // origin: "init_geometry" routine in "res.f" fortran by Karel Safarik // | |
13 | // which was used to calculate the track resolution for TP. // | |
14 | // // | |
15 | // // | |
16 | // AliFast: E. Richter-Was and Y. Foka // | |
17 | // following general structure of Makers in ATLFast // | |
18 | // by R. Brun and E. R. Was // | |
19 | // // | |
20 | //////////////////////////////////////////////////////////////////////////// | |
21 | ||
22 | #include "AliFDet.h" | |
23 | #include "TMath.h" | |
24 | ||
25 | ClassImp(AliFDet) | |
26 | ||
27 | ||
28 | //_____________________________________________________________________________ | |
29 | AliFDet::AliFDet(const char *name, const char *title) : TNamed(name,title) | |
30 | { | |
31 | for(Int_t idDet=0; idDet<kNMaxDet; idDet++){ | |
32 | fRDet[idDet] = 0; | |
33 | fRDetSQ[idDet] = 0; | |
34 | fThickDet[idDet] = 0; | |
35 | fErrorRPhi[idDet] = 0; | |
36 | fErrorZ[idDet] = 0; | |
37 | fErrorR[idDet] = 0; | |
38 | fIFlagDet[idDet] = 0; | |
39 | fIFlagGas[idDet] = 0; | |
40 | } | |
41 | fBMag = 0; | |
42 | fConstMag = 0; | |
43 | fNDetActive = 0; | |
44 | fNDet = 0; | |
45 | } | |
46 | ||
47 | //_____________________________________________________________________________ | |
48 | void AliFDet::InitDetParam() | |
49 | { | |
50 | //initialisation of the detector material to the TP status. | |
51 | //needed for multiple scattering formula used in AliFTrackMaker | |
52 | //for track resolution calculation | |
53 | // | |
54 | //errorRPhi, errorZ: | |
55 | //the errors in bending and r direction are due to detector precision and alignement | |
56 | //the error in radial direction r is due to alignement only | |
57 | //the errors are momentum dependent; for iFlagDet=2 as for TPC are calculated properly | |
58 | // | |
59 | //fErrorVertexX,fErrorVertexY, fErrorVertexZ | |
60 | //errors of vertex | |
61 | //the vertex precision depends on particle multiplicity mult_density | |
62 | //optimistic errors for/high multiplicity | |
63 | ||
64 | Double_t rDet[kNMaxDet]; // radius of detector material in cm | |
65 | Double_t thickDet[kNMaxDet]; // thickness divided by X | |
66 | Double_t errorRPhi[kNMaxDet]; // error in bending direction | |
67 | Double_t errorZ[kNMaxDet]; // error in z direction | |
68 | Double_t errorR[kNMaxDet]; // error in r direction,from alignement only | |
69 | Int_t iFlagDet[kNMaxDet]; // 1: sensitive detector | |
70 | // 2: errors will be calculated | |
71 | Int_t iFlagGas[kNMaxDet]; // for gas detectors | |
72 | ||
73 | Int_t nDet; | |
74 | ||
75 | //dummy | |
76 | nDet = 0; | |
77 | rDet[nDet] = 0; | |
78 | thickDet[nDet] = 0; | |
79 | iFlagDet[nDet] = 0; | |
80 | iFlagGas[nDet] = 0; | |
81 | //vacum pipe | |
82 | nDet = 1; | |
83 | rDet[nDet] = 3.0; | |
84 | thickDet[nDet] = 0.06/35.3; // berylium | |
85 | iFlagDet[nDet] = 0; // no detection | |
86 | iFlagGas[nDet] = 0; | |
87 | // | |
88 | nDet = 2; | |
89 | rDet[nDet] = 3.5; | |
90 | thickDet[nDet] = 1.0000/30420.0; // air | |
91 | iFlagDet[nDet] = 0; // no detection | |
92 | iFlagGas[nDet] = 1; | |
93 | // | |
94 | nDet = 3; | |
95 | rDet[nDet] = 4.0; | |
96 | thickDet[nDet] = 0.06/9.36; // silicon | |
97 | errorRPhi[nDet] = 0.0015 + 0.0005; | |
98 | errorZ[nDet] = 0.009 + 0.0005; | |
99 | errorR[nDet] = 0.001; | |
100 | iFlagDet[nDet] = 1; | |
101 | iFlagGas[nDet] = 0; | |
102 | // | |
103 | nDet = 4; | |
104 | rDet[nDet] = 5.75; | |
105 | thickDet[nDet] = 3.5/30420.0; // silicon | |
106 | iFlagDet[nDet] = 0; | |
107 | iFlagGas[nDet] = 1; | |
108 | // | |
109 | nDet = 5; | |
110 | rDet[nDet] = 7.5; | |
111 | thickDet[nDet] = 0.06/9.36; // silicon | |
112 | errorRPhi[nDet] = 0.0015 + 0.0005; | |
113 | errorZ[nDet] = 0.009 + 0.0005; | |
114 | errorR[nDet] = 0.001; | |
115 | iFlagDet[nDet] = 1; | |
116 | iFlagGas[nDet] = 0; | |
117 | // | |
118 | nDet = 6; | |
119 | rDet[nDet] = 10.75; | |
120 | thickDet[nDet] = 6.5/30420.0; // air | |
121 | iFlagDet[nDet] = 0; | |
122 | iFlagGas[nDet] = 1; | |
123 | // first silicon drift | |
124 | nDet = 7; | |
125 | rDet[nDet] = 14.0; | |
126 | thickDet[nDet] = 0.06/9.36; // silicon | |
127 | errorRPhi[nDet] = 0.0025 + 0.0005; | |
128 | errorZ[nDet] = 0.0025 + 0.0005; | |
129 | errorR[nDet] = 0.001; | |
130 | iFlagDet[nDet] = 1; | |
131 | iFlagGas[nDet] = 0; | |
132 | // | |
133 | nDet = 8; | |
134 | rDet[nDet] = 19.0; | |
135 | thickDet[nDet] = 10.0/30420.0; // air | |
136 | iFlagDet[nDet] = 0; | |
137 | iFlagGas[nDet] = 1; | |
138 | // second silicon drift | |
139 | nDet = 9; | |
140 | rDet[nDet] = 24.0; | |
141 | thickDet[nDet] = 0.06/9.36; // silicon | |
142 | errorRPhi[nDet] = 0.0025 + 0.0005; | |
143 | errorZ[nDet] = 0.0025 + 0.0005; | |
144 | errorR[nDet] = 0.001; | |
145 | iFlagDet[nDet] = 1; | |
146 | iFlagGas[nDet] = 0; | |
147 | // | |
148 | nDet = 10; | |
149 | rDet[nDet] = 32.0; | |
150 | thickDet[nDet] = 16.0/30420.0; // air | |
151 | iFlagDet[nDet] = 0; | |
152 | iFlagGas[nDet] = 1; | |
153 | // first silicon strips | |
154 | nDet = 11; | |
155 | rDet[nDet] = 40.0; | |
156 | thickDet[nDet] = 0.06/9.36; // silicon | |
157 | errorRPhi[nDet] = 0.003 + 0.0005; | |
158 | errorZ[nDet] = 0.100 + 0.0005; | |
159 | errorR[nDet] = 0.001; | |
160 | iFlagDet[nDet] = 1; | |
161 | iFlagGas[nDet] = 0; | |
162 | // | |
163 | nDet = 12; | |
164 | rDet[nDet] = 42.5; | |
165 | thickDet[nDet] = 5.0/30420.0; // air | |
166 | iFlagDet[nDet] = 0; | |
167 | iFlagGas[nDet] = 1; | |
168 | // second silicon strips | |
169 | nDet = 13; | |
170 | rDet[nDet] = 45.0; | |
171 | thickDet[nDet] = 0.06/9.36; // silicon | |
172 | errorRPhi[nDet] = 0.003 + 0.0005; | |
173 | errorZ[nDet] = 0.100 + 0.0005; | |
174 | errorR[nDet] = 0.001; | |
175 | iFlagDet[nDet] = 1; | |
176 | iFlagGas[nDet] = 0; | |
177 | // | |
178 | nDet = 14; | |
179 | rDet[nDet] = 47.5; | |
180 | thickDet[nDet] = 5.0/30420.0; // air | |
181 | iFlagDet[nDet] = 0; | |
182 | iFlagGas[nDet] = 1; | |
183 | // | |
184 | nDet = 15; | |
185 | rDet[nDet] = 50.0; | |
186 | thickDet[nDet] = 0.01; // 1% of something ITS | |
187 | iFlagDet[nDet] = 0; | |
188 | iFlagGas[nDet] = 0; | |
189 | // | |
190 | nDet = 16; | |
191 | rDet[nDet] = 51.0; | |
192 | thickDet[nDet] = 2.0/30420.0; // air | |
193 | iFlagDet[nDet] = 0; | |
194 | iFlagGas[nDet] = 1; | |
195 | // TPC HV degrager | |
196 | nDet = 17; | |
197 | rDet[nDet] = 52.0; | |
198 | thickDet[nDet] = 0.0018; // 0.18 % of something TPC | |
199 | iFlagDet[nDet] = 0; | |
200 | iFlagGas[nDet] = 0; | |
201 | // | |
202 | nDet = 18; | |
203 | rDet[nDet] = 68.75; | |
204 | thickDet[nDet] = 12.5/18310.0; // CO2 | |
205 | iFlagDet[nDet] = 0; | |
206 | iFlagGas[nDet] = 1; | |
207 | // | |
208 | nDet = 19; | |
209 | rDet[nDet] = 71.25; | |
210 | thickDet[nDet] = 12.5/18310.0; // CO2 | |
211 | iFlagDet[nDet] = 0; | |
212 | iFlagGas[nDet] = 1; | |
213 | // TPC inner field cage | |
214 | nDet = 20; | |
215 | rDet[nDet] = 78.0; | |
216 | thickDet[nDet] = 0.0041; // 0.41 % of something | |
217 | iFlagDet[nDet] = 0; | |
218 | iFlagGas[nDet] = 0; | |
219 | // | |
220 | nDet = 21; | |
221 | rDet[nDet] = 83.5; | |
222 | thickDet[nDet] = 11.0/32155.6; // neon | |
223 | iFlagDet[nDet] = 0; | |
224 | iFlagGas[nDet] = 1; | |
225 | // | |
226 | nDet = 22; | |
227 | rDet[nDet] = 94.5; | |
228 | thickDet[nDet] = 11.0/32155.6; // neon | |
229 | iFlagDet[nDet] = 0; | |
230 | iFlagGas[nDet] = 1; | |
231 | // TPC | |
232 | Int_t nPadRow = 75; | |
233 | Double_t rCurrent = 99.0; | |
234 | Double_t deltaR = 2.0; | |
235 | for(Int_t ipad=1; ipad<nPadRow+1; ipad++){ | |
236 | nDet=nDet+1; | |
237 | rCurrent = rCurrent + deltaR; | |
238 | rDet[nDet] = rCurrent; | |
239 | thickDet[nDet] = 2.0/32155.6; // neon | |
240 | errorRPhi[nDet] = 0.0; //errors are momentum dependent | |
241 | errorZ[nDet] = 0.0; //to be calculated latter | |
242 | errorR[nDet] = 0.0075; | |
243 | iFlagDet[nDet] = 2; //means error defined latter | |
244 | iFlagGas[nDet] = 1; | |
245 | } | |
246 | ||
247 | // vertex precision | |
248 | Double_t multDensity = 3906.25; | |
249 | ||
250 | fErrorVertexX = 0.010/TMath::Sqrt(multDensity) + 0.00060; | |
251 | fErrorVertexY = fErrorVertexX; | |
252 | fErrorVertexZ = 0.025/TMath::Sqrt(multDensity) + 0.00075; | |
253 | ||
254 | ||
255 | // magnetic field | |
256 | fBMag = 2.0; | |
257 | fConstMag = 1.0/(fBMag*0.297792458e-3); | |
258 | ||
259 | ||
260 | // prepare more suitables variables | |
261 | ||
262 | Int_t nDetActive = 0; | |
263 | ||
264 | for(Int_t idDet=0; idDet<nDet+1; idDet++){ | |
265 | fRDet[idDet] = rDet[idDet]; | |
266 | fRDetSQ[idDet] = rDet[idDet]*rDet[idDet]; | |
267 | fThickDet[idDet] = 0.0136* TMath::Sqrt(thickDet[idDet]); | |
268 | fIFlagDet[idDet] = iFlagDet[idDet]; | |
269 | fIFlagGas[idDet] = iFlagGas[idDet]; | |
270 | if(iFlagDet[idDet] > 0){ | |
271 | nDetActive = nDetActive+1; | |
272 | fErrorR[idDet] = errorR[idDet]*errorR[idDet]; | |
273 | if(iFlagDet[idDet] == 1){ | |
274 | fErrorRPhi[idDet] = errorRPhi[idDet]*errorRPhi[idDet]; | |
275 | fErrorZ[idDet] = errorZ[idDet]*errorZ[idDet]; | |
276 | } | |
277 | } | |
278 | } | |
279 | ||
280 | fErrorVertexX = fErrorVertexX*fErrorVertexX; | |
281 | fErrorVertexY = fErrorVertexY*fErrorVertexY; | |
282 | fErrorVertexZ = fErrorVertexZ*fErrorVertexZ; | |
283 | ||
284 | fNDetActive = nDetActive; | |
285 | fNDet = nDet; | |
286 | ||
287 | ||
288 | } | |
289 | ||
290 | //_____________________________________________________________________________ | |
291 | void AliFDet::PrintDetInfo() | |
292 | { | |
293 | //to print information for the initialisation of the detector | |
294 | printf("**************************************************************\n"); | |
295 | printf("* *\n"); | |
296 | printf("* ALICE detector *\n"); | |
297 | printf("* *\n"); | |
298 | printf("**************************************************************\n"); | |
299 | ||
300 | for(Int_t idDet=0; idDet<fNDet+1; idDet++){ | |
301 | if(fIFlagDet[idDet] == 0){ | |
302 | printf("%5s %3d %8.1f %2s %10.5f %20s\n", | |
303 | "det=",idDet,fRDet[idDet],"cm", | |
304 | TMath::Power(fThickDet[idDet]/0.0136,2), | |
305 | "of X0 <---- pasive material"); | |
306 | } else{ | |
307 | printf("%5s %3d %8.1f %2s %10.5f %6s %6.4f %6.4f \n", | |
308 | "det=",idDet,fRDet[idDet],"cm", | |
309 | TMath::Power(fThickDet[idDet]/0.0136,2),"of X0, errors", | |
310 | TMath::Sqrt(fErrorRPhi[idDet]),TMath::Sqrt(fErrorZ[idDet])); | |
311 | } | |
312 | } | |
313 | printf("%20s %10.4f %10.4f %10.4f\n","vertex precision(x,y,z)", | |
314 | TMath::Sqrt(fErrorVertexX), | |
315 | TMath::Sqrt(fErrorVertexY), | |
316 | TMath::Sqrt(fErrorVertexZ)); | |
317 | printf("%20s %10.4f %10s %8.1f %5s\n","magnetic field (kGauss)",fBMag, | |
318 | "(constant",fConstMag,")"); | |
319 | ||
320 | } |