]>
Commit | Line | Data |
---|---|---|
46d29e70 | 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 | ||
88cb7938 | 16 | /* $Id$ */ |
b9d0a01d | 17 | |
88cb7938 | 18 | |
19 | /////////////////////////////////////////////////////////////////////////////// | |
20 | // // | |
21 | // TRD cluster // | |
22 | // // | |
23 | /////////////////////////////////////////////////////////////////////////////// | |
46d29e70 | 24 | |
5843e420 | 25 | #include "TMath.h" |
26 | ||
203967fc | 27 | #include "AliLog.h" |
46d29e70 | 28 | #include "AliTRDcluster.h" |
834ac2c9 | 29 | #include "AliTRDgeometry.h" |
30 | #include "AliTRDCommonParam.h" | |
46d29e70 | 31 | |
46d29e70 | 32 | ClassImp(AliTRDcluster) |
bdb68f8c | 33 | |
6d50f529 | 34 | //___________________________________________________________________________ |
35 | AliTRDcluster::AliTRDcluster() | |
36 | :AliCluster() | |
af26ce80 | 37 | ,fPadCol(0) |
38 | ,fPadRow(0) | |
39 | ,fPadTime(0) | |
f5375dcb | 40 | ,fLocalTimeBin(0) |
41 | ,fNPads(0) | |
42 | ,fClusterMasking(0) | |
43 | ,fDetector(0) | |
44 | ,fQ(0) | |
45 | ,fCenter(0) | |
6d50f529 | 46 | { |
bdb68f8c | 47 | // |
a6dd11e9 | 48 | // Default constructor |
bdb68f8c | 49 | // |
6d50f529 | 50 | |
51 | for (Int_t i = 0; i < 7; i++) { | |
52 | fSignals[i] = 0; | |
53 | } | |
54 | ||
bdb68f8c | 55 | } |
6d50f529 | 56 | |
34eaaa7e | 57 | //___________________________________________________________________________ |
58 | AliTRDcluster::AliTRDcluster(Int_t det, Float_t q | |
59 | , Float_t *pos, Float_t *sig | |
60 | , Int_t *tracks, Char_t npads, Short_t *signals | |
af26ce80 | 61 | , UChar_t col, UChar_t row, UChar_t time |
62 | , Char_t timebin, Float_t center, UShort_t volid) | |
63 | :AliCluster(volid,pos[0],pos[1],pos[2],sig[0],sig[1],0.0,0x0) | |
af26ce80 | 64 | ,fPadCol(col) |
65 | ,fPadRow(row) | |
66 | ,fPadTime(time) | |
f5375dcb | 67 | ,fLocalTimeBin(timebin) |
68 | ,fNPads(npads) | |
69 | ,fClusterMasking(0) | |
70 | ,fDetector(det) | |
71 | ,fQ(q) | |
72 | ,fCenter(center) | |
34eaaa7e | 73 | { |
74 | // | |
75 | // Constructor | |
76 | // | |
77 | ||
78 | for (Int_t i = 0; i < 7; i++) { | |
79 | fSignals[i] = signals[i]; | |
80 | } | |
81 | ||
82 | if (tracks) { | |
83 | AddTrackIndex(tracks); | |
84 | } | |
85 | ||
86 | } | |
87 | ||
bbf92647 | 88 | //_____________________________________________________________________________ |
6d50f529 | 89 | AliTRDcluster::AliTRDcluster(const AliTRDcluster &c) |
34eaaa7e | 90 | :AliCluster(c) |
af26ce80 | 91 | ,fPadCol(c.fPadCol) |
92 | ,fPadRow(c.fPadRow) | |
93 | ,fPadTime(c.fPadTime) | |
f5375dcb | 94 | ,fLocalTimeBin(c.fLocalTimeBin) |
95 | ,fNPads(c.fNPads) | |
96 | ,fClusterMasking(c.fClusterMasking) | |
97 | ,fDetector(c.fDetector) | |
98 | ,fQ(c.fQ) | |
99 | ,fCenter(c.fCenter) | |
bbf92647 | 100 | { |
101 | // | |
102 | // Copy constructor | |
103 | // | |
104 | ||
0ae89c5d | 105 | SetBit(kInChamber, c.IsInChamber()); |
75fb37cc | 106 | SetLabel(c.GetLabel(0),0); |
107 | SetLabel(c.GetLabel(1),1); | |
108 | SetLabel(c.GetLabel(2),2); | |
6d50f529 | 109 | |
75fb37cc | 110 | SetY(c.GetY()); |
111 | SetZ(c.GetZ()); | |
112 | SetSigmaY2(c.GetSigmaY2()); | |
113 | SetSigmaZ2(c.GetSigmaZ2()); | |
6d50f529 | 114 | |
115 | for (Int_t i = 0; i < 7; i++) { | |
116 | fSignals[i] = c.fSignals[i]; | |
117 | } | |
118 | ||
a2b90f83 | 119 | } |
120 | ||
a2b90f83 | 121 | //_____________________________________________________________________________ |
122 | void AliTRDcluster::AddTrackIndex(Int_t *track) | |
123 | { | |
124 | // | |
125 | // Adds track index. Currently assumed that track is an array of | |
126 | // size 9, and up to 3 track indexes are stored in fTracks[3]. | |
127 | // Indexes are sorted according to: | |
128 | // 1) index of max number of appearances is stored first | |
129 | // 2) if two or more indexes appear equal number of times, the lowest | |
130 | // ones are stored first; | |
131 | // | |
bbf92647 | 132 | |
88cb7938 | 133 | const Int_t kSize = 9; |
6d50f529 | 134 | Int_t entries[kSize][2]; |
a2b90f83 | 135 | |
6d50f529 | 136 | Int_t i = 0; |
137 | Int_t j = 0; | |
138 | Int_t k = 0; | |
139 | Int_t index; | |
88cb7938 | 140 | Bool_t indexAdded; |
a2b90f83 | 141 | |
6d50f529 | 142 | for (i = 0; i < kSize; i++) { |
143 | entries[i][0] = -1; | |
144 | entries[i][1] = 0; | |
5443e65e | 145 | } |
a2b90f83 | 146 | |
6d50f529 | 147 | for (k = 0; k < kSize; k++) { |
148 | ||
149 | index = track[k]; | |
150 | indexAdded = kFALSE; | |
151 | ||
152 | j = 0; | |
a2b90f83 | 153 | if (index >= 0) { |
6d50f529 | 154 | while ((!indexAdded) && (j < kSize)) { |
155 | if ((entries[j][0] == index) || | |
156 | (entries[j][1] == 0)) { | |
157 | entries[j][0] = index; | |
158 | entries[j][1] = entries[j][1] + 1; | |
159 | indexAdded = kTRUE; | |
a2b90f83 | 160 | } |
161 | j++; | |
162 | } | |
163 | } | |
6d50f529 | 164 | |
165 | } | |
166 | ||
167 | // Sort by number of appearances and index value | |
168 | Int_t swap = 1; | |
169 | Int_t tmp0; | |
170 | Int_t tmp1; | |
171 | while (swap > 0) { | |
172 | swap = 0; | |
173 | for (i = 0; i < (kSize - 1); i++) { | |
174 | if ((entries[i][0] >= 0) && | |
175 | (entries[i+1][0] >= 0)) { | |
a2b90f83 | 176 | if ((entries[i][1] < entries[i+1][1]) || |
177 | ((entries[i][1] == entries[i+1][1]) && | |
6d50f529 | 178 | (entries[i][0] > entries[i+1][0]))) { |
179 | tmp0 = entries[i][0]; | |
180 | tmp1 = entries[i][1]; | |
181 | entries[i][0] = entries[i+1][0]; | |
182 | entries[i][1] = entries[i+1][1]; | |
183 | entries[i+1][0] = tmp0; | |
184 | entries[i+1][1] = tmp1; | |
185 | swap++; | |
a2b90f83 | 186 | } |
187 | } | |
188 | } | |
5443e65e | 189 | } |
a2b90f83 | 190 | |
6d50f529 | 191 | // Set track indexes |
192 | for (i = 0; i < 3; i++) { | |
193 | SetLabel(entries[i][0],i); | |
194 | } | |
a2b90f83 | 195 | |
196 | return; | |
46d29e70 | 197 | |
5443e65e | 198 | } |
46d29e70 | 199 | |
203967fc | 200 | //_____________________________________________________________________________ |
201 | void AliTRDcluster::Clear(Option_t *) | |
202 | { | |
203 | // | |
204 | // Reset all member to the default value | |
205 | // | |
206 | fPadCol=0; | |
207 | fPadRow=0; | |
208 | fPadTime=0; | |
209 | fLocalTimeBin=0; | |
210 | fNPads=0; | |
211 | fClusterMasking=0; | |
212 | fDetector=0; | |
213 | for (Int_t i=0; i < 7; i++) fSignals[i]=0; | |
214 | fQ = 0; | |
215 | fCenter = 0; | |
216 | for (Int_t i = 0; i < 3; i++) SetLabel(0,i); | |
217 | SetX(0); | |
218 | SetY(0); | |
219 | SetZ(0); | |
220 | SetSigmaY2(0); | |
221 | SetSigmaZ2(0); | |
222 | SetVolumeId(0); | |
223 | } | |
224 | ||
6d50f529 | 225 | //_____________________________________________________________________________ |
bdb68f8c | 226 | Float_t AliTRDcluster::GetSumS() const |
227 | { | |
228 | // | |
6d50f529 | 229 | // Returns the total charge from a not unfolded cluster |
bdb68f8c | 230 | // |
6d50f529 | 231 | |
232 | Float_t sum = 0.0; | |
233 | for (Int_t i = 0; i < 7; i++) { | |
234 | sum += fSignals[i]; | |
bdb68f8c | 235 | } |
6d50f529 | 236 | |
237 | return sum; | |
bdb68f8c | 238 | |
239 | } | |
f5375dcb | 240 | |
5843e420 | 241 | //_____________________________________________________________________________ |
834ac2c9 | 242 | Float_t AliTRDcluster::GetXloc(Double_t t0, Double_t vd, Double_t *const q, Double_t *const xq, Double_t z) |
5843e420 | 243 | { |
244 | // | |
834ac2c9 | 245 | // (Re)Calculate cluster position in the x direction in local chamber coordinates (with respect to the anode wire |
246 | // position) using all available information from tracking. | |
5843e420 | 247 | // Input parameters: |
834ac2c9 | 248 | // t0 - calibration aware trigger delay [us] |
249 | // vd - drift velocity in the region of the cluster [cm/us] | |
250 | // z - distance to the anode wire [cm]. By default 0.2 !! | |
251 | // q & xq - array of charges and cluster positions from previous clusters in the tracklet [a.u.] | |
5843e420 | 252 | // Output values : |
834ac2c9 | 253 | // return x position of the cluster with respect to the |
254 | // anode wire using all tracking information | |
5843e420 | 255 | // |
5843e420 | 256 | // The estimation of the radial position is based on calculating the drift time and the drift velocity at the point of |
257 | // estimation. The drift time can be estimated according to the expression: | |
258 | // BEGIN_LATEX | |
259 | // t_{drift} = t_{bin} - t_{0} - t_{cause}(x) - t_{TC}(q_{i-1}, q_{i-2}, ...) | |
260 | // END_LATEX | |
261 | // where t_0 is the delay of the trigger signal. t_cause is the causality delay between ionisation electrons hitting | |
262 | // the anode and the registration of maximum signal by the electronics - it is due to the rising time of the TRF | |
263 | // convoluted with the diffusion width. t_TC is the residual charge from previous bins due to residual tails after tail | |
264 | // cancellation. | |
265 | // | |
266 | // The drift velocity is considered to vary linearly with the drift length (independent of the distance to the anode wire | |
267 | // in the z direction). Thus one can write the calculate iteratively the drift length from the expression: | |
268 | // BEGIN_LATEX | |
269 | // x = t_{drift}(x)*v_{drfit}(x) | |
270 | // END_LATEX | |
271 | // | |
272 | // Authors | |
273 | // Alex Bercuci <A.Bercuci@gsi.de> | |
274 | // | |
275 | ||
834ac2c9 | 276 | AliTRDCommonParam *cp = AliTRDCommonParam::Instance(); |
277 | Double_t fFreq = cp->GetSamplingFrequency(); | |
278 | //drift time corresponding to the center of the time bin | |
279 | Double_t td = (fPadTime + .5)/fFreq; // [us] | |
5843e420 | 280 | if(td < t0+2.5) return 0.; // do not calculate radial posion of clusters in the amplification region |
281 | ||
282 | // correction for t0 | |
283 | td -= t0; | |
284 | ||
285 | Double_t x = vd*td, xold=0.; | |
286 | Float_t tc0 = 0.244, // TRF rising time 0.2us | |
287 | dtcdx = 0.009, // diffusion contribution to the rising time of the signal | |
834ac2c9 | 288 | kTC = 0.; // tail cancellation residual |
5843e420 | 289 | while(TMath::Abs(x-xold)>1.e-3){ // convergence on 10um level |
290 | xold = x; | |
291 | Float_t tc = tc0 - dtcdx*x; | |
292 | Float_t tq = 0.; | |
834ac2c9 | 293 | if(q && xq){ |
294 | for(Int_t iq=0; iq<3; iq++) tq += q[iq]*TMath::Exp(-kTC*(x - xq[iq])); | |
5843e420 | 295 | } |
8d2bec9e | 296 | Float_t vdcorr = x/cp->TimeStruct(vd, x+.5*AliTRDgeometry::CamHght(), z); |
834ac2c9 | 297 | x = (td - tc - tq) * vdcorr; |
5843e420 | 298 | } |
299 | return x; | |
300 | } | |
301 | ||
302 | //_____________________________________________________________________________ | |
834ac2c9 | 303 | Float_t AliTRDcluster::GetYloc(Double_t s2, Double_t W, Double_t xd, Double_t wt, Double_t *const y1, Double_t *const y2) |
5843e420 | 304 | { |
305 | // | |
306 | // (Re)Calculate cluster position in the y direction in local chamber coordinates using all available information from tracking. | |
834ac2c9 | 307 | // |
5843e420 | 308 | // Input parameters: |
309 | // s2 - sigma of gaussian parameterization (see bellow for the exact parameterization) | |
310 | // W - pad width | |
834ac2c9 | 311 | // xd - drift length (with respect to the anode wire) [cm] |
312 | // wt - omega*tau = tg(a_L) | |
5843e420 | 313 | // Output values : |
314 | // y1 and y2 - partial positions based on 2 pads clusters | |
315 | // return y position of the cluster from all information | |
316 | // | |
5843e420 | 317 | // Estimation of y coordinate is based on the gaussian approximation of the PRF. Thus one may |
318 | // calculate the y position knowing the signals q_i-1, q_i and q_i+1 in the 3 adiacent pads by: | |
319 | // BEGIN_LATEX | |
320 | // y = #frac{1}{w_{1}+w_{2}}#[]{w_{1}#(){y_{0}-#frac{W}{2}+#frac{s^{2}}{W}ln#frac{q_{i}}{q_{i-1}}}+w_{2}#(){y_{0}+ #frac{W}{2}+#frac{s^{2}}{W}ln#frac{q_{i+1}}{q_{i}}}} | |
321 | // END_LATEX | |
322 | // where W is the pad width, y_0 is the position of the center pad and s^2 is given by | |
323 | // BEGIN_LATEX | |
324 | // s^{2} = s^{2}_{0} + s^{2}_{diff} (x,B) + #frac{tg^{2}(#phi-#alpha_{L})*l^{2}}{12} | |
325 | // END_LATEX | |
326 | // with s_0 being the PRF for 0 drift and track incidence phi equal to the lorentz angle a_L and the diffusion term | |
327 | // being described by: | |
328 | // BEGIN_LATEX | |
329 | // s_{diff} (x,B) = #frac{D_{L}#sqrt{x}}{1+#(){#omega#tau}^{2}} | |
330 | // END_LATEX | |
331 | // with x being the drift length. The weights w_1 and w_2 are taken to be q_i-1^2 and q_i+1^2 respectively | |
332 | // | |
834ac2c9 | 333 | // Authors |
334 | // Alex Bercuci <A.Bercuci@gsi.de> | |
335 | // Theodor Rascanu <trascanu@stud.uni-frankfurt.de> | |
336 | // | |
5843e420 | 337 | Float_t y0 = GetY()-W*fCenter; |
338 | Double_t w1 = fSignals[2]*fSignals[2]; | |
339 | Double_t w2 = fSignals[4]*fSignals[4]; | |
834ac2c9 | 340 | Float_t y1r = fSignals[2]>0 ? (y0 - .5*W + s2*TMath::Log(fSignals[3]/(Float_t)fSignals[2])/W) : 0.; |
341 | Float_t y2r = fSignals[4]>0 ? (y0 + .5*W + s2*TMath::Log(fSignals[4]/(Float_t)fSignals[3])/W) : 0.; | |
5843e420 | 342 | |
834ac2c9 | 343 | if(y1) (*y1) = y1r; |
344 | if(y2) (*y2) = y2r; | |
345 | ||
346 | Double_t ld = TMath::Max(xd - 0.*AliTRDgeometry::CamHght(), 0.); | |
5843e420 | 347 | |
834ac2c9 | 348 | return (w1*y1r+w2*y2r)/(w1+w2) - ld*wt; |
5843e420 | 349 | } |
203967fc | 350 | |
351 | //_____________________________________________________________________________ | |
352 | Bool_t AliTRDcluster::IsEqual(const TObject *o) const | |
353 | { | |
354 | // | |
355 | // Compare relevant information of this cluster with another one | |
356 | // | |
357 | ||
358 | const AliTRDcluster *inCluster = dynamic_cast<const AliTRDcluster*>(o); | |
359 | if (!o || !inCluster) return kFALSE; | |
360 | ||
361 | if ( AliCluster::GetX() != inCluster->GetX() ) return kFALSE; | |
362 | if ( AliCluster::GetY() != inCluster->GetY() ) return kFALSE; | |
363 | if ( AliCluster::GetZ() != inCluster->GetZ() ) return kFALSE; | |
364 | if ( fQ != inCluster->fQ ) return kFALSE; | |
365 | if ( fDetector != inCluster->fDetector ) return kFALSE; | |
366 | if ( fPadCol != inCluster->fPadCol ) return kFALSE; | |
367 | if ( fPadRow != inCluster->fPadRow ) return kFALSE; | |
368 | if ( fPadTime != inCluster->fPadTime ) return kFALSE; | |
369 | if ( fClusterMasking != inCluster->fClusterMasking ) return kFALSE; | |
370 | if ( IsInChamber() != inCluster->IsInChamber() ) return kFALSE; | |
371 | if ( IsShared() != inCluster->IsShared() ) return kFALSE; | |
372 | if ( IsUsed() != inCluster->IsUsed() ) return kFALSE; | |
373 | ||
374 | return kTRUE; | |
375 | } | |
376 | ||
377 | //_____________________________________________________________________________ | |
378 | void AliTRDcluster::Print(Option_t *o) const | |
379 | { | |
380 | AliInfo(Form("Det[%3d] LTrC[%7.2f %7.2f %7.2f] Q[%f] Stat[in(%c) use(%c) sh(%c)]", | |
381 | fDetector, GetX(), GetY(), GetZ(), fQ, | |
382 | IsInChamber() ? 'y' : 'n', IsUsed() ? 'y' : 'n', IsShared() ? 'y' : 'n')); | |
383 | ||
384 | if(strcmp(o, "a")!=0) return; | |
385 | AliInfo(Form("LChC[c(%3d) r(%2d) t(%2d)] t-t0[%2d] Npad[%d] cen[%5.3f] mask[%d]", fPadCol, fPadRow, fPadTime, fLocalTimeBin, fNPads, fCenter, fClusterMasking)); | |
386 | AliInfo(Form("Signals[%3d %3d %3d %3d %3d %3d %3d]", fSignals[0], fSignals[1], fSignals[2], fSignals[3], fSignals[4], fSignals[5], fSignals[6])); | |
387 | } | |
388 | ||
389 | ||
f5375dcb | 390 | //_____________________________________________________________________________ |
391 | void AliTRDcluster::SetPadMaskedPosition(UChar_t position) | |
392 | { | |
393 | // | |
394 | // store the pad corruption position code | |
395 | // | |
396 | // Code: 1 = left cluster | |
397 | // 2 = middle cluster; | |
398 | // 4 = right cluster | |
399 | // | |
400 | for(Int_t ipos = 0; ipos < 3; ipos++) | |
401 | if(TESTBIT(position, ipos)) | |
402 | SETBIT(fClusterMasking, ipos); | |
403 | } | |
404 | ||
405 | //_____________________________________________________________________________ | |
406 | void AliTRDcluster::SetPadMaskedStatus(UChar_t status) | |
407 | { | |
408 | // | |
409 | // store the status of the corrupted pad | |
410 | // | |
411 | // Code: 2 = noisy | |
412 | // 4 = Bridged Left | |
413 | // 8 = Bridged Right | |
414 | // 32 = Not Connected | |
415 | for(Int_t ipos = 0; ipos < 5; ipos++) | |
416 | if(TESTBIT(status, ipos)) | |
417 | SETBIT(fClusterMasking, ipos + 3); | |
418 | } |