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37c55dc0 | 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 | ||
0d0e6995 | 16 | /* $Id$ */ |
17 | ||
4347b38f | 18 | //____________________________________________________________________ |
42403906 | 19 | // |
4347b38f | 20 | // This is a class that constructs ReconstParticles (reconstructed |
21 | // particles) out of Digits | |
22 | // | |
23 | // | |
24 | // This class reads either digits from a TClonesArray or raw data from | |
25 | // a DDL file (or similar), and stores the read ADC counts in an | |
26 | // internal cache (fAdcs). | |
27 | // | |
28 | // From the cached values it then calculates the number of particles | |
29 | // that hit a region of the FMDs, as specified by the user. | |
30 | // | |
31 | // The reconstruction can be done in two ways: Either via counting the | |
32 | // number of empty strips (Poisson method), or by converting the ADC | |
33 | // signal to an energy deposition, and then dividing by the typical | |
34 | // energy loss of a particle. | |
35 | // | |
36 | // Currently, this class only reads the digits from a TClonesArray, | |
37 | // and the Poission method for reconstruction. | |
38 | // | |
37c55dc0 | 39 | // |
40 | //-- Authors: Evgeny Karpechev(INR) and Alla Maevsksia | |
4347b38f | 41 | // Latest changes by Christian Holm Christensen <cholm@nbi.dk> |
42 | // | |
43 | // | |
44 | //____________________________________________________________________ | |
37c55dc0 | 45 | |
8f1cfb0c | 46 | #include "AliFMD.h" |
47 | #include "AliFMDDigit.h" | |
48 | #include "AliFMDParticles.h" | |
49 | #include "AliFMDReconstructor.h" | |
50 | #include "AliAltroBuffer.h" | |
51 | #include "AliLog.h" | |
52 | #include "AliRun.h" | |
53 | #include "AliRunLoader.h" | |
54 | #include "AliLoader.h" | |
55 | #include "AliHeader.h" | |
56 | #include "AliGenEventHeader.h" | |
57 | #include "AliFMDRawStream.h" | |
58 | #include "AliRawReader.h" | |
4347b38f | 59 | |
60 | //____________________________________________________________________ | |
61 | ClassImp(AliFMDReconstructor); | |
37c55dc0 | 62 | |
4347b38f | 63 | //____________________________________________________________________ |
64 | AliFMDReconstructor::AliFMDReconstructor() | |
65 | : AliReconstructor(), | |
66 | fAdcs(kMaxDetectors, kMaxRings, kMaxSectors, kMaxStrips), | |
67 | fDeltaEta(0), | |
68 | fDeltaPhi(0), | |
69 | fThreshold(0), | |
70 | fPedestal(0), | |
71 | fPedestalWidth(0) | |
72 | { | |
42403906 | 73 | // Make a new FMD reconstructor object - default CTOR. |
4347b38f | 74 | SetDeltaEta(); |
75 | SetDeltaPhi(); | |
76 | SetThreshold(); | |
77 | SetPedestal(); | |
78 | ||
79 | fParticles = new TClonesArray("AliFMDParticles", 1000); | |
80 | fFMDLoader = 0; | |
81 | fRunLoader = 0; | |
82 | fFMD = 0; | |
83 | } | |
84 | ||
42403906 | 85 | |
86 | //____________________________________________________________________ | |
87 | AliFMDReconstructor::AliFMDReconstructor(const AliFMDReconstructor& other) | |
88 | : AliReconstructor(), | |
89 | fAdcs(kMaxDetectors, kMaxRings, kMaxSectors, kMaxStrips), | |
90 | fDeltaEta(0), | |
91 | fDeltaPhi(0), | |
92 | fThreshold(0), | |
93 | fPedestal(0), | |
94 | fPedestalWidth(0) | |
95 | { | |
96 | // Make a new FMD reconstructor object - default CTOR. | |
97 | SetDeltaEta(other.fDeltaEta); | |
98 | SetDeltaPhi(other.fDeltaPhi); | |
99 | SetThreshold(other.fThreshold); | |
100 | SetPedestal(other.fPedestal, other.fPedestalWidth); | |
101 | ||
102 | // fParticles = new TClonesArray("AliFMDParticles", 1000); | |
103 | fFMDLoader = other.fFMDLoader; | |
104 | fRunLoader = other.fRunLoader; | |
105 | fFMD = other.fFMD; | |
106 | } | |
107 | ||
108 | ||
109 | //____________________________________________________________________ | |
110 | AliFMDReconstructor& | |
111 | AliFMDReconstructor::operator=(const AliFMDReconstructor& other) | |
112 | { | |
113 | // Make a new FMD reconstructor object - default CTOR. | |
114 | SetDeltaEta(other.fDeltaEta); | |
115 | SetDeltaPhi(other.fDeltaPhi); | |
116 | SetThreshold(other.fThreshold); | |
117 | SetPedestal(other.fPedestal, other.fPedestalWidth); | |
118 | ||
119 | // fParticles = new TClonesArray("AliFMDParticles", 1000); | |
120 | fFMDLoader = other.fFMDLoader; | |
121 | fRunLoader = other.fRunLoader; | |
122 | fFMD = other.fFMD; | |
123 | ||
124 | return *this; | |
125 | } | |
126 | ||
4347b38f | 127 | //____________________________________________________________________ |
128 | void | |
129 | AliFMDReconstructor::SetPedestal(Float_t mean, Float_t width) | |
130 | { | |
131 | // Set the pedestal, and pedestal width | |
132 | fPedestal = mean; | |
133 | fPedestalWidth = width; | |
134 | } | |
135 | ||
136 | //____________________________________________________________________ | |
137 | void | |
138 | AliFMDReconstructor::Reconstruct(AliRunLoader* runLoader, | |
139 | AliRawReader* rawReader) const | |
140 | { | |
141 | // Collects all digits in the same active volume into number of | |
142 | // particles | |
143 | // | |
144 | // Reconstruct number of particles in given group of pads for given | |
145 | // FMDvolume determined by numberOfVolume, | |
146 | // numberOfMinSector, numberOfMaxSector, numberOfMinRing, | |
147 | // numberOgMaxRing | |
148 | // | |
149 | // The reconstruction method is choosen based on the number of empty | |
150 | // strips. | |
151 | fParticles->Clear(); | |
152 | if (!runLoader) { | |
153 | Error("Exec","Run Loader loader is NULL - Session not opened"); | |
154 | return; | |
155 | } | |
156 | fRunLoader = runLoader; | |
157 | fFMDLoader = runLoader->GetLoader("FMDLoader"); | |
158 | if (!fFMDLoader) | |
159 | Fatal("AliFMDReconstructor","Can not find FMD (loader) " | |
160 | "in specified event"); | |
dc8af42e | 161 | |
4347b38f | 162 | // Get the AliRun object |
163 | if (!fRunLoader->GetAliRun()) fRunLoader->LoadgAlice(); | |
164 | ||
165 | // Get the AliFMD object | |
166 | fFMD = static_cast<AliFMD*>(fRunLoader->GetAliRun()->GetDetector("FMD")); | |
167 | if (!fFMD) { | |
168 | AliError("Can not get FMD from gAlice"); | |
169 | return; | |
170 | } | |
171 | fFMDLoader->LoadRecPoints("RECREATE"); | |
dc8af42e | 172 | |
4347b38f | 173 | if (!fRunLoader->TreeE()) fRunLoader->LoadHeader(); |
88cb7938 | 174 | |
4347b38f | 175 | TClonesArray* digits = fFMD->Digits(); |
176 | if (rawReader) { | |
177 | Int_t event = 0; | |
178 | while (rawReader->NextEvent()) { | |
179 | ProcessEvent(event, rawReader, digits); | |
180 | event++; | |
181 | } | |
182 | } | |
183 | else { | |
184 | Int_t nEvents= Int_t(fRunLoader->TreeE()->GetEntries()); | |
185 | for(Int_t event = 0; event < nEvents; event++) | |
186 | ProcessEvent(event, 0, digits); | |
187 | } | |
88cb7938 | 188 | |
dc8af42e | 189 | |
4347b38f | 190 | fFMDLoader->UnloadRecPoints(); |
191 | fFMDLoader = 0; | |
192 | fRunLoader = 0; | |
193 | fFMD = 0; | |
194 | } | |
dc8af42e | 195 | |
4347b38f | 196 | //____________________________________________________________________ |
197 | void | |
198 | AliFMDReconstructor::Reconstruct(AliRunLoader* runLoader) const | |
dc8af42e | 199 | { |
4347b38f | 200 | // Collects all digits in the same active volume into number of |
201 | // particles | |
202 | // | |
203 | // Reconstruct number of particles in given group of pads for given | |
204 | // FMDvolume determined by numberOfVolume, | |
205 | // numberOfMinSector, numberOfMaxSector, numberOfMinRing, | |
206 | // numberOgMaxRing | |
207 | // | |
208 | // The reconstruction method is choosen based on the number of empty | |
209 | // strips. | |
210 | Reconstruct(runLoader, 0); | |
211 | } | |
212 | ||
213 | ||
214 | //____________________________________________________________________ | |
215 | void | |
216 | AliFMDReconstructor::ProcessEvent(Int_t event, | |
217 | AliRawReader* reader, | |
218 | TClonesArray* digits) const | |
219 | { | |
42403906 | 220 | // Process one event read from either a clones array or from a a raw |
221 | // data reader. | |
4347b38f | 222 | fRunLoader->GetEvent(event) ; |
223 | //event z-vertex for correction eta-rad dependence | |
224 | AliHeader *header = fRunLoader->GetHeader(); | |
225 | if (!header) | |
226 | Warning("ProcessEvent", "no AliHeader found!"); | |
227 | AliGenEventHeader* genHeader = (header ? header->GenEventHeader() : 0); | |
3d44ce66 | 228 | |
4347b38f | 229 | // Get the Z--coordinate from the event header |
230 | TArrayF o(3); | |
231 | if (genHeader) genHeader->PrimaryVertex(o); | |
232 | Float_t zVertex = o.At(2); | |
cb1df35e | 233 | |
4347b38f | 234 | // If the recontruction tree isn't loaded, load it |
235 | if(fFMDLoader->TreeR()==0) fFMDLoader->MakeTree("R"); | |
88cb7938 | 236 | |
4347b38f | 237 | //Make branches to hold the reconstructed particles |
238 | const Int_t kBufferSize = 16000; | |
239 | fFMDLoader->TreeR()->Branch("FMD", &fParticles, kBufferSize); | |
240 | ||
241 | // Load or recreate the digits | |
242 | if (fFMDLoader->LoadDigits((reader ? "UPDATE" : "READ"))) { | |
243 | if (!reader) { | |
244 | Error("Exec","Error occured while loading digits. Exiting."); | |
245 | return; | |
246 | } | |
46501dfb | 247 | |
4347b38f | 248 | } |
249 | // Get the digits tree | |
250 | TTree* digitTree = fFMDLoader->TreeD(); | |
251 | if (!digitTree) { | |
252 | if (!reader) { | |
253 | Error("Exec","Can not get Tree with Digits. " | |
254 | "Nothing to reconstruct - Exiting"); | |
255 | return; | |
256 | } | |
257 | fFMDLoader->MakeTree("D"); | |
258 | digitTree = fFMDLoader->TreeD(); | |
259 | ||
260 | } | |
261 | // Get the FMD branch holding the digits. | |
262 | TBranch *digitBranch = digitTree->GetBranch("FMD"); | |
263 | if (!digitBranch) { | |
264 | if (!reader) { | |
265 | Error("Exec", "No digit branch for the FMD found"); | |
266 | return; | |
267 | } | |
268 | fFMD->MakeBranchInTree(digitTree, fFMD->GetName(), &(digits), 4000, 0); | |
269 | } | |
270 | if (!reader) digitBranch->SetAddress(&digits); | |
271 | ||
272 | fEmptyStrips = 0; | |
273 | fTotalStrips = 0; | |
274 | Bool_t ok = kFALSE; | |
275 | if (reader) ok = ReadAdcs(reader); | |
276 | else if (digits) ok = ReadAdcs(digits); | |
277 | if (!ok) return; | |
278 | ||
279 | ReconstructFromCache(zVertex); | |
280 | ||
281 | if (reader) { | |
282 | digitTree->Fill(); | |
283 | fFMDLoader->WriteDigits("OVERWRITE"); | |
284 | } | |
285 | fFMDLoader->UnloadDigits(); | |
286 | fFMDLoader->TreeR()->Reset(); | |
287 | fFMDLoader->TreeR()->Fill(); | |
288 | fFMDLoader->WriteRecPoints("OVERWRITE"); | |
289 | } | |
290 | ||
291 | //____________________________________________________________________ | |
292 | Bool_t | |
293 | AliFMDReconstructor::ReadAdcs(TClonesArray* digits) const | |
294 | { | |
42403906 | 295 | // Read the ADC values from a clones array. |
4347b38f | 296 | AliDebug(10, "Reading ADCs from Digits array"); |
297 | // read Digits, and reconstruct the particles | |
298 | if (!fFMDLoader->TreeD()->GetEvent(0)) return kFALSE; | |
299 | ||
300 | // Reads the digits from the array, and fills up the cache (fAdcs) | |
301 | fAdcs.Clear(); | |
302 | Int_t nDigits = digits->GetEntries(); | |
303 | for (Int_t digit = 0; digit < nDigits; digit++) { | |
304 | AliFMDDigit* fmdDigit = | |
305 | static_cast<AliFMDDigit*>(digits->UncheckedAt(digit)); | |
306 | ||
307 | ProcessDigit(fmdDigit); | |
308 | } //digit loop | |
309 | return kTRUE; | |
310 | } | |
311 | ||
312 | //____________________________________________________________________ | |
313 | Bool_t | |
314 | AliFMDReconstructor::ReadAdcs(AliRawReader* reader) const | |
315 | { | |
42403906 | 316 | // Read the ADC values from a raw data reader. |
4347b38f | 317 | AliDebug(10, "Reading ADCs from RawReader"); |
318 | // Reads the digits from a RAW data | |
319 | fAdcs.Clear(); | |
320 | // reader->Reset(); | |
321 | ||
322 | if (!reader->ReadHeader()) { | |
323 | Error("ReadAdcs", "Couldn't read header"); | |
324 | return kFALSE; | |
325 | } | |
326 | ||
327 | // Use AliAltroRawStream to read the ALTRO format. No need to | |
328 | // reinvent the wheel :-) | |
329 | AliFMDRawStream input(reader); | |
330 | // Select FMD DDL's | |
331 | reader->Select(AliFMD::kBaseDDL >> 8); | |
332 | ||
333 | Int_t oldDDL = -1; | |
334 | Int_t count = 0; | |
335 | UShort_t detector = 1; // Must be one here | |
336 | UShort_t oldDetector = 0; | |
337 | // Loop over data in file | |
338 | Bool_t next = kTRUE; | |
339 | ||
340 | // local Cache | |
341 | TArrayI counts(10); | |
342 | counts.Reset(-1); | |
343 | Int_t offset = 0; | |
344 | ||
345 | while (next) { | |
346 | next = input.Next(); | |
347 | ||
348 | ||
349 | count++; | |
350 | Int_t ddl = reader->GetDDLID(); | |
351 | if (ddl != oldDDL | |
352 | || input.IsNewStrip() | |
353 | || !next) { | |
354 | // Make a new digit, if we have some data! | |
355 | if (counts[0] >= 0) { | |
356 | // Got a new strip. | |
357 | AliDebug(10, Form("Add a new strip: FMD%d%c[%2d,%3d] " | |
358 | "(current: FMD%d%c[%2d,%3d])", | |
359 | oldDetector, input.PrevRing(), | |
360 | input.PrevSector() , input.PrevStrip(), | |
361 | detector , input.Ring(), input.Sector(), | |
362 | input.Strip())); | |
363 | fFMD->AddDigit(oldDetector, | |
364 | input.PrevRing(), | |
365 | input.PrevSector(), | |
366 | input.PrevStrip(), | |
367 | counts[0], counts[1], counts[2]); | |
368 | AliFMDDigit* digit = | |
369 | static_cast<AliFMDDigit*>(fFMD->Digits()-> | |
370 | UncheckedAt(fFMD->GetNdigits()-1)); | |
371 | ProcessDigit(digit); | |
372 | } | |
373 | ||
374 | if (!next) { | |
375 | AliDebug(10, Form("Read %d channels for FMD%d", | |
376 | count + 1, detector)); | |
377 | break; | |
378 | } | |
379 | ||
380 | ||
381 | // If we got a new DDL, it means we have a new detector. | |
382 | if (ddl != oldDDL) { | |
383 | if (detector != 0) | |
384 | AliDebug(10, Form("Read %d channels for FMD%d", | |
385 | count + 1, detector)); | |
386 | // Reset counts, and update the DDL cache | |
387 | count = 0; | |
388 | oldDDL = ddl; | |
389 | // Check that we're processing a FMD detector | |
390 | Int_t detId = reader->GetDetectorID(); | |
391 | if (detId != (AliFMD::kBaseDDL >> 8)) { | |
392 | Error("ReadAdcs", "Detector ID %d != %d", | |
393 | detId, (AliFMD::kBaseDDL >> 8)); | |
394 | break; | |
46501dfb | 395 | } |
4347b38f | 396 | // Figure out what detector we're deling with |
397 | oldDetector = detector; | |
398 | switch (ddl) { | |
399 | case 0: detector = 1; break; | |
400 | case 1: detector = 2; break; | |
401 | case 2: detector = 3; break; | |
402 | default: | |
403 | Error("ReadAdcs", "Unknown DDL 0x%x for FMD", ddl); | |
404 | return kFALSE; | |
46501dfb | 405 | } |
4347b38f | 406 | AliDebug(10, Form("Reading ADCs for 0x%x - That is FMD%d", |
407 | reader->GetEquipmentId(), detector)); | |
408 | } | |
409 | counts.Reset(-1); | |
410 | offset = 0; | |
411 | } | |
412 | ||
413 | counts[offset] = input.Count(); | |
414 | offset++; | |
415 | ||
416 | AliDebug(10, Form("ADC of FMD%d%c[%2d,%3d] += %d", | |
417 | detector, input.Ring(), input.Sector(), | |
418 | input.Strip(), input.Count())); | |
419 | oldDetector = detector; | |
420 | } | |
421 | return kTRUE; | |
422 | } | |
88cb7938 | 423 | |
4347b38f | 424 | //____________________________________________________________________ |
425 | void | |
426 | AliFMDReconstructor::ProcessDigit(AliFMDDigit* digit) const | |
427 | { | |
428 | // Process a digit. Derived classes can overload this member | |
429 | // function to do stuff to the digit. However, it should write the | |
430 | // ADC count to the internal cache | |
431 | // | |
432 | // fAdcs(detector - 1, ring, sector, strip) = counts; | |
433 | // | |
434 | // In this implementation, we count the number of strips below | |
435 | // threshold. This we do to later choose what kind of | |
436 | // reconstruction algorithm we'd like to use. | |
437 | // | |
438 | UShort_t detector = digit->Detector(); | |
439 | Char_t ring = digit->Ring(); | |
440 | UShort_t sector = digit->Sector(); | |
441 | UShort_t strip = digit->Strip(); | |
442 | ||
443 | UShort_t counts = SubtractPedestal(digit); | |
444 | ||
445 | fAdcs(detector - 1, ring, sector, strip) = counts; | |
446 | if (counts < fThreshold) fEmptyStrips++; | |
447 | fTotalStrips++; | |
448 | } | |
1a42d4f2 | 449 | |
4347b38f | 450 | //____________________________________________________________________ |
451 | UShort_t | |
452 | AliFMDReconstructor::SubtractPedestal(AliFMDDigit* digit) const | |
453 | { | |
454 | // Member function to subtract the pedestal from a digit | |
455 | // This implementation does nothing, but a derived class could over | |
456 | // load this to subtract a pedestal that was given in a database or | |
457 | // something like that. | |
3d44ce66 | 458 | |
4347b38f | 459 | Int_t counts = |
460 | TMath::Max(Int_t(digit->Count1() - fPedestal - 3 * fPedestalWidth), 0); | |
461 | if (digit->Count2() >= 0) | |
462 | counts += | |
463 | TMath::Max(Int_t(digit->Count2() - fPedestal - 3 * fPedestalWidth), 0); | |
464 | if (digit->Count3() >= 0) | |
465 | counts += | |
466 | TMath::Max(Int_t(digit->Count3() - fPedestal - 3 * fPedestalWidth), 0); | |
467 | ||
468 | if (counts < 0) counts = 0; | |
469 | return UShort_t(counts); | |
88cb7938 | 470 | } |
dc8af42e | 471 | |
4347b38f | 472 | //____________________________________________________________________ |
473 | void | |
474 | AliFMDReconstructor::ReconstructFromCache(Float_t zVertex) const | |
475 | { | |
476 | // Based on the information in the cache, do the reconstruction. | |
477 | Int_t nRecon = 0; | |
478 | // Loop over the detectors | |
479 | for (Int_t i = 1; i <= 3; i++) { | |
480 | AliFMDSubDetector* sub = 0; | |
481 | switch (i) { | |
482 | case 1: sub = fFMD->GetFMD1(); break; | |
483 | case 2: sub = fFMD->GetFMD2(); break; | |
484 | case 3: sub = fFMD->GetFMD3(); break; | |
485 | } | |
486 | if (!sub) continue; | |
487 | ||
488 | // Loop over the rings in the detector | |
489 | for (Int_t j = 0; j < 2; j++) { | |
490 | Float_t rZ = 0; | |
491 | AliFMDRing* r = 0; | |
492 | switch (j) { | |
493 | case 0: r = sub->GetInner(); rZ = sub->GetInnerZ(); break; | |
494 | case 1: r = sub->GetOuter(); rZ = sub->GetOuterZ(); break; | |
495 | } | |
496 | if (!r) continue; | |
497 | ||
498 | // Calculate low/high theta and eta | |
499 | // FIXME: Is this right? | |
500 | Float_t realZ = zVertex + rZ; | |
501 | Float_t thetaOut = TMath::ATan2(r->GetHighR(), realZ); | |
502 | Float_t thetaIn = TMath::ATan2(r->GetLowR(), realZ); | |
503 | Float_t etaOut = - TMath::Log(TMath::Tan(thetaOut / 2)); | |
504 | Float_t etaIn = - TMath::Log(TMath::Tan(thetaIn / 2)); | |
505 | if (TMath::Abs(etaOut) > TMath::Abs(etaIn)) { | |
506 | Float_t tmp = etaIn; | |
507 | etaIn = etaOut; | |
508 | etaOut = tmp; | |
509 | } | |
510 | ||
511 | //------------------------------------------------------------- | |
512 | // | |
513 | // Here starts poisson method | |
514 | // | |
515 | // Calculate eta step per strip, number of eta steps, number of | |
516 | // phi steps, and check the sign of the eta increment | |
517 | Float_t stripEta = (Float_t(r->GetNStrips()) / (etaIn - etaOut)); | |
518 | Int_t nEta = Int_t(TMath::Abs(etaIn - etaOut) / fDeltaEta); | |
519 | Int_t nPhi = Int_t(360. / fDeltaPhi); | |
520 | Float_t sign = TMath::Sign(Float_t(1.), etaIn); | |
121a60bd | 521 | |
4347b38f | 522 | AliDebug(10, Form("FMD%d%c Eta range: %f, %f %d Phi steps", |
523 | sub->GetId(), r->GetId(), etaOut, etaIn, nPhi)); | |
524 | ||
525 | // Loop over relevant phi values | |
526 | for (Int_t p = 0; p < nPhi; p++) { | |
527 | Float_t minPhi = p * fDeltaPhi; | |
528 | Float_t maxPhi = minPhi + fDeltaPhi; | |
529 | UShort_t minSector = UShort_t(minPhi / 360) * r->GetNSectors(); | |
530 | UShort_t maxSector = UShort_t(maxPhi / 360) * r->GetNSectors(); | |
531 | ||
532 | AliDebug(10, Form(" Now in phi range %f, %f (sectors %d,%d)", | |
533 | minPhi, maxPhi, minSector, maxSector)); | |
534 | // Loop over relevant eta values | |
535 | for (Int_t e = nEta; e >= 0; --e) { | |
536 | Float_t maxEta = etaIn - sign * e * fDeltaEta; | |
537 | Float_t minEta = maxEta - sign * fDeltaEta; | |
538 | if (sign > 0) minEta = TMath::Max(minEta, etaOut); | |
539 | else minEta = TMath::Min(minEta, etaOut); | |
540 | Float_t theta1 = 2 * TMath::ATan(TMath::Exp(-minEta)); | |
541 | Float_t theta2 = 2 * TMath::ATan(TMath::Exp(-maxEta)); | |
542 | Float_t minR = TMath::Abs(realZ * TMath::Tan(theta2)); | |
543 | Float_t maxR = TMath::Abs(realZ * TMath::Tan(theta1)); | |
544 | UShort_t minStrip = UShort_t((etaIn - maxEta) * stripEta + 0.5); | |
545 | UShort_t maxStrip = UShort_t((etaIn - minEta) * stripEta + 0.5); | |
546 | ||
547 | AliDebug(10, Form(" Now in eta range %f, %f (strips %d, %d)\n" | |
548 | " [radii %f, %f, thetas %f, %f, sign %d]", | |
549 | minEta, maxEta, minStrip, maxStrip, | |
550 | minR, maxR, theta1, theta2, sign)); | |
551 | ||
552 | // Count number of empty strips | |
553 | Int_t emptyStrips = 0; | |
554 | for (Int_t sector = minSector; sector < maxSector; sector++) | |
555 | for (Int_t strip = minStrip; strip < maxStrip; strip++) | |
556 | if (fAdcs(sub->GetId() - 1, r->GetId(), sector, strip) | |
557 | < fThreshold) emptyStrips++; | |
558 | ||
559 | // The total number of strips | |
560 | Float_t nTotal = (maxSector - minSector) * (maxStrip - minStrip); | |
561 | ||
562 | // Log ratio of empty to total number of strips | |
563 | AliDebug(10, Form("Lambda= %d / %d = %f", | |
564 | emptyStrips, nTotal, | |
565 | Float_t(emptyStrips) / nTotal)); | |
566 | ||
567 | Double_t lambda = (emptyStrips > 0 ? | |
568 | - TMath::Log(Double_t(emptyStrips) / nTotal) : | |
569 | 1); | |
570 | ||
571 | // The reconstructed number of particles is then given by | |
572 | Int_t reconstructed = Int_t(lambda * nTotal + 0.5); | |
573 | ||
574 | // Add a AliFMDParticles to the reconstruction tree. | |
575 | new((*fParticles)[nRecon]) | |
576 | AliFMDParticles(sub->GetId(), r->GetId(), | |
577 | minSector, maxSector, minStrip, maxStrip, | |
578 | minEta, maxEta, minPhi, maxPhi, | |
579 | reconstructed, AliFMDParticles::kPoission); | |
580 | nRecon++; | |
581 | } // phi | |
582 | } // eta | |
583 | } // ring | |
584 | } // detector | |
585 | } | |
586 | ||
587 | ||
588 | //____________________________________________________________________ | |
589 | void | |
590 | AliFMDReconstructor::FillESD(AliRunLoader* /*fRunLoader*/, | |
591 | AliESD* /*esd*/) const | |
121a60bd | 592 | { |
42403906 | 593 | // nothing to be done |
121a60bd | 594 | |
595 | } | |
596 | ||
42403906 | 597 | //____________________________________________________________________ |
598 | // | |
599 | // EOF | |
600 | // |