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02a27b50 | 1 | /************************************************************************** |
2 | * Copyright(c) 2004, 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 | /* $Id$ */ | |
16 | /** @file AliFMDBaseDigitizer.cxx | |
17 | @author Christian Holm Christensen <cholm@nbi.dk> | |
18 | @date Mon Mar 27 12:38:26 2006 | |
19 | @brief FMD Digitizers implementation | |
20 | @ingroup FMD_sim | |
21 | */ | |
22 | ////////////////////////////////////////////////////////////////////////////// | |
23 | // | |
24 | // This class contains the procedures simulation ADC signal for the | |
25 | // Forward Multiplicity detector : Hits->Digits and Hits->SDigits | |
26 | // | |
27 | // Digits consists of | |
28 | // - Detector # | |
29 | // - Ring ID | |
30 | // - Sector # | |
31 | // - Strip # | |
32 | // - ADC count in this channel | |
33 | // | |
34 | // Digits consists of | |
35 | // - Detector # | |
36 | // - Ring ID | |
37 | // - Sector # | |
38 | // - Strip # | |
39 | // - Total energy deposited in the strip | |
40 | // - ADC count in this channel | |
41 | // | |
42 | // As the Digits and SDigits have so much in common, the classes | |
43 | // AliFMDDigitizer and AliFMDSDigitizer are implemented via a base | |
44 | // class AliFMDBaseDigitizer. | |
45 | // | |
46 | // +---------------------+ | |
47 | // | AliFMDBaseDigitizer | | |
48 | // +---------------------+ | |
49 | // ^ | |
50 | // | | |
51 | // +----------+---------+ | |
52 | // | | | |
53 | // +-----------------+ +------------------+ | |
54 | // | AliFMDDigitizer | | AliFMDSDigitizer | | |
55 | // +-----------------+ +------------------+ | |
56 | // | |
57 | // These classes has several paramters: | |
58 | // | |
59 | // fPedestal | |
60 | // fPedestalWidth | |
61 | // (Only AliFMDDigitizer) | |
62 | // Mean and width of the pedestal. The pedestal is simulated | |
63 | // by a Guassian, but derived classes my override MakePedestal | |
64 | // to simulate it differently (or pick it up from a database). | |
65 | // | |
66 | // fVA1MipRange | |
67 | // The dymamic MIP range of the VA1_ALICE pre-amplifier chip | |
68 | // | |
69 | // fAltroChannelSize | |
70 | // The largest number plus one that can be stored in one | |
71 | // channel in one time step in the ALTRO ADC chip. | |
72 | // | |
73 | // fSampleRate | |
74 | // How many times the ALTRO ADC chip samples the VA1_ALICE | |
75 | // pre-amplifier signal. The VA1_ALICE chip is read-out at | |
76 | // 10MHz, while it's possible to drive the ALTRO chip at | |
77 | // 25MHz. That means, that the ALTRO chip can have time to | |
78 | // sample each VA1_ALICE signal up to 2 times. Although it's | |
79 | // not certain this feature will be used in the production, | |
80 | // we'd like have the option, and so it should be reflected in | |
81 | // the code. | |
82 | // | |
83 | // | |
84 | // The shaping function of the VA1_ALICE is generally given by | |
85 | // | |
86 | // f(x) = A(1 - exp(-Bx)) | |
87 | // | |
88 | // where A is the total charge collected in the pre-amp., and B is a | |
89 | // paramter that depends on the shaping time of the VA1_ALICE circut. | |
90 | // | |
91 | // When simulating the shaping function of the VA1_ALICe | |
92 | // pre-amp. chip, we have to take into account, that the shaping | |
93 | // function depends on the previous value of read from the pre-amp. | |
94 | // | |
95 | // That results in the following algorithm: | |
96 | // | |
97 | // last = 0; | |
98 | // FOR charge IN pre-amp. charge train DO | |
99 | // IF last < charge THEN | |
100 | // f(t) = (charge - last) * (1 - exp(-B * t)) + last | |
101 | // ELSE | |
102 | // f(t) = (last - charge) * exp(-B * t) + charge) | |
103 | // ENDIF | |
104 | // FOR i IN # samples DO | |
105 | // adc_i = f(i / (# samples)) | |
106 | // DONE | |
107 | // last = charge | |
108 | // DONE | |
109 | // | |
110 | // Here, | |
111 | // | |
112 | // pre-amp. charge train | |
113 | // is a series of 128 charges read from the VA1_ALICE chip | |
114 | // | |
115 | // # samples | |
116 | // is the number of times the ALTRO ADC samples each of the 128 | |
117 | // charges from the pre-amp. | |
118 | // | |
119 | // Where Q is the total charge collected by the VA1_ALICE | |
120 | // pre-amplifier. Q is then given by | |
121 | // | |
122 | // E S | |
123 | // Q = - - | |
124 | // e R | |
125 | // | |
126 | // where E is the total energy deposited in a silicon strip, R is the | |
127 | // dynamic range of the VA1_ALICE pre-amp (fVA1MipRange), e is the | |
128 | // energy deposited by a single MIP, and S ALTRO channel size in each | |
129 | // time step (fAltroChannelSize). | |
130 | // | |
131 | // The energy deposited per MIP is given by | |
132 | // | |
133 | // e = M * rho * w | |
134 | // | |
135 | // where M is the universal number 1.664, rho is the density of | |
136 | // silicon, and w is the depth of the silicon sensor. | |
137 | // | |
138 | // The final ADC count is given by | |
139 | // | |
140 | // C' = C + P | |
141 | // | |
142 | // where P is the (randomized) pedestal (see MakePedestal) | |
143 | // | |
144 | // This class uses the class template AliFMDMap<Type> to make an | |
145 | // internal cache of the energy deposted of the hits. The class | |
146 | // template is instantasized as | |
147 | // | |
148 | // typedef AliFMDMap<std::pair<Float_t, UShort_t> > AliFMDEdepMap; | |
149 | // | |
150 | // The first member of the values is the summed energy deposition in a | |
151 | // given strip, while the second member of the values is the number of | |
152 | // hits in a given strip. Using the second member, it's possible to | |
153 | // do some checks on just how many times a strip got hit, and what | |
154 | // kind of error we get in our reconstructed hits. Note, that this | |
155 | // information is currently not written to the digits tree. I think a | |
156 | // QA (Quality Assurance) digit tree is better suited for that task. | |
157 | // However, the information is there to be used in the future. | |
158 | // | |
159 | // | |
160 | // Latest changes by Christian Holm Christensen | |
161 | // | |
162 | ////////////////////////////////////////////////////////////////////////////// | |
163 | ||
164 | // /1 | |
165 | // | A(-1 + B + exp(-B)) | |
166 | // | f(x) dx = ------------------- = 1 | |
167 | // | B | |
168 | // / 0 | |
169 | // | |
170 | // and B is the a parameter defined by the shaping time (fShapingTime). | |
171 | // | |
172 | // Solving the above equation, for A gives | |
173 | // | |
174 | // B | |
175 | // A = ---------------- | |
176 | // -1 + B + exp(-B) | |
177 | // | |
178 | // So, if we define the function g: [0,1] -> [0:1] by | |
179 | // | |
180 | // / v | |
181 | // | Bu + exp(-Bu) - Bv - exp(-Bv) | |
182 | // g(u,v) = | f(x) dx = -A ----------------------------- | |
183 | // | B | |
184 | // / u | |
185 | // | |
186 | // we can evaluate the ALTRO sample of the VA1_ALICE pre-amp between | |
187 | // any two times (u, v), by | |
188 | // | |
189 | // | |
190 | // B Bu + exp(-Bu) - Bv - exp(-Bv) | |
191 | // C = Q g(u,v) = - Q ---------------- ----------------------------- | |
192 | // -1 + B + exp(-B) B | |
193 | // | |
194 | // Bu + exp(-Bu) - Bv - exp(-Bv) | |
195 | // = - Q ----------------------------- | |
196 | // -1 + B + exp(-B) | |
197 | // | |
198 | ||
090026bf | 199 | #include <TMath.h> |
02a27b50 | 200 | #include <TTree.h> // ROOT_TTree |
201 | //#include <TRandom.h> // ROOT_TRandom | |
f95a63c4 | 202 | // #include <AliLog.h> // ALILOG_H |
203 | #include "AliFMDDebug.h" // Better debug macros | |
02a27b50 | 204 | #include "AliFMDBaseDigitizer.h" // ALIFMDDIGITIZER_H |
205 | #include "AliFMD.h" // ALIFMD_H | |
206 | #include "AliFMDGeometry.h" // ALIFMDGEOMETRY_H | |
207 | #include "AliFMDDetector.h" // ALIFMDDETECTOR_H | |
208 | #include "AliFMDRing.h" // ALIFMDRING_H | |
209 | #include "AliFMDHit.h" // ALIFMDHIT_H | |
6169f936 | 210 | // #include "AliFMDDigit.h" // ALIFMDDIGIT_H |
02a27b50 | 211 | #include "AliFMDParameters.h" // ALIFMDPARAMETERS_H |
6169f936 | 212 | // #include <AliRunDigitizer.h> // ALIRUNDIGITIZER_H |
02a27b50 | 213 | //#include <AliRun.h> // ALIRUN_H |
214 | #include <AliLoader.h> // ALILOADER_H | |
215 | #include <AliRunLoader.h> // ALIRUNLOADER_H | |
216 | ||
217 | //==================================================================== | |
218 | ClassImp(AliFMDBaseDigitizer) | |
219 | #if 0 | |
220 | ; // This is here to keep Emacs for indenting the next line | |
221 | #endif | |
222 | ||
223 | //____________________________________________________________________ | |
224 | AliFMDBaseDigitizer::AliFMDBaseDigitizer() | |
b5ee4425 | 225 | : fRunLoader(0), |
226 | fEdep(AliFMDMap::kMaxDetectors, | |
227 | AliFMDMap::kMaxRings, | |
228 | AliFMDMap::kMaxSectors, | |
229 | AliFMDMap::kMaxStrips), | |
2aeec17d | 230 | fShapingTime(6) |
02a27b50 | 231 | { |
232 | // Default ctor - don't use it | |
233 | } | |
234 | ||
235 | //____________________________________________________________________ | |
236 | AliFMDBaseDigitizer::AliFMDBaseDigitizer(AliRunDigitizer* manager) | |
237 | : AliDigitizer(manager, "AliFMDBaseDigitizer", "FMD Digitizer base class"), | |
238 | fRunLoader(0), | |
239 | fEdep(AliFMDMap::kMaxDetectors, | |
240 | AliFMDMap::kMaxRings, | |
241 | AliFMDMap::kMaxSectors, | |
b5ee4425 | 242 | AliFMDMap::kMaxStrips), |
2aeec17d | 243 | fShapingTime(6) |
02a27b50 | 244 | { |
245 | // Normal CTOR | |
f95a63c4 | 246 | AliFMDDebug(1, (" processed")); |
02a27b50 | 247 | SetShapingTime(); |
248 | } | |
249 | ||
250 | //____________________________________________________________________ | |
251 | AliFMDBaseDigitizer::AliFMDBaseDigitizer(const Char_t* name, | |
252 | const Char_t* title) | |
253 | : AliDigitizer(name, title), | |
254 | fRunLoader(0), | |
255 | fEdep(AliFMDMap::kMaxDetectors, | |
256 | AliFMDMap::kMaxRings, | |
257 | AliFMDMap::kMaxSectors, | |
322be683 | 258 | AliFMDMap::kMaxStrips), |
259 | fShapingTime(6) | |
02a27b50 | 260 | { |
261 | // Normal CTOR | |
f95a63c4 | 262 | AliFMDDebug(1, (" processed")); |
02a27b50 | 263 | SetShapingTime(); |
264 | } | |
265 | ||
266 | //____________________________________________________________________ | |
267 | AliFMDBaseDigitizer::~AliFMDBaseDigitizer() | |
268 | { | |
269 | // Destructor | |
270 | } | |
271 | ||
272 | //____________________________________________________________________ | |
273 | Bool_t | |
274 | AliFMDBaseDigitizer::Init() | |
275 | { | |
276 | // Initialization | |
277 | AliFMDParameters::Instance()->Init(); | |
8b26caab | 278 | if (AliLog::GetDebugLevel("FMD","") >= 10) |
279 | AliFMDParameters::Instance()->Print("ALL"); | |
02a27b50 | 280 | return kTRUE; |
281 | } | |
282 | ||
283 | ||
284 | //____________________________________________________________________ | |
285 | UShort_t | |
286 | AliFMDBaseDigitizer::MakePedestal(UShort_t, | |
287 | Char_t, | |
288 | UShort_t, | |
289 | UShort_t) const | |
290 | { | |
291 | // Make a pedestal | |
292 | return 0; | |
293 | } | |
294 | ||
295 | //____________________________________________________________________ | |
296 | void | |
297 | AliFMDBaseDigitizer::SumContributions(AliFMD* fmd) | |
298 | { | |
299 | // Sum energy deposited contributions from each hit in a cache | |
300 | // (fEdep). | |
301 | if (!fRunLoader) | |
302 | Fatal("SumContributions", "no run loader"); | |
303 | ||
304 | // Clear array of deposited energies | |
305 | fEdep.Reset(); | |
306 | ||
307 | // Get the FMD loader | |
308 | AliLoader* inFMD = fRunLoader->GetLoader("FMDLoader"); | |
309 | // And load the hits | |
310 | inFMD->LoadHits("READ"); | |
311 | ||
312 | // Get the tree of hits | |
313 | TTree* hitsTree = inFMD->TreeH(); | |
314 | if (!hitsTree) { | |
315 | // Try again | |
316 | inFMD->LoadHits("READ"); | |
317 | hitsTree = inFMD->TreeH(); | |
318 | } | |
319 | ||
320 | // Get the FMD branch | |
321 | TBranch* hitsBranch = hitsTree->GetBranch("FMD"); | |
322 | if (hitsBranch) fmd->SetHitsAddressBranch(hitsBranch); | |
323 | else AliFatal("Branch FMD hit not found"); | |
324 | ||
325 | // Get a list of hits from the FMD manager | |
326 | TClonesArray *fmdHits = fmd->Hits(); | |
327 | ||
328 | // Get number of entries in the tree | |
329 | Int_t ntracks = Int_t(hitsTree->GetEntries()); | |
330 | ||
331 | AliFMDParameters* param = AliFMDParameters::Instance(); | |
332 | Int_t read = 0; | |
333 | // Loop over the tracks in the | |
334 | for (Int_t track = 0; track < ntracks; track++) { | |
335 | // Read in entry number `track' | |
336 | read += hitsBranch->GetEntry(track); | |
337 | ||
338 | // Get the number of hits | |
339 | Int_t nhits = fmdHits->GetEntries (); | |
340 | for (Int_t hit = 0; hit < nhits; hit++) { | |
341 | // Get the hit number `hit' | |
342 | AliFMDHit* fmdHit = | |
343 | static_cast<AliFMDHit*>(fmdHits->UncheckedAt(hit)); | |
344 | ||
345 | // Extract parameters | |
346 | UShort_t detector = fmdHit->Detector(); | |
347 | Char_t ring = fmdHit->Ring(); | |
348 | UShort_t sector = fmdHit->Sector(); | |
349 | UShort_t strip = fmdHit->Strip(); | |
350 | Float_t edep = fmdHit->Edep(); | |
15b17c89 | 351 | // UShort_t minstrip = param->GetMinStrip(detector, ring, sector, strip); |
352 | // UShort_t maxstrip = param->GetMaxStrip(detector, ring, sector, strip); | |
02a27b50 | 353 | // Check if strip is `dead' |
f95a63c4 | 354 | AliFMDDebug(2, ("Hit in FMD%d%c[%2d,%3d]=%f", |
355 | detector, ring, sector, strip, edep)); | |
02a27b50 | 356 | if (param->IsDead(detector, ring, sector, strip)) { |
f95a63c4 | 357 | AliFMDDebug(1, ("FMD%d%c[%2d,%3d] is marked as dead", |
02a27b50 | 358 | detector, ring, sector, strip)); |
359 | continue; | |
360 | } | |
361 | // Check if strip is out-side read-out range | |
15b17c89 | 362 | // if (strip < minstrip || strip > maxstrip) { |
f95a63c4 | 363 | // AliFMDDebug(5, ("FMD%d%c[%2d,%3d] is outside range [%3d,%3d]", |
15b17c89 | 364 | // detector,ring,sector,strip,minstrip,maxstrip)); |
365 | // continue; | |
366 | // } | |
02a27b50 | 367 | |
368 | // Give warning in case of double hit | |
369 | if (fEdep(detector, ring, sector, strip).fEdep != 0) | |
f95a63c4 | 370 | AliFMDDebug(5, ("Double hit in %d%c(%d,%d)", |
02a27b50 | 371 | detector, ring, sector, strip)); |
372 | ||
373 | // Sum energy deposition | |
374 | fEdep(detector, ring, sector, strip).fEdep += edep; | |
375 | fEdep(detector, ring, sector, strip).fN += 1; | |
376 | // Add this to the energy deposited for this strip | |
377 | } // hit loop | |
378 | } // track loop | |
f95a63c4 | 379 | AliFMDDebug(1, ("Size of cache: %d bytes, read %d bytes", |
02a27b50 | 380 | sizeof(fEdep), read)); |
381 | } | |
382 | ||
383 | //____________________________________________________________________ | |
384 | void | |
385 | AliFMDBaseDigitizer::DigitizeHits(AliFMD* fmd) const | |
386 | { | |
387 | // For the stored energy contributions in the cache (fEdep), convert | |
388 | // the energy signal to ADC counts, and store the created digit in | |
389 | // the digits array (AliFMD::fDigits) | |
390 | // | |
391 | AliFMDGeometry* geometry = AliFMDGeometry::Instance(); | |
392 | ||
2aeec17d | 393 | TArrayI counts(4); |
02a27b50 | 394 | for (UShort_t detector=1; detector <= 3; detector++) { |
f95a63c4 | 395 | AliFMDDebug(5, ("Processing hits in FMD%d", detector)); |
02a27b50 | 396 | // Get pointer to subdetector |
397 | AliFMDDetector* det = geometry->GetDetector(detector); | |
398 | if (!det) continue; | |
399 | for (UShort_t ringi = 0; ringi <= 1; ringi++) { | |
400 | Char_t ring = ringi == 0 ? 'I' : 'O'; | |
f95a63c4 | 401 | AliFMDDebug(5, (" Processing hits in FMD%d%c", detector,ring)); |
02a27b50 | 402 | // Get pointer to Ring |
403 | AliFMDRing* r = det->GetRing(ring); | |
404 | if (!r) continue; | |
405 | ||
406 | // Get number of sectors | |
407 | UShort_t nSectors = UShort_t(360. / r->GetTheta()); | |
408 | // Loop over the number of sectors | |
409 | for (UShort_t sector = 0; sector < nSectors; sector++) { | |
f95a63c4 | 410 | AliFMDDebug(5, (" Processing hits in FMD%d%c[%2d]", |
411 | detector,ring,sector)); | |
02a27b50 | 412 | // Get number of strips |
413 | UShort_t nStrips = r->GetNStrips(); | |
414 | // Loop over the stips | |
415 | Float_t last = 0; | |
416 | for (UShort_t strip = 0; strip < nStrips; strip++) { | |
417 | // Reset the counter array to the invalid value -1 | |
418 | counts.Reset(-1); | |
419 | // Reset the last `ADC' value when we've get to the end of a | |
420 | // VA1_ALICE channel. | |
421 | if (strip % 128 == 0) last = 0; | |
422 | ||
423 | Float_t edep = fEdep(detector, ring, sector, strip).fEdep; | |
424 | ConvertToCount(edep, last, detector, ring, sector, strip, counts); | |
425 | last = edep; | |
8b26caab | 426 | |
427 | // The following line was introduced - wrongly - by Peter | |
428 | // Hristov. It _will_ break the digitisation and the | |
429 | // following reconstruction. The behviour of the | |
430 | // digitisation models exactly the front-end as it should | |
431 | // (no matter what memory concuption it may entail). The | |
432 | // check should be on zero suppression, since that's what | |
433 | // models the front-end - if zero suppression is turned on | |
434 | // in the front-end, then we can suppress empty digits - | |
435 | // otherwise we shoud never do that. Note, that the line | |
436 | // affects _both_ normal digitisation and digitisation for | |
437 | // summable digits, since the condition is on the energy | |
438 | // deposition and not on the actual number of counts. If | |
439 | // this line should go anywhere, it should be in the | |
440 | // possible overloaded AliFMDSDigitizer::AddDigit - not | |
441 | // here. | |
442 | // | |
443 | // if (edep<=0) continue; | |
02a27b50 | 444 | AddDigit(fmd, detector, ring, sector, strip, edep, |
445 | UShort_t(counts[0]), Short_t(counts[1]), | |
2aeec17d | 446 | Short_t(counts[2]), Short_t(counts[3])); |
f95a63c4 | 447 | AliFMDDebug(10, (" Adding digit in FMD%d%c[%2d,%3d]=%d", |
448 | detector,ring,sector,strip,counts[0])); | |
02a27b50 | 449 | #if 0 |
450 | // This checks if the digit created will give the `right' | |
451 | // number of particles when reconstructed, using a naiive | |
452 | // approach. It's here only as a quality check - nothing | |
453 | // else. | |
454 | CheckDigit(digit, fEdep(detector, ring, sector, strip).fN, | |
455 | counts); | |
456 | #endif | |
457 | } // Strip | |
458 | } // Sector | |
459 | } // Ring | |
460 | } // Detector | |
461 | } | |
462 | ||
463 | //____________________________________________________________________ | |
464 | void | |
465 | AliFMDBaseDigitizer::ConvertToCount(Float_t edep, | |
466 | Float_t last, | |
467 | UShort_t detector, | |
468 | Char_t ring, | |
469 | UShort_t sector, | |
470 | UShort_t strip, | |
471 | TArrayI& counts) const | |
472 | { | |
473 | // Convert the total energy deposited to a (set of) ADC count(s). | |
474 | // | |
475 | // This is done by | |
476 | // | |
477 | // Energy_Deposited ALTRO_Channel_Size | |
478 | // ADC = -------------------------- ------------------- + pedestal | |
479 | // Energy_Deposition_Of_1_MIP VA1_ALICE_MIP_Range | |
480 | // | |
481 | // Energy_Deposited fAltroChannelSize | |
482 | // = --------------------------------- ----------------- + pedestal | |
483 | // 1.664 * Si_Thickness * Si_Density fVA1MipRange | |
484 | // | |
485 | // | |
486 | // = Energy_Deposited * ConversionFactor + pedestal | |
487 | // | |
488 | // However, this is modified by the response function of the | |
489 | // VA1_ALICE pre-amp. chip in case we are doing oversampling of the | |
490 | // VA1_ALICE output. | |
491 | // | |
492 | // In that case, we get N=fSampleRate values of the ADC, and the | |
493 | // `EnergyDeposited' is a function of which sample where are | |
494 | // calculating the ADC for | |
495 | // | |
496 | // ADC_i = f(EnergyDeposited, i/N, Last) * ConversionFactor + pedestal | |
497 | // | |
498 | // where Last is the Energy deposited in the previous strip. | |
499 | // | |
500 | // Here, f is the shaping function of the VA1_ALICE. This is given | |
501 | // by | |
502 | // | |
503 | // | (E - l) * (1 - exp(-B * t) + l if E > l | |
504 | // f(E, t, l) = < | |
505 | // | (l - E) * exp(-B * t) + E otherwise | |
506 | // | |
507 | // | |
508 | // = E + (l - E) * ext(-B * t) | |
509 | // | |
510 | AliFMDParameters* param = AliFMDParameters::Instance(); | |
a9579262 | 511 | Float_t convF = 1./param->GetPulseGain(detector,ring,sector,strip); |
512 | Int_t ped = MakePedestal(detector,ring,sector,strip); | |
513 | Int_t maxAdc = param->GetAltroChannelSize()-1; | |
514 | if (maxAdc < 0) { | |
515 | AliWarning(Form("Maximum ADC is %d < 0, forcing it to 1023", maxAdc)); | |
516 | maxAdc = 1023; | |
517 | } | |
02a27b50 | 518 | UShort_t rate = param->GetSampleRate(detector,ring,sector,strip); |
2aeec17d | 519 | if (rate < 1 || rate > 4) rate = 1; |
02a27b50 | 520 | |
521 | // In case we don't oversample, just return the end value. | |
522 | if (rate == 1) { | |
a9579262 | 523 | Float_t a = edep * convF + ped; |
524 | if (a < 0) a = 0; | |
525 | counts[0] = UShort_t(TMath::Min(a, Float_t(maxAdc))); | |
f95a63c4 | 526 | AliFMDDebug(2, ("FMD%d%c[%2d,%3d]: converting ELoss %f to " |
a9579262 | 527 | "ADC %4d (%f,%d)", |
528 | detector,ring,sector,strip,edep,counts[0],convF,ped)); | |
02a27b50 | 529 | return; |
530 | } | |
531 | ||
532 | // Create a pedestal | |
533 | Float_t b = fShapingTime; | |
534 | for (Ssiz_t i = 0; i < rate; i++) { | |
2aeec17d | 535 | Float_t t = Float_t(i) / rate + 1./rate; |
a9579262 | 536 | Float_t s = edep + (last - edep) * TMath::Exp(-b * t); |
537 | Float_t a = Int_t(s * convF + ped); | |
538 | if (a < 0) a = 0; | |
539 | counts[i] = UShort_t(TMath::Min(a, Float_t(maxAdc))); | |
02a27b50 | 540 | } |
541 | } | |
542 | ||
543 | ||
544 | ||
545 | //____________________________________________________________________ | |
546 | // | |
547 | // EOF | |
548 | // | |
549 | ||
550 | ||
551 | ||
552 |