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[u/mrichter/AliRoot.git] / FMD / AliFMDReconstructor.cxx
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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/* $Id$ */
16/** @file AliFMDReconstructor.cxx
17 @author Christian Holm Christensen <cholm@nbi.dk>
18 @date Mon Mar 27 12:47:09 2006
19 @brief FMD reconstruction
20*/
21//____________________________________________________________________
22//
23// This is a class that constructs AliFMDRecPoint objects from of Digits
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). The rec-points are made via the naiive
27// method.
28//
29//-- Authors: Evgeny Karpechev(INR) and Alla Maevsksia
30// Latest changes by Christian Holm Christensen <cholm@nbi.dk>
31//
32//
33//____________________________________________________________________
34
35#include <AliLog.h> // ALILOG_H
36// #include <AliRun.h> // ALIRUN_H
37#include <AliRunLoader.h> // ALIRUNLOADER_H
38#include <AliHeader.h> // ALIHEADER_H
39#include <AliGenEventHeader.h> // ALIGENEVENTHEADER_H
40#include "AliFMDGeometry.h" // ALIFMDGEOMETRY_H
41#include "AliFMDParameters.h" // ALIFMDPARAMETERS_H
42#include "AliFMDDigit.h" // ALIFMDDIGIT_H
43#include "AliFMDReconstructor.h" // ALIFMDRECONSTRUCTOR_H
44#include "AliFMDRawReader.h" // ALIFMDRAWREADER_H
45#include "AliFMDRecPoint.h" // ALIFMDMULTNAIIVE_H
46#include "AliESD.h" // ALIESD_H
47#include <AliESDFMD.h> // ALIESDFMD_H
48class AliRawReader;
49
50//____________________________________________________________________
51ClassImp(AliFMDReconstructor)
52#if 0
53 ; // This is here to keep Emacs for indenting the next line
54#endif
55
56//____________________________________________________________________
57AliFMDReconstructor::AliFMDReconstructor()
58 : AliReconstructor(),
59 fMult(0x0),
60 fNMult(0),
61 fTreeR(0x0),
62 fCurrentVertex(0),
63 fESDObj(0x0),
64 fESD(0x0)
65{
66 // Make a new FMD reconstructor object - default CTOR.
67 SetNoiseFactor();
68 SetAngleCorrect();
69}
70
71
72//____________________________________________________________________
73AliFMDReconstructor::AliFMDReconstructor(const AliFMDReconstructor& other)
74 : AliReconstructor(),
75 fMult(other.fMult),
76 fNMult(other.fNMult),
77 fTreeR(other.fTreeR),
78 fCurrentVertex(other.fCurrentVertex),
79 fESDObj(other.fESDObj),
80 fESD(other.fESD),
81 fNoiseFactor(other.fNoiseFactor),
82 fAngleCorrect(other.fAngleCorrect)
83{
84 // Copy constructor
85}
86
87
88//____________________________________________________________________
89AliFMDReconstructor&
90AliFMDReconstructor::operator=(const AliFMDReconstructor& other)
91{
92 // Assignment operator
93 fMult = other.fMult;
94 fNMult = other.fNMult;
95 fTreeR = other.fTreeR;
96 fCurrentVertex = other.fCurrentVertex;
97 fESDObj = other.fESDObj;
98 fESD = other.fESD;
99 fNoiseFactor = other.fNoiseFactor;
100 fAngleCorrect = other.fAngleCorrect;
101
102 return *this;
103}
104
105//____________________________________________________________________
106AliFMDReconstructor::~AliFMDReconstructor()
107{
108 // Destructor
109 if (fMult) fMult->Delete();
110 if (fMult) delete fMult;
111 if (fESDObj) delete fESDObj;
112}
113
114//____________________________________________________________________
115void
116AliFMDReconstructor::Init(AliRunLoader* runLoader)
117{
118 // Initialize the reconstructor
119 AliDebug(1, Form("Init called with runloader 0x%x", runLoader));
120 // Initialize the geometry
121 AliFMDGeometry* geom = AliFMDGeometry::Instance();
122 geom->Init();
123 geom->InitTransformations();
124
125 // Initialize the parameters
126 AliFMDParameters* param = AliFMDParameters::Instance();
127 param->Init();
128
129 // Current vertex position
130 fCurrentVertex = 0;
131 // Create array of reconstructed strip multiplicities
132 fMult = new TClonesArray("AliFMDRecPoint", 51200);
133 // Create ESD output object
134 fESDObj = new AliESDFMD;
135
136 // Check that we have a run loader
137 if (!runLoader) {
138 Warning("Init", "No run loader");
139 return;
140 }
141
142 // Check if we can get the header tree
143 AliHeader* header = runLoader->GetHeader();
144 if (!header) {
145 Warning("Init", "No header");
146 return;
147 }
148
149 // Check if we can get a simulation header
150 AliGenEventHeader* eventHeader = header->GenEventHeader();
151 if (eventHeader) {
152 TArrayF vtx;
153 eventHeader->PrimaryVertex(vtx);
154 fCurrentVertex = vtx[2];
155 AliDebug(1, Form("Primary vertex Z coordinate for event # %d/%d is %f",
156 header->GetRun(), header->GetEvent(), fCurrentVertex));
157 Warning("Init", "no generator event header");
158 }
159 else {
160 Warning("Init", "No generator event header - "
161 "perhaps we get the vertex from ESD?");
162 }
163}
164
165//____________________________________________________________________
166void
167AliFMDReconstructor::ConvertDigits(AliRawReader* reader,
168 TTree* digitsTree) const
169{
170 // Convert Raw digits to AliFMDDigit's in a tree
171 AliDebug(1, "Reading raw data into digits tree");
172 AliFMDRawReader rawRead(reader, digitsTree);
173 // rawRead.SetSampleRate(fFMD->GetSampleRate());
174 rawRead.Exec();
175}
176
177//____________________________________________________________________
178void
179AliFMDReconstructor::Reconstruct(TTree* digitsTree,
180 TTree* clusterTree) const
181{
182 // Reconstruct event from digits in tree
183 // Get the FMD branch holding the digits.
184 // FIXME: The vertex may not be known yet, so we may have to move
185 // some of this to FillESD.
186 AliDebug(1, "Reconstructing from digits in a tree");
187#if 1
188 if (fESD) {
189 const AliESDVertex* vertex = fESD->GetVertex();
190 if (vertex) {
191 AliDebug(1, Form("Got vertex from ESD: %f", vertex->GetZv()));
192 fCurrentVertex = vertex->GetZv();
193 }
194 }
195#endif
196 TBranch *digitBranch = digitsTree->GetBranch("FMD");
197 if (!digitBranch) {
198 Error("Exec", "No digit branch for the FMD found");
199 return;
200 }
201 TClonesArray* digits = new TClonesArray("AliFMDDigit");
202 digitBranch->SetAddress(&digits);
203
204 if (fMult) fMult->Clear();
205 if (fESDObj) fESDObj->Clear();
206
207 fNMult = 0;
208 fTreeR = clusterTree;
209 fTreeR->Branch("FMD", &fMult);
210
211 AliDebug(5, "Getting entry 0 from digit branch");
212 digitBranch->GetEntry(0);
213
214 AliDebug(5, "Processing digits");
215 ProcessDigits(digits);
216
217 Int_t written = clusterTree->Fill();
218 AliDebug(10, Form("Filled %d bytes into cluster tree", written));
219 digits->Delete();
220 delete digits;
221}
222
223
224//____________________________________________________________________
225void
226AliFMDReconstructor::ProcessDigits(TClonesArray* digits) const
227{
228 // For each digit, find the pseudo rapdity, azimuthal angle, and
229 // number of corrected ADC counts, and pass it on to the algorithms
230 // used.
231 Int_t nDigits = digits->GetEntries();
232 AliDebug(1, Form("Got %d digits", nDigits));
233 fESDObj->SetNoiseFactor(fNoiseFactor);
234 fESDObj->SetAngleCorrected(fAngleCorrect);
235 for (Int_t i = 0; i < nDigits; i++) {
236 AliFMDDigit* digit = static_cast<AliFMDDigit*>(digits->At(i));
237 AliFMDParameters* param = AliFMDParameters::Instance();
238 // Check that the strip is not marked as dead
239 if (param->IsDead(digit->Detector(), digit->Ring(),
240 digit->Sector(), digit->Strip())) {
241 AliDebug(10, Form("FMD%d%c[%2d,%3d] is dead", digit->Detector(),
242 digit->Ring(), digit->Sector(), digit->Strip()));
243 continue;
244 }
245
246 // digit->Print();
247 // Get eta and phi
248 Float_t eta, phi;
249 PhysicalCoordinates(digit, eta, phi);
250
251 // Substract pedestal.
252 UShort_t counts = SubtractPedestal(digit);
253
254 // Gain match digits.
255 Double_t edep = Adc2Energy(digit, eta, counts);
256
257 // Make rough multiplicity
258 Double_t mult = Energy2Multiplicity(digit, edep);
259
260 AliDebug(10, Form("FMD%d%c[%2d,%3d]: "
261 "ADC: %d, Counts: %d, Energy: %f, Mult: %f",
262 digit->Detector(), digit->Ring(), digit->Sector(),
263 digit->Strip(), digit->Counts(), counts, edep, mult));
264
265 // Create a `RecPoint' on the output branch.
266 AliFMDRecPoint* m =
267 new ((*fMult)[fNMult]) AliFMDRecPoint(digit->Detector(),
268 digit->Ring(),
269 digit->Sector(),
270 digit->Strip(),
271 eta, phi,
272 edep, mult);
273 (void)m; // Suppress warnings about unused variables.
274 fNMult++;
275
276 fESDObj->SetMultiplicity(digit->Detector(), digit->Ring(),
277 digit->Sector(), digit->Strip(), mult);
278 fESDObj->SetEta(digit->Detector(), digit->Ring(),
279 digit->Sector(), digit->Strip(), eta);
280 }
281}
282
283//____________________________________________________________________
284UShort_t
285AliFMDReconstructor::SubtractPedestal(AliFMDDigit* digit) const
286{
287 // Member function to subtract the pedestal from a digit
288 // This implementation does nothing, but a derived class could over
289 // load this to subtract a pedestal that was given in a database or
290 // something like that.
291
292 Int_t counts = 0;
293 AliFMDParameters* param = AliFMDParameters::Instance();
294 Float_t ped = param->GetPedestal(digit->Detector(),
295 digit->Ring(),
296 digit->Sector(),
297 digit->Strip());
298 Float_t noise = param->GetPedestalWidth(digit->Detector(),
299 digit->Ring(),
300 digit->Sector(),
301 digit->Strip());
302 AliDebug(15, Form("Subtracting pedestal %f from signal %d",
303 ped, digit->Counts()));
304 if (digit->Count3() > 0) counts = digit->Count3();
305 else if (digit->Count2() > 0) counts = digit->Count2();
306 else counts = digit->Count1();
307 counts = TMath::Max(Int_t(counts - ped), 0);
308 if (counts < noise * fNoiseFactor) counts = 0;
309 if (counts > 0) AliDebug(15, "Got a hit strip");
310
311 return UShort_t(counts);
312}
313
314//____________________________________________________________________
315Float_t
316AliFMDReconstructor::Adc2Energy(AliFMDDigit* digit,
317 Float_t eta,
318 UShort_t count) const
319{
320 // Converts number of ADC counts to energy deposited.
321 // Note, that this member function can be overloaded by derived
322 // classes to do strip-specific look-ups in databases or the like,
323 // to find the proper gain for a strip.
324 //
325 // In this simple version, we calculate the energy deposited as
326 //
327 // EnergyDeposited = cos(theta) * gain * count
328 //
329 // where
330 //
331 // Pre_amp_MIP_Range
332 // gain = ----------------- * Energy_deposited_per_MIP
333 // ADC_channel_size
334 //
335 // is constant and the same for all strips.
336
337 if (count <= 0) return 0;
338 AliFMDParameters* param = AliFMDParameters::Instance();
339 Float_t gain = param->GetPulseGain(digit->Detector(),
340 digit->Ring(),
341 digit->Sector(),
342 digit->Strip());
343 AliDebug(15, Form("Converting counts %d to energy via factor %f",
344 count, gain));
345
346 Double_t edep = count * gain;
347 if (fAngleCorrect) {
348 Double_t theta = 2 * TMath::ATan(TMath::Exp(-eta));
349 edep *= TMath::Abs(TMath::Cos(theta));
350 }
351 return edep;
352}
353
354//____________________________________________________________________
355Float_t
356AliFMDReconstructor::Energy2Multiplicity(AliFMDDigit* /* digit */,
357 Float_t edep) const
358{
359 // Converts an energy signal to number of particles.
360 // Note, that this member function can be overloaded by derived
361 // classes to do strip-specific look-ups in databases or the like,
362 // to find the proper gain for a strip.
363 //
364 // In this simple version, we calculate the multiplicity as
365 //
366 // multiplicity = Energy_deposited / Energy_deposited_per_MIP
367 //
368 // where
369 //
370 // Energy_deposited_per_MIP = 1.664 * SI_density * SI_thickness
371 //
372 // is constant and the same for all strips
373 AliFMDParameters* param = AliFMDParameters::Instance();
374 Double_t edepMIP = param->GetEdepMip();
375 Float_t mult = edep / edepMIP;
376 if (edep > 0)
377 AliDebug(15, Form("Translating energy %f to multiplicity via "
378 "divider %f->%f", edep, edepMIP, mult));
379 return mult;
380}
381
382//____________________________________________________________________
383void
384AliFMDReconstructor::PhysicalCoordinates(AliFMDDigit* digit,
385 Float_t& eta,
386 Float_t& phi) const
387{
388 // Get the eta and phi of a digit
389 //
390 // Get geometry.
391 AliFMDGeometry* geom = AliFMDGeometry::Instance();
392 Double_t x, y, z, r, theta;
393 geom->Detector2XYZ(digit->Detector(), digit->Ring(), digit->Sector(),
394 digit->Strip(), x, y, z);
395 // Correct for vertex offset.
396 z += fCurrentVertex;
397 phi = TMath::ATan2(y, x);
398 r = TMath::Sqrt(y * y + x * x);
399 theta = TMath::ATan2(r, z);
400 eta = -TMath::Log(TMath::Tan(theta / 2));
401}
402
403
404
405//____________________________________________________________________
406void
407AliFMDReconstructor::FillESD(TTree* /* digitsTree */,
408 TTree* /* clusterTree */,
409 AliESD* esd) const
410{
411 // nothing to be done
412 // FIXME: The vertex may not be known when Reconstruct is executed,
413 // so we may have to move some of that member function here.
414 AliDebug(1, Form("Calling FillESD with two trees and one ESD"));
415 // fESDObj->Print();
416
417 if (esd) {
418 AliDebug(1, Form("Writing FMD data to ESD tree"));
419 esd->SetFMDData(fESDObj);
420 }
421}
422
423
424//____________________________________________________________________
425void
426AliFMDReconstructor::Reconstruct(AliRawReader*,TTree*) const
427{
428 // Cannot be used. See member function with same name but with 2
429 // TTree arguments. Make sure you do local reconstrucion
430 AliDebug(1, Form("Calling FillESD with loader and tree"));
431 AliError("MayNotUse");
432}
433//____________________________________________________________________
434void
435AliFMDReconstructor::Reconstruct(AliRunLoader*) const
436{
437 // Cannot be used. See member function with same name but with 2
438 // TTree arguments. Make sure you do local reconstrucion
439 AliDebug(1, Form("Calling FillESD with loader"));
440 AliError("MayNotUse");
441}
442//____________________________________________________________________
443void
444AliFMDReconstructor::Reconstruct(AliRunLoader*, AliRawReader*) const
445{
446 // Cannot be used. See member function with same name but with 2
447 // TTree arguments. Make sure you do local reconstrucion
448 AliDebug(1, Form("Calling FillESD with loader and raw reader"));
449 AliError("MayNotUse");
450}
451//____________________________________________________________________
452void
453AliFMDReconstructor::FillESD(AliRawReader*,TTree*,AliESD*) const
454{
455 // Cannot be used. See member function with same name but with 2
456 // TTree arguments. Make sure you do local reconstrucion
457 AliDebug(1, Form("Calling FillESD with raw reader, tree, and ESD"));
458 AliError("MayNotUse");
459}
460//____________________________________________________________________
461void
462AliFMDReconstructor::FillESD(AliRunLoader*,AliESD*) const
463{
464 // Cannot be used. See member function with same name but with 2
465 // TTree arguments. Make sure you do local reconstrucion
466 AliDebug(1, Form("Calling FillESD with loader and ESD"));
467 AliError("MayNotUse");
468}
469//____________________________________________________________________
470void
471AliFMDReconstructor::FillESD(AliRunLoader*,AliRawReader*,AliESD*) const
472{
473 // Cannot be used. See member function with same name but with 2
474 // TTree arguments. Make sure you do local reconstrucion
475 AliDebug(1, Form("Calling FillESD with loader, raw reader, and ESD"));
476 AliError("MayNotUse");
477}
478
479//____________________________________________________________________
480//
481// EOF
482//