Additiona TOF data members (S.Arcelli)
[u/mrichter/AliRoot.git] / FMD / AliFMDReconstructor.cxx
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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//
7684b53c 20// This is a class that constructs AliFMDMult (reconstructed
21// multiplicity) from of Digits
4347b38f 22//
23// This class reads either digits from a TClonesArray or raw data from
24// a DDL file (or similar), and stores the read ADC counts in an
25// internal cache (fAdcs).
26//
37c55dc0 27//-- Authors: Evgeny Karpechev(INR) and Alla Maevsksia
4347b38f 28// Latest changes by Christian Holm Christensen <cholm@nbi.dk>
29//
30//
31//____________________________________________________________________
37c55dc0 32
56b1929b 33#include <AliLog.h> // ALILOG_H
34#include <AliRun.h> // ALIRUN_H
35#include <AliRunLoader.h> // ALIRUNLOADER_H
36#include <AliLoader.h> // ALILOADER_H
37#include <AliHeader.h> // ALIHEADER_H
38#include <AliRawReader.h> // ALIRAWREADER_H
39#include <AliGenEventHeader.h> // ALIGENEVENTHEADER_H
1a1fdef7 40#include "AliFMD.h" // ALIFMD_H
41#include "AliFMDGeometry.h" // ALIFMDGEOMETRY_H
42#include "AliFMDParameters.h" // ALIFMDPARAMETERS_H
43#include "AliFMDDetector.h" // ALIFMDDETECTOR_H
44#include "AliFMDRing.h" // ALIFMDRING_H
56b1929b 45#include "AliFMDDigit.h" // ALIFMDDIGIT_H
46#include "AliFMDReconstructor.h" // ALIFMDRECONSTRUCTOR_H
47#include "AliFMDRawStream.h" // ALIFMDRAWSTREAM_H
48#include "AliFMDRawReader.h" // ALIFMDRAWREADER_H
bf000c32 49#include "AliFMDRecPoint.h" // ALIFMDMULTNAIIVE_H
a3537838 50#include "AliESD.h" // ALIESD_H
8f6ee336 51#include <AliESDFMD.h> // ALIESDFMD_H
52#include <TFile.h>
4347b38f 53
54//____________________________________________________________________
925e6570 55ClassImp(AliFMDReconstructor)
1a1fdef7 56#if 0
57 ; // This is here to keep Emacs for indenting the next line
58#endif
37c55dc0 59
4347b38f 60//____________________________________________________________________
61AliFMDReconstructor::AliFMDReconstructor()
62 : AliReconstructor(),
e9fd1e20 63 fMult(0x0),
64 fNMult(0),
65 fTreeR(0x0),
66 fCurrentVertex(0),
67 fESDObj(0x0),
68 fESD(0x0)
4347b38f 69{
8f6ee336 70 // Make a new FMD reconstructor object - default CTOR.
4347b38f 71}
72
42403906 73
74//____________________________________________________________________
75AliFMDReconstructor::AliFMDReconstructor(const AliFMDReconstructor& other)
8f6ee336 76 : AliReconstructor(),
77 fMult(other.fMult),
e9fd1e20 78 fNMult(other.fNMult),
79 fTreeR(other.fTreeR),
80 fCurrentVertex(other.fCurrentVertex),
81 fESDObj(other.fESDObj),
82 fESD(other.fESD)
42403906 83{
56b1929b 84 // Copy constructor
42403906 85}
86
87
88//____________________________________________________________________
89AliFMDReconstructor&
90AliFMDReconstructor::operator=(const AliFMDReconstructor& other)
91{
56b1929b 92 // Assignment operator
8f6ee336 93 fMult = other.fMult;
e9fd1e20 94 fNMult = other.fNMult;
95 fTreeR = other.fTreeR;
96 fCurrentVertex = other.fCurrentVertex;
8f6ee336 97 fESDObj = other.fESDObj;
e9fd1e20 98 fESD = other.fESD;
42403906 99 return *this;
100}
56b1929b 101
102//____________________________________________________________________
103AliFMDReconstructor::~AliFMDReconstructor()
104{
105 // Destructor
8f6ee336 106 if (fMult) fMult->Delete();
107 if (fMult) delete fMult;
108 if (fESDObj) delete fESDObj;
56b1929b 109}
4347b38f 110
111//____________________________________________________________________
112void
1a1fdef7 113AliFMDReconstructor::Init(AliRunLoader* runLoader)
114{
115 // Initialize the reconstructor
116 AliDebug(1, Form("Init called with runloader 0x%x", runLoader));
bf000c32 117 // Initialize the geometry
9b48326f 118 AliFMDGeometry* geom = AliFMDGeometry::Instance();
119 geom->Init();
120 geom->InitTransformations();
121
122 // Initialize the parameters
123 AliFMDParameters* param = AliFMDParameters::Instance();
124 param->Init();
bf000c32 125
8f6ee336 126 // Current vertex position
1a1fdef7 127 fCurrentVertex = 0;
8f6ee336 128 // Create array of reconstructed strip multiplicities
bf000c32 129 fMult = new TClonesArray("AliFMDRecPoint", 51200);
8f6ee336 130 // Create ESD output object
131 fESDObj = new AliESDFMD;
132
133 // Check that we have a run loader
1a1fdef7 134 if (!runLoader) {
135 Warning("Init", "No run loader");
4347b38f 136 return;
137 }
8f6ee336 138
139 // Check if we can get the header tree
1a1fdef7 140 AliHeader* header = runLoader->GetHeader();
141 if (!header) {
142 Warning("Init", "No header");
4347b38f 143 return;
144 }
8f6ee336 145
146 // Check if we can get a simulation header
1a1fdef7 147 AliGenEventHeader* eventHeader = header->GenEventHeader();
a3537838 148 if (eventHeader) {
149 TArrayF vtx;
150 eventHeader->PrimaryVertex(vtx);
151 fCurrentVertex = vtx[2];
152 AliDebug(1, Form("Primary vertex Z coordinate for event # %d/%d is %f",
153 header->GetRun(), header->GetEvent(), fCurrentVertex));
154 Warning("Init", "no generator event header");
155 }
156 else {
157 Warning("Init", "No generator event header - "
158 "perhaps we get the vertex from ESD?");
4347b38f 159 }
4347b38f 160}
dc8af42e 161
4347b38f 162//____________________________________________________________________
163void
1a1fdef7 164AliFMDReconstructor::ConvertDigits(AliRawReader* reader,
165 TTree* digitsTree) const
166{
167 // Convert Raw digits to AliFMDDigit's in a tree
8f6ee336 168 AliDebug(1, "Reading raw data into digits tree");
1a1fdef7 169 AliFMDRawReader rawRead(reader, digitsTree);
170 // rawRead.SetSampleRate(fFMD->GetSampleRate());
171 rawRead.Exec();
4347b38f 172}
173
4347b38f 174//____________________________________________________________________
175void
1a1fdef7 176AliFMDReconstructor::Reconstruct(TTree* digitsTree,
177 TTree* clusterTree) const
4347b38f 178{
1a1fdef7 179 // Reconstruct event from digits in tree
4347b38f 180 // Get the FMD branch holding the digits.
69b696b9 181 // FIXME: The vertex may not be known yet, so we may have to move
182 // some of this to FillESD.
1a1fdef7 183 AliDebug(1, "Reconstructing from digits in a tree");
1e8f773e 184#if 1
a3537838 185 if (fESD) {
8f6ee336 186 const AliESDVertex* vertex = fESD->GetVertex();
187 if (vertex) {
188 AliDebug(1, Form("Got vertex from ESD: %f", vertex->GetZv()));
189 fCurrentVertex = vertex->GetZv();
190 }
a3537838 191 }
54e415a8 192#endif
1a1fdef7 193 TBranch *digitBranch = digitsTree->GetBranch("FMD");
4347b38f 194 if (!digitBranch) {
1a1fdef7 195 Error("Exec", "No digit branch for the FMD found");
196 return;
4347b38f 197 }
0abe7182 198 TClonesArray* digits = new TClonesArray("AliFMDDigit");
1a1fdef7 199 digitBranch->SetAddress(&digits);
4347b38f 200
8f6ee336 201 if (fMult) fMult->Clear();
202 if (fESDObj) fESDObj->Clear();
203
204 fNMult = 0;
205 fTreeR = clusterTree;
206 fTreeR->Branch("FMD", &fMult);
207
208 AliDebug(5, "Getting entry 0 from digit branch");
1a1fdef7 209 digitBranch->GetEntry(0);
210
8f6ee336 211 AliDebug(5, "Processing digits");
e802be3e 212 ProcessDigits(digits);
213
8f6ee336 214 Int_t written = clusterTree->Fill();
215 AliDebug(10, Form("Filled %d bytes into cluster tree", written));
0abe7182 216 digits->Delete();
217 delete digits;
4347b38f 218}
1a1fdef7 219
8f6ee336 220
4347b38f 221//____________________________________________________________________
e802be3e 222void
223AliFMDReconstructor::ProcessDigits(TClonesArray* digits) const
4347b38f 224{
69b696b9 225 // For each digit, find the pseudo rapdity, azimuthal angle, and
226 // number of corrected ADC counts, and pass it on to the algorithms
227 // used.
e802be3e 228 Int_t nDigits = digits->GetEntries();
1a1fdef7 229 AliDebug(1, Form("Got %d digits", nDigits));
e802be3e 230 for (Int_t i = 0; i < nDigits; i++) {
231 AliFMDDigit* digit = static_cast<AliFMDDigit*>(digits->At(i));
8f6ee336 232 AliFMDParameters* param = AliFMDParameters::Instance();
233 // Check that the strip is not marked as dead
234 if (param->IsDead(digit->Detector(), digit->Ring(),
235 digit->Sector(), digit->Strip())) continue;
236
237 // digit->Print();
238 // Get eta and phi
239 Float_t eta, phi;
240 PhysicalCoordinates(digit, eta, phi);
4347b38f 241
8f6ee336 242 // Substract pedestal.
e802be3e 243 UShort_t counts = SubtractPedestal(digit);
4347b38f 244
8f6ee336 245 // Gain match digits.
246 Double_t edep = Adc2Energy(digit, eta, counts);
247
248 // Make rough multiplicity
249 Double_t mult = Energy2Multiplicity(digit, edep);
250
251 AliDebug(10, Form("FMD%d%c[%2d,%3d]: "
252 "ADC: %d, Counts: %d, Energy: %f, Mult: %f",
253 digit->Detector(), digit->Ring(), digit->Sector(),
254 digit->Strip(), digit->Counts(), counts, edep, mult));
255
256 // Create a `RecPoint' on the output branch.
bf000c32 257 AliFMDRecPoint* m =
258 new ((*fMult)[fNMult]) AliFMDRecPoint(digit->Detector(),
259 digit->Ring(),
260 digit->Sector(),
261 digit->Strip(),
262 eta, phi,
263 edep, mult);
8f6ee336 264 (void)m; // Suppress warnings about unused variables.
265 fNMult++;
266
267 fESDObj->SetMultiplicity(digit->Detector(), digit->Ring(),
268 digit->Sector(), digit->Strip(), mult);
269 fESDObj->SetEta(digit->Detector(), digit->Ring(),
270 digit->Sector(), digit->Strip(), eta);
4347b38f 271 }
4347b38f 272}
8f6ee336 273
1a1fdef7 274//____________________________________________________________________
275UShort_t
276AliFMDReconstructor::SubtractPedestal(AliFMDDigit* digit) const
277{
278 // Member function to subtract the pedestal from a digit
279 // This implementation does nothing, but a derived class could over
280 // load this to subtract a pedestal that was given in a database or
281 // something like that.
282
8f6ee336 283 Int_t counts = 0;
284 AliFMDParameters* param = AliFMDParameters::Instance();
285 Float_t pedM = param->GetPedestal(digit->Detector(),
286 digit->Ring(),
287 digit->Sector(),
288 digit->Strip());
289 AliDebug(10, Form("Subtracting pedestal %f from signal %d",
290 pedM, digit->Counts()));
1a1fdef7 291 if (digit->Count3() > 0) counts = digit->Count3();
292 else if (digit->Count2() > 0) counts = digit->Count2();
293 else counts = digit->Count1();
8f6ee336 294 counts = TMath::Max(Int_t(counts - pedM), 0);
295 if (counts > 0) AliDebug(10, "Got a hit strip");
296
1a1fdef7 297 return UShort_t(counts);
298}
299
4347b38f 300//____________________________________________________________________
8f6ee336 301Float_t
302AliFMDReconstructor::Adc2Energy(AliFMDDigit* digit,
303 Float_t /* eta */,
304 UShort_t count) const
305{
306 // Converts number of ADC counts to energy deposited.
307 // Note, that this member function can be overloaded by derived
308 // classes to do strip-specific look-ups in databases or the like,
309 // to find the proper gain for a strip.
310 //
311 // In this simple version, we calculate the energy deposited as
312 //
313 // EnergyDeposited = cos(theta) * gain * count
314 //
315 // where
316 //
317 // Pre_amp_MIP_Range
318 // gain = ----------------- * Energy_deposited_per_MIP
319 // ADC_channel_size
320 //
321 // is constant and the same for all strips.
322
323 // Double_t theta = 2 * TMath::ATan(TMath::Exp(-eta));
324 // Double_t edep = TMath::Abs(TMath::Cos(theta)) * fGain * count;
325 AliFMDParameters* param = AliFMDParameters::Instance();
326 Float_t gain = param->GetPulseGain(digit->Detector(),
327 digit->Ring(),
328 digit->Sector(),
329 digit->Strip());
330 Double_t edep = count * gain;
331 AliDebug(10, Form("Converting counts %d to energy via factor %f",
332 count, gain));
333 return edep;
334}
335
336//____________________________________________________________________
337Float_t
338AliFMDReconstructor::Energy2Multiplicity(AliFMDDigit* /* digit */,
339 Float_t edep) const
340{
341 // Converts an energy signal to number of particles.
342 // Note, that this member function can be overloaded by derived
343 // classes to do strip-specific look-ups in databases or the like,
344 // to find the proper gain for a strip.
345 //
346 // In this simple version, we calculate the multiplicity as
347 //
348 // multiplicity = Energy_deposited / Energy_deposited_per_MIP
349 //
350 // where
351 //
352 // Energy_deposited_per_MIP = 1.664 * SI_density * SI_thickness
353 //
354 // is constant and the same for all strips
355 AliFMDParameters* param = AliFMDParameters::Instance();
356 Double_t edepMIP = param->GetEdepMip();
357 Float_t mult = edep / edepMIP;
358 if (edep > 0)
359 AliDebug(10, Form("Translating energy %f to multiplicity via "
360 "divider %f->%f", edep, edepMIP, mult));
361 return mult;
362}
363
364//____________________________________________________________________
365void
366AliFMDReconstructor::PhysicalCoordinates(AliFMDDigit* digit,
367 Float_t& eta,
368 Float_t& phi) const
369{
370 // Get the eta and phi of a digit
371 //
372 // Get geometry.
9b48326f 373 AliFMDGeometry* geom = AliFMDGeometry::Instance();
bf000c32 374 Double_t x, y, z, r, theta;
9b48326f 375 geom->Detector2XYZ(digit->Detector(), digit->Ring(), digit->Sector(),
bf000c32 376 digit->Strip(), x, y, z);
377 // Correct for vertex offset.
378 z += fCurrentVertex;
379 phi = TMath::ATan2(y, x);
380 r = TMath::Sqrt(y * y + x * x);
381 theta = TMath::ATan2(r, z);
382 eta = -TMath::Log(TMath::Tan(theta / 2));
8f6ee336 383}
384
385
386
387//____________________________________________________________________
4347b38f 388void
1a1fdef7 389AliFMDReconstructor::FillESD(TTree* /* digitsTree */,
390 TTree* /* clusterTree */,
8f6ee336 391 AliESD* esd) const
121a60bd 392{
42403906 393 // nothing to be done
69b696b9 394 // FIXME: The vertex may not be known when Reconstruct is executed,
395 // so we may have to move some of that member function here.
8f6ee336 396 AliDebug(1, Form("Calling FillESD with two trees and one ESD"));
397 // fESDObj->Print();
398
399 if (esd) {
400 AliDebug(1, Form("Writing FMD data to ESD tree"));
401 esd->SetFMDData(fESDObj);
a3537838 402 }
121a60bd 403}
404
54e415a8 405
406//____________________________________________________________________
407void
408AliFMDReconstructor::Reconstruct(AliRawReader*,TTree*) const
409{
410 // Cannot be used. See member function with same name but with 2
411 // TTree arguments. Make sure you do local reconstrucion
8f6ee336 412 AliDebug(1, Form("Calling FillESD with loader and tree"));
54e415a8 413 AliError("MayNotUse");
414}
415//____________________________________________________________________
416void
417AliFMDReconstructor::Reconstruct(AliRunLoader*) const
418{
419 // Cannot be used. See member function with same name but with 2
420 // TTree arguments. Make sure you do local reconstrucion
8f6ee336 421 AliDebug(1, Form("Calling FillESD with loader"));
54e415a8 422 AliError("MayNotUse");
423}
424//____________________________________________________________________
425void
426AliFMDReconstructor::Reconstruct(AliRunLoader*, AliRawReader*) const
427{
428 // Cannot be used. See member function with same name but with 2
429 // TTree arguments. Make sure you do local reconstrucion
8f6ee336 430 AliDebug(1, Form("Calling FillESD with loader and raw reader"));
54e415a8 431 AliError("MayNotUse");
432}
433//____________________________________________________________________
434void
435AliFMDReconstructor::FillESD(AliRawReader*,TTree*,AliESD*) const
436{
437 // Cannot be used. See member function with same name but with 2
438 // TTree arguments. Make sure you do local reconstrucion
8f6ee336 439 AliDebug(1, Form("Calling FillESD with raw reader, tree, and ESD"));
54e415a8 440 AliError("MayNotUse");
441}
442//____________________________________________________________________
443void
444AliFMDReconstructor::FillESD(AliRunLoader*,AliESD*) const
445{
446 // Cannot be used. See member function with same name but with 2
447 // TTree arguments. Make sure you do local reconstrucion
8f6ee336 448 AliDebug(1, Form("Calling FillESD with loader and ESD"));
54e415a8 449 AliError("MayNotUse");
450}
451//____________________________________________________________________
452void
453AliFMDReconstructor::FillESD(AliRunLoader*,AliRawReader*,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
8f6ee336 457 AliDebug(1, Form("Calling FillESD with loader, raw reader, and ESD"));
54e415a8 458 AliError("MayNotUse");
459}
460
42403906 461//____________________________________________________________________
462//
463// EOF
464//