1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
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
21 //____________________________________________________________________
23 // This is a class that constructs AliFMDRecPoint objects from of Digits
25 // This class reads either digits from a TClonesArray or raw data from
26 // a DDL file (or similar), and stores the read ADC counts in an
27 // internal cache (fAdcs).
29 //-- Authors: Evgeny Karpechev(INR) and Alla Maevsksia
30 // Latest changes by Christian Holm Christensen <cholm@nbi.dk>
33 //____________________________________________________________________
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
50 //____________________________________________________________________
51 ClassImp(AliFMDReconstructor)
53 ; // This is here to keep Emacs for indenting the next line
56 //____________________________________________________________________
57 AliFMDReconstructor::AliFMDReconstructor()
66 // Make a new FMD reconstructor object - default CTOR.
70 //____________________________________________________________________
71 AliFMDReconstructor::AliFMDReconstructor(const AliFMDReconstructor& other)
76 fCurrentVertex(other.fCurrentVertex),
77 fESDObj(other.fESDObj),
84 //____________________________________________________________________
86 AliFMDReconstructor::operator=(const AliFMDReconstructor& other)
88 // Assignment operator
90 fNMult = other.fNMult;
91 fTreeR = other.fTreeR;
92 fCurrentVertex = other.fCurrentVertex;
93 fESDObj = other.fESDObj;
98 //____________________________________________________________________
99 AliFMDReconstructor::~AliFMDReconstructor()
102 if (fMult) fMult->Delete();
103 if (fMult) delete fMult;
104 if (fESDObj) delete fESDObj;
107 //____________________________________________________________________
109 AliFMDReconstructor::Init(AliRunLoader* runLoader)
111 // Initialize the reconstructor
112 AliDebug(1, Form("Init called with runloader 0x%x", runLoader));
113 // Initialize the geometry
114 AliFMDGeometry* geom = AliFMDGeometry::Instance();
116 geom->InitTransformations();
118 // Initialize the parameters
119 AliFMDParameters* param = AliFMDParameters::Instance();
122 // Current vertex position
124 // Create array of reconstructed strip multiplicities
125 fMult = new TClonesArray("AliFMDRecPoint", 51200);
126 // Create ESD output object
127 fESDObj = new AliESDFMD;
129 // Check that we have a run loader
131 Warning("Init", "No run loader");
135 // Check if we can get the header tree
136 AliHeader* header = runLoader->GetHeader();
138 Warning("Init", "No header");
142 // Check if we can get a simulation header
143 AliGenEventHeader* eventHeader = header->GenEventHeader();
146 eventHeader->PrimaryVertex(vtx);
147 fCurrentVertex = vtx[2];
148 AliDebug(1, Form("Primary vertex Z coordinate for event # %d/%d is %f",
149 header->GetRun(), header->GetEvent(), fCurrentVertex));
150 Warning("Init", "no generator event header");
153 Warning("Init", "No generator event header - "
154 "perhaps we get the vertex from ESD?");
158 //____________________________________________________________________
160 AliFMDReconstructor::ConvertDigits(AliRawReader* reader,
161 TTree* digitsTree) const
163 // Convert Raw digits to AliFMDDigit's in a tree
164 AliDebug(1, "Reading raw data into digits tree");
165 AliFMDRawReader rawRead(reader, digitsTree);
166 // rawRead.SetSampleRate(fFMD->GetSampleRate());
170 //____________________________________________________________________
172 AliFMDReconstructor::Reconstruct(TTree* digitsTree,
173 TTree* clusterTree) const
175 // Reconstruct event from digits in tree
176 // Get the FMD branch holding the digits.
177 // FIXME: The vertex may not be known yet, so we may have to move
178 // some of this to FillESD.
179 AliDebug(1, "Reconstructing from digits in a tree");
182 const AliESDVertex* vertex = fESD->GetVertex();
184 AliDebug(1, Form("Got vertex from ESD: %f", vertex->GetZv()));
185 fCurrentVertex = vertex->GetZv();
189 TBranch *digitBranch = digitsTree->GetBranch("FMD");
191 Error("Exec", "No digit branch for the FMD found");
194 TClonesArray* digits = new TClonesArray("AliFMDDigit");
195 digitBranch->SetAddress(&digits);
197 if (fMult) fMult->Clear();
198 if (fESDObj) fESDObj->Clear();
201 fTreeR = clusterTree;
202 fTreeR->Branch("FMD", &fMult);
204 AliDebug(5, "Getting entry 0 from digit branch");
205 digitBranch->GetEntry(0);
207 AliDebug(5, "Processing digits");
208 ProcessDigits(digits);
210 Int_t written = clusterTree->Fill();
211 AliDebug(10, Form("Filled %d bytes into cluster tree", written));
217 //____________________________________________________________________
219 AliFMDReconstructor::ProcessDigits(TClonesArray* digits) const
221 // For each digit, find the pseudo rapdity, azimuthal angle, and
222 // number of corrected ADC counts, and pass it on to the algorithms
224 Int_t nDigits = digits->GetEntries();
225 AliDebug(1, Form("Got %d digits", nDigits));
226 for (Int_t i = 0; i < nDigits; i++) {
227 AliFMDDigit* digit = static_cast<AliFMDDigit*>(digits->At(i));
228 AliFMDParameters* param = AliFMDParameters::Instance();
229 // Check that the strip is not marked as dead
230 if (param->IsDead(digit->Detector(), digit->Ring(),
231 digit->Sector(), digit->Strip())) continue;
236 PhysicalCoordinates(digit, eta, phi);
238 // Substract pedestal.
239 UShort_t counts = SubtractPedestal(digit);
241 // Gain match digits.
242 Double_t edep = Adc2Energy(digit, eta, counts);
244 // Make rough multiplicity
245 Double_t mult = Energy2Multiplicity(digit, edep);
247 AliDebug(10, Form("FMD%d%c[%2d,%3d]: "
248 "ADC: %d, Counts: %d, Energy: %f, Mult: %f",
249 digit->Detector(), digit->Ring(), digit->Sector(),
250 digit->Strip(), digit->Counts(), counts, edep, mult));
252 // Create a `RecPoint' on the output branch.
254 new ((*fMult)[fNMult]) AliFMDRecPoint(digit->Detector(),
260 (void)m; // Suppress warnings about unused variables.
263 fESDObj->SetMultiplicity(digit->Detector(), digit->Ring(),
264 digit->Sector(), digit->Strip(), mult);
265 fESDObj->SetEta(digit->Detector(), digit->Ring(),
266 digit->Sector(), digit->Strip(), eta);
270 //____________________________________________________________________
272 AliFMDReconstructor::SubtractPedestal(AliFMDDigit* digit) const
274 // Member function to subtract the pedestal from a digit
275 // This implementation does nothing, but a derived class could over
276 // load this to subtract a pedestal that was given in a database or
277 // something like that.
280 AliFMDParameters* param = AliFMDParameters::Instance();
281 Float_t pedM = param->GetPedestal(digit->Detector(),
285 AliDebug(10, Form("Subtracting pedestal %f from signal %d",
286 pedM, digit->Counts()));
287 if (digit->Count3() > 0) counts = digit->Count3();
288 else if (digit->Count2() > 0) counts = digit->Count2();
289 else counts = digit->Count1();
290 counts = TMath::Max(Int_t(counts - pedM), 0);
291 if (counts > 0) AliDebug(10, "Got a hit strip");
293 return UShort_t(counts);
296 //____________________________________________________________________
298 AliFMDReconstructor::Adc2Energy(AliFMDDigit* digit,
300 UShort_t count) const
302 // Converts number of ADC counts to energy deposited.
303 // Note, that this member function can be overloaded by derived
304 // classes to do strip-specific look-ups in databases or the like,
305 // to find the proper gain for a strip.
307 // In this simple version, we calculate the energy deposited as
309 // EnergyDeposited = cos(theta) * gain * count
314 // gain = ----------------- * Energy_deposited_per_MIP
317 // is constant and the same for all strips.
319 // Double_t theta = 2 * TMath::ATan(TMath::Exp(-eta));
320 // Double_t edep = TMath::Abs(TMath::Cos(theta)) * fGain * count;
321 AliFMDParameters* param = AliFMDParameters::Instance();
322 Float_t gain = param->GetPulseGain(digit->Detector(),
326 Double_t edep = count * gain;
327 AliDebug(10, Form("Converting counts %d to energy via factor %f",
332 //____________________________________________________________________
334 AliFMDReconstructor::Energy2Multiplicity(AliFMDDigit* /* digit */,
337 // Converts an energy signal to number of particles.
338 // Note, that this member function can be overloaded by derived
339 // classes to do strip-specific look-ups in databases or the like,
340 // to find the proper gain for a strip.
342 // In this simple version, we calculate the multiplicity as
344 // multiplicity = Energy_deposited / Energy_deposited_per_MIP
348 // Energy_deposited_per_MIP = 1.664 * SI_density * SI_thickness
350 // is constant and the same for all strips
351 AliFMDParameters* param = AliFMDParameters::Instance();
352 Double_t edepMIP = param->GetEdepMip();
353 Float_t mult = edep / edepMIP;
355 AliDebug(10, Form("Translating energy %f to multiplicity via "
356 "divider %f->%f", edep, edepMIP, mult));
360 //____________________________________________________________________
362 AliFMDReconstructor::PhysicalCoordinates(AliFMDDigit* digit,
366 // Get the eta and phi of a digit
369 AliFMDGeometry* geom = AliFMDGeometry::Instance();
370 Double_t x, y, z, r, theta;
371 geom->Detector2XYZ(digit->Detector(), digit->Ring(), digit->Sector(),
372 digit->Strip(), x, y, z);
373 // Correct for vertex offset.
375 phi = TMath::ATan2(y, x);
376 r = TMath::Sqrt(y * y + x * x);
377 theta = TMath::ATan2(r, z);
378 eta = -TMath::Log(TMath::Tan(theta / 2));
383 //____________________________________________________________________
385 AliFMDReconstructor::FillESD(TTree* /* digitsTree */,
386 TTree* /* clusterTree */,
389 // nothing to be done
390 // FIXME: The vertex may not be known when Reconstruct is executed,
391 // so we may have to move some of that member function here.
392 AliDebug(1, Form("Calling FillESD with two trees and one ESD"));
396 AliDebug(1, Form("Writing FMD data to ESD tree"));
397 esd->SetFMDData(fESDObj);
402 //____________________________________________________________________
404 AliFMDReconstructor::Reconstruct(AliRawReader*,TTree*) const
406 // Cannot be used. See member function with same name but with 2
407 // TTree arguments. Make sure you do local reconstrucion
408 AliDebug(1, Form("Calling FillESD with loader and tree"));
409 AliError("MayNotUse");
411 //____________________________________________________________________
413 AliFMDReconstructor::Reconstruct(AliRunLoader*) const
415 // Cannot be used. See member function with same name but with 2
416 // TTree arguments. Make sure you do local reconstrucion
417 AliDebug(1, Form("Calling FillESD with loader"));
418 AliError("MayNotUse");
420 //____________________________________________________________________
422 AliFMDReconstructor::Reconstruct(AliRunLoader*, AliRawReader*) const
424 // Cannot be used. See member function with same name but with 2
425 // TTree arguments. Make sure you do local reconstrucion
426 AliDebug(1, Form("Calling FillESD with loader and raw reader"));
427 AliError("MayNotUse");
429 //____________________________________________________________________
431 AliFMDReconstructor::FillESD(AliRawReader*,TTree*,AliESD*) const
433 // Cannot be used. See member function with same name but with 2
434 // TTree arguments. Make sure you do local reconstrucion
435 AliDebug(1, Form("Calling FillESD with raw reader, tree, and ESD"));
436 AliError("MayNotUse");
438 //____________________________________________________________________
440 AliFMDReconstructor::FillESD(AliRunLoader*,AliESD*) const
442 // Cannot be used. See member function with same name but with 2
443 // TTree arguments. Make sure you do local reconstrucion
444 AliDebug(1, Form("Calling FillESD with loader and ESD"));
445 AliError("MayNotUse");
447 //____________________________________________________________________
449 AliFMDReconstructor::FillESD(AliRunLoader*,AliRawReader*,AliESD*) const
451 // Cannot be used. See member function with same name but with 2
452 // TTree arguments. Make sure you do local reconstrucion
453 AliDebug(1, Form("Calling FillESD with loader, raw reader, and ESD"));
454 AliError("MayNotUse");
457 //____________________________________________________________________