Correct raw data reconstruction in case of trigger
[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 **************************************************************************/
0d0e6995 15/* $Id$ */
c2fc1258 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*/
4347b38f 21//____________________________________________________________________
42403906 22//
7684b53c 23// This is a class that constructs AliFMDMult (reconstructed
24// multiplicity) from of Digits
4347b38f 25//
26// This class reads either digits from a TClonesArray or raw data from
27// a DDL file (or similar), and stores the read ADC counts in an
28// internal cache (fAdcs).
29//
37c55dc0 30//-- Authors: Evgeny Karpechev(INR) and Alla Maevsksia
4347b38f 31// Latest changes by Christian Holm Christensen <cholm@nbi.dk>
32//
33//
34//____________________________________________________________________
37c55dc0 35
56b1929b 36#include <AliLog.h> // ALILOG_H
37#include <AliRun.h> // ALIRUN_H
38#include <AliRunLoader.h> // ALIRUNLOADER_H
39#include <AliLoader.h> // ALILOADER_H
40#include <AliHeader.h> // ALIHEADER_H
41#include <AliRawReader.h> // ALIRAWREADER_H
42#include <AliGenEventHeader.h> // ALIGENEVENTHEADER_H
1a1fdef7 43#include "AliFMD.h" // ALIFMD_H
44#include "AliFMDGeometry.h" // ALIFMDGEOMETRY_H
45#include "AliFMDParameters.h" // ALIFMDPARAMETERS_H
46#include "AliFMDDetector.h" // ALIFMDDETECTOR_H
47#include "AliFMDRing.h" // ALIFMDRING_H
56b1929b 48#include "AliFMDDigit.h" // ALIFMDDIGIT_H
49#include "AliFMDReconstructor.h" // ALIFMDRECONSTRUCTOR_H
50#include "AliFMDRawStream.h" // ALIFMDRAWSTREAM_H
51#include "AliFMDRawReader.h" // ALIFMDRAWREADER_H
bf000c32 52#include "AliFMDRecPoint.h" // ALIFMDMULTNAIIVE_H
a3537838 53#include "AliESD.h" // ALIESD_H
8f6ee336 54#include <AliESDFMD.h> // ALIESDFMD_H
55#include <TFile.h>
4347b38f 56
57//____________________________________________________________________
925e6570 58ClassImp(AliFMDReconstructor)
1a1fdef7 59#if 0
60 ; // This is here to keep Emacs for indenting the next line
61#endif
37c55dc0 62
4347b38f 63//____________________________________________________________________
64AliFMDReconstructor::AliFMDReconstructor()
65 : AliReconstructor(),
e9fd1e20 66 fMult(0x0),
67 fNMult(0),
68 fTreeR(0x0),
69 fCurrentVertex(0),
70 fESDObj(0x0),
71 fESD(0x0)
4347b38f 72{
8f6ee336 73 // Make a new FMD reconstructor object - default CTOR.
4347b38f 74}
75
42403906 76
77//____________________________________________________________________
78AliFMDReconstructor::AliFMDReconstructor(const AliFMDReconstructor& other)
8f6ee336 79 : AliReconstructor(),
80 fMult(other.fMult),
e9fd1e20 81 fNMult(other.fNMult),
82 fTreeR(other.fTreeR),
83 fCurrentVertex(other.fCurrentVertex),
84 fESDObj(other.fESDObj),
85 fESD(other.fESD)
42403906 86{
56b1929b 87 // Copy constructor
42403906 88}
89
90
91//____________________________________________________________________
92AliFMDReconstructor&
93AliFMDReconstructor::operator=(const AliFMDReconstructor& other)
94{
56b1929b 95 // Assignment operator
8f6ee336 96 fMult = other.fMult;
e9fd1e20 97 fNMult = other.fNMult;
98 fTreeR = other.fTreeR;
99 fCurrentVertex = other.fCurrentVertex;
8f6ee336 100 fESDObj = other.fESDObj;
e9fd1e20 101 fESD = other.fESD;
42403906 102 return *this;
103}
56b1929b 104
105//____________________________________________________________________
106AliFMDReconstructor::~AliFMDReconstructor()
107{
108 // Destructor
8f6ee336 109 if (fMult) fMult->Delete();
110 if (fMult) delete fMult;
111 if (fESDObj) delete fESDObj;
56b1929b 112}
4347b38f 113
114//____________________________________________________________________
115void
1a1fdef7 116AliFMDReconstructor::Init(AliRunLoader* runLoader)
117{
118 // Initialize the reconstructor
119 AliDebug(1, Form("Init called with runloader 0x%x", runLoader));
bf000c32 120 // Initialize the geometry
9b48326f 121 AliFMDGeometry* geom = AliFMDGeometry::Instance();
122 geom->Init();
123 geom->InitTransformations();
124
125 // Initialize the parameters
126 AliFMDParameters* param = AliFMDParameters::Instance();
127 param->Init();
bf000c32 128
8f6ee336 129 // Current vertex position
1a1fdef7 130 fCurrentVertex = 0;
8f6ee336 131 // Create array of reconstructed strip multiplicities
bf000c32 132 fMult = new TClonesArray("AliFMDRecPoint", 51200);
8f6ee336 133 // Create ESD output object
134 fESDObj = new AliESDFMD;
135
136 // Check that we have a run loader
1a1fdef7 137 if (!runLoader) {
138 Warning("Init", "No run loader");
4347b38f 139 return;
140 }
8f6ee336 141
142 // Check if we can get the header tree
1a1fdef7 143 AliHeader* header = runLoader->GetHeader();
144 if (!header) {
145 Warning("Init", "No header");
4347b38f 146 return;
147 }
8f6ee336 148
149 // Check if we can get a simulation header
1a1fdef7 150 AliGenEventHeader* eventHeader = header->GenEventHeader();
a3537838 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?");
4347b38f 162 }
4347b38f 163}
dc8af42e 164
4347b38f 165//____________________________________________________________________
166void
1a1fdef7 167AliFMDReconstructor::ConvertDigits(AliRawReader* reader,
168 TTree* digitsTree) const
169{
170 // Convert Raw digits to AliFMDDigit's in a tree
8f6ee336 171 AliDebug(1, "Reading raw data into digits tree");
1a1fdef7 172 AliFMDRawReader rawRead(reader, digitsTree);
173 // rawRead.SetSampleRate(fFMD->GetSampleRate());
174 rawRead.Exec();
4347b38f 175}
176
4347b38f 177//____________________________________________________________________
178void
1a1fdef7 179AliFMDReconstructor::Reconstruct(TTree* digitsTree,
180 TTree* clusterTree) const
4347b38f 181{
1a1fdef7 182 // Reconstruct event from digits in tree
4347b38f 183 // Get the FMD branch holding the digits.
69b696b9 184 // FIXME: The vertex may not be known yet, so we may have to move
185 // some of this to FillESD.
1a1fdef7 186 AliDebug(1, "Reconstructing from digits in a tree");
1e8f773e 187#if 1
a3537838 188 if (fESD) {
8f6ee336 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 }
a3537838 194 }
54e415a8 195#endif
1a1fdef7 196 TBranch *digitBranch = digitsTree->GetBranch("FMD");
4347b38f 197 if (!digitBranch) {
1a1fdef7 198 Error("Exec", "No digit branch for the FMD found");
199 return;
4347b38f 200 }
0abe7182 201 TClonesArray* digits = new TClonesArray("AliFMDDigit");
1a1fdef7 202 digitBranch->SetAddress(&digits);
4347b38f 203
8f6ee336 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");
1a1fdef7 212 digitBranch->GetEntry(0);
213
8f6ee336 214 AliDebug(5, "Processing digits");
e802be3e 215 ProcessDigits(digits);
216
8f6ee336 217 Int_t written = clusterTree->Fill();
218 AliDebug(10, Form("Filled %d bytes into cluster tree", written));
0abe7182 219 digits->Delete();
220 delete digits;
4347b38f 221}
1a1fdef7 222
8f6ee336 223
4347b38f 224//____________________________________________________________________
e802be3e 225void
226AliFMDReconstructor::ProcessDigits(TClonesArray* digits) const
4347b38f 227{
69b696b9 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.
e802be3e 231 Int_t nDigits = digits->GetEntries();
1a1fdef7 232 AliDebug(1, Form("Got %d digits", nDigits));
e802be3e 233 for (Int_t i = 0; i < nDigits; i++) {
234 AliFMDDigit* digit = static_cast<AliFMDDigit*>(digits->At(i));
8f6ee336 235 AliFMDParameters* param = AliFMDParameters::Instance();
236 // Check that the strip is not marked as dead
237 if (param->IsDead(digit->Detector(), digit->Ring(),
238 digit->Sector(), digit->Strip())) continue;
239
240 // digit->Print();
241 // Get eta and phi
242 Float_t eta, phi;
243 PhysicalCoordinates(digit, eta, phi);
4347b38f 244
8f6ee336 245 // Substract pedestal.
e802be3e 246 UShort_t counts = SubtractPedestal(digit);
4347b38f 247
8f6ee336 248 // Gain match digits.
249 Double_t edep = Adc2Energy(digit, eta, counts);
250
251 // Make rough multiplicity
252 Double_t mult = Energy2Multiplicity(digit, edep);
253
254 AliDebug(10, Form("FMD%d%c[%2d,%3d]: "
255 "ADC: %d, Counts: %d, Energy: %f, Mult: %f",
256 digit->Detector(), digit->Ring(), digit->Sector(),
257 digit->Strip(), digit->Counts(), counts, edep, mult));
258
259 // Create a `RecPoint' on the output branch.
bf000c32 260 AliFMDRecPoint* m =
261 new ((*fMult)[fNMult]) AliFMDRecPoint(digit->Detector(),
262 digit->Ring(),
263 digit->Sector(),
264 digit->Strip(),
265 eta, phi,
266 edep, mult);
8f6ee336 267 (void)m; // Suppress warnings about unused variables.
268 fNMult++;
269
270 fESDObj->SetMultiplicity(digit->Detector(), digit->Ring(),
271 digit->Sector(), digit->Strip(), mult);
272 fESDObj->SetEta(digit->Detector(), digit->Ring(),
273 digit->Sector(), digit->Strip(), eta);
4347b38f 274 }
4347b38f 275}
8f6ee336 276
1a1fdef7 277//____________________________________________________________________
278UShort_t
279AliFMDReconstructor::SubtractPedestal(AliFMDDigit* digit) const
280{
281 // Member function to subtract the pedestal from a digit
282 // This implementation does nothing, but a derived class could over
283 // load this to subtract a pedestal that was given in a database or
284 // something like that.
285
8f6ee336 286 Int_t counts = 0;
287 AliFMDParameters* param = AliFMDParameters::Instance();
288 Float_t pedM = param->GetPedestal(digit->Detector(),
289 digit->Ring(),
290 digit->Sector(),
291 digit->Strip());
292 AliDebug(10, Form("Subtracting pedestal %f from signal %d",
293 pedM, digit->Counts()));
1a1fdef7 294 if (digit->Count3() > 0) counts = digit->Count3();
295 else if (digit->Count2() > 0) counts = digit->Count2();
296 else counts = digit->Count1();
8f6ee336 297 counts = TMath::Max(Int_t(counts - pedM), 0);
298 if (counts > 0) AliDebug(10, "Got a hit strip");
299
1a1fdef7 300 return UShort_t(counts);
301}
302
4347b38f 303//____________________________________________________________________
8f6ee336 304Float_t
305AliFMDReconstructor::Adc2Energy(AliFMDDigit* digit,
306 Float_t /* eta */,
307 UShort_t count) const
308{
309 // Converts number of ADC counts to energy deposited.
310 // Note, that this member function can be overloaded by derived
311 // classes to do strip-specific look-ups in databases or the like,
312 // to find the proper gain for a strip.
313 //
314 // In this simple version, we calculate the energy deposited as
315 //
316 // EnergyDeposited = cos(theta) * gain * count
317 //
318 // where
319 //
320 // Pre_amp_MIP_Range
321 // gain = ----------------- * Energy_deposited_per_MIP
322 // ADC_channel_size
323 //
324 // is constant and the same for all strips.
325
326 // Double_t theta = 2 * TMath::ATan(TMath::Exp(-eta));
327 // Double_t edep = TMath::Abs(TMath::Cos(theta)) * fGain * count;
328 AliFMDParameters* param = AliFMDParameters::Instance();
329 Float_t gain = param->GetPulseGain(digit->Detector(),
330 digit->Ring(),
331 digit->Sector(),
332 digit->Strip());
333 Double_t edep = count * gain;
334 AliDebug(10, Form("Converting counts %d to energy via factor %f",
335 count, gain));
336 return edep;
337}
338
339//____________________________________________________________________
340Float_t
341AliFMDReconstructor::Energy2Multiplicity(AliFMDDigit* /* digit */,
342 Float_t edep) const
343{
344 // Converts an energy signal to number of particles.
345 // Note, that this member function can be overloaded by derived
346 // classes to do strip-specific look-ups in databases or the like,
347 // to find the proper gain for a strip.
348 //
349 // In this simple version, we calculate the multiplicity as
350 //
351 // multiplicity = Energy_deposited / Energy_deposited_per_MIP
352 //
353 // where
354 //
355 // Energy_deposited_per_MIP = 1.664 * SI_density * SI_thickness
356 //
357 // is constant and the same for all strips
358 AliFMDParameters* param = AliFMDParameters::Instance();
359 Double_t edepMIP = param->GetEdepMip();
360 Float_t mult = edep / edepMIP;
361 if (edep > 0)
362 AliDebug(10, Form("Translating energy %f to multiplicity via "
363 "divider %f->%f", edep, edepMIP, mult));
364 return mult;
365}
366
367//____________________________________________________________________
368void
369AliFMDReconstructor::PhysicalCoordinates(AliFMDDigit* digit,
370 Float_t& eta,
371 Float_t& phi) const
372{
373 // Get the eta and phi of a digit
374 //
375 // Get geometry.
9b48326f 376 AliFMDGeometry* geom = AliFMDGeometry::Instance();
bf000c32 377 Double_t x, y, z, r, theta;
9b48326f 378 geom->Detector2XYZ(digit->Detector(), digit->Ring(), digit->Sector(),
bf000c32 379 digit->Strip(), x, y, z);
380 // Correct for vertex offset.
381 z += fCurrentVertex;
382 phi = TMath::ATan2(y, x);
383 r = TMath::Sqrt(y * y + x * x);
384 theta = TMath::ATan2(r, z);
385 eta = -TMath::Log(TMath::Tan(theta / 2));
8f6ee336 386}
387
388
389
390//____________________________________________________________________
4347b38f 391void
1a1fdef7 392AliFMDReconstructor::FillESD(TTree* /* digitsTree */,
393 TTree* /* clusterTree */,
8f6ee336 394 AliESD* esd) const
121a60bd 395{
42403906 396 // nothing to be done
69b696b9 397 // FIXME: The vertex may not be known when Reconstruct is executed,
398 // so we may have to move some of that member function here.
8f6ee336 399 AliDebug(1, Form("Calling FillESD with two trees and one ESD"));
400 // fESDObj->Print();
401
402 if (esd) {
403 AliDebug(1, Form("Writing FMD data to ESD tree"));
404 esd->SetFMDData(fESDObj);
a3537838 405 }
121a60bd 406}
407
54e415a8 408
409//____________________________________________________________________
410void
411AliFMDReconstructor::Reconstruct(AliRawReader*,TTree*) const
412{
413 // Cannot be used. See member function with same name but with 2
414 // TTree arguments. Make sure you do local reconstrucion
8f6ee336 415 AliDebug(1, Form("Calling FillESD with loader and tree"));
54e415a8 416 AliError("MayNotUse");
417}
418//____________________________________________________________________
419void
420AliFMDReconstructor::Reconstruct(AliRunLoader*) const
421{
422 // Cannot be used. See member function with same name but with 2
423 // TTree arguments. Make sure you do local reconstrucion
8f6ee336 424 AliDebug(1, Form("Calling FillESD with loader"));
54e415a8 425 AliError("MayNotUse");
426}
427//____________________________________________________________________
428void
429AliFMDReconstructor::Reconstruct(AliRunLoader*, AliRawReader*) const
430{
431 // Cannot be used. See member function with same name but with 2
432 // TTree arguments. Make sure you do local reconstrucion
8f6ee336 433 AliDebug(1, Form("Calling FillESD with loader and raw reader"));
54e415a8 434 AliError("MayNotUse");
435}
436//____________________________________________________________________
437void
438AliFMDReconstructor::FillESD(AliRawReader*,TTree*,AliESD*) const
439{
440 // Cannot be used. See member function with same name but with 2
441 // TTree arguments. Make sure you do local reconstrucion
8f6ee336 442 AliDebug(1, Form("Calling FillESD with raw reader, tree, and ESD"));
54e415a8 443 AliError("MayNotUse");
444}
445//____________________________________________________________________
446void
447AliFMDReconstructor::FillESD(AliRunLoader*,AliESD*) const
448{
449 // Cannot be used. See member function with same name but with 2
450 // TTree arguments. Make sure you do local reconstrucion
8f6ee336 451 AliDebug(1, Form("Calling FillESD with loader and ESD"));
54e415a8 452 AliError("MayNotUse");
453}
454//____________________________________________________________________
455void
456AliFMDReconstructor::FillESD(AliRunLoader*,AliRawReader*,AliESD*) const
457{
458 // Cannot be used. See member function with same name but with 2
459 // TTree arguments. Make sure you do local reconstrucion
8f6ee336 460 AliDebug(1, Form("Calling FillESD with loader, raw reader, and ESD"));
54e415a8 461 AliError("MayNotUse");
462}
463
42403906 464//____________________________________________________________________
465//
466// EOF
467//