Changes in the clusterizer requested by MinJung
[u/mrichter/AliRoot.git] / TRD / AliTRDclusterizerV1.cxx
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cb86ff6e 1
f7336fa3 2/**************************************************************************
3 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * *
5 * Author: The ALICE Off-line Project. *
6 * Contributors are mentioned in the code where appropriate. *
7 * *
8 * Permission to use, copy, modify and distribute this software and its *
9 * documentation strictly for non-commercial purposes is hereby granted *
10 * without fee, provided that the above copyright notice appears in all *
11 * copies and that both the copyright notice and this permission notice *
12 * appear in the supporting documentation. The authors make no claims *
13 * about the suitability of this software for any purpose. It is *
14 * provided "as is" without express or implied warranty. *
15 **************************************************************************/
16
88cb7938 17/* $Id$ */
f7336fa3 18
19///////////////////////////////////////////////////////////////////////////////
20// //
6d50f529 21// TRD cluster finder //
f7336fa3 22// //
23///////////////////////////////////////////////////////////////////////////////
24
25#include <TF1.h>
94de3818 26#include <TTree.h>
793ff80c 27#include <TH1.h>
a819a5f7 28#include <TFile.h>
f7336fa3 29
88cb7938 30#include "AliRunLoader.h"
31#include "AliLoader.h"
928e9fae 32#include "AliRawReader.h"
6d50f529 33#include "AliLog.h"
793ff80c 34
f7336fa3 35#include "AliTRDclusterizerV1.h"
f7336fa3 36#include "AliTRDgeometry.h"
6f1e466d 37#include "AliTRDdataArrayF.h"
793ff80c 38#include "AliTRDdataArrayI.h"
39#include "AliTRDdigitsManager.h"
a5cadd36 40#include "AliTRDpadPlane.h"
928e9fae 41#include "AliTRDrawData.h"
3551db50 42#include "AliTRDcalibDB.h"
3becff3c 43#include "AliTRDSimParam.h"
3551db50 44#include "AliTRDRecParam.h"
45#include "AliTRDCommonParam.h"
c85a4951 46#include "AliTRDcluster.h"
f7336fa3 47
48ClassImp(AliTRDclusterizerV1)
49
50//_____________________________________________________________________________
6d50f529 51AliTRDclusterizerV1::AliTRDclusterizerV1()
52 :AliTRDclusterizer()
53 ,fDigitsManager(NULL)
f7336fa3 54{
55 //
56 // AliTRDclusterizerV1 default constructor
57 //
58
f7336fa3 59}
60
61//_____________________________________________________________________________
a6dd11e9 62AliTRDclusterizerV1::AliTRDclusterizerV1(const Text_t *name, const Text_t *title)
6d50f529 63 :AliTRDclusterizer(name,title)
64 ,fDigitsManager(new AliTRDdigitsManager())
f7336fa3 65{
66 //
6d50f529 67 // AliTRDclusterizerV1 constructor
f7336fa3 68 //
69
17b26de4 70 fDigitsManager->CreateArrays();
f7336fa3 71
72}
73
8230f242 74//_____________________________________________________________________________
dd9a6ee3 75AliTRDclusterizerV1::AliTRDclusterizerV1(const AliTRDclusterizerV1 &c)
6d50f529 76 :AliTRDclusterizer(c)
77 ,fDigitsManager(NULL)
8230f242 78{
79 //
80 // AliTRDclusterizerV1 copy constructor
81 //
82
8230f242 83}
84
f7336fa3 85//_____________________________________________________________________________
86AliTRDclusterizerV1::~AliTRDclusterizerV1()
87{
8230f242 88 //
89 // AliTRDclusterizerV1 destructor
90 //
f7336fa3 91
6f1e466d 92 if (fDigitsManager) {
93 delete fDigitsManager;
abaf1f1d 94 fDigitsManager = NULL;
f7336fa3 95 }
96
97}
98
dd9a6ee3 99//_____________________________________________________________________________
100AliTRDclusterizerV1 &AliTRDclusterizerV1::operator=(const AliTRDclusterizerV1 &c)
101{
102 //
103 // Assignment operator
104 //
105
106 if (this != &c) ((AliTRDclusterizerV1 &) c).Copy(*this);
107 return *this;
108
109}
110
8230f242 111//_____________________________________________________________________________
e0d47c25 112void AliTRDclusterizerV1::Copy(TObject &c) const
8230f242 113{
114 //
115 // Copy function
116 //
117
17b26de4 118 ((AliTRDclusterizerV1 &) c).fDigitsManager = 0;
8230f242 119
120 AliTRDclusterizer::Copy(c);
121
122}
123
f7336fa3 124//_____________________________________________________________________________
125Bool_t AliTRDclusterizerV1::ReadDigits()
126{
127 //
128 // Reads the digits arrays from the input aliroot file
129 //
130
88cb7938 131 if (!fRunLoader) {
6d50f529 132 AliError("No run loader available");
f7336fa3 133 return kFALSE;
134 }
6d50f529 135
88cb7938 136 AliLoader* loader = fRunLoader->GetLoader("TRDLoader");
6d50f529 137 if (!loader->TreeD()) {
138 loader->LoadDigits();
139 }
abaf1f1d 140
f7336fa3 141 // Read in the digit arrays
88cb7938 142 return (fDigitsManager->ReadDigits(loader->TreeD()));
f7336fa3 143
144}
145
928e9fae 146//_____________________________________________________________________________
a6dd11e9 147Bool_t AliTRDclusterizerV1::ReadDigits(AliRawReader *rawReader)
928e9fae 148{
149 //
150 // Reads the digits arrays from the ddl file
151 //
152
4ab68796 153 AliTRDrawData raw;
4ab68796 154 fDigitsManager = raw.Raw2Digits(rawReader);
928e9fae 155
156 return kTRUE;
157
158}
159
f7336fa3 160//_____________________________________________________________________________
793ff80c 161Bool_t AliTRDclusterizerV1::MakeClusters()
f7336fa3 162{
163 //
164 // Generates the cluster.
165 //
166
6d50f529 167 Int_t row = 0;
168 Int_t col = 0;
169 Int_t time = 0;
170 Int_t icham = 0;
171 Int_t iplan = 0;
172 Int_t isect = 0;
173 Int_t iPad = 0;
174
175 AliTRDdataArrayI *digitsIn;
a6dd11e9 176 AliTRDdataArrayI *tracksIn;
f7336fa3 177
178 // Get the geometry
6d50f529 179 AliTRDgeometry *geo = AliTRDgeometry::GetGeometry(fRunLoader);
a6dd11e9 180
6d50f529 181 AliTRDcalibDB *calibration = AliTRDcalibDB::Instance();
182 if (!calibration) {
183 AliError("No AliTRDcalibDB instance available\n");
3551db50 184 return kFALSE;
185 }
186
6d50f529 187 AliTRDSimParam *simParam = AliTRDSimParam::Instance();
188 if (!simParam) {
189 AliError("No AliTRDSimParam instance available\n");
3becff3c 190 return kFALSE;
191 }
192
6d50f529 193 AliTRDRecParam *recParam = AliTRDRecParam::Instance();
194 if (!recParam) {
195 AliError("No AliTRDRecParam instance available\n");
3551db50 196 return kFALSE;
197 }
198
6d50f529 199 AliTRDCommonParam *commonParam = AliTRDCommonParam::Instance();
200 if (!commonParam) {
201 AliError("Could not get common parameters\n");
3551db50 202 return kFALSE;
203 }
f7336fa3 204
6d50f529 205 // ADC threshols
a6dd11e9 206 Float_t ADCthreshold = simParam->GetADCthreshold();
3e1a3ad8 207 // Threshold value for the maximum
a6dd11e9 208 Float_t maxThresh = recParam->GetClusMaxThresh();
3e1a3ad8 209 // Threshold value for the digit signal
a6dd11e9 210 Float_t sigThresh = recParam->GetClusSigThresh();
6d50f529 211
f7336fa3 212 // Iteration limit for unfolding procedure
8230f242 213 const Float_t kEpsilon = 0.01;
8230f242 214 const Int_t kNclus = 3;
215 const Int_t kNsig = 5;
a6dd11e9 216 const Int_t kNdict = AliTRDdigitsManager::kNDict;
217 const Int_t kNtrack = kNdict * kNclus;
3e1a3ad8 218
a5cadd36 219 Int_t iType = 0;
7ad19338 220 Int_t iUnfold = 0;
a5cadd36 221 Double_t ratioLeft = 1.0;
222 Double_t ratioRight = 1.0;
db30bf0f 223
a6dd11e9 224 Int_t iClusterROC = 0;
225
a5cadd36 226 Double_t padSignal[kNsig];
227 Double_t clusterSignal[kNclus];
228 Double_t clusterPads[kNclus];
f7336fa3 229
6d50f529 230 Int_t chamBeg = 0;
231 Int_t chamEnd = AliTRDgeometry::Ncham();
232 Int_t planBeg = 0;
233 Int_t planEnd = AliTRDgeometry::Nplan();
234 Int_t sectBeg = 0;
235 Int_t sectEnd = AliTRDgeometry::Nsect();
236 Int_t nTimeTotal = calibration->GetNumberOfTimeBins();
f7336fa3 237
a6dd11e9 238 Int_t dummy[9] = { 0, 0, 0, 0, 0, 0, 0, 0, 0 };
239
6d50f529 240 AliDebug(1,Form("Number of Time Bins = %d.\n",nTimeTotal));
3becff3c 241
3e1a3ad8 242 // Start clustering in every chamber
6d50f529 243 for (icham = chamBeg; icham < chamEnd; icham++) {
244 for (iplan = planBeg; iplan < planEnd; iplan++) {
245 for (isect = sectBeg; isect < sectEnd; isect++) {
f7336fa3 246
a6dd11e9 247 Int_t idet = geo->GetDetector(iplan,icham,isect);
248
249 // Get the digits
250 digitsIn = fDigitsManager->GetDigits(idet);
251 // This is to take care of switched off super modules
252 if (digitsIn->GetNtime() == 0) {
253 continue;
254 }
255 digitsIn->Expand();
256 AliTRDdataArrayI *tracksTmp = fDigitsManager->GetDictionary(idet,0);
257 tracksTmp->Expand();
258
3becff3c 259 Int_t nRowMax = commonParam->GetRowMax(iplan,icham,isect);
260 Int_t nColMax = commonParam->GetColMax(iplan);
f7336fa3 261
6d50f529 262 AliTRDpadPlane *padPlane = commonParam->GetPadPlane(iplan,icham);
263
db30bf0f 264 Int_t nClusters = 0;
265 Int_t nClusters2pad = 0;
266 Int_t nClusters3pad = 0;
267 Int_t nClusters4pad = 0;
268 Int_t nClusters5pad = 0;
269 Int_t nClustersLarge = 0;
3e1a3ad8 270
a6dd11e9 271 // Apply the gain and the tail cancelation via digital filter
6d50f529 272 AliTRDdataArrayF *digitsOut = new AliTRDdataArrayF(digitsIn->GetNrow()
273 ,digitsIn->GetNcol()
274 ,digitsIn->GetNtime());
a6dd11e9 275 Transform(digitsIn,digitsOut,idet,nRowMax,nColMax,nTimeTotal,ADCthreshold);
276
277 // Input digits are not needed any more
278 digitsIn->Compress(1,0);
6d50f529 279
3e1a3ad8 280 // Loop through the chamber and find the maxima
281 for ( row = 0; row < nRowMax; row++) {
de4b10e5 282 for ( col = 2; col < nColMax; col++) {
3e1a3ad8 283 for (time = 0; time < nTimeTotal; time++) {
284
11dc3a9e 285 Float_t signalL = TMath::Abs(digitsOut->GetDataUnchecked(row,col ,time));
286 Float_t signalM = TMath::Abs(digitsOut->GetDataUnchecked(row,col-1,time));
287 Float_t signalR = TMath::Abs(digitsOut->GetDataUnchecked(row,col-2,time));
3e1a3ad8 288
289 // Look for the maximum
db30bf0f 290 if (signalM >= maxThresh) {
6d50f529 291 if ((TMath::Abs(signalL) <= signalM) &&
a6dd11e9 292 (TMath::Abs(signalR) <= signalM)) {
6493a90f 293 if ((TMath::Abs(signalL) >= sigThresh) ||
294 (TMath::Abs(signalR) >= sigThresh)) {
a6dd11e9 295 // Maximum found, mark the position by a negative signal
296 digitsOut->SetDataUnchecked(row,col-1,time,-signalM);
297 }
3e1a3ad8 298 }
299 }
6d50f529 300
301 }
302 }
303 }
a6dd11e9 304 tracksTmp->Compress(1,0);
305
306 // The index to the first cluster of a given ROC
307 Int_t firstClusterROC = -1;
308 // The number of cluster in a given ROC
309 Int_t nClusterROC = 0;
3e1a3ad8 310
311 // Now check the maxima and calculate the cluster position
312 for ( row = 0; row < nRowMax ; row++) {
db30bf0f 313 for (time = 0; time < nTimeTotal; time++) {
314 for ( col = 1; col < nColMax-1; col++) {
3e1a3ad8 315
316 // Maximum found ?
a6dd11e9 317 if (digitsOut->GetDataUnchecked(row,col,time) < 0.0) {
f7336fa3 318
8230f242 319 for (iPad = 0; iPad < kNclus; iPad++) {
3e1a3ad8 320 Int_t iPadCol = col - 1 + iPad;
a6dd11e9 321 clusterSignal[iPad] =
322 TMath::Abs(digitsOut->GetDataUnchecked(row,iPadCol,time));
f7336fa3 323 }
324
db30bf0f 325 // Count the number of pads in the cluster
326 Int_t nPadCount = 0;
a6dd11e9 327 Int_t ii;
328 // Look to the left
329 ii = 0;
6d50f529 330 while (TMath::Abs(digitsOut->GetDataUnchecked(row,col-ii ,time)) >= sigThresh) {
db30bf0f 331 nPadCount++;
332 ii++;
333 if (col-ii < 0) break;
334 }
a6dd11e9 335 // Look to the right
db30bf0f 336 ii = 0;
6d50f529 337 while (TMath::Abs(digitsOut->GetDataUnchecked(row,col+ii+1,time)) >= sigThresh) {
db30bf0f 338 nPadCount++;
339 ii++;
340 if (col+ii+1 >= nColMax) break;
341 }
db30bf0f 342 nClusters++;
343 switch (nPadCount) {
344 case 2:
345 iType = 0;
346 nClusters2pad++;
347 break;
348 case 3:
349 iType = 1;
350 nClusters3pad++;
351 break;
352 case 4:
353 iType = 2;
354 nClusters4pad++;
355 break;
356 case 5:
357 iType = 3;
358 nClusters5pad++;
359 break;
360 default:
361 iType = 4;
362 nClustersLarge++;
363 break;
364 };
365
6d50f529 366 // Look for 5 pad cluster with minimum in the middle
db30bf0f 367 Bool_t fivePadCluster = kFALSE;
6d50f529 368 if (col < (nColMax - 3)) {
3becff3c 369 if (digitsOut->GetDataUnchecked(row,col+2,time) < 0) {
db30bf0f 370 fivePadCluster = kTRUE;
371 }
6d50f529 372 if ((fivePadCluster) && (col < (nColMax - 5))) {
3becff3c 373 if (digitsOut->GetDataUnchecked(row,col+4,time) >= sigThresh) {
db30bf0f 374 fivePadCluster = kFALSE;
375 }
376 }
6d50f529 377 if ((fivePadCluster) && (col > 1)) {
3becff3c 378 if (digitsOut->GetDataUnchecked(row,col-2,time) >= sigThresh) {
db30bf0f 379 fivePadCluster = kFALSE;
380 }
381 }
382 }
383
384 // 5 pad cluster
385 // Modify the signal of the overlapping pad for the left part
386 // of the cluster which remains from a previous unfolding
387 if (iUnfold) {
388 clusterSignal[0] *= ratioLeft;
7ad19338 389 iType = 5;
db30bf0f 390 iUnfold = 0;
391 }
392
393 // Unfold the 5 pad cluster
394 if (fivePadCluster) {
395 for (iPad = 0; iPad < kNsig; iPad++) {
3becff3c 396 padSignal[iPad] = TMath::Abs(digitsOut->GetDataUnchecked(row
a6dd11e9 397 ,col-1+iPad
398 ,time));
f7336fa3 399 }
db30bf0f 400 // Unfold the two maxima and set the signal on
401 // the overlapping pad to the ratio
17b26de4 402 ratioRight = Unfold(kEpsilon,iplan,padSignal);
db30bf0f 403 ratioLeft = 1.0 - ratioRight;
404 clusterSignal[2] *= ratioRight;
7ad19338 405 iType = 5;
db30bf0f 406 iUnfold = 1;
f7336fa3 407 }
f7336fa3 408
a5cadd36 409 Double_t clusterCharge = clusterSignal[0]
410 + clusterSignal[1]
411 + clusterSignal[2];
3e1a3ad8 412
db30bf0f 413 // The position of the cluster
a6dd11e9 414 clusterPads[0] = row + 0.5;
3e1a3ad8 415 // Take the shift of the additional time bins into account
dde59437 416 clusterPads[2] = time + 0.5;
3e1a3ad8 417
3551db50 418 if (recParam->LUTOn()) {
db30bf0f 419 // Calculate the position of the cluster by using the
420 // lookup table method
3becff3c 421 clusterPads[1] = recParam->LUTposition(iplan,clusterSignal[0]
6d50f529 422 ,clusterSignal[1]
423 ,clusterSignal[2]);
db30bf0f 424 }
425 else {
db30bf0f 426 // Calculate the position of the cluster by using the
427 // center of gravity method
a6dd11e9 428 for (Int_t i = 0; i < kNsig; i++) {
429 padSignal[i] = 0.0;
6d50f529 430 }
a6dd11e9 431 padSignal[2] = TMath::Abs(digitsOut->GetDataUnchecked(row,col ,time)); // Central pad
432 padSignal[1] = TMath::Abs(digitsOut->GetDataUnchecked(row,col-1,time)); // Left pad
433 padSignal[3] = TMath::Abs(digitsOut->GetDataUnchecked(row,col+1,time)); // Right pad
6d50f529 434 if ((col > 2) &&
435 (TMath::Abs(digitsOut->GetDataUnchecked(row,col-2,time)) < padSignal[1])) {
3becff3c 436 padSignal[0] = TMath::Abs(digitsOut->GetDataUnchecked(row,col-2,time));
7ad19338 437 }
6d50f529 438 if ((col < nColMax - 3) &&
439 (TMath::Abs(digitsOut->GetDataUnchecked(row,col+2,time)) < padSignal[3])) {
3becff3c 440 padSignal[4] = TMath::Abs(digitsOut->GetDataUnchecked(row,col+2,time));
7ad19338 441 }
6d50f529 442 clusterPads[1] = GetCOG(padSignal);
db30bf0f 443 }
444
a5cadd36 445 Double_t q0 = clusterSignal[0];
446 Double_t q1 = clusterSignal[1];
447 Double_t q2 = clusterSignal[2];
a6dd11e9 448 Double_t clusterSigmaY2 = (q1 * (q0 + q2) + 4.0 * q0 * q2)
449 / (clusterCharge*clusterCharge);
a819a5f7 450
6d50f529 451 //
3551db50 452 // Calculate the position and the error
6d50f529 453 //
454
455 // Correct for t0
a6dd11e9 456 Int_t clusterTimeBin = TMath::Nint(time - calibration->GetT0(idet,col,row));
6d50f529 457 Double_t colSize = padPlane->GetColSize(col);
458 Double_t rowSize = padPlane->GetRowSize(row);
cb86ff6e 459
a5cadd36 460 Double_t clusterPos[3];
a6dd11e9 461 clusterPos[0] = padPlane->GetColPos(col) - (clusterPads[1] + 0.5) * colSize;
462 clusterPos[1] = padPlane->GetRowPos(row) - 0.5 * rowSize;
6d50f529 463 clusterPos[2] = CalcXposFromTimebin(clusterPads[2],idet,col,row);
a5cadd36 464 Double_t clusterSig[2];
a6dd11e9 465 clusterSig[0] = (clusterSigmaY2 + 1.0/12.0) * colSize*colSize;
466 clusterSig[1] = rowSize * rowSize / 12.0;
3551db50 467
a6dd11e9 468 // Add the cluster to the output array
469 // The track indices will be stored later
470 AliTRDcluster *cluster = AddCluster(clusterPos
471 ,clusterTimeBin
472 ,idet
473 ,clusterCharge
474 ,dummy
475 ,clusterSig
476 ,iType
477 ,clusterPads[1]);
478
479 // Store the amplitudes of the pads in the cluster for later analysis
480 Short_t signals[7] = { 0, 0, 0, 0, 0, 0, 0 };
6d50f529 481 for (Int_t jPad = col-3; jPad <= col+3; jPad++) {
a6dd11e9 482 if ((jPad < 0) ||
483 (jPad >= nColMax-1)) {
6d50f529 484 continue;
485 }
11dc3a9e 486 signals[jPad-col+3] = TMath::Nint(TMath::Abs(digitsOut->GetDataUnchecked(row,jPad,time)));
c85a4951 487 }
488 cluster->SetSignals(signals);
6d50f529 489
a6dd11e9 490 // Temporarily store the row, column and time bin of the center pad
491 // Used to later on assign the track indices
492 cluster->SetLabel( row,0);
493 cluster->SetLabel( col,1);
494 cluster->SetLabel(time,2);
6d50f529 495
a6dd11e9 496 // Store the index of the first cluster in the current ROC
497 if (firstClusterROC < 0) {
498 firstClusterROC = RecPoints()->GetEntriesFast() - 1;
499 }
500 // Count the number of cluster in the current ROC
501 nClusterROC++;
502
503 } // if: Maximum found ?
504
505 } // loop: pad columns
506 } // loop: time bins
507 } // loop: pad rows
11dc3a9e 508
509 delete digitsOut;
f7336fa3 510
a6dd11e9 511 //
512 // Add the track indices to the found clusters
513 //
514
515 // Temporary array to collect the track indices
516 Int_t *idxTracks = new Int_t[kNtrack*nClusterROC];
517
518 // Loop through the dictionary arrays one-by-one
519 // to keep memory consumption low
520 for (Int_t iDict = 0; iDict < kNdict; iDict++) {
521
522 tracksIn = fDigitsManager->GetDictionary(idet,iDict);
523 tracksIn->Expand();
524
525 // Loop though the clusters found in this ROC
526 for (iClusterROC = 0; iClusterROC < nClusterROC; iClusterROC++) {
527
528 AliTRDcluster *cluster = (AliTRDcluster *)
529 RecPoints()->UncheckedAt(firstClusterROC+iClusterROC);
530 row = cluster->GetLabel(0);
531 col = cluster->GetLabel(1);
532 time = cluster->GetLabel(2);
533
534 for (iPad = 0; iPad < kNclus; iPad++) {
535 Int_t iPadCol = col - 1 + iPad;
536 Int_t index = tracksIn->GetDataUnchecked(row,iPadCol,time) - 1;
537 idxTracks[3*iPad+iDict + iClusterROC*kNtrack] = index;
538 }
539
540 }
541
542 // Compress the arrays
543 tracksIn->Compress(1,0);
544
545 }
546
547 // Copy the track indices into the cluster
548 // Loop though the clusters found in this ROC
549 for (iClusterROC = 0; iClusterROC < nClusterROC; iClusterROC++) {
550
551 AliTRDcluster *cluster = (AliTRDcluster *)
552 RecPoints()->UncheckedAt(firstClusterROC+iClusterROC);
553 cluster->SetLabel(-9999,0);
554 cluster->SetLabel(-9999,1);
555 cluster->SetLabel(-9999,2);
556
557 cluster->AddTrackIndex(&idxTracks[iClusterROC*kNtrack]);
558
559 }
560
561 delete [] idxTracks;
f7336fa3 562
3e1a3ad8 563 // Write the cluster and reset the array
793ff80c 564 WriteClusters(idet);
bdbb05bb 565 ResetRecPoints();
6d50f529 566
a6dd11e9 567 } // loop: Sectors
568 } // loop: Planes
569 } // loop: Chambers
f7336fa3 570
f7336fa3 571 return kTRUE;
572
573}
574
a305677e 575//_____________________________________________________________________________
7ad19338 576Double_t AliTRDclusterizerV1::GetCOG(Double_t signal[5])
577{
578 //
6d50f529 579 // Get COG position
580 // Used for clusters with more than 3 pads - where LUT not applicable
581 //
582
a6dd11e9 583 Double_t sum = signal[0]
584 + signal[1]
585 + signal[2]
586 + signal[3]
587 + signal[4];
588
589 Double_t res = (0.0 * (-signal[0] + signal[4])
590 + (-signal[1] + signal[3])) / sum;
6d50f529 591
7ad19338 592 return res;
6d50f529 593
7ad19338 594}
595
f7336fa3 596//_____________________________________________________________________________
a6dd11e9 597Double_t AliTRDclusterizerV1::Unfold(Double_t eps, Int_t plane, Double_t *padSignal)
f7336fa3 598{
599 //
600 // Method to unfold neighbouring maxima.
601 // The charge ratio on the overlapping pad is calculated
602 // until there is no more change within the range given by eps.
603 // The resulting ratio is then returned to the calling method.
604 //
605
a6dd11e9 606 AliTRDcalibDB *calibration = AliTRDcalibDB::Instance();
6d50f529 607 if (!calibration) {
608 AliError("No AliTRDcalibDB instance available\n");
6a739e92 609 return kFALSE;
3551db50 610 }
6a739e92 611
a5cadd36 612 Int_t irc = 0;
a6dd11e9 613 Int_t itStep = 0; // Count iteration steps
f7336fa3 614
a6dd11e9 615 Double_t ratio = 0.5; // Start value for ratio
616 Double_t prevRatio = 0.0; // Store previous ratio
f7336fa3 617
a6dd11e9 618 Double_t newLeftSignal[3] = { 0.0, 0.0, 0.0 }; // Array to store left cluster signal
619 Double_t newRightSignal[3] = { 0.0, 0.0, 0.0 }; // Array to store right cluster signal
620 Double_t newSignal[3] = { 0.0, 0.0, 0.0 };
f7336fa3 621
3e1a3ad8 622 // Start the iteration
f7336fa3 623 while ((TMath::Abs(prevRatio - ratio) > eps) && (itStep < 10)) {
624
625 itStep++;
626 prevRatio = ratio;
627
3e1a3ad8 628 // Cluster position according to charge ratio
a5cadd36 629 Double_t maxLeft = (ratio*padSignal[2] - padSignal[0])
630 / (padSignal[0] + padSignal[1] + ratio*padSignal[2]);
631 Double_t maxRight = (padSignal[4] - (1-ratio)*padSignal[2])
a6dd11e9 632 / ((1.0 - ratio)*padSignal[2] + padSignal[3] + padSignal[4]);
f7336fa3 633
3e1a3ad8 634 // Set cluster charge ratio
6a739e92 635 irc = calibration->PadResponse(1.0,maxLeft ,plane,newSignal);
a5cadd36 636 Double_t ampLeft = padSignal[1] / newSignal[1];
6a739e92 637 irc = calibration->PadResponse(1.0,maxRight,plane,newSignal);
a5cadd36 638 Double_t ampRight = padSignal[3] / newSignal[1];
f7336fa3 639
3e1a3ad8 640 // Apply pad response to parameters
6a739e92 641 irc = calibration->PadResponse(ampLeft ,maxLeft ,plane,newLeftSignal );
642 irc = calibration->PadResponse(ampRight,maxRight,plane,newRightSignal);
f7336fa3 643
3e1a3ad8 644 // Calculate new overlapping ratio
a5cadd36 645 ratio = TMath::Min((Double_t)1.0,newLeftSignal[2] /
a6dd11e9 646 (newLeftSignal[2] + newRightSignal[0]));
f7336fa3 647
648 }
649
650 return ratio;
651
652}
653
3becff3c 654//_____________________________________________________________________________
a6dd11e9 655void AliTRDclusterizerV1::Transform(AliTRDdataArrayI *digitsIn
656 , AliTRDdataArrayF *digitsOut
657 , Int_t idet, Int_t nRowMax
658 , Int_t nColMax, Int_t nTimeTotal
659 , Float_t ADCthreshold)
3becff3c 660{
3becff3c 661 //
cb86ff6e 662 // Apply gain factor
a6dd11e9 663 // Apply tail cancelation: Transform digitsIn to digitsOut
3becff3c 664 //
665
6d50f529 666 Int_t iRow = 0;
667 Int_t iCol = 0;
668 Int_t iTime = 0;
3becff3c 669
a6dd11e9 670 AliTRDRecParam *recParam = AliTRDRecParam::Instance();
6d50f529 671 if (!recParam) {
672 AliError("No AliTRDRecParam instance available\n");
3becff3c 673 return;
674 }
a6dd11e9 675 AliTRDcalibDB *calibration = AliTRDcalibDB::Instance();
6d50f529 676 if (!calibration) {
677 AliError("No AliTRDcalibDB instance available\n");
678 return;
679 }
11dc3a9e 680
a6dd11e9 681 Double_t *inADC = new Double_t[nTimeTotal]; // ADC data before tail cancellation
682 Double_t *outADC = new Double_t[nTimeTotal]; // ADC data after tail cancellation
3becff3c 683
6d50f529 684 AliDebug(1,Form("Tail cancellation (nExp = %d) for detector %d.\n"
685 ,recParam->GetTCnexp(),idet));
686
687 for (iRow = 0; iRow < nRowMax; iRow++ ) {
688 for (iCol = 0; iCol < nColMax; iCol++ ) {
a6dd11e9 689
6d50f529 690 for (iTime = 0; iTime < nTimeTotal; iTime++) {
3becff3c 691
cb86ff6e 692 //
6d50f529 693 // Add gain
cb86ff6e 694 //
6d50f529 695 Double_t gain = calibration->GetGainFactor(idet,iCol,iRow);
a6dd11e9 696 if (gain == 0.0) {
cb86ff6e 697 AliError("Not a valid gain\n");
698 }
a6dd11e9 699 inADC[iTime] = digitsIn->GetDataUnchecked(iRow,iCol,iTime);
700 inADC[iTime] /= gain;
701 outADC[iTime] = inADC[iTime];
6d50f529 702
3becff3c 703 }
704
705 // Apply the tail cancelation via the digital filter
6d50f529 706 if (recParam->TCOn()) {
a305677e 707 DeConvExp(inADC,outADC,nTimeTotal,recParam->GetTCnexp());
3becff3c 708 }
709
6d50f529 710 for (iTime = 0; iTime < nTimeTotal; iTime++) {
711
3becff3c 712 // Store the amplitude of the digit if above threshold
a305677e 713 if (outADC[iTime] > ADCthreshold) {
11dc3a9e 714 digitsOut->SetDataUnchecked(iRow,iCol,iTime,outADC[iTime]);
3becff3c 715 }
716
717 }
718
719 }
3becff3c 720 }
721
722 delete [] inADC;
723 delete [] outADC;
724
725 return;
726
727}
728
3becff3c 729//_____________________________________________________________________________
a6dd11e9 730void AliTRDclusterizerV1::DeConvExp(Double_t *source, Double_t *target
731 , Int_t n, Int_t nexp)
3becff3c 732{
733 //
6d50f529 734 // Tail cancellation by deconvolution for PASA v4 TRF
3becff3c 735 //
736
737 Double_t rates[2];
738 Double_t coefficients[2];
739
6d50f529 740 // Initialization (coefficient = alpha, rates = lambda)
3becff3c 741 Double_t R1 = 1.0;
742 Double_t R2 = 1.0;
743 Double_t C1 = 0.5;
744 Double_t C2 = 0.5;
745
746 if (nexp == 1) { // 1 Exponentials
747 R1 = 1.156;
748 R2 = 0.130;
749 C1 = 0.066;
750 C2 = 0.000;
751 }
752 if (nexp == 2) { // 2 Exponentials
753 R1 = 1.156;
754 R2 = 0.130;
755 C1 = 0.114;
756 C2 = 0.624;
757 }
758
759 coefficients[0] = C1;
760 coefficients[1] = C2;
761
a6dd11e9 762 Double_t Dt = 0.1;
3becff3c 763
764 rates[0] = TMath::Exp(-Dt/(R1));
765 rates[1] = TMath::Exp(-Dt/(R2));
766
6d50f529 767 Int_t i = 0;
768 Int_t k = 0;
3becff3c 769
6d50f529 770 Double_t reminder[2];
771 Double_t correction;
772 Double_t result;
3becff3c 773
6d50f529 774 // Attention: computation order is important
775 correction = 0.0;
776 for (k = 0; k < nexp; k++) {
777 reminder[k] = 0.0;
778 }
779 for (i = 0; i < n; i++) {
a6dd11e9 780 result = (source[i] - correction); // No rescaling
3becff3c 781 target[i] = result;
782
6d50f529 783 for (k = 0; k < nexp; k++) {
784 reminder[k] = rates[k] * (reminder[k] + coefficients[k] * result);
785 }
786 correction = 0.0;
787 for (k = 0; k < nexp; k++) {
788 correction += reminder[k];
789 }
3becff3c 790 }
791
792}