2 /**************************************************************************
3 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
5 * Author: The ALICE Off-line Project. *
6 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
19 ///////////////////////////////////////////////////////////////////////////////
21 // TRD cluster finder //
23 ///////////////////////////////////////////////////////////////////////////////
30 #include "AliRunLoader.h"
31 #include "AliLoader.h"
32 #include "AliRawReader.h"
35 #include "AliTRDclusterizerV1.h"
36 #include "AliTRDgeometry.h"
37 #include "AliTRDdataArrayF.h"
38 #include "AliTRDdataArrayI.h"
39 #include "AliTRDdigitsManager.h"
40 #include "AliTRDpadPlane.h"
41 #include "AliTRDrawData.h"
42 #include "AliTRDcalibDB.h"
43 #include "AliTRDSimParam.h"
44 #include "AliTRDRecParam.h"
45 #include "AliTRDCommonParam.h"
46 #include "AliTRDcluster.h"
48 #include "Cal/AliTRDCalROC.h"
49 #include "Cal/AliTRDCalDet.h"
51 ClassImp(AliTRDclusterizerV1)
53 //_____________________________________________________________________________
54 AliTRDclusterizerV1::AliTRDclusterizerV1()
59 // AliTRDclusterizerV1 default constructor
64 //_____________________________________________________________________________
65 AliTRDclusterizerV1::AliTRDclusterizerV1(const Text_t *name, const Text_t *title)
66 :AliTRDclusterizer(name,title)
67 ,fDigitsManager(new AliTRDdigitsManager())
70 // AliTRDclusterizerV1 constructor
73 fDigitsManager->CreateArrays();
77 //_____________________________________________________________________________
78 AliTRDclusterizerV1::AliTRDclusterizerV1(const AliTRDclusterizerV1 &c)
83 // AliTRDclusterizerV1 copy constructor
88 //_____________________________________________________________________________
89 AliTRDclusterizerV1::~AliTRDclusterizerV1()
92 // AliTRDclusterizerV1 destructor
96 delete fDigitsManager;
97 fDigitsManager = NULL;
102 //_____________________________________________________________________________
103 AliTRDclusterizerV1 &AliTRDclusterizerV1::operator=(const AliTRDclusterizerV1 &c)
106 // Assignment operator
109 if (this != &c) ((AliTRDclusterizerV1 &) c).Copy(*this);
114 //_____________________________________________________________________________
115 void AliTRDclusterizerV1::Copy(TObject &c) const
121 ((AliTRDclusterizerV1 &) c).fDigitsManager = 0;
123 AliTRDclusterizer::Copy(c);
127 //_____________________________________________________________________________
128 Bool_t AliTRDclusterizerV1::ReadDigits()
131 // Reads the digits arrays from the input aliroot file
135 AliError("No run loader available");
139 AliLoader* loader = fRunLoader->GetLoader("TRDLoader");
140 if (!loader->TreeD()) {
141 loader->LoadDigits();
144 // Read in the digit arrays
145 return (fDigitsManager->ReadDigits(loader->TreeD()));
149 //_____________________________________________________________________________
150 Bool_t AliTRDclusterizerV1::ReadDigits(AliRawReader *rawReader)
153 // Reads the digits arrays from the ddl file
157 fDigitsManager = raw.Raw2Digits(rawReader);
163 //_____________________________________________________________________________
164 Bool_t AliTRDclusterizerV1::MakeClusters()
167 // Generates the cluster.
178 AliTRDdataArrayI *digitsIn;
179 AliTRDdataArrayI *tracksIn;
182 AliTRDgeometry *geo = AliTRDgeometry::GetGeometry(fRunLoader);
184 AliWarning("Loading default TRD geometry!");
185 geo = new AliTRDgeometry();
188 AliTRDcalibDB *calibration = AliTRDcalibDB::Instance();
190 AliFatal("No AliTRDcalibDB instance available\n");
194 AliTRDSimParam *simParam = AliTRDSimParam::Instance();
196 AliError("No AliTRDSimParam instance available\n");
200 AliTRDRecParam *recParam = AliTRDRecParam::Instance();
202 AliError("No AliTRDRecParam instance available\n");
206 AliTRDCommonParam *commonParam = AliTRDCommonParam::Instance();
208 AliError("Could not get common parameters\n");
213 Float_t ADCthreshold = simParam->GetADCthreshold();
214 // Threshold value for the maximum
215 Float_t maxThresh = recParam->GetClusMaxThresh();
216 // Threshold value for the digit signal
217 Float_t sigThresh = recParam->GetClusSigThresh();
219 // Detector wise calibration object for t0
220 const AliTRDCalDet *calT0Det = calibration->GetT0Det();
221 // Detector wise calibration object for the gain factors
222 const AliTRDCalDet *calGainFactorDet = calibration->GetGainFactorDet();
224 // Iteration limit for unfolding procedure
225 const Float_t kEpsilon = 0.01;
226 const Int_t kNclus = 3;
227 const Int_t kNsig = 5;
228 const Int_t kNdict = AliTRDdigitsManager::kNDict;
229 const Int_t kNtrack = kNdict * kNclus;
233 Double_t ratioLeft = 1.0;
234 Double_t ratioRight = 1.0;
236 Int_t iClusterROC = 0;
238 Double_t padSignal[kNsig];
239 Double_t clusterSignal[kNclus];
240 Double_t clusterPads[kNclus];
243 Int_t chamEnd = AliTRDgeometry::Ncham();
245 Int_t planEnd = AliTRDgeometry::Nplan();
247 Int_t sectEnd = AliTRDgeometry::Nsect();
248 Int_t nTimeTotal = calibration->GetNumberOfTimeBins();
250 Int_t dummy[9] = { 0, 0, 0, 0, 0, 0, 0, 0, 0 };
252 AliDebug(1,Form("Number of Time Bins = %d.\n",nTimeTotal));
254 // Start clustering in every chamber
255 for (icham = chamBeg; icham < chamEnd; icham++) {
256 for (iplan = planBeg; iplan < planEnd; iplan++) {
257 for (isect = sectBeg; isect < sectEnd; isect++) {
259 Int_t idet = geo->GetDetector(iplan,icham,isect);
262 digitsIn = fDigitsManager->GetDigits(idet);
263 // This is to take care of switched off super modules
264 if (digitsIn->GetNtime() == 0) {
268 AliTRDdataArrayI *tracksTmp = fDigitsManager->GetDictionary(idet,0);
271 Int_t nRowMax = commonParam->GetRowMax(iplan,icham,isect);
272 Int_t nColMax = commonParam->GetColMax(iplan);
274 AliTRDpadPlane *padPlane = commonParam->GetPadPlane(iplan,icham);
276 // Calibration object with pad wise values for t0
277 AliTRDCalROC *calT0ROC = calibration->GetT0ROC(idet);
278 // Calibration object with pad wise values for the gain factors
279 AliTRDCalROC *calGainFactorROC = calibration->GetGainFactorROC(idet);
280 // Calibration value for chamber wise t0
281 Float_t calT0DetValue = calT0Det->GetValue(idet);
282 // Calibration value for chamber wise gain factor
283 Float_t calGainFactorDetValue = calGainFactorDet->GetValue(idet);
286 Int_t nClusters2pad = 0;
287 Int_t nClusters3pad = 0;
288 Int_t nClusters4pad = 0;
289 Int_t nClusters5pad = 0;
290 Int_t nClustersLarge = 0;
292 // Apply the gain and the tail cancelation via digital filter
293 AliTRDdataArrayF *digitsOut = new AliTRDdataArrayF(digitsIn->GetNrow()
295 ,digitsIn->GetNtime());
298 ,nRowMax,nColMax,nTimeTotal
301 ,calGainFactorDetValue);
303 // Input digits are not needed any more
304 digitsIn->Compress(1,0);
306 // Loop through the chamber and find the maxima
307 for ( row = 0; row < nRowMax; row++) {
308 for ( col = 2; col < nColMax; col++) {
309 for (time = 0; time < nTimeTotal; time++) {
311 Float_t signalM = TMath::Abs(digitsOut->GetDataUnchecked(row,col-1,time));
313 // Look for the maximum
314 if (signalM >= maxThresh) {
316 Float_t signalL = TMath::Abs(digitsOut->GetDataUnchecked(row,col ,time));
317 Float_t signalR = TMath::Abs(digitsOut->GetDataUnchecked(row,col-2,time));
319 if ((TMath::Abs(signalL) <= signalM) &&
320 (TMath::Abs(signalR) < signalM)) {
321 if ((TMath::Abs(signalL) >= sigThresh) ||
322 (TMath::Abs(signalR) >= sigThresh)) {
323 // Maximum found, mark the position by a negative signal
324 digitsOut->SetDataUnchecked(row,col-1,time,-signalM);
333 tracksTmp->Compress(1,0);
335 // The index to the first cluster of a given ROC
336 Int_t firstClusterROC = -1;
337 // The number of cluster in a given ROC
338 Int_t nClusterROC = 0;
340 // Now check the maxima and calculate the cluster position
341 for ( row = 0; row < nRowMax ; row++) {
342 for (time = 0; time < nTimeTotal; time++) {
343 for ( col = 1; col < nColMax-1; col++) {
346 if (digitsOut->GetDataUnchecked(row,col,time) < 0.0) {
348 for (iPad = 0; iPad < kNclus; iPad++) {
349 Int_t iPadCol = col - 1 + iPad;
350 clusterSignal[iPad] =
351 TMath::Abs(digitsOut->GetDataUnchecked(row,iPadCol,time));
354 // Count the number of pads in the cluster
359 while (TMath::Abs(digitsOut->GetDataUnchecked(row,col-ii ,time)) >= sigThresh) {
362 if (col-ii < 0) break;
366 while (TMath::Abs(digitsOut->GetDataUnchecked(row,col+ii+1,time)) >= sigThresh) {
369 if (col+ii+1 >= nColMax) break;
395 // Look for 5 pad cluster with minimum in the middle
396 Bool_t fivePadCluster = kFALSE;
397 if (col < (nColMax - 3)) {
398 if (digitsOut->GetDataUnchecked(row,col+2,time) < 0) {
399 fivePadCluster = kTRUE;
401 if ((fivePadCluster) && (col < (nColMax - 5))) {
402 if (digitsOut->GetDataUnchecked(row,col+4,time) >= sigThresh) {
403 fivePadCluster = kFALSE;
406 if ((fivePadCluster) && (col > 1)) {
407 if (digitsOut->GetDataUnchecked(row,col-2,time) >= sigThresh) {
408 fivePadCluster = kFALSE;
414 // Modify the signal of the overlapping pad for the left part
415 // of the cluster which remains from a previous unfolding
417 clusterSignal[0] *= ratioLeft;
422 // Unfold the 5 pad cluster
423 if (fivePadCluster) {
424 for (iPad = 0; iPad < kNsig; iPad++) {
425 padSignal[iPad] = TMath::Abs(digitsOut->GetDataUnchecked(row
429 // Unfold the two maxima and set the signal on
430 // the overlapping pad to the ratio
431 ratioRight = Unfold(kEpsilon,iplan,padSignal);
432 ratioLeft = 1.0 - ratioRight;
433 clusterSignal[2] *= ratioRight;
438 Double_t clusterCharge = clusterSignal[0]
442 // The position of the cluster
443 clusterPads[0] = row + 0.5;
444 // Take the shift of the additional time bins into account
445 clusterPads[2] = time + 0.5;
447 if (recParam->LUTOn()) {
448 // Calculate the position of the cluster by using the
449 // lookup table method
450 clusterPads[1] = recParam->LUTposition(iplan,clusterSignal[0]
455 // Calculate the position of the cluster by using the
456 // center of gravity method
457 for (Int_t i = 0; i < kNsig; i++) {
460 padSignal[2] = TMath::Abs(digitsOut->GetDataUnchecked(row,col ,time)); // Central pad
461 padSignal[1] = TMath::Abs(digitsOut->GetDataUnchecked(row,col-1,time)); // Left pad
462 padSignal[3] = TMath::Abs(digitsOut->GetDataUnchecked(row,col+1,time)); // Right pad
464 (TMath::Abs(digitsOut->GetDataUnchecked(row,col-2,time)) < padSignal[1])) {
465 padSignal[0] = TMath::Abs(digitsOut->GetDataUnchecked(row,col-2,time));
467 if ((col < nColMax - 3) &&
468 (TMath::Abs(digitsOut->GetDataUnchecked(row,col+2,time)) < padSignal[3])) {
469 padSignal[4] = TMath::Abs(digitsOut->GetDataUnchecked(row,col+2,time));
471 clusterPads[1] = GetCOG(padSignal);
474 Double_t q0 = clusterSignal[0];
475 Double_t q1 = clusterSignal[1];
476 Double_t q2 = clusterSignal[2];
477 Double_t clusterSigmaY2 = (q1 * (q0 + q2) + 4.0 * q0 * q2)
478 / (clusterCharge*clusterCharge);
481 // Calculate the position and the error
484 // Correct for t0 (sum of chamber and pad wise values !!!)
485 Float_t calT0ROCValue = calT0ROC->GetValue(col,row);
486 Int_t clusterTimeBin = TMath::Nint(time - (calT0DetValue + calT0ROCValue));
487 Double_t colSize = padPlane->GetColSize(col);
488 Double_t rowSize = padPlane->GetRowSize(row);
490 Double_t clusterPos[3];
491 clusterPos[0] = padPlane->GetColPos(col) - (clusterPads[1] + 0.5) * colSize;
492 clusterPos[1] = padPlane->GetRowPos(row) - 0.5 * rowSize;
493 clusterPos[2] = CalcXposFromTimebin(clusterPads[2],idet,col,row);
494 Double_t clusterSig[2];
495 clusterSig[0] = (clusterSigmaY2 + 1.0/12.0) * colSize*colSize;
496 clusterSig[1] = rowSize * rowSize / 12.0;
498 // Add the cluster to the output array
499 // The track indices will be stored later
500 AliTRDcluster *cluster = AddCluster(clusterPos
509 // Store the amplitudes of the pads in the cluster for later analysis
510 Short_t signals[7] = { 0, 0, 0, 0, 0, 0, 0 };
511 for (Int_t jPad = col-3; jPad <= col+3; jPad++) {
513 (jPad >= nColMax-1)) {
516 signals[jPad-col+3] = TMath::Nint(TMath::Abs(digitsOut->GetDataUnchecked(row,jPad,time)));
518 cluster->SetSignals(signals);
520 // Temporarily store the row, column and time bin of the center pad
521 // Used to later on assign the track indices
522 cluster->SetLabel( row,0);
523 cluster->SetLabel( col,1);
524 cluster->SetLabel(time,2);
526 // Store the index of the first cluster in the current ROC
527 if (firstClusterROC < 0) {
528 firstClusterROC = RecPoints()->GetEntriesFast() - 1;
530 // Count the number of cluster in the current ROC
533 } // if: Maximum found ?
535 } // loop: pad columns
542 // Add the track indices to the found clusters
545 // Temporary array to collect the track indices
546 Int_t *idxTracks = new Int_t[kNtrack*nClusterROC];
548 // Loop through the dictionary arrays one-by-one
549 // to keep memory consumption low
550 for (Int_t iDict = 0; iDict < kNdict; iDict++) {
552 tracksIn = fDigitsManager->GetDictionary(idet,iDict);
555 // Loop though the clusters found in this ROC
556 for (iClusterROC = 0; iClusterROC < nClusterROC; iClusterROC++) {
558 AliTRDcluster *cluster = (AliTRDcluster *)
559 RecPoints()->UncheckedAt(firstClusterROC+iClusterROC);
560 row = cluster->GetLabel(0);
561 col = cluster->GetLabel(1);
562 time = cluster->GetLabel(2);
564 for (iPad = 0; iPad < kNclus; iPad++) {
565 Int_t iPadCol = col - 1 + iPad;
566 Int_t index = tracksIn->GetDataUnchecked(row,iPadCol,time) - 1;
567 idxTracks[3*iPad+iDict + iClusterROC*kNtrack] = index;
572 // Compress the arrays
573 tracksIn->Compress(1,0);
577 // Copy the track indices into the cluster
578 // Loop though the clusters found in this ROC
579 for (iClusterROC = 0; iClusterROC < nClusterROC; iClusterROC++) {
581 AliTRDcluster *cluster = (AliTRDcluster *)
582 RecPoints()->UncheckedAt(firstClusterROC+iClusterROC);
583 cluster->SetLabel(-9999,0);
584 cluster->SetLabel(-9999,1);
585 cluster->SetLabel(-9999,2);
587 cluster->AddTrackIndex(&idxTracks[iClusterROC*kNtrack]);
593 // Write the cluster and reset the array
605 //_____________________________________________________________________________
606 Double_t AliTRDclusterizerV1::GetCOG(Double_t signal[5])
610 // Used for clusters with more than 3 pads - where LUT not applicable
613 Double_t sum = signal[0]
619 Double_t res = (0.0 * (-signal[0] + signal[4])
620 + (-signal[1] + signal[3])) / sum;
626 //_____________________________________________________________________________
627 Double_t AliTRDclusterizerV1::Unfold(Double_t eps, Int_t plane, Double_t *padSignal)
630 // Method to unfold neighbouring maxima.
631 // The charge ratio on the overlapping pad is calculated
632 // until there is no more change within the range given by eps.
633 // The resulting ratio is then returned to the calling method.
636 AliTRDcalibDB *calibration = AliTRDcalibDB::Instance();
638 AliError("No AliTRDcalibDB instance available\n");
643 Int_t itStep = 0; // Count iteration steps
645 Double_t ratio = 0.5; // Start value for ratio
646 Double_t prevRatio = 0.0; // Store previous ratio
648 Double_t newLeftSignal[3] = { 0.0, 0.0, 0.0 }; // Array to store left cluster signal
649 Double_t newRightSignal[3] = { 0.0, 0.0, 0.0 }; // Array to store right cluster signal
650 Double_t newSignal[3] = { 0.0, 0.0, 0.0 };
652 // Start the iteration
653 while ((TMath::Abs(prevRatio - ratio) > eps) && (itStep < 10)) {
658 // Cluster position according to charge ratio
659 Double_t maxLeft = (ratio*padSignal[2] - padSignal[0])
660 / (padSignal[0] + padSignal[1] + ratio*padSignal[2]);
661 Double_t maxRight = (padSignal[4] - (1-ratio)*padSignal[2])
662 / ((1.0 - ratio)*padSignal[2] + padSignal[3] + padSignal[4]);
664 // Set cluster charge ratio
665 irc = calibration->PadResponse(1.0,maxLeft ,plane,newSignal);
666 Double_t ampLeft = padSignal[1] / newSignal[1];
667 irc = calibration->PadResponse(1.0,maxRight,plane,newSignal);
668 Double_t ampRight = padSignal[3] / newSignal[1];
670 // Apply pad response to parameters
671 irc = calibration->PadResponse(ampLeft ,maxLeft ,plane,newLeftSignal );
672 irc = calibration->PadResponse(ampRight,maxRight,plane,newRightSignal);
674 // Calculate new overlapping ratio
675 ratio = TMath::Min((Double_t)1.0,newLeftSignal[2] /
676 (newLeftSignal[2] + newRightSignal[0]));
684 //_____________________________________________________________________________
685 void AliTRDclusterizerV1::Transform(AliTRDdataArrayI *digitsIn
686 , AliTRDdataArrayF *digitsOut
687 , Int_t nRowMax, Int_t nColMax, Int_t nTimeTotal
688 , Float_t ADCthreshold
689 , AliTRDCalROC *calGainFactorROC
690 , Float_t calGainFactorDetValue)
694 // Apply tail cancelation: Transform digitsIn to digitsOut
701 AliTRDRecParam *recParam = AliTRDRecParam::Instance();
703 AliError("No AliTRDRecParam instance available\n");
707 Double_t *inADC = new Double_t[nTimeTotal]; // ADC data before tail cancellation
708 Double_t *outADC = new Double_t[nTimeTotal]; // ADC data after tail cancellation
710 for (iRow = 0; iRow < nRowMax; iRow++ ) {
711 for (iCol = 0; iCol < nColMax; iCol++ ) {
713 Float_t calGainFactorROCValue = calGainFactorROC->GetValue(iCol,iRow);
714 Double_t gain = calGainFactorDetValue
715 * calGainFactorROCValue;
717 for (iTime = 0; iTime < nTimeTotal; iTime++) {
722 inADC[iTime] = digitsIn->GetDataUnchecked(iRow,iCol,iTime);
723 inADC[iTime] /= gain;
724 outADC[iTime] = inADC[iTime];
728 // Apply the tail cancelation via the digital filter
729 if (recParam->TCOn()) {
730 DeConvExp(inADC,outADC,nTimeTotal,recParam->GetTCnexp());
733 for (iTime = 0; iTime < nTimeTotal; iTime++) {
735 // Store the amplitude of the digit if above threshold
736 if (outADC[iTime] > ADCthreshold) {
737 digitsOut->SetDataUnchecked(iRow,iCol,iTime,outADC[iTime]);
752 //_____________________________________________________________________________
753 void AliTRDclusterizerV1::DeConvExp(Double_t *source, Double_t *target
754 , Int_t n, Int_t nexp)
757 // Tail cancellation by deconvolution for PASA v4 TRF
761 Double_t coefficients[2];
763 // Initialization (coefficient = alpha, rates = lambda)
769 if (nexp == 1) { // 1 Exponentials
775 if (nexp == 2) { // 2 Exponentials
782 coefficients[0] = C1;
783 coefficients[1] = C2;
787 rates[0] = TMath::Exp(-Dt/(R1));
788 rates[1] = TMath::Exp(-Dt/(R2));
793 Double_t reminder[2];
797 // Attention: computation order is important
799 for (k = 0; k < nexp; k++) {
802 for (i = 0; i < n; i++) {
803 result = (source[i] - correction); // No rescaling
806 for (k = 0; k < nexp; k++) {
807 reminder[k] = rates[k] * (reminder[k] + coefficients[k] * result);
810 for (k = 0; k < nexp; k++) {
811 correction += reminder[k];