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 **************************************************************************/
18 ///////////////////////////////////////////////////////////////////////////////
20 // Creates and handles digits from TRD hits //
21 // Author: C. Blume (C.Blume@gsi.de) //
23 // The following effects are included: //
26 // - Gas gain including fluctuations //
27 // - Pad-response (simple Gaussian approximation) //
29 // - Electronics noise //
30 // - Electronics gain //
33 // The corresponding parameter can be adjusted via the various //
34 // Set-functions. If these parameters are not explicitly set, default //
35 // values are used (see Init-function). //
36 // As an example on how to use this class to produce digits from hits //
37 // have a look at the macro hits2digits.C //
38 // The production of summable digits is demonstrated in hits2sdigits.C //
39 // and the subsequent conversion of the s-digits into normal digits is //
40 // explained in sdigits2digits.C. //
42 ///////////////////////////////////////////////////////////////////////////////
57 #include "AliRunLoader.h"
58 #include "AliLoader.h"
59 #include "AliConfig.h"
61 #include "AliRunDigitizer.h"
62 #include "AliRunLoader.h"
63 #include "AliLoader.h"
66 #include "AliTRDhit.h"
67 #include "AliTRDdigitizer.h"
68 #include "AliTRDdataArrayI.h"
69 #include "AliTRDdataArrayF.h"
70 #include "AliTRDsegmentArray.h"
71 #include "AliTRDdigitsManager.h"
72 #include "AliTRDgeometry.h"
73 #include "AliTRDparameter.h"
75 ClassImp(AliTRDdigitizer)
77 //_____________________________________________________________________________
78 AliTRDdigitizer::AliTRDdigitizer()
81 // AliTRDdigitizer default constructor
87 fSDigitsManagerList = 0;
97 fMergeSignalOnly = kFALSE;
103 //_____________________________________________________________________________
104 AliTRDdigitizer::AliTRDdigitizer(const Text_t *name, const Text_t *title)
105 :AliDigitizer(name,title)
108 // AliTRDdigitizer constructor
113 //NewIO: These data members probably are not needed anymore
116 fSDigitsManagerList = 0;
126 fSDigitsScale = 100.; // For the summable digits
127 fMergeSignalOnly = kFALSE;
134 //_____________________________________________________________________________
135 AliTRDdigitizer::AliTRDdigitizer(AliRunDigitizer *manager
136 , const Text_t *name, const Text_t *title)
137 :AliDigitizer(manager,name,title)
140 // AliTRDdigitizer constructor
146 fSDigitsManagerList = 0;
155 fSDigitsScale = 100.; // For the summable digits
156 fMergeSignalOnly = kFALSE;
163 //_____________________________________________________________________________
164 AliTRDdigitizer::AliTRDdigitizer(AliRunDigitizer *manager)
165 :AliDigitizer(manager,"AliTRDdigitizer","TRD digitizer")
168 // AliTRDdigitizer constructor
175 fSDigitsManagerList = 0;
184 fSDigitsScale = 100.; // For the summable digits
185 fMergeSignalOnly = kFALSE;
192 //_____________________________________________________________________________
193 AliTRDdigitizer::AliTRDdigitizer(const AliTRDdigitizer &d):AliDigitizer(d)
196 // AliTRDdigitizer copy constructor
199 ((AliTRDdigitizer &) d).Copy(*this);
203 //_____________________________________________________________________________
204 AliTRDdigitizer::~AliTRDdigitizer()
207 // AliTRDdigitizer destructor
211 if (fDigitsManager) {
212 delete fDigitsManager;
218 if (fSDigitsManagerList) {
219 fSDigitsManagerList->Delete();
220 delete fSDigitsManagerList;
221 fSDigitsManagerList = 0;
231 //_____________________________________________________________________________
232 AliTRDdigitizer &AliTRDdigitizer::operator=(const AliTRDdigitizer &d)
235 // Assignment operator
238 if (this != &d) ((AliTRDdigitizer &) d).Copy(*this);
243 //_____________________________________________________________________________
244 void AliTRDdigitizer::Copy(TObject &d)
250 ((AliTRDdigitizer &) d).fRunLoader = 0;
251 ((AliTRDdigitizer &) d).fDigitsManager = 0;
252 ((AliTRDdigitizer &) d).fSDigitsManager = 0;
253 ((AliTRDdigitizer &) d).fSDigitsManagerList = 0;
254 ((AliTRDdigitizer &) d).fTRD = 0;
255 ((AliTRDdigitizer &) d).fGeo = 0;
256 ((AliTRDdigitizer &) d).fPar = 0;
257 ((AliTRDdigitizer &) d).fEvent = 0;
258 ((AliTRDdigitizer &) d).fMasks = 0;
259 ((AliTRDdigitizer &) d).fCompress = fCompress;
260 ((AliTRDdigitizer &) d).fDebug = fDebug ;
261 ((AliTRDdigitizer &) d).fSDigits = fSDigits;
262 ((AliTRDdigitizer &) d).fSDigitsScale = fSDigitsScale;
263 ((AliTRDdigitizer &) d).fMergeSignalOnly = fMergeSignalOnly;
264 ((AliTRDdigitizer &) d).fSimpleSim = fSimpleSim;
265 ((AliTRDdigitizer &) d).fSimpleDet = fSimpleDet;
269 //_____________________________________________________________________________
270 void AliTRDdigitizer::Exec(Option_t* option)
273 // Executes the merging
278 AliTRDdigitsManager *sdigitsManager;
280 TString optionString = option;
281 if (optionString.Contains("deb")) {
283 if (optionString.Contains("2")) {
286 printf("<AliTRDdigitizer::Exec> ");
287 printf("Called with debug option %d\n",fDebug);
290 // The AliRoot file is already connected by the manager
296 printf("<AliTRDdigitizer::Exec> ");
297 printf("AliRun object found on file.\n");
301 inrl = AliRunLoader::GetRunLoader(fManager->GetInputFolderName(0));
303 gAlice = inrl->GetAliRun();
306 printf("<AliTRDdigitizer::Exec> ");
307 printf("Could not find AliRun object.\n");
312 Int_t nInput = fManager->GetNinputs();
313 fMasks = new Int_t[nInput];
314 for (iInput = 0; iInput < nInput; iInput++) {
315 fMasks[iInput] = fManager->GetMask(iInput);
320 AliRunLoader* orl = AliRunLoader::GetRunLoader(fManager->GetOutputFolderName());
321 if (InitDetector()) {
322 AliLoader* ogime = orl->GetLoader("TRDLoader");
327 //if we produce SDigits
328 tree = ogime->TreeS();
331 ogime->MakeTree("S");
332 tree = ogime->TreeS();
336 {//if we produce Digits
337 tree = ogime->TreeD();
340 ogime->MakeTree("D");
341 tree = ogime->TreeD();
347 for (iInput = 0; iInput < nInput; iInput++) {
350 printf("<AliTRDdigitizer::Exec> ");
351 printf("Add input stream %d\n",iInput);
354 // check if the input tree exists
355 inrl = AliRunLoader::GetRunLoader(fManager->GetInputFolderName(iInput));
356 AliLoader* gime = inrl->GetLoader("TRDLoader");
358 TTree * treees = gime->TreeS();
361 if (gime->LoadSDigits())
363 Error("Exec","Error Occured while loading S. Digits for input %d.",iInput);
366 treees = gime->TreeS();
370 printf("<AliTRDdigitizer::Exec> ");
371 printf("Input stream %d does not exist\n",iInput);
375 // Read the s-digits via digits manager
376 sdigitsManager = new AliTRDdigitsManager();
377 sdigitsManager->SetDebug(fDebug);
378 sdigitsManager->SetSDigits(kTRUE);
380 AliRunLoader* rl = AliRunLoader::GetRunLoader(fManager->GetInputFolderName(iInput));
381 AliLoader* gimme = rl->GetLoader("TRDLoader");
382 if (!gimme->TreeS()) gimme->LoadSDigits();
383 sdigitsManager->ReadDigits(gimme->TreeS());
385 // Add the s-digits to the input list
386 AddSDigitsManager(sdigitsManager);
390 // Convert the s-digits to normal digits
392 printf("<AliTRDdigitizer::Exec> ");
393 printf("Do the conversion\n");
399 printf("<AliTRDdigitizer::Exec> ");
400 printf("Write the digits\n");
403 fDigitsManager->WriteDigits();
407 if (!gFile->Get("TRDparameter")) GetParameter()->Write();
410 printf("<AliTRDdigitizer::Exec> ");
414 DeleteSDigitsManager();
418 //_____________________________________________________________________________
419 Bool_t AliTRDdigitizer::Open(const Char_t *file, Int_t nEvent)
422 // Opens a ROOT-file with TRD-hits and reads in the hit-tree
425 // Connect the AliRoot file containing Geometry, Kine, and Hits
428 TString evfoldname = AliConfig::GetDefaultEventFolderName();
429 fRunLoader = AliRunLoader::GetRunLoader(evfoldname);
431 fRunLoader = AliRunLoader::Open(file,AliConfig::GetDefaultEventFolderName(),
436 Error("Open","Can not open session for file %s.",file);
440 if (!fRunLoader->GetAliRun()) fRunLoader->LoadgAlice();
441 gAlice = fRunLoader->GetAliRun();
445 printf("<AliTRDdigitizer::Open> ");
446 printf("AliRun object found on file.\n");
450 printf("<AliTRDdigitizer::Open> ");
451 printf("Could not find AliRun object.\n");
457 // Import the Trees for the event nEvent in the file
458 fRunLoader->GetEvent(fEvent);
460 AliLoader* loader = fRunLoader->GetLoader("TRDLoader");
463 Error("Open","Can not get TRD loader from Run Loader");
467 if (InitDetector()) {
471 //if we produce SDigits
472 tree = loader->TreeS();
475 loader->MakeTree("S");
476 tree = loader->TreeS();
480 {//if we produce Digits
481 tree = loader->TreeD();
484 loader->MakeTree("D");
485 tree = loader->TreeD();
488 return MakeBranch(tree);
496 //_____________________________________________________________________________
497 Bool_t AliTRDdigitizer::InitDetector()
500 // Sets the pointer to the TRD detector and the geometry
503 // Get the pointer to the detector class and check for version 1
504 fTRD = (AliTRD *) gAlice->GetDetector("TRD");
506 printf("<AliTRDdigitizer::InitDetector> ");
507 printf("No TRD module found\n");
510 if (fTRD->IsVersion() != 1) {
511 printf("<AliTRDdigitizer::InitDetector> ");
512 printf("TRD must be version 1 (slow simulator).\n");
517 fGeo = fTRD->GetGeometry();
519 printf("<AliTRDdigitizer::InitDetector> ");
520 printf("Geometry version %d\n",fGeo->IsVersion());
523 // Create a digits manager
524 delete fDigitsManager;
525 fDigitsManager = new AliTRDdigitsManager();
526 fDigitsManager->SetSDigits(fSDigits);
527 fDigitsManager->CreateArrays();
528 fDigitsManager->SetEvent(fEvent);
529 fDigitsManager->SetDebug(fDebug);
531 // The list for the input s-digits manager to be merged
532 if (fSDigitsManagerList) {
533 fSDigitsManagerList->Delete();
535 fSDigitsManagerList = new TList();
542 //_____________________________________________________________________________
543 Bool_t AliTRDdigitizer::MakeBranch(TTree* tree) const
546 // Create the branches for the digits array
549 return fDigitsManager->MakeBranch(tree);
553 //_____________________________________________________________________________
554 Bool_t AliTRDdigitizer::MakeDigits()
560 ///////////////////////////////////////////////////////////////
562 ///////////////////////////////////////////////////////////////
564 // Converts number of electrons to fC
565 const Double_t kEl2fC = 1.602E-19 * 1.0E15;
567 ///////////////////////////////////////////////////////////////
569 // Number of pads included in the pad response
570 const Int_t kNpad = 3;
572 // Number of track dictionary arrays
573 const Int_t kNDict = AliTRDdigitsManager::kNDict;
575 // Half the width of the amplification region
576 const Float_t kAmWidth = AliTRDgeometry::AmThick() / 2.;
578 Int_t iRow, iCol, iTime, iPad;
582 Int_t totalSizeDigits = 0;
583 Int_t totalSizeDict0 = 0;
584 Int_t totalSizeDict1 = 0;
585 Int_t totalSizeDict2 = 0;
587 Int_t timeTRDbeg = 0;
588 Int_t timeTRDend = 1;
593 Float_t padSignal[kNpad];
594 Float_t signalOld[kNpad];
596 AliTRDdataArrayF *signals = 0;
597 AliTRDdataArrayI *digits = 0;
598 AliTRDdataArrayI *dictionary[kNDict];
600 // Create a default parameter class if none is defined
602 fPar = new AliTRDparameter("TRDparameter","Standard TRD parameter");
604 printf("<AliTRDdigitizer::MakeDigits> ");
605 printf("Create the default parameter object\n");
609 // Create a container for the amplitudes
610 AliTRDsegmentArray *signalsArray
611 = new AliTRDsegmentArray("AliTRDdataArrayF"
612 ,AliTRDgeometry::Ndet());
615 timeTRDbeg = ((Int_t) (-fPar->GetTRFlo() / fPar->GetTimeBinSize())) - 1;
616 timeTRDend = ((Int_t) ( fPar->GetTRFhi() / fPar->GetTimeBinSize())) - 1;
618 printf("<AliTRDdigitizer::MakeDigits> ");
619 printf("Sample the TRF between -%d and %d\n",timeTRDbeg,timeTRDend);
623 Float_t elAttachProp = fPar->GetElAttachProp() / 100.;
626 printf("<AliTRDdigitizer::MakeDigits> ");
627 printf("No geometry defined\n");
632 printf("<AliTRDdigitizer::MakeDigits> ");
633 printf("Start creating digits.\n");
636 AliLoader* gimme = fRunLoader->GetLoader("TRDLoader");
637 if (!gimme->TreeH()) gimme->LoadHits();
638 TTree* hitTree = gimme->TreeH();
641 Error("MakeDigits","Can not get TreeH");
644 fTRD->SetTreeAddress();
646 // Get the number of entries in the hit tree
647 // (Number of primary particles creating a hit somewhere)
650 nTrack = (Int_t) hitTree->GetEntries();
652 printf("<AliTRDdigitizer::MakeDigits> ");
653 printf("Found %d primary particles\n",nTrack);
657 Int_t detectorOld = -1;
660 // Loop through all entries in the tree
661 for (Int_t iTrack = 0; iTrack < nTrack; iTrack++) {
665 nBytes += hitTree->GetEvent(iTrack);
668 // Loop through the TRD hits
670 AliTRDhit *hit = (AliTRDhit *) fTRD->FirstHit(-1);
679 Float_t q = hit->GetCharge();
680 Int_t track = hit->Track();
681 Int_t detector = hit->GetDetector();
682 Int_t plane = fGeo->GetPlane(detector);
683 Int_t sector = fGeo->GetSector(detector);
684 Int_t chamber = fGeo->GetChamber(detector);
685 Int_t nRowMax = fPar->GetRowMax(plane,chamber,sector);
686 Int_t nColMax = fPar->GetColMax(plane);
687 Int_t nTimeMax = fPar->GetTimeMax();
688 Int_t nTimeBefore = fPar->GetTimeBefore();
689 Int_t nTimeAfter = fPar->GetTimeAfter();
690 Int_t nTimeTotal = fPar->GetTimeTotal();
691 Float_t row0 = fPar->GetRow0(plane,chamber,sector);
692 Float_t col0 = fPar->GetCol0(plane);
693 Float_t time0 = fPar->GetTime0(plane);
694 Float_t rowPadSize = fPar->GetRowPadSize(plane,chamber,sector);
695 Float_t colPadSize = fPar->GetColPadSize(plane);
696 Float_t timeBinSize = fPar->GetTimeBinSize();
697 Float_t divideRow = 1.0 / rowPadSize;
698 Float_t divideCol = 1.0 / colPadSize;
699 Float_t divideTime = 1.0 / timeBinSize;
702 printf("Analyze hit no. %d ",iHit);
703 printf("-----------------------------------------------------------\n");
705 printf("plane = %d, sector = %d, chamber = %d\n"
706 ,plane,sector,chamber);
707 printf("nRowMax = %d, nColMax = %d, nTimeMax = %d\n"
708 ,nRowMax,nColMax,nTimeMax);
709 printf("nTimeBefore = %d, nTimeAfter = %d, nTimeTotal = %d\n"
710 ,nTimeBefore,nTimeAfter,nTimeTotal);
711 printf("row0 = %f, col0 = %f, time0 = %f\n"
713 printf("rowPadSize = %f, colPadSize = %f, timeBinSize = %f\n"
714 ,rowPadSize,colPadSize,timeBinSize);
717 // Don't analyze test hits and switched off detectors
718 if ((CheckDetector(plane,chamber,sector)) &&
719 (((Int_t) q) != 0)) {
721 if (detector != detectorOld) {
724 printf("<AliTRDdigitizer::MakeDigits> ");
725 printf("Get new container. New det = %d, Old det = %d\n"
726 ,detector,detectorOld);
728 // Compress the old one if enabled
729 if ((fCompress) && (detectorOld > -1)) {
731 printf("<AliTRDdigitizer::MakeDigits> ");
732 printf("Compress the old container ...");
734 signals->Compress(1,0);
735 for (iDict = 0; iDict < kNDict; iDict++) {
736 dictionary[iDict]->Compress(1,0);
738 if (fDebug > 1) printf("done\n");
740 // Get the new container
741 signals = (AliTRDdataArrayF *) signalsArray->At(detector);
742 if (signals->GetNtime() == 0) {
743 // Allocate a new one if not yet existing
745 printf("<AliTRDdigitizer::MakeDigits> ");
746 printf("Allocate a new container ... ");
748 signals->Allocate(nRowMax,nColMax,nTimeTotal);
750 else if (fSimpleSim) {
751 // Clear an old one for the simple simulation
753 printf("<AliTRDdigitizer::MakeDigits> ");
754 printf("Clear a old container ... ");
759 // Expand an existing one
762 printf("<AliTRDdigitizer::MakeDigits> ");
763 printf("Expand an existing container ... ");
768 // The same for the dictionary
770 for (iDict = 0; iDict < kNDict; iDict++) {
771 dictionary[iDict] = fDigitsManager->GetDictionary(detector,iDict);
772 if (dictionary[iDict]->GetNtime() == 0) {
773 dictionary[iDict]->Allocate(nRowMax,nColMax,nTimeTotal);
776 if (fCompress) dictionary[iDict]->Expand();
780 if (fDebug > 1) printf("done\n");
781 detectorOld = detector;
784 // Rotate the sectors on top of each other
791 fGeo->Rotate(detector,pos,rot);
794 // The driftlength. It is negative if the hit is in the
795 // amplification region.
796 Float_t driftlength = time0 - rot[0];
798 // Take also the drift in the amplification region into account
799 // The drift length is at the moment still the same, regardless of
800 // the position relativ to the wire. This non-isochronity needs still
801 // to be implemented.
802 Float_t driftlengthL = TMath::Abs(driftlength + kAmWidth);
803 if (fPar->ExBOn()) driftlengthL /= TMath::Sqrt(fPar->GetLorentzFactor());
805 // Loop over all electrons of this hit
806 // TR photons produce hits with negative charge
807 Int_t nEl = ((Int_t) TMath::Abs(q));
808 for (Int_t iEl = 0; iEl < nEl; iEl++) {
814 // Electron attachment
815 if (fPar->ElAttachOn()) {
816 if (gRandom->Rndm() < (driftlengthL * elAttachProp))
820 // Apply the diffusion smearing
821 if (fPar->DiffusionOn()) {
822 if (!(fPar->Diffusion(driftlengthL,xyz))) continue;
825 // Apply E x B effects (depends on drift direction)
827 if (!(fPar->ExB(driftlength+kAmWidth,xyz))) continue;
830 // The electron position after diffusion and ExB in pad coordinates
831 // The pad row (z-direction)
832 Float_t rowDist = xyz[2] - row0;
833 Int_t rowE = ((Int_t) (rowDist * divideRow));
834 if ((rowE < 0) || (rowE >= nRowMax)) continue;
835 Float_t rowOffset = ((((Float_t) rowE) + 0.5) * rowPadSize) - rowDist;
837 // The pad column (rphi-direction)
838 Float_t col0tilt = fPar->Col0Tilted(col0,rowOffset,plane);
839 Float_t colDist = xyz[1] - col0tilt;
840 Int_t colE = ((Int_t) (colDist * divideCol));
841 if ((colE < 0) || (colE >= nColMax)) continue;
842 Float_t colOffset = ((((Float_t) colE) + 0.5) * colPadSize) - colDist;
844 // The time bin (negative for hits in the amplification region)
845 // In the amplification region the electrons drift from both sides
846 // to the middle (anode wire plane)
847 Float_t timeDist = time0 - xyz[0];
848 Float_t timeOffset = 0;
852 timeE = ((Int_t) (timeDist * divideTime));
853 // The distance of the position to the middle of the timebin
854 timeOffset = ((((Float_t) timeE) + 0.5) * timeBinSize) - timeDist;
857 // Difference between half of the amplification gap width and
858 // the distance to the anode wire
859 Float_t anodeDist = kAmWidth - TMath::Abs(timeDist + kAmWidth);
861 timeE = -1 * (((Int_t ) (anodeDist * divideTime)) + 1);
862 // The distance of the position to the middle of the timebin
863 timeOffset = ((((Float_t) timeE) + 0.5) * timeBinSize) + anodeDist;
866 // Apply the gas gain including fluctuations
867 Float_t ggRndm = 0.0;
869 ggRndm = gRandom->Rndm();
870 } while (ggRndm <= 0);
871 Int_t signal = (Int_t) (-fPar->GetGasGain() * TMath::Log(ggRndm));
873 // Apply the pad response
875 // The distance of the electron to the center of the pad
876 // in units of pad width
877 Float_t dist = - colOffset * divideCol;
878 if (!(fPar->PadResponse(signal,dist,plane,padSignal))) continue;
882 padSignal[1] = signal;
886 // Sample the time response inside the drift region
887 // + additional time bins before and after.
888 // The sampling is done always in the middle of the time bin
889 for (Int_t iTimeBin = TMath::Max(timeE-timeTRDbeg, -nTimeBefore)
890 ;iTimeBin < TMath::Min(timeE+timeTRDend,nTimeMax+nTimeAfter )
893 // Apply the time response
894 Float_t timeResponse = 1.0;
895 Float_t crossTalk = 0.0;
896 Float_t time = (iTimeBin - timeE) * timeBinSize + timeOffset;
898 timeResponse = fPar->TimeResponse(time);
901 crossTalk = fPar->CrossTalk(time);
908 for (iPad = 0; iPad < kNpad; iPad++) {
910 Int_t colPos = colE + iPad - 1;
911 if (colPos < 0) continue;
912 if (colPos >= nColMax) break;
915 // Note: The time bin number is shifted by nTimeBefore to avoid negative
916 // time bins. This has to be subtracted later.
917 Int_t iCurrentTimeBin = iTimeBin + nTimeBefore;
918 signalOld[iPad] = signals->GetDataUnchecked(rowE,colPos,iCurrentTimeBin);
919 if( colPos != colE ) {
920 signalOld[iPad] += padSignal[iPad] * (timeResponse + crossTalk);
923 signalOld[iPad] += padSignal[iPad] * timeResponse;
925 signals->SetDataUnchecked(rowE,colPos,iCurrentTimeBin,signalOld[iPad]);
927 // Store the track index in the dictionary
928 // Note: We store index+1 in order to allow the array to be compressed
929 if ((signalOld[iPad] > 0) && (!fSimpleSim)) {
930 for (iDict = 0; iDict < kNDict; iDict++) {
931 Int_t oldTrack = dictionary[iDict]->GetDataUnchecked(rowE
934 if (oldTrack == track+1) break;
936 dictionary[iDict]->SetDataUnchecked(rowE,colPos,iCurrentTimeBin,track+1);
946 } // Loop: electrons of a single hit
948 } // If: detector and test hit
950 hit = (AliTRDhit *) fTRD->NextHit();
952 } // Loop: hits of one primary track
954 } // Loop: primary tracks
957 printf("<AliTRDdigitizer::MakeDigits> ");
958 printf("Finished analyzing %d hits\n",countHits);
961 // The coupling factor
962 Float_t coupling = fPar->GetPadCoupling()
963 * fPar->GetTimeCoupling();
965 // The conversion factor
966 Float_t convert = kEl2fC
967 * fPar->GetChipGain();
969 // Loop through all chambers to finalize the digits
971 Int_t iDetEnd = AliTRDgeometry::Ndet();
973 iDetBeg = fSimpleDet;
974 iDetEnd = iDetBeg + 1;
976 for (Int_t iDet = iDetBeg; iDet < iDetEnd; iDet++) {
978 Int_t plane = fGeo->GetPlane(iDet);
979 Int_t sector = fGeo->GetSector(iDet);
980 Int_t chamber = fGeo->GetChamber(iDet);
981 Int_t nRowMax = fPar->GetRowMax(plane,chamber,sector);
982 Int_t nColMax = fPar->GetColMax(plane);
983 Int_t nTimeMax = fPar->GetTimeMax();
984 Int_t nTimeTotal = fPar->GetTimeTotal();
986 Double_t *inADC = new Double_t[nTimeTotal];
987 Double_t *outADC = new Double_t[nTimeTotal];
990 printf("<AliTRDdigitizer::MakeDigits> ");
991 printf("Digitization for chamber %d\n",iDet);
994 // Add a container for the digits of this detector
995 digits = fDigitsManager->GetDigits(iDet);
996 // Allocate memory space for the digits buffer
997 if (digits->GetNtime() == 0) {
998 digits->Allocate(nRowMax,nColMax,nTimeTotal);
1000 else if (fSimpleSim) {
1004 // Get the signal container
1005 signals = (AliTRDdataArrayF *) signalsArray->At(iDet);
1006 if (signals->GetNtime() == 0) {
1007 // Create missing containers
1008 signals->Allocate(nRowMax,nColMax,nTimeTotal);
1011 // Expand the container if neccessary
1012 if (fCompress) signals->Expand();
1014 // Create the missing dictionary containers
1016 for (iDict = 0; iDict < kNDict; iDict++) {
1017 dictionary[iDict] = fDigitsManager->GetDictionary(iDet,iDict);
1018 if (dictionary[iDict]->GetNtime() == 0) {
1019 dictionary[iDict]->Allocate(nRowMax,nColMax,nTimeTotal);
1026 // Don't create noise in detectors that are switched off
1027 if (CheckDetector(plane,chamber,sector)) {
1029 // Create the digits for this chamber
1030 for (iRow = 0; iRow < nRowMax; iRow++ ) {
1031 for (iCol = 0; iCol < nColMax; iCol++ ) {
1033 // Create summable digits
1036 for (iTime = 0; iTime < nTimeTotal; iTime++) {
1037 Float_t signalAmp = signals->GetDataUnchecked(iRow,iCol,iTime);
1038 signalAmp *= fSDigitsScale;
1039 signalAmp = TMath::Min(signalAmp,(Float_t) 1.0e9);
1040 Int_t adc = (Int_t) signalAmp;
1041 if (adc > 0) nDigits++;
1042 digits->SetDataUnchecked(iRow,iCol,iTime,adc);
1046 // Create normal digits
1049 for (iTime = 0; iTime < nTimeTotal; iTime++) {
1050 Float_t signalAmp = signals->GetDataUnchecked(iRow,iCol,iTime);
1051 // Pad and time coupling
1052 signalAmp *= coupling;
1053 // Add the noise, starting from minus ADC baseline in electrons
1054 Double_t baselineEl = fPar->GetADCbaseline() * (fPar->GetADCinRange()
1055 / fPar->GetADCoutRange())
1057 signalAmp = TMath::Max((Double_t) gRandom->Gaus(signalAmp,fPar->GetNoise())
1060 signalAmp *= convert;
1061 // Add ADC baseline in mV
1062 signalAmp += fPar->GetADCbaseline() * (fPar->GetADCinRange()
1063 / fPar->GetADCoutRange());
1064 // Convert to ADC counts. Set the overflow-bit fADCoutRange if the
1065 // signal is larger than fADCinRange
1067 if (signalAmp >= fPar->GetADCinRange()) {
1068 adc = ((Int_t) fPar->GetADCoutRange());
1071 adc = ((Int_t) (signalAmp * (fPar->GetADCoutRange()
1072 / fPar->GetADCinRange())));
1075 outADC[iTime] = adc;
1078 // Apply the tail cancelation via the digital filter
1080 DeConvExp(inADC,outADC,nTimeTotal,fPar->GetTCnexp());
1083 for (iTime = 0; iTime < nTimeTotal; iTime++) {
1084 // Store the amplitude of the digit if above threshold
1085 if (outADC[iTime] > fPar->GetADCthreshold()) {
1087 printf(" iRow = %d, iCol = %d, iTime = %d, adc = %f\n"
1088 ,iRow,iCol,iTime,outADC[iTime]);
1091 digits->SetDataUnchecked(iRow,iCol,iTime,((Int_t) outADC[iTime]));
1102 // Compress the arrays
1104 digits->Compress(1,0);
1105 for (iDict = 0; iDict < kNDict; iDict++) {
1106 dictionary[iDict]->Compress(1,0);
1109 totalSizeDigits += digits->GetSize();
1110 totalSizeDict0 += dictionary[0]->GetSize();
1111 totalSizeDict1 += dictionary[1]->GetSize();
1112 totalSizeDict2 += dictionary[2]->GetSize();
1114 Float_t nPixel = nRowMax * nColMax * nTimeMax;
1116 printf("<AliTRDdigitizer::MakeDigits> ");
1117 printf("Found %d digits in detector %d (%3.0f).\n"
1119 ,100.0 * ((Float_t) nDigits) / nPixel);
1122 if (fCompress) signals->Compress(1,0);
1132 delete signalsArray;
1137 printf("<AliTRDdigitizer::MakeDigits> ");
1138 printf("Total number of analyzed hits = %d\n",countHits);
1140 printf("<AliTRDdigitizer::MakeDigits> ");
1141 printf("Total digits data size = %d, %d, %d, %d\n",totalSizeDigits
1152 //_____________________________________________________________________________
1153 void AliTRDdigitizer::AddSDigitsManager(AliTRDdigitsManager *man)
1156 // Add a digits manager for s-digits to the input list.
1159 fSDigitsManagerList->Add(man);
1163 //_____________________________________________________________________________
1164 void AliTRDdigitizer::DeleteSDigitsManager()
1167 // Removes digits manager from the input list.
1170 fSDigitsManagerList->Delete();
1174 //_____________________________________________________________________________
1175 Bool_t AliTRDdigitizer::ConvertSDigits()
1178 // Converts s-digits to normal digits
1181 // Number of track dictionary arrays
1182 const Int_t kNDict = AliTRDdigitsManager::kNDict;
1184 // Converts number of electrons to fC
1185 const Double_t kEl2fC = 1.602E-19 * 1.0E15;
1193 fPar = new AliTRDparameter("TRDparameter","Standard parameter");
1195 printf("<AliTRDdigitizer::ConvertSDigits> ");
1196 printf("Create the default parameter object\n");
1200 Double_t sDigitsScale = 1.0 / GetSDigitsScale();
1201 Double_t noise = fPar->GetNoise();
1202 Double_t padCoupling = fPar->GetPadCoupling();
1203 Double_t timeCoupling = fPar->GetTimeCoupling();
1204 Double_t chipGain = fPar->GetChipGain();
1205 Double_t coupling = padCoupling * timeCoupling;
1206 Double_t convert = kEl2fC * chipGain;
1207 Double_t adcInRange = fPar->GetADCinRange();
1208 Double_t adcOutRange = fPar->GetADCoutRange();
1209 Int_t adcThreshold = fPar->GetADCthreshold();
1210 Int_t adcBaseline = fPar->GetADCbaseline();
1212 AliTRDdataArrayI *digitsIn;
1213 AliTRDdataArrayI *digitsOut;
1214 AliTRDdataArrayI *dictionaryIn[kNDict];
1215 AliTRDdataArrayI *dictionaryOut[kNDict];
1217 // Loop through the detectors
1218 for (Int_t iDet = 0; iDet < AliTRDgeometry::Ndet(); iDet++) {
1221 printf("<AliTRDdigitizer::ConvertSDigits> ");
1222 printf("Convert detector %d to digits.\n",iDet);
1225 Int_t plane = fGeo->GetPlane(iDet);
1226 Int_t sector = fGeo->GetSector(iDet);
1227 Int_t chamber = fGeo->GetChamber(iDet);
1228 Int_t nRowMax = fPar->GetRowMax(plane,chamber,sector);
1229 Int_t nColMax = fPar->GetColMax(plane);
1230 Int_t nTimeTotal = fPar->GetTimeTotal();
1232 Double_t *inADC = new Double_t[nTimeTotal];
1233 Double_t *outADC = new Double_t[nTimeTotal];
1235 digitsIn = fSDigitsManager->GetDigits(iDet);
1237 digitsOut = fDigitsManager->GetDigits(iDet);
1238 digitsOut->Allocate(nRowMax,nColMax,nTimeTotal);
1239 for (iDict = 0; iDict < kNDict; iDict++) {
1240 dictionaryIn[iDict] = fSDigitsManager->GetDictionary(iDet,iDict);
1241 dictionaryIn[iDict]->Expand();
1242 dictionaryOut[iDict] = fDigitsManager->GetDictionary(iDet,iDict);
1243 dictionaryOut[iDict]->Allocate(nRowMax,nColMax,nTimeTotal);
1246 for (iRow = 0; iRow < nRowMax; iRow++ ) {
1247 for (iCol = 0; iCol < nColMax; iCol++ ) {
1249 for (iTime = 0; iTime < nTimeTotal; iTime++) {
1250 Double_t signal = (Double_t) digitsIn->GetDataUnchecked(iRow,iCol,iTime);
1251 signal *= sDigitsScale;
1252 // Pad and time coupling
1254 // Add the noise, starting from minus ADC baseline in electrons
1255 Double_t baselineEl = adcBaseline * (adcInRange / adcOutRange) / convert;
1256 signal = TMath::Max((Double_t) gRandom->Gaus(signal,noise),-baselineEl);
1259 // add ADC baseline in mV
1260 signal += adcBaseline * (adcInRange / adcOutRange);
1261 // Convert to ADC counts. Set the overflow-bit adcOutRange if the
1262 // signal is larger than adcInRange
1264 if (signal >= adcInRange) {
1265 adc = ((Int_t) adcOutRange);
1268 adc = ((Int_t) (signal * (adcOutRange / adcInRange)));
1271 outADC[iTime] = adc;
1274 // Apply the tail cancelation via the digital filter
1276 DeConvExp(inADC,outADC,nTimeTotal,fPar->GetTCnexp());
1279 for (iTime = 0; iTime < nTimeTotal; iTime++) {
1280 // Store the amplitude of the digit if above threshold
1281 if (outADC[iTime] > adcThreshold) {
1282 digitsOut->SetDataUnchecked(iRow,iCol,iTime,((Int_t) outADC[iTime]));
1283 // Copy the dictionary
1284 for (iDict = 0; iDict < kNDict; iDict++) {
1285 Int_t track = dictionaryIn[iDict]->GetDataUnchecked(iRow,iCol,iTime);
1286 dictionaryOut[iDict]->SetDataUnchecked(iRow,iCol,iTime,track);
1295 digitsIn->Compress(1,0);
1296 digitsOut->Compress(1,0);
1297 for (iDict = 0; iDict < kNDict; iDict++) {
1298 dictionaryIn[iDict]->Compress(1,0);
1299 dictionaryOut[iDict]->Compress(1,0);
1312 //_____________________________________________________________________________
1313 Bool_t AliTRDdigitizer::MergeSDigits()
1316 // Merges the input s-digits:
1317 // - The amplitude of the different inputs are summed up.
1318 // - Of the track IDs from the input dictionaries only one is
1319 // kept for each input. This works for maximal 3 different merged inputs.
1322 // Number of track dictionary arrays
1323 const Int_t kNDict = AliTRDdigitsManager::kNDict;
1326 fPar = new AliTRDparameter("TRDparameter","Standard parameter");
1328 printf("<AliTRDdigitizer::MergeSDigits> ");
1329 printf("Create the default parameter object\n");
1336 AliTRDdataArrayI *digitsA;
1337 AliTRDdataArrayI *digitsB;
1338 AliTRDdataArrayI *dictionaryA[kNDict];
1339 AliTRDdataArrayI *dictionaryB[kNDict];
1341 // Get the first s-digits
1342 fSDigitsManager = (AliTRDdigitsManager *) fSDigitsManagerList->First();
1343 if (!fSDigitsManager) return kFALSE;
1345 // Loop through the other sets of s-digits
1346 AliTRDdigitsManager *mergeSDigitsManager;
1347 mergeSDigitsManager = (AliTRDdigitsManager *)
1348 fSDigitsManagerList->After(fSDigitsManager);
1351 if (mergeSDigitsManager) {
1352 printf("<AliTRDdigitizer::MergeSDigits> ");
1353 printf("Merge %d input files.\n",fSDigitsManagerList->GetSize());
1356 printf("<AliTRDdigitizer::MergeSDigits> ");
1357 printf("Only one input file.\n");
1362 while (mergeSDigitsManager) {
1366 // Loop through the detectors
1367 for (Int_t iDet = 0; iDet < AliTRDgeometry::Ndet(); iDet++) {
1369 Int_t plane = fGeo->GetPlane(iDet);
1370 Int_t sector = fGeo->GetSector(iDet);
1371 Int_t chamber = fGeo->GetChamber(iDet);
1372 Int_t nRowMax = fPar->GetRowMax(plane,chamber,sector);
1373 Int_t nColMax = fPar->GetColMax(plane);
1374 Int_t nTimeTotal = fPar->GetTimeTotal();
1376 // Loop through the pixels of one detector and add the signals
1377 digitsA = fSDigitsManager->GetDigits(iDet);
1378 digitsB = mergeSDigitsManager->GetDigits(iDet);
1381 for (iDict = 0; iDict < kNDict; iDict++) {
1382 dictionaryA[iDict] = fSDigitsManager->GetDictionary(iDet,iDict);
1383 dictionaryB[iDict] = mergeSDigitsManager->GetDictionary(iDet,iDict);
1384 dictionaryA[iDict]->Expand();
1385 dictionaryB[iDict]->Expand();
1388 // Merge only detectors that contain a signal
1389 Bool_t doMerge = kTRUE;
1390 if (fMergeSignalOnly) {
1391 if (digitsA->GetOverThreshold(0) == 0) {
1399 printf("<AliTRDdigitizer::MergeSDigits> ");
1400 printf("Merge detector %d of input no.%d\n",iDet,iMerge+1);
1403 for (Int_t iRow = 0; iRow < nRowMax; iRow++ ) {
1404 for (Int_t iCol = 0; iCol < nColMax; iCol++ ) {
1405 for (Int_t iTime = 0; iTime < nTimeTotal; iTime++) {
1407 // Add the amplitudes of the summable digits
1408 Int_t ampA = digitsA->GetDataUnchecked(iRow,iCol,iTime);
1409 Int_t ampB = digitsB->GetDataUnchecked(iRow,iCol,iTime);
1411 digitsA->SetDataUnchecked(iRow,iCol,iTime,ampA);
1413 // Add the mask to the track id if defined.
1414 for (iDict = 0; iDict < kNDict; iDict++) {
1415 Int_t trackB = dictionaryB[iDict]->GetDataUnchecked(iRow,iCol,iTime);
1416 if ((fMasks) && (trackB > 0)) {
1417 for (jDict = 0; jDict < kNDict; jDict++) {
1418 Int_t trackA = dictionaryA[iDict]->GetDataUnchecked(iRow,iCol,iTime);
1420 trackA = trackB + fMasks[iMerge];
1421 dictionaryA[iDict]->SetDataUnchecked(iRow,iCol,iTime,trackA);
1434 digitsA->Compress(1,0);
1435 digitsB->Compress(1,0);
1436 for (iDict = 0; iDict < kNDict; iDict++) {
1437 dictionaryA[iDict]->Compress(1,0);
1438 dictionaryB[iDict]->Compress(1,0);
1444 // The next set of s-digits
1445 mergeSDigitsManager = (AliTRDdigitsManager *)
1446 fSDigitsManagerList->After(mergeSDigitsManager);
1454 //_____________________________________________________________________________
1455 Bool_t AliTRDdigitizer::SDigits2Digits()
1458 // Merges the input s-digits and converts them to normal digits
1461 if (!MergeSDigits()) return kFALSE;
1463 return ConvertSDigits();
1467 //_____________________________________________________________________________
1468 Bool_t AliTRDdigitizer::CheckDetector(Int_t plane, Int_t chamber, Int_t sector)
1471 // Checks whether a detector is enabled
1474 if (fSimpleSim) return kTRUE;
1476 if ((fTRD->GetSensChamber() >= 0) &&
1477 (fTRD->GetSensChamber() != chamber)) return kFALSE;
1478 if ((fTRD->GetSensPlane() >= 0) &&
1479 (fTRD->GetSensPlane() != plane)) return kFALSE;
1480 if ( fTRD->GetSensSector() >= 0) {
1481 Int_t sens1 = fTRD->GetSensSector();
1482 Int_t sens2 = sens1 + fTRD->GetSensSectorRange();
1483 sens2 -= ((Int_t) (sens2 / AliTRDgeometry::Nsect()))
1484 * AliTRDgeometry::Nsect();
1485 if (sens1 < sens2) {
1486 if ((sector < sens1) || (sector >= sens2)) return kFALSE;
1489 if ((sector < sens1) && (sector >= sens2)) return kFALSE;
1497 //_____________________________________________________________________________
1498 Bool_t AliTRDdigitizer::WriteDigits() const
1501 // Writes out the TRD-digits and the dictionaries
1505 fRunLoader->CdGAFile();
1506 if (!gFile->Get("TRDparameter")) GetParameter()->Write();
1508 // Store the digits and the dictionary in the tree
1509 return fDigitsManager->WriteDigits();
1513 //_____________________________________________________________________________
1514 void AliTRDdigitizer::DeConvExp(Double_t *source, Double_t *target
1515 , Int_t n, Int_t nexp)
1518 // Does the deconvolution by the digital filter.
1520 // Author: Marcus Gutfleisch, KIP Heidelberg
1521 // Optimized for: New TRF from Venelin Angelov, simulated with CADENCE
1522 // Pad-ground capacitance = 25 pF
1523 // Pad-pad cross talk capacitance = 6 pF
1524 // For 10 MHz digitization, corresponding to 20 time bins
1525 // in the drift region
1529 Double_t coefficients[2];
1531 /* initialize (coefficient = alpha, rates = lambda) */
1534 rates[0] = 0.466998;
1536 coefficients[0] = 1.0;
1539 rates[0] = 0.8988162;
1540 coefficients[0] = 0.11392069;
1541 rates[1] = 0.3745688;
1542 coefficients[1] = 0.8860793;
1544 Float_t sumc = coefficients[0]+coefficients[1];
1545 coefficients[0] /= sumc;
1546 coefficients[1] /= sumc;
1550 Double_t reminder[2];
1551 Double_t correction, result;
1553 /* attention: computation order is important */
1555 for ( k = 0; k < nexp; k++ ) reminder[k]=0.0;
1557 for ( i = 0; i < n; i++ ) {
1558 result = ( source[i] - correction ); /* no rescaling */
1561 for ( k = 0; k < nexp; k++ ) reminder[k] = rates[k]
1562 * ( reminder[k] + coefficients[k] * result);
1565 for ( k = 0; k < nexp; k++ ) correction += reminder[k];
1570 //_____________________________________________________________________________
1571 void AliTRDdigitizer::InitOutput(Int_t iEvent)
1574 // Initializes the output branches
1581 Error("InitOutput","Run Loader is NULL");
1584 AliLoader* loader = fRunLoader->GetLoader("TRDLoader");
1587 Error("Open","Can not get TRD loader from Run Loader");
1595 //if we produce SDigits
1596 tree = loader->TreeS();
1599 loader->MakeTree("S");
1600 tree = loader->TreeS();
1604 {//if we produce Digits
1605 tree = loader->TreeD();
1608 loader->MakeTree("D");
1609 tree = loader->TreeD();
1612 fDigitsManager->SetEvent(iEvent);
1613 fDigitsManager->MakeBranch(tree);