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 **************************************************************************/
19 #include "AliMUONDigitizerV3.h"
22 #include "AliMUONCalibrationData.h"
23 #include "AliMUONConstants.h"
24 #include "AliMUONData.h"
25 #include "AliMUONDataIterator.h"
26 #include "AliMUONDigit.h"
27 #include "AliMUONSegmentation.h"
28 #include "AliMUONTriggerEfficiencyCells.h"
29 #include "AliMUONTriggerElectronics.h"
30 #include "AliMUONVCalibParam.h"
32 #include "AliMpDEIterator.h"
33 #include "AliMpDEManager.h"
34 #include "AliMpIntPair.h"
36 #include "AliMpStationType.h"
37 #include "AliMpSegmentation.h"
38 #include "AliMpVSegmentation.h"
39 #include "AliMpDEManager.h"
40 #include "AliMpCathodType.h"
43 #include "AliRunDigitizer.h"
44 #include "AliRunLoader.h"
47 #include <Riostream.h>
53 /// \class AliMUONDigitizerV3
54 /// The digitizer is performing the transformation to go from SDigits (digits
55 /// w/o any electronic noise) to Digits (w/ electronic noise, and decalibration)
57 /// The decalibration is performed by doing the reverse operation of the
58 /// calibration, that is we do (Signal+pedestal)/gain -> ADC
60 /// Note also that the digitizer takes care of merging sdigits that belongs
61 /// to the same pad, either because we're merging several input sdigit files
62 /// or with a single file because the sdigitizer does not merge sdigits itself
63 /// (for performance reason mainly, and because anyway we know we have to do it
64 /// here, at the digitization level).
71 return static_cast<AliMUON*>(gAlice->GetModule("MUON"));
75 const Double_t AliMUONDigitizerV3::fgkNSigmas=3;
78 ClassImp(AliMUONDigitizerV3)
81 //_____________________________________________________________________________
82 AliMUONDigitizerV3::AliMUONDigitizerV3(AliRunDigitizer* manager,
83 Bool_t generateNoisyDigits)
84 : AliDigitizer(manager),
85 fIsInitialized(kFALSE),
87 fCalibrationData(0x0),
88 fTriggerProcessor(0x0),
89 fTriggerEfficiency(0x0),
90 fFindDigitIndexTimer(),
91 fGenerateNoisyDigitsTimer(),
94 fGenerateNoisyDigits(generateNoisyDigits)
98 AliDebug(1,Form("AliRunDigitizer=%p",fManager));
99 fGenerateNoisyDigitsTimer.Start(kTRUE); fGenerateNoisyDigitsTimer.Stop();
100 fExecTimer.Start(kTRUE); fExecTimer.Stop();
101 fFindDigitIndexTimer.Start(kTRUE); fFindDigitIndexTimer.Stop();
104 //_____________________________________________________________________________
105 AliMUONDigitizerV3::~AliMUONDigitizerV3()
107 /// Dtor. Note we're the owner of some pointers.
112 delete fCalibrationData;
113 delete fTriggerProcessor;
114 delete fNoiseFunction;
116 AliDebug(1, Form("Execution time for FindDigitIndex() : R:%.2fs C:%.2fs",
117 fFindDigitIndexTimer.RealTime(),fFindDigitIndexTimer.CpuTime()));
118 if ( fGenerateNoisyDigits )
120 AliDebug(1, Form("Execution time for GenerateNoisyDigits() : R:%.2fs C:%.2fs",
121 fGenerateNoisyDigitsTimer.RealTime(),
122 fGenerateNoisyDigitsTimer.CpuTime()));
124 AliDebug(1, Form("Execution time for Exec() : R:%.2fs C:%.2fs",
125 fExecTimer.RealTime(),fExecTimer.CpuTime()));
129 //_____________________________________________________________________________
131 AliMUONDigitizerV3::ApplyResponseToTrackerDigit(AliMUONDigit& digit, Bool_t addNoise)
133 /// For tracking digits, starting from an ideal digit's charge, we :
135 /// - add some noise (thus leading to a realistic charge), if requested to do so
136 /// - divide by a gain (thus decalibrating the digit)
137 /// - add a pedestal (thus decalibrating the digit)
138 /// - sets the signal to zero if below 3*sigma of the noise
140 static const Int_t kMaxADC = (1<<12)-1; // We code the charge on a 12 bits ADC.
142 Float_t signal = digit.Signal();
146 digit.SetADC(TMath::Nint(signal));
150 Int_t detElemId = digit.DetElemId();
152 Int_t manuId = digit.ManuId();
153 Int_t manuChannel = digit.ManuChannel();
155 AliMUONVCalibParam* pedestal = fCalibrationData->Pedestals(detElemId,manuId);
158 AliFatal(Form("Could not get pedestal for DE=%d manuId=%d",
161 Float_t pedestalMean = pedestal->ValueAsFloat(manuChannel,0);
162 Float_t pedestalSigma = pedestal->ValueAsFloat(manuChannel,1);
164 AliMUONVCalibParam* gain = fCalibrationData->Gains(detElemId,manuId);
167 AliFatal(Form("Could not get gain for DE=%d manuId=%d",
170 Float_t gainMean = gain->ValueAsFloat(manuChannel,0);
172 Float_t adcNoise = gRandom->Gaus(0.0,pedestalSigma);
176 if ( gainMean < 1E-6 )
178 AliError(Form("Got a too small gain %e for DE=%d manuId=%d manuChannel=%d. "
179 "Setting signal to 0.",
180 gainMean,detElemId,manuId,manuChannel));
185 adc = TMath::Nint( signal / gainMean + pedestalMean + adcNoise);///
187 if ( adc <= pedestalMean + fgkNSigmas*pedestalSigma )
193 // be sure we stick to 12 bits.
199 digit.SetPhysicsSignal(TMath::Nint(signal));
200 digit.SetSignal(adc);
204 //_____________________________________________________________________________
206 AliMUONDigitizerV3::ApplyResponseToTriggerDigit(AliMUONDigit& digit,
209 /// \todo add comment
211 if ( !fTriggerEfficiency ) return;
213 AliMUONDigit* correspondingDigit = FindCorrespondingDigit(digit,data);
215 if(!correspondingDigit)return;//reject bad correspondences
217 Int_t detElemId = digit.DetElemId();
219 AliMpSegmentation* segmentation = AliMpSegmentation::Instance();
220 const AliMpVSegmentation* segment[2] =
222 segmentation->GetMpSegmentation(detElemId,AliMp::GetCathodType(digit.Cathode())),
223 segmentation->GetMpSegmentation(detElemId,AliMp::GetCathodType(correspondingDigit->Cathode()))
228 segment[0]->PadByIndices(AliMpIntPair(digit.PadX(),digit.PadY()),kTRUE),
229 segment[1]->PadByIndices(AliMpIntPair(correspondingDigit->PadX(),correspondingDigit->PadY()),kTRUE)
233 if (digit.Cathode()==0)p0=0;
235 AliMpIntPair location = pad[p0].GetLocation(0);
236 Int_t nboard = location.GetFirst();
240 fTriggerEfficiency->IsTriggered(detElemId, nboard-1,
241 isTrig[0], isTrig[1]);
243 if (!isTrig[digit.Cathode()])
248 if ( &digit != correspondingDigit )
250 if (!isTrig[correspondingDigit->Cathode()])
252 correspondingDigit->SetSignal(0);
257 //_____________________________________________________________________________
259 AliMUONDigitizerV3::ApplyResponse()
261 /// Loop over all chamber digits, and apply the response to them
262 /// Note that this method may remove digits.
264 const Bool_t kAddNoise = kTRUE;
266 for ( Int_t ich = 0; ich < AliMUONConstants::NCh(); ++ich )
268 TClonesArray* digits = fOutputData->Digits(ich);
269 Int_t n = digits->GetEntriesFast();
270 Bool_t trackingChamber = ( ich < AliMUONConstants::NTrackingCh() );
271 for ( Int_t i = 0; i < n; ++i )
273 AliMUONDigit* d = static_cast<AliMUONDigit*>(digits->UncheckedAt(i));
274 if ( trackingChamber )
276 ApplyResponseToTrackerDigit(*d,kAddNoise);
280 ApplyResponseToTriggerDigit(*d,fOutputData);
282 if ( d->Signal() <= 0 )
290 // The version below, using iterator, does not yet work (as the iterator
291 // assumes it is reading digits from the tree, while in this case it's
294 // AliMUONDigit* digit(0x0);
296 // // First loop on tracker digits
297 // AliMUONDataIterator tracker(fOutputData,"D",AliMUONDataIterator::kTrackingChambers);
299 // while ( ( digit = static_cast<AliMUONDigit*>(tracker.Next()) ) )
301 // ApplyResponseToTrackerDigit(*digit);
302 // if ( digit->Signal() <= 0 )
309 // // Then loop on trigger digits
310 // AliMUONDataIterator trigger(fOutputData,"D",AliMUONDataIterator::kTriggerChambers);
312 // while ( ( digit = static_cast<AliMUONDigit*>(trigger.Next()) ) )
314 // ApplyResponseToTriggerDigit(*digit,fOutputData);
315 // if ( digit->Signal() <= 0 )
322 //_____________________________________________________________________________
324 AliMUONDigitizerV3::AddOrUpdateDigit(TClonesArray& array,
325 const AliMUONDigit& digit)
327 /// Add or update a digit, depending on whether there's already a digit
328 /// for the corresponding channel.
330 Int_t ix = FindDigitIndex(array,digit);
334 AliMUONDigit* d = static_cast<AliMUONDigit*>(array.UncheckedAt(ix));
335 Bool_t ok = MergeDigits(digit,*d);
338 AliError("Digits are not mergeable !");
343 ix = array.GetLast() + 1;
344 new(array[ix]) AliMUONDigit(digit);
349 //_____________________________________________________________________________
351 AliMUONDigitizerV3::Exec(Option_t*)
354 /// We first loop over input files, and merge the sdigits we found there.
355 /// Second, we digitize all the resulting sdigits
356 /// Then we generate noise-only digits (for tracker only)
357 /// And we finally generate the trigger outputs.
359 AliDebug(1, "Running digitizer.");
361 if ( fManager->GetNinputs() == 0 )
363 AliWarning("No input set. Nothing to do.");
367 if ( !fIsInitialized )
369 AliError("Not initialized. Cannot perform the work. Sorry");
373 fExecTimer.Start(kFALSE);
375 Int_t nInputFiles = fManager->GetNinputs();
377 if ( fOutputData->TreeD() == 0x0 )
379 AliDebug(1,"Calling MakeDigitsContainer");
380 fOutputData->GetLoader()->MakeDigitsContainer();
382 fOutputData->MakeBranch("D,GLT");
383 fOutputData->SetTreeAddress("D,GLT");
385 // Loop over all the input files, and merge the sdigits found in those
387 for ( Int_t iFile = 0; iFile < nInputFiles; ++iFile )
389 AliMUONData* inputData = GetDataAccess(fManager->GetInputFolderName(iFile));
392 AliFatal(Form("Could not get access to input file #%d",iFile));
395 inputData->GetLoader()->LoadSDigits("READ");
396 inputData->SetTreeAddress("S");
397 inputData->GetSDigits();
399 MergeWithSDigits(*fOutputData,*inputData,fManager->GetMask(iFile));
401 inputData->ResetSDigits();
402 inputData->GetLoader()->UnloadSDigits();
406 // At this point, we do have digit arrays (one per chamber) which contains
407 // the merging of all the sdigits of the input file(s).
408 // We now massage them to apply the detector response, i.e. this
409 // is here that we do the "digitization" work.
413 if ( fGenerateNoisyDigits )
415 // Generate noise-only digits for tracker.
416 GenerateNoisyDigits();
419 // We generate the global and local trigger decisions.
420 fTriggerProcessor->ExecuteTask();
422 // Fill the output treeD
423 fOutputData->Fill("D,GLT");
425 // Write to the output tree(D).
426 // Please note that as GlobalTrigger, LocalTrigger and Digits are in the same
427 // tree (=TreeD) in different branches, this WriteDigits in fact writes all of
429 fOutputData->GetLoader()->WriteDigits("OVERWRITE");
431 // Finally, we clean up after ourselves.
432 fOutputData->ResetDigits();
433 fOutputData->ResetTrigger();
434 fOutputData->GetLoader()->UnloadDigits();
439 //_____________________________________________________________________________
441 AliMUONDigitizerV3::FindCorrespondingDigit(AliMUONDigit& digit,
442 AliMUONData* data) const
444 /// \todo add comment
446 AliMUONDataIterator it(data,"D",AliMUONDataIterator::kTriggerChambers);
450 cd = static_cast<AliMUONDigit*>(it.Next());
452 if (cd->DetElemId() == digit.DetElemId() &&
453 cd->PadX() == digit.PadX() &&
454 cd->PadY() == digit.PadY() &&
455 cd->Cathode() == digit.Cathode()){
459 //The corresponding digit is searched only forward in the AliMUONData.
460 //In this way when the first digit of the couple is given, the second digit is found and the efficiency is applied to both.
461 //Afterwards, when the second digit of the couple is given the first one is not found and hence efficiency is not applied again
463 while ( ( cd = static_cast<AliMUONDigit*>(it.Next()) ) )
465 if(!cd)continue;//avoid problems when 1 digit is removed
466 if ( cd->DetElemId() == digit.DetElemId() &&
467 cd->Hit() == digit.Hit() &&
468 cd->Cathode() != digit.Cathode() )
477 //_____________________________________________________________________________
479 AliMUONDigitizerV3::FindDigitIndex(TClonesArray& array,
480 const AliMUONDigit& digit) const
482 /// Return the index of digit within array, if that digit is there,
483 /// otherwise returns -1
485 /// \todo FIXME: this is of course not the best implementation you can think of.
486 /// Reconsider the use of hit/digit map... ? (but be sure it's needed!)
488 fFindDigitIndexTimer.Start(kFALSE);
490 Int_t n = array.GetEntriesFast();
491 for ( Int_t i = 0; i < n; ++i )
493 AliMUONDigit* d = static_cast<AliMUONDigit*>(array.UncheckedAt(i));
494 if ( d->DetElemId() == digit.DetElemId() &&
495 d->PadX() == digit.PadX() &&
496 d->PadY() == digit.PadY() &&
497 d->Cathode() == digit.Cathode() )
499 fFindDigitIndexTimer.Stop();
503 fFindDigitIndexTimer.Stop();
507 //_____________________________________________________________________________
509 AliMUONDigitizerV3::GenerateNoisyDigits()
511 /// According to a given probability, generate digits that
512 /// have a signal above the noise cut (ped+n*sigma_ped), i.e. digits
513 /// that are "only noise".
515 if ( !fNoiseFunction )
517 fNoiseFunction = new TF1("AliMUONDigitizerV3::fNoiseFunction","gaus",
518 fgkNSigmas,fgkNSigmas*10);
520 fNoiseFunction->SetParameters(1,0,1);
523 fGenerateNoisyDigitsTimer.Start(kFALSE);
525 for ( Int_t i = 0; i < AliMUONConstants::NTrackingCh(); ++i )
531 while ( !it.IsDone() )
533 for ( Int_t cathode = 0; cathode < 2; ++cathode )
535 GenerateNoisyDigitsForOneCathode(it.CurrentDEId(),cathode);
541 fGenerateNoisyDigitsTimer.Stop();
544 //_____________________________________________________________________________
546 AliMUONDigitizerV3::GenerateNoisyDigitsForOneCathode(Int_t detElemId, Int_t cathode)
548 /// Generate noise-only digits for one cathode of one detection element.
549 /// Called by GenerateNoisyDigits()
551 Int_t chamberId = AliMpDEManager::GetChamberId(detElemId);
552 TClonesArray* digits = fOutputData->Digits(chamberId);
554 const AliMpVSegmentation* seg
555 = AliMpSegmentation::Instance()->GetMpSegmentation(detElemId,AliMp::GetCathodType(cathode));
556 Int_t nofPads = seg->NofPads();
558 Int_t maxIx = seg->MaxPadIndexX();
559 Int_t maxIy = seg->MaxPadIndexY();
561 static const Double_t kProbToBeOutsideNsigmas = TMath::Erfc(fgkNSigmas/TMath::Sqrt(2.0)) / 2. ;
563 Int_t nofNoisyPads = TMath::Nint(kProbToBeOutsideNsigmas*nofPads);
564 if ( !nofNoisyPads ) return;
567 TMath::Nint(gRandom->Gaus(nofNoisyPads,
568 nofNoisyPads/TMath::Sqrt(nofNoisyPads)));
570 AliDebug(3,Form("DE %d cath %d nofNoisyPads %d",detElemId,cathode,nofNoisyPads));
572 for ( Int_t i = 0; i < nofNoisyPads; ++i )
577 ix = gRandom->Integer(maxIx+1);
578 iy = gRandom->Integer(maxIy+1);
579 } while ( !seg->HasPad(AliMpIntPair(ix,iy)) );
581 d.SetDetElemId(detElemId);
582 d.SetCathode(cathode);
585 if ( FindDigitIndex(*digits,d) >= 0 )
587 // this digit is already there, and not noise-only, we simply skip it
590 AliMpPad pad = seg->PadByIndices(AliMpIntPair(ix,iy));
591 Int_t manuId = pad.GetLocation().GetFirst();
592 Int_t manuChannel = pad.GetLocation().GetSecond();
594 d.SetElectronics(manuId,manuChannel);
596 AliMUONVCalibParam* pedestals = fCalibrationData->Pedestals(detElemId,manuId);
598 Float_t pedestalMean = pedestals->ValueAsFloat(manuChannel,0);
599 Float_t pedestalSigma = pedestals->ValueAsFloat(manuChannel,1);
601 Double_t ped = fNoiseFunction->GetRandom()*pedestalSigma;
603 d.SetSignal(TMath::Nint(ped+pedestalMean+0.5));
604 d.SetPhysicsSignal(0);
606 AliDebug(3,Form("Adding a pure noise digit :"));
607 StdoutToAliDebug(3,cout << "Before Response: " << endl;
609 ApplyResponseToTrackerDigit(d,kFALSE);
610 if ( d.Signal() > 0 )
612 AddOrUpdateDigit(*digits,d);
616 AliError("Pure noise below threshold. This should not happen. Not adding "
619 StdoutToAliDebug(3,cout << "After Response: " << endl;
624 //_____________________________________________________________________________
626 AliMUONDigitizerV3::GetDataAccess(const TString& folderName)
628 /// Create an AliMUONData to deal with data found in folderName.
630 AliDebug(1,Form("Getting access to folder %s",folderName.Data()));
631 AliRunLoader* runLoader = AliRunLoader::GetRunLoader(folderName);
634 AliError(Form("Could not get RunLoader from folder %s",folderName.Data()));
637 AliLoader* loader = static_cast<AliLoader*>(runLoader->GetLoader("MUONLoader"));
640 AliError(Form("Could not get MuonLoader from folder %s",folderName.Data()));
643 AliMUONData* data = new AliMUONData(loader,"MUON","MUONDataForDigitOutput");
644 AliDebug(1,Form("AliMUONData=%p loader=%p",data,loader));
648 //_____________________________________________________________________________
650 AliMUONDigitizerV3::Init()
652 /// Initialization of the TTask :
653 /// a) set the outputData pointer
654 /// b) create the calibrationData, according to run number
655 /// c) create the trigger processing task
659 if ( fIsInitialized )
661 AliError("Object already initialized.");
667 AliError("fManager is null !");
671 fOutputData = GetDataAccess(fManager->GetOutputFolderName());
674 AliError("Can not perform digitization. I'm sorry");
677 AliDebug(1,Form("fOutputData=%p",fOutputData));
679 AliRunLoader* runLoader = fOutputData->GetLoader()->GetRunLoader();
680 AliRun* galice = runLoader->GetAliRun();
681 Int_t runnumber = galice->GetRunNumber();
683 fCalibrationData = new AliMUONCalibrationData(runnumber);
685 fTriggerProcessor = new AliMUONTriggerElectronics(fOutputData,fCalibrationData);
687 if ( muon()->GetTriggerEffCells() )
689 fTriggerEfficiency = fCalibrationData->TriggerEfficiency();
690 if ( fTriggerEfficiency )
692 AliDebug(1, "Will apply trigger efficiency");
696 AliError("I was requested to apply trigger efficiency, but I could "
701 if ( fGenerateNoisyDigits )
703 AliDebug(1, "Will generate noise-only digits for tracker");
706 fIsInitialized = kTRUE;
710 //_____________________________________________________________________________
712 AliMUONDigitizerV3::MergeDigits(const AliMUONDigit& src,
713 AliMUONDigit& srcAndDest)
715 /// Merge 2 digits (src and srcAndDest) into srcAndDest.
717 AliDebug(1,"Merging the following digits:");
718 StdoutToAliDebug(1,src.Print("tracks"););
719 StdoutToAliDebug(1,srcAndDest.Print("tracks"););
721 Bool_t check = ( src.DetElemId() == srcAndDest.DetElemId() &&
722 src.PadX() == srcAndDest.PadX() &&
723 src.PadY() == srcAndDest.PadY() &&
724 src.Cathode() == srcAndDest.Cathode() );
730 srcAndDest.AddSignal(src.Signal());
731 srcAndDest.AddPhysicsSignal(src.Physics());
732 for ( Int_t i = 0; i < src.Ntracks(); ++i )
734 srcAndDest.AddTrack(src.Track(i),src.TrackCharge(i));
736 StdoutToAliDebug(1,cout << "result:"; srcAndDest.Print("tracks"););
740 //_____________________________________________________________________________
742 AliMUONDigitizerV3::MergeWithSDigits(AliMUONData& outputData,
743 const AliMUONData& inputData, Int_t mask)
745 /// Merge the sdigits in inputData with the digits already present in outputData
749 for ( Int_t ich = 0; ich < AliMUONConstants::NCh(); ++ich )
751 TClonesArray* iDigits = inputData.SDigits(ich);
752 TClonesArray* oDigits = outputData.Digits(ich);
755 AliError(Form("Could not get sdigits for ich=%d",ich));
758 Int_t nSDigits = iDigits->GetEntriesFast();
759 for ( Int_t k = 0; k < nSDigits; ++k )
761 AliMUONDigit* sdigit = static_cast<AliMUONDigit*>(iDigits->UncheckedAt(k));
764 AliError(Form("Could not get sdigit for ich=%d and k=%d",ich,k));
768 // Update the track references using the mask.
769 // FIXME: this is dirty, for backward compatibility only.
770 // Should re-design all this way of keeping track of MC information...
771 if ( mask ) sdigit->PatchTracks(mask);
772 // Then add or update the digit to the output.
773 AddOrUpdateDigit(*oDigits,*sdigit);