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 #include "AliMUONDigitizerV3.h"
21 #include "AliMUONCalibrationData.h"
22 #include "AliMUONConstants.h"
23 #include "AliMUONData.h"
24 #include "AliMUONDataIterator.h"
25 #include "AliMUONDigit.h"
26 #include "AliMUONSegmentation.h"
27 #include "AliMUONTriggerEfficiencyCells.h"
28 #include "AliMUONTriggerElectronics.h"
29 #include "AliMUONVCalibParam.h"
31 #include "AliMpDEIterator.h"
32 #include "AliMpDEManager.h"
33 #include "AliMpIntPair.h"
35 #include "AliMpStationType.h"
36 #include "AliMpSegmentation.h"
37 #include "AliMpVSegmentation.h"
38 #include "AliMpDEManager.h"
41 #include "AliRunDigitizer.h"
42 #include "AliRunLoader.h"
45 #include "Riostream.h"
51 /// \class AliMUONDigitizerV3
52 /// The digitizer is performing the transformation to go from SDigits (digits
53 /// w/o any electronic noise) to Digits (w/ electronic noise, and decalibration)
55 /// The decalibration is performed by doing the reverse operation of the
56 /// calibration, that is we do (Signal+pedestal)/gain -> ADC
58 /// Note also that the digitizer takes care of merging sdigits that belongs
59 /// to the same pad, either because we're merging several input sdigit files
60 /// or with a single file because the sdigitizer does not merge sdigits itself
61 /// (for performance reason mainly, and because anyway we know we have to do it
62 /// here, at the digitization level).
69 return static_cast<AliMUON*>(gAlice->GetModule("MUON"));
73 const Double_t AliMUONDigitizerV3::fgkNSigmas=3;
76 ClassImp(AliMUONDigitizerV3)
79 //_____________________________________________________________________________
80 AliMUONDigitizerV3::AliMUONDigitizerV3(AliRunDigitizer* manager,
81 Bool_t generateNoisyDigits)
82 : AliDigitizer(manager),
83 fIsInitialized(kFALSE),
85 fCalibrationData(0x0),
86 fTriggerProcessor(0x0),
87 fTriggerEfficiency(0x0),
88 fFindDigitIndexTimer(),
89 fGenerateNoisyDigitsTimer(),
92 fGenerateNoisyDigits(generateNoisyDigits)
96 AliDebug(1,Form("AliRunDigitizer=%p",fManager));
97 fGenerateNoisyDigitsTimer.Start(kTRUE); fGenerateNoisyDigitsTimer.Stop();
98 fExecTimer.Start(kTRUE); fExecTimer.Stop();
99 fFindDigitIndexTimer.Start(kTRUE); fFindDigitIndexTimer.Stop();
102 //_____________________________________________________________________________
103 AliMUONDigitizerV3::~AliMUONDigitizerV3()
105 /// Dtor. Note we're the owner of some pointers.
110 delete fCalibrationData;
111 delete fTriggerProcessor;
112 delete fNoiseFunction;
114 AliDebug(1, Form("Execution time for FindDigitIndex() : R:%.2fs C:%.2fs",
115 fFindDigitIndexTimer.RealTime(),fFindDigitIndexTimer.CpuTime()));
116 if ( fGenerateNoisyDigits )
118 AliDebug(1, Form("Execution time for GenerateNoisyDigits() : R:%.2fs C:%.2fs",
119 fGenerateNoisyDigitsTimer.RealTime(),
120 fGenerateNoisyDigitsTimer.CpuTime()));
122 AliDebug(1, Form("Execution time for Exec() : R:%.2fs C:%.2fs",
123 fExecTimer.RealTime(),fExecTimer.CpuTime()));
127 //_____________________________________________________________________________
129 AliMUONDigitizerV3::ApplyResponseToTrackerDigit(AliMUONDigit& digit, Bool_t addNoise)
131 /// For tracking digits, starting from an ideal digit's charge, we :
133 /// - add some noise (thus leading to a realistic charge), if requested to do so
134 /// - divide by a gain (thus decalibrating the digit)
135 /// - add a pedestal (thus decalibrating the digit)
136 /// - sets the signal to zero if below 3*sigma of the noise
138 static const Int_t kMaxADC = (1<<12)-1; // We code the charge on a 12 bits ADC.
140 Float_t signal = digit.Signal();
144 digit.SetADC(TMath::Nint(signal));
148 Int_t detElemId = digit.DetElemId();
150 Int_t manuId = digit.ManuId();
151 Int_t manuChannel = digit.ManuChannel();
153 AliMUONVCalibParam* pedestal = fCalibrationData->Pedestals(detElemId,manuId);
156 AliFatal(Form("Could not get pedestal for DE=%d manuId=%d",
159 Float_t pedestalMean = pedestal->ValueAsFloat(manuChannel,0);
160 Float_t pedestalSigma = pedestal->ValueAsFloat(manuChannel,1);
162 AliMUONVCalibParam* gain = fCalibrationData->Gains(detElemId,manuId);
165 AliFatal(Form("Could not get gain for DE=%d manuId=%d",
168 Float_t gainMean = gain->ValueAsFloat(manuChannel,0);
170 Float_t adcNoise = gRandom->Gaus(0.0,pedestalSigma);
174 if ( gainMean < 1E-6 )
176 AliError(Form("Got a too small gain %e for DE=%d manuId=%d manuChannel=%d. "
177 "Setting signal to 0.",
178 gainMean,detElemId,manuId,manuChannel));
183 adc = TMath::Nint( signal / gainMean + pedestalMean + adcNoise);///
185 if ( adc <= pedestalMean + fgkNSigmas*pedestalSigma )
191 // be sure we stick to 12 bits.
197 digit.SetPhysicsSignal(TMath::Nint(signal));
198 digit.SetSignal(adc);
202 //_____________________________________________________________________________
204 AliMUONDigitizerV3::ApplyResponseToTriggerDigit(AliMUONDigit& digit,
207 /// \todo add comment
209 if ( !fTriggerEfficiency ) return;
211 AliMUONDigit* correspondingDigit = FindCorrespondingDigit(digit,data);
213 if(!correspondingDigit)return;//reject bad correspondences
215 Int_t detElemId = digit.DetElemId();
217 AliMpSegmentation* segmentation = AliMpSegmentation::Instance();
218 const AliMpVSegmentation* segment[2] =
220 segmentation->GetMpSegmentation(detElemId,digit.Cathode()),
221 segmentation->GetMpSegmentation(detElemId,correspondingDigit->Cathode())
226 segment[0]->PadByIndices(AliMpIntPair(digit.PadX(),digit.PadY()),kTRUE),
227 segment[1]->PadByIndices(AliMpIntPair(correspondingDigit->PadX(),correspondingDigit->PadY()),kTRUE)
233 if (digit.Cathode()==0)
239 Float_t x = pad[ix].Position().X();
240 Float_t y = pad[iy].Position().Y();
241 if ( x==-1 && y==-1 )
245 AliError(Form("Got an unknown position for a digit in DE %d at (ix,iy)=(%d,%d)",
246 detElemId,pad[ix].GetIndices().GetFirst(),pad[iy].GetIndices().GetSecond()));
248 Float_t x0 = segment[0]->Dimensions().X();
249 Float_t y0 = segment[1]->Dimensions().Y();
250 TVector2 newCoord = fTriggerEfficiency->ChangeReferenceFrame(x, y, x0, y0);
253 fTriggerEfficiency->IsTriggered(detElemId, newCoord.Px(), newCoord.Py(),
254 isTrig[0], isTrig[1]);
256 if (!isTrig[digit.Cathode()])
261 if ( &digit != correspondingDigit )
263 if (!isTrig[correspondingDigit->Cathode()])
265 correspondingDigit->SetSignal(0);
270 //_____________________________________________________________________________
272 AliMUONDigitizerV3::ApplyResponse()
274 /// Loop over all chamber digits, and apply the response to them
275 /// Note that this method may remove digits.
277 const Bool_t kAddNoise = kTRUE;
279 for ( Int_t ich = 0; ich < AliMUONConstants::NCh(); ++ich )
281 TClonesArray* digits = fOutputData->Digits(ich);
282 Int_t n = digits->GetEntriesFast();
283 Bool_t trackingChamber = ( ich < AliMUONConstants::NTrackingCh() );
284 for ( Int_t i = 0; i < n; ++i )
286 AliMUONDigit* d = static_cast<AliMUONDigit*>(digits->UncheckedAt(i));
287 if ( trackingChamber )
289 ApplyResponseToTrackerDigit(*d,kAddNoise);
293 ApplyResponseToTriggerDigit(*d,fOutputData);
295 if ( d->Signal() <= 0 )
303 // The version below, using iterator, does not yet work (as the iterator
304 // assumes it is reading digits from the tree, while in this case it's
307 // AliMUONDigit* digit(0x0);
309 // // First loop on tracker digits
310 // AliMUONDataIterator tracker(fOutputData,"D",AliMUONDataIterator::kTrackingChambers);
312 // while ( ( digit = static_cast<AliMUONDigit*>(tracker.Next()) ) )
314 // ApplyResponseToTrackerDigit(*digit);
315 // if ( digit->Signal() <= 0 )
322 // // Then loop on trigger digits
323 // AliMUONDataIterator trigger(fOutputData,"D",AliMUONDataIterator::kTriggerChambers);
325 // while ( ( digit = static_cast<AliMUONDigit*>(trigger.Next()) ) )
327 // ApplyResponseToTriggerDigit(*digit,fOutputData);
328 // if ( digit->Signal() <= 0 )
335 //_____________________________________________________________________________
337 AliMUONDigitizerV3::AddOrUpdateDigit(TClonesArray& array,
338 const AliMUONDigit& digit)
340 /// Add or update a digit, depending on whether there's already a digit
341 /// for the corresponding channel.
343 Int_t ix = FindDigitIndex(array,digit);
347 AliMUONDigit* d = static_cast<AliMUONDigit*>(array.UncheckedAt(ix));
348 Bool_t ok = MergeDigits(digit,*d);
351 AliError("Digits are not mergeable !");
356 ix = array.GetLast() + 1;
357 new(array[ix]) AliMUONDigit(digit);
362 //_____________________________________________________________________________
364 AliMUONDigitizerV3::Exec(Option_t*)
367 /// We first loop over input files, and merge the sdigits we found there.
368 /// Second, we digitize all the resulting sdigits
369 /// Then we generate noise-only digits (for tracker only)
370 /// And we finally generate the trigger outputs.
372 AliDebug(1, "Running digitizer.");
374 if ( fManager->GetNinputs() == 0 )
376 AliWarning("No input set. Nothing to do.");
380 if ( !fIsInitialized )
382 AliError("Not initialized. Cannot perform the work. Sorry");
386 fExecTimer.Start(kFALSE);
388 Int_t nInputFiles = fManager->GetNinputs();
390 if ( fOutputData->TreeD() == 0x0 )
392 AliDebug(1,"Calling MakeDigitsContainer");
393 fOutputData->GetLoader()->MakeDigitsContainer();
395 fOutputData->MakeBranch("D,GLT");
396 fOutputData->SetTreeAddress("D,GLT");
398 // Loop over all the input files, and merge the sdigits found in those
400 for ( Int_t iFile = 0; iFile < nInputFiles; ++iFile )
402 AliMUONData* inputData = GetDataAccess(fManager->GetInputFolderName(iFile));
405 AliFatal(Form("Could not get access to input file #%d",iFile));
408 inputData->GetLoader()->LoadSDigits("READ");
409 inputData->SetTreeAddress("S");
410 inputData->GetSDigits();
412 MergeWithSDigits(*fOutputData,*inputData,fManager->GetMask(iFile));
414 inputData->ResetSDigits();
415 inputData->GetLoader()->UnloadSDigits();
419 // At this point, we do have digit arrays (one per chamber) which contains
420 // the merging of all the sdigits of the input file(s).
421 // We now massage them to apply the detector response, i.e. this
422 // is here that we do the "digitization" work.
426 if ( fGenerateNoisyDigits )
428 // Generate noise-only digits for tracker.
429 GenerateNoisyDigits();
432 // We generate the global and local trigger decisions.
433 fTriggerProcessor->ExecuteTask();
435 // Fill the output treeD
436 fOutputData->Fill("D,GLT");
438 // Write to the output tree(D).
439 // Please note that as GlobalTrigger, LocalTrigger and Digits are in the same
440 // tree (=TreeD) in different branches, this WriteDigits in fact writes all of
442 fOutputData->GetLoader()->WriteDigits("OVERWRITE");
444 // Finally, we clean up after ourselves.
445 fOutputData->ResetDigits();
446 fOutputData->ResetTrigger();
447 fOutputData->GetLoader()->UnloadDigits();
452 //_____________________________________________________________________________
454 AliMUONDigitizerV3::FindCorrespondingDigit(AliMUONDigit& digit,
455 AliMUONData* data) const
457 /// \todo add comment
459 AliMUONDataIterator it(data,"D",AliMUONDataIterator::kTriggerChambers);
463 cd = static_cast<AliMUONDigit*>(it.Next());
465 if (cd->DetElemId() == digit.DetElemId() &&
466 cd->PadX() == digit.PadX() &&
467 cd->PadY() == digit.PadY() &&
468 cd->Cathode() == digit.Cathode()){
472 //The corresponding digit is searched only forward in the AliMUONData.
473 //In this way when the first digit of the couple is given, the second digit is found and the efficiency is applied to both.
474 //Afterwards, when the second digit of the couple is given the first one is not found and hence efficiency is not applied again
476 while ( ( cd = static_cast<AliMUONDigit*>(it.Next()) ) )
478 if(!cd)continue;//avoid problems when 1 digit is removed
479 if ( cd->DetElemId() == digit.DetElemId() &&
480 cd->Hit() == digit.Hit() &&
481 cd->Cathode() != digit.Cathode() )
490 //_____________________________________________________________________________
492 AliMUONDigitizerV3::FindDigitIndex(TClonesArray& array,
493 const AliMUONDigit& digit) const
495 /// Return the index of digit within array, if that digit is there,
496 /// otherwise returns -1
498 /// \todo FIXME: this is of course not the best implementation you can think of.
499 /// Reconsider the use of hit/digit map... ? (but be sure it's needed!)
501 fFindDigitIndexTimer.Start(kFALSE);
503 Int_t n = array.GetEntriesFast();
504 for ( Int_t i = 0; i < n; ++i )
506 AliMUONDigit* d = static_cast<AliMUONDigit*>(array.UncheckedAt(i));
507 if ( d->DetElemId() == digit.DetElemId() &&
508 d->PadX() == digit.PadX() &&
509 d->PadY() == digit.PadY() &&
510 d->Cathode() == digit.Cathode() )
512 fFindDigitIndexTimer.Stop();
516 fFindDigitIndexTimer.Stop();
520 //_____________________________________________________________________________
522 AliMUONDigitizerV3::GenerateNoisyDigits()
524 /// According to a given probability, generate digits that
525 /// have a signal above the noise cut (ped+n*sigma_ped), i.e. digits
526 /// that are "only noise".
528 if ( !fNoiseFunction )
530 fNoiseFunction = new TF1("AliMUONDigitizerV3::fNoiseFunction","gaus",
531 fgkNSigmas,fgkNSigmas*10);
533 fNoiseFunction->SetParameters(1,0,1);
536 fGenerateNoisyDigitsTimer.Start(kFALSE);
538 for ( Int_t i = 0; i < AliMUONConstants::NTrackingCh(); ++i )
544 while ( !it.IsDone() )
546 for ( Int_t cathode = 0; cathode < 2; ++cathode )
548 GenerateNoisyDigitsForOneCathode(it.CurrentDE(),cathode);
554 fGenerateNoisyDigitsTimer.Stop();
557 //_____________________________________________________________________________
559 AliMUONDigitizerV3::GenerateNoisyDigitsForOneCathode(Int_t detElemId, Int_t cathode)
561 /// Generate noise-only digits for one cathode of one detection element.
562 /// Called by GenerateNoisyDigits()
564 Int_t chamberId = AliMpDEManager::GetChamberId(detElemId);
565 TClonesArray* digits = fOutputData->Digits(chamberId);
567 const AliMpVSegmentation* seg
568 = AliMpSegmentation::Instance()->GetMpSegmentation(detElemId,cathode);
569 Int_t nofPads = seg->NofPads();
571 Int_t maxIx = seg->MaxPadIndexX();
572 Int_t maxIy = seg->MaxPadIndexY();
574 static const Double_t kProbToBeOutsideNsigmas = TMath::Erfc(fgkNSigmas/TMath::Sqrt(2.0)) / 2. ;
576 Int_t nofNoisyPads = TMath::Nint(kProbToBeOutsideNsigmas*nofPads);
577 if ( !nofNoisyPads ) return;
580 TMath::Nint(gRandom->Gaus(nofNoisyPads,
581 nofNoisyPads/TMath::Sqrt(nofNoisyPads)));
583 AliDebug(3,Form("DE %d cath %d nofNoisyPads %d",detElemId,cathode,nofNoisyPads));
585 for ( Int_t i = 0; i < nofNoisyPads; ++i )
590 ix = gRandom->Integer(maxIx+1);
591 iy = gRandom->Integer(maxIy+1);
592 } while ( !seg->HasPad(AliMpIntPair(ix,iy)) );
594 d.SetDetElemId(detElemId);
595 d.SetCathode(cathode);
598 if ( FindDigitIndex(*digits,d) >= 0 )
600 // this digit is already there, and not noise-only, we simply skip it
603 AliMpPad pad = seg->PadByIndices(AliMpIntPair(ix,iy));
604 Int_t manuId = pad.GetLocation().GetFirst();
605 Int_t manuChannel = pad.GetLocation().GetSecond();
607 d.SetElectronics(manuId,manuChannel);
609 AliMUONVCalibParam* pedestals = fCalibrationData->Pedestals(detElemId,manuId);
611 Float_t pedestalMean = pedestals->ValueAsFloat(manuChannel,0);
612 Float_t pedestalSigma = pedestals->ValueAsFloat(manuChannel,1);
614 Double_t ped = fNoiseFunction->GetRandom()*pedestalSigma;
616 d.SetSignal(TMath::Nint(ped+pedestalMean+0.5));
617 d.SetPhysicsSignal(0);
619 AliDebug(3,Form("Adding a pure noise digit :"));
620 StdoutToAliDebug(3,cout << "Before Response: " << endl;
622 ApplyResponseToTrackerDigit(d,kFALSE);
623 if ( d.Signal() > 0 )
625 AddOrUpdateDigit(*digits,d);
629 AliError("Pure noise below threshold. This should not happen. Not adding "
632 StdoutToAliDebug(3,cout << "After Response: " << endl;
637 //_____________________________________________________________________________
639 AliMUONDigitizerV3::GetDataAccess(const TString& folderName)
641 /// Create an AliMUONData to deal with data found in folderName.
643 AliDebug(1,Form("Getting access to folder %s",folderName.Data()));
644 AliRunLoader* runLoader = AliRunLoader::GetRunLoader(folderName);
647 AliError(Form("Could not get RunLoader from folder %s",folderName.Data()));
650 AliLoader* loader = static_cast<AliLoader*>(runLoader->GetLoader("MUONLoader"));
653 AliError(Form("Could not get MuonLoader from folder %s",folderName.Data()));
656 AliMUONData* data = new AliMUONData(loader,"MUON","MUONDataForDigitOutput");
657 AliDebug(1,Form("AliMUONData=%p loader=%p",data,loader));
661 //_____________________________________________________________________________
663 AliMUONDigitizerV3::Init()
665 /// Initialization of the TTask :
666 /// a) set the outputData pointer
667 /// b) create the calibrationData, according to run number
668 /// c) create the trigger processing task
672 if ( fIsInitialized )
674 AliError("Object already initialized.");
680 AliError("fManager is null !");
684 fOutputData = GetDataAccess(fManager->GetOutputFolderName());
687 AliError("Can not perform digitization. I'm sorry");
690 AliDebug(1,Form("fOutputData=%p",fOutputData));
692 AliRunLoader* runLoader = fOutputData->GetLoader()->GetRunLoader();
693 AliRun* galice = runLoader->GetAliRun();
694 Int_t runnumber = galice->GetRunNumber();
696 fCalibrationData = new AliMUONCalibrationData(runnumber);
698 fTriggerProcessor = new AliMUONTriggerElectronics(fOutputData,fCalibrationData);
700 if ( muon()->GetTriggerEffCells() )
702 fTriggerEfficiency = fCalibrationData->TriggerEfficiency();
703 if ( fTriggerEfficiency )
705 AliDebug(1, "Will apply trigger efficiency");
709 AliError("I was requested to apply trigger efficiency, but I could "
714 if ( fGenerateNoisyDigits )
716 AliDebug(1, "Will generate noise-only digits for tracker");
719 fIsInitialized = kTRUE;
723 //_____________________________________________________________________________
725 AliMUONDigitizerV3::MergeDigits(const AliMUONDigit& src,
726 AliMUONDigit& srcAndDest)
728 /// Merge 2 digits (src and srcAndDest) into srcAndDest.
730 AliDebug(1,"Merging the following digits:");
731 StdoutToAliDebug(1,src.Print("tracks"););
732 StdoutToAliDebug(1,srcAndDest.Print("tracks"););
734 Bool_t check = ( src.DetElemId() == srcAndDest.DetElemId() &&
735 src.PadX() == srcAndDest.PadX() &&
736 src.PadY() == srcAndDest.PadY() &&
737 src.Cathode() == srcAndDest.Cathode() );
743 srcAndDest.AddSignal(src.Signal());
744 srcAndDest.AddPhysicsSignal(src.Physics());
745 for ( Int_t i = 0; i < src.Ntracks(); ++i )
747 srcAndDest.AddTrack(src.Track(i),src.TrackCharge(i));
749 StdoutToAliDebug(1,cout << "result:"; srcAndDest.Print("tracks"););
753 //_____________________________________________________________________________
755 AliMUONDigitizerV3::MergeWithSDigits(AliMUONData& outputData,
756 const AliMUONData& inputData, Int_t mask)
758 /// Merge the sdigits in inputData with the digits already present in outputData
762 for ( Int_t ich = 0; ich < AliMUONConstants::NCh(); ++ich )
764 TClonesArray* iDigits = inputData.SDigits(ich);
765 TClonesArray* oDigits = outputData.Digits(ich);
768 AliError(Form("Could not get sdigits for ich=%d",ich));
771 Int_t nSDigits = iDigits->GetEntriesFast();
772 for ( Int_t k = 0; k < nSDigits; ++k )
774 AliMUONDigit* sdigit = static_cast<AliMUONDigit*>(iDigits->UncheckedAt(k));
777 AliError(Form("Could not get sdigit for ich=%d and k=%d",ich,k));
781 // Update the track references using the mask.
782 // FIXME: this is dirty, for backward compatibility only.
783 // Should re-design all this way of keeping track of MC information...
784 if ( mask ) sdigit->PatchTracks(mask);
785 // Then add or update the digit to the output.
786 AddOrUpdateDigit(*oDigits,*sdigit);