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"
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"
31 #include "AliMpDEIterator.h"
32 #include "AliMpDEManager.h"
33 #include "AliMpIntPair.h"
35 #include "AliMpStationType.h"
36 #include "AliMpVSegmentation.h"
37 #include "AliMpDEManager.h"
39 #include "AliRunDigitizer.h"
40 #include "AliRunLoader.h"
41 #include "Riostream.h"
47 /// The digitizer is performing the transformation to go from SDigits (digits
48 /// w/o any electronic noise) to Digits (w/ electronic noise, and decalibration)
50 /// The decalibration is performed by doing the reverse operation of the
51 /// calibration, that is we do (Signal+pedestal)/gain -> ADC
53 /// Note also that the digitizer takes care of merging sdigits that belongs
54 /// to the same pad, either because we're merging several input sdigit files
55 /// or with a single file because the sdigitizer does not merge sdigits itself
56 /// (for performance reason mainly, and because anyway we know we have to do it
57 /// here, at the digitization level).
64 return static_cast<AliMUON*>(gAlice->GetModule("MUON"));
67 AliMUONSegmentation* Segmentation()
69 static AliMUONSegmentation* segmentation = muon()->GetSegmentation();
74 const Double_t AliMUONDigitizerV3::fgkNSigmas=3;
76 ClassImp(AliMUONDigitizerV3)
78 //_____________________________________________________________________________
79 AliMUONDigitizerV3::AliMUONDigitizerV3(AliRunDigitizer* manager,
80 Bool_t generateNoisyDigits)
81 : AliDigitizer(manager),
82 fIsInitialized(kFALSE),
84 fCalibrationData(0x0),
85 fTriggerProcessor(0x0),
86 fTriggerEfficiency(0x0),
87 fFindDigitIndexTimer(),
88 fGenerateNoisyDigitsTimer(),
91 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()
106 // Dtor. Note we're the owner of some pointers.
111 delete fCalibrationData;
112 delete fTriggerProcessor;
113 delete fNoiseFunction;
115 AliDebug(1, Form("Execution time for FindDigitIndex() : R:%.2fs C:%.2fs",
116 fFindDigitIndexTimer.RealTime(),fFindDigitIndexTimer.CpuTime()));
117 if ( fGenerateNoisyDigits )
119 AliDebug(1, Form("Execution time for GenerateNoisyDigits() : R:%.2fs C:%.2fs",
120 fGenerateNoisyDigitsTimer.RealTime(),
121 fGenerateNoisyDigitsTimer.CpuTime()));
123 AliDebug(1, Form("Execution time for Exec() : R:%.2fs C:%.2fs",
124 fExecTimer.RealTime(),fExecTimer.CpuTime()));
128 //_____________________________________________________________________________
130 AliMUONDigitizerV3::ApplyResponseToTrackerDigit(AliMUONDigit& digit, Bool_t addNoise)
132 // For tracking digits, starting from an ideal digit's charge, we :
134 // - add some noise (thus leading to a realistic charge), if requested to do so
135 // - divide by a gain (thus decalibrating the digit)
136 // - add a pedestal (thus decalibrating the digit)
137 // - 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 if ( !fTriggerEfficiency ) return;
211 AliMUONDigit* correspondingDigit = FindCorrespondingDigit(digit,data);
213 if(!correspondingDigit)return;//reject bad correspondences
215 Int_t detElemId = digit.DetElemId();
217 const AliMpVSegmentation* segment[2] =
219 Segmentation()->GetMpSegmentation(detElemId,digit.Cathode()),
220 Segmentation()->GetMpSegmentation(detElemId,correspondingDigit->Cathode())
225 segment[0]->PadByIndices(AliMpIntPair(digit.PadX(),digit.PadY()),kTRUE),
226 segment[1]->PadByIndices(AliMpIntPair(correspondingDigit->PadX(),correspondingDigit->PadY()),kTRUE)
232 if (digit.Cathode()==0)
238 Float_t x = pad[ix].Position().X();
239 Float_t y = pad[iy].Position().Y();
240 if ( x==-1 && y==-1 )
244 AliError(Form("Got an unknown position for a digit in DE %d at (ix,iy)=(%d,%d)",
245 detElemId,pad[ix].GetIndices().GetFirst(),pad[iy].GetIndices().GetSecond()));
247 Float_t x0 = segment[0]->Dimensions().X();
248 Float_t y0 = segment[1]->Dimensions().Y();
249 TVector2 newCoord = fTriggerEfficiency->ChangeReferenceFrame(x, y, x0, y0);
252 fTriggerEfficiency->IsTriggered(detElemId, newCoord.Px(), newCoord.Py(),
253 isTrig[0], isTrig[1]);
255 if (!isTrig[digit.Cathode()])
260 if ( &digit != correspondingDigit )
262 if (!isTrig[correspondingDigit->Cathode()])
264 correspondingDigit->SetSignal(0);
269 //_____________________________________________________________________________
271 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)
341 // Add or update a digit, depending on whether there's already a digit
342 // for the corresponding channel.
344 Int_t ix = FindDigitIndex(array,digit);
348 AliMUONDigit* d = static_cast<AliMUONDigit*>(array.UncheckedAt(ix));
349 Bool_t ok = MergeDigits(digit,*d);
352 AliError("Digits are not mergeable !");
357 ix = array.GetLast() + 1;
358 new(array[ix]) AliMUONDigit(digit);
363 //_____________________________________________________________________________
365 AliMUONDigitizerV3::Exec(Option_t*)
369 // We first loop over input files, and merge the sdigits we found there.
370 // Second, we digitize all the resulting sdigits
371 // Then we generate noise-only digits (for tracker only)
372 // And we finally generate the trigger outputs.
375 AliDebug(1, "Running digitizer.");
377 if ( fManager->GetNinputs() == 0 )
379 AliWarning("No input set. Nothing to do.");
383 if ( !fIsInitialized )
385 AliError("Not initialized. Cannot perform the work. Sorry");
389 fExecTimer.Start(kFALSE);
391 Int_t nInputFiles = fManager->GetNinputs();
393 if ( fOutputData->TreeD() == 0x0 )
395 AliDebug(1,"Calling MakeDigitsContainer");
396 fOutputData->GetLoader()->MakeDigitsContainer();
398 fOutputData->MakeBranch("D,GLT");
399 fOutputData->SetTreeAddress("D,GLT");
401 // Loop over all the input files, and merge the sdigits found in those
403 for ( Int_t iFile = 0; iFile < nInputFiles; ++iFile )
405 AliMUONData* inputData = GetDataAccess(fManager->GetInputFolderName(iFile));
408 AliFatal(Form("Could not get access to input file #%d",iFile));
411 inputData->GetLoader()->LoadSDigits("READ");
412 inputData->SetTreeAddress("S");
413 inputData->GetSDigits();
415 MergeWithSDigits(*fOutputData,*inputData,fManager->GetMask(iFile));
417 inputData->ResetSDigits();
418 inputData->GetLoader()->UnloadSDigits();
422 // At this point, we do have digit arrays (one per chamber) which contains
423 // the merging of all the sdigits of the input file(s).
424 // We now massage them to apply the detector response, i.e. this
425 // is here that we do the "digitization" work.
429 if ( fGenerateNoisyDigits )
431 // Generate noise-only digits for tracker.
432 GenerateNoisyDigits();
435 // We generate the global and local trigger decisions.
436 fTriggerProcessor->ExecuteTask();
438 // Fill the output treeD
439 fOutputData->Fill("D,GLT");
441 // Write to the output tree(D).
442 // Please note that as GlobalTrigger, LocalTrigger and Digits are in the same
443 // tree (=TreeD) in different branches, this WriteDigits in fact writes all of
445 fOutputData->GetLoader()->WriteDigits("OVERWRITE");
447 // Finally, we clean up after ourselves.
448 fOutputData->ResetDigits();
449 fOutputData->ResetTrigger();
450 fOutputData->GetLoader()->UnloadDigits();
455 //_____________________________________________________________________________
457 AliMUONDigitizerV3::FindCorrespondingDigit(AliMUONDigit& digit,
458 AliMUONData* data) const
460 AliMUONDataIterator it(data,"D",AliMUONDataIterator::kTriggerChambers);
464 cd = static_cast<AliMUONDigit*>(it.Next());
466 if (cd->DetElemId() == digit.DetElemId() &&
467 cd->PadX() == digit.PadX() &&
468 cd->PadY() == digit.PadY() &&
469 cd->Cathode() == digit.Cathode()){
473 //The corresponding digit is searched only forward in the AliMUONData.
474 //In this way when the first digit of the couple is given, the second digit is found and the efficiency is applied to both.
475 //Afterwards, when the second digit of the couple is given the first one is not found and hence efficiency is not applied again
477 while ( ( cd = static_cast<AliMUONDigit*>(it.Next()) ) )
479 if(!cd)continue;//avoid problems when 1 digit is removed
480 if ( cd->DetElemId() == digit.DetElemId() &&
481 cd->Hit() == digit.Hit() &&
482 cd->Cathode() != digit.Cathode() )
491 //_____________________________________________________________________________
493 AliMUONDigitizerV3::FindDigitIndex(TClonesArray& array,
494 const AliMUONDigit& digit) const
497 // Return the index of digit within array, if that digit is there,
498 // otherwise returns -1
500 // FIXME: this is of course not the best implementation you can think of.
501 // Reconsider the use of hit/digit map... ? (but be sure it's needed!)
504 fFindDigitIndexTimer.Start(kFALSE);
506 Int_t n = array.GetEntriesFast();
507 for ( Int_t i = 0; i < n; ++i )
509 AliMUONDigit* d = static_cast<AliMUONDigit*>(array.UncheckedAt(i));
510 if ( d->DetElemId() == digit.DetElemId() &&
511 d->PadX() == digit.PadX() &&
512 d->PadY() == digit.PadY() &&
513 d->Cathode() == digit.Cathode() )
515 fFindDigitIndexTimer.Stop();
519 fFindDigitIndexTimer.Stop();
523 //_____________________________________________________________________________
525 AliMUONDigitizerV3::GenerateNoisyDigits()
528 // According to a given probability, generate digits that
529 // have a signal above the noise cut (ped+n*sigma_ped), i.e. digits
530 // that are "only noise".
533 if ( !fNoiseFunction )
535 fNoiseFunction = new TF1("AliMUONDigitizerV3::fNoiseFunction","gaus",
536 fgkNSigmas,fgkNSigmas*10);
538 fNoiseFunction->SetParameters(1,0,1);
541 fGenerateNoisyDigitsTimer.Start(kFALSE);
543 for ( Int_t i = 0; i < AliMUONConstants::NTrackingCh(); ++i )
549 while ( !it.IsDone() )
551 for ( Int_t cathode = 0; cathode < 2; ++cathode )
553 GenerateNoisyDigitsForOneCathode(it.CurrentDE(),cathode);
559 fGenerateNoisyDigitsTimer.Stop();
562 //_____________________________________________________________________________
564 AliMUONDigitizerV3::GenerateNoisyDigitsForOneCathode(Int_t detElemId, Int_t cathode)
567 // Generate noise-only digits for one cathode of one detection element.
568 // Called by GenerateNoisyDigits()
571 Int_t chamberId = AliMpDEManager::GetChamberId(detElemId);
572 TClonesArray* digits = fOutputData->Digits(chamberId);
574 const AliMpVSegmentation* seg = Segmentation()->GetMpSegmentation(detElemId,cathode);
575 Int_t nofPads = seg->NofPads();
577 Int_t maxIx = seg->MaxPadIndexX();
578 Int_t maxIy = seg->MaxPadIndexY();
580 static const Double_t kProbToBeOutsideNsigmas = TMath::Erfc(fgkNSigmas/TMath::Sqrt(2.0)) / 2. ;
582 Int_t nofNoisyPads = TMath::Nint(kProbToBeOutsideNsigmas*nofPads);
583 if ( !nofNoisyPads ) return;
586 TMath::Nint(gRandom->Gaus(nofNoisyPads,
587 nofNoisyPads/TMath::Sqrt(nofNoisyPads)));
589 AliDebug(3,Form("DE %d cath %d nofNoisyPads %d",detElemId,cathode,nofNoisyPads));
591 for ( Int_t i = 0; i < nofNoisyPads; ++i )
596 ix = gRandom->Integer(maxIx+1);
597 iy = gRandom->Integer(maxIy+1);
598 } while ( !seg->HasPad(AliMpIntPair(ix,iy)) );
600 d.SetDetElemId(detElemId);
601 d.SetCathode(cathode);
604 if ( FindDigitIndex(*digits,d) >= 0 )
606 // this digit is already there, and not noise-only, we simply skip it
609 AliMpPad pad = seg->PadByIndices(AliMpIntPair(ix,iy));
610 Int_t manuId = pad.GetLocation().GetFirst();
611 Int_t manuChannel = pad.GetLocation().GetSecond();
613 d.SetElectronics(manuId,manuChannel);
615 AliMUONVCalibParam* pedestals = fCalibrationData->Pedestals(detElemId,manuId);
617 Float_t pedestalMean = pedestals->ValueAsFloat(manuChannel,0);
618 Float_t pedestalSigma = pedestals->ValueAsFloat(manuChannel,1);
620 Double_t ped = fNoiseFunction->GetRandom()*pedestalSigma;
622 d.SetSignal(TMath::Nint(ped+pedestalMean+0.5));
623 d.SetPhysicsSignal(0);
625 AliDebug(3,Form("Adding a pure noise digit :"));
626 StdoutToAliDebug(3,cout << "Before Response: " << endl;
628 ApplyResponseToTrackerDigit(d,kFALSE);
629 if ( d.Signal() > 0 )
631 AddOrUpdateDigit(*digits,d);
635 AliError("Pure noise below threshold. This should not happen. Not adding "
638 StdoutToAliDebug(3,cout << "After Response: " << endl;
643 //_____________________________________________________________________________
645 AliMUONDigitizerV3::GetDataAccess(const TString& folderName)
648 // Create an AliMUONData to deal with data found in folderName.
650 AliDebug(1,Form("Getting access to folder %s",folderName.Data()));
651 AliRunLoader* runLoader = AliRunLoader::GetRunLoader(folderName);
654 AliError(Form("Could not get RunLoader from folder %s",folderName.Data()));
657 AliLoader* loader = static_cast<AliLoader*>(runLoader->GetLoader("MUONLoader"));
660 AliError(Form("Could not get MuonLoader from folder %s",folderName.Data()));
663 AliMUONData* data = new AliMUONData(loader,"MUON","MUONDataForDigitOutput");
664 AliDebug(1,Form("AliMUONData=%p loader=%p",data,loader));
668 //_____________________________________________________________________________
670 AliMUONDigitizerV3::Init()
673 // Initialization of the TTask :
674 // a) set the outputData pointer
675 // b) create the calibrationData, according to run number
676 // c) create the trigger processing task
680 if ( fIsInitialized )
682 AliError("Object already initialized.");
688 AliError("fManager is null !");
692 fOutputData = GetDataAccess(fManager->GetOutputFolderName());
695 AliError("Can not perform digitization. I'm sorry");
698 AliDebug(1,Form("fOutputData=%p",fOutputData));
700 AliRunLoader* runLoader = fOutputData->GetLoader()->GetRunLoader();
701 AliRun* galice = runLoader->GetAliRun();
702 Int_t runnumber = galice->GetRunNumber();
704 fCalibrationData = new AliMUONCalibrationData(runnumber);
706 fTriggerProcessor = new AliMUONTriggerElectronics(fOutputData,fCalibrationData);
708 if ( muon()->GetTriggerEffCells() )
710 fTriggerEfficiency = fCalibrationData->TriggerEfficiency();
711 if ( fTriggerEfficiency )
713 AliDebug(1, "Will apply trigger efficiency");
717 AliError("I was requested to apply trigger efficiency, but I could "
722 if ( fGenerateNoisyDigits )
724 AliDebug(1, "Will generate noise-only digits for tracker");
727 fIsInitialized = kTRUE;
731 //_____________________________________________________________________________
733 AliMUONDigitizerV3::MergeDigits(const AliMUONDigit& src,
734 AliMUONDigit& srcAndDest)
737 // Merge 2 digits (src and srcAndDest) into srcAndDest.
739 AliDebug(1,"Merging the following digits:");
740 StdoutToAliDebug(1,src.Print("tracks"););
741 StdoutToAliDebug(1,srcAndDest.Print("tracks"););
743 Bool_t check = ( src.DetElemId() == srcAndDest.DetElemId() &&
744 src.PadX() == srcAndDest.PadX() &&
745 src.PadY() == srcAndDest.PadY() &&
746 src.Cathode() == srcAndDest.Cathode() );
752 srcAndDest.AddSignal(src.Signal());
753 srcAndDest.AddPhysicsSignal(src.Physics());
754 for ( Int_t i = 0; i < src.Ntracks(); ++i )
756 srcAndDest.AddTrack(src.Track(i),src.TrackCharge(i));
758 StdoutToAliDebug(1,cout << "result:"; srcAndDest.Print("tracks"););
762 //_____________________________________________________________________________
764 AliMUONDigitizerV3::MergeWithSDigits(AliMUONData& outputData,
765 const AliMUONData& inputData, Int_t mask)
768 // Merge the sdigits in inputData with the digits already present in outputData
772 for ( Int_t ich = 0; ich < AliMUONConstants::NCh(); ++ich )
774 TClonesArray* iDigits = inputData.SDigits(ich);
775 TClonesArray* oDigits = outputData.Digits(ich);
778 AliError(Form("Could not get sdigits for ich=%d",ich));
781 Int_t nSDigits = iDigits->GetEntriesFast();
782 for ( Int_t k = 0; k < nSDigits; ++k )
784 AliMUONDigit* sdigit = static_cast<AliMUONDigit*>(iDigits->UncheckedAt(k));
787 AliError(Form("Could not get sdigit for ich=%d and k=%d",ich,k));
791 // Update the track references using the mask.
792 // FIXME: this is dirty, for backward compatibility only.
793 // Should re-design all this way of keeping track of MC information...
794 if ( mask ) sdigit->PatchTracks(mask);
795 // Then add or update the digit to the output.
796 AddOrUpdateDigit(*oDigits,*sdigit);