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 "AliMUONDigitCalibrator.h"
21 #include "AliMUONCalibrationData.h"
22 #include "AliMUONConstants.h"
23 #include "AliMUONData.h"
24 #include "AliMUONDigit.h"
25 #include "AliMUONVCalibParam.h"
26 #include "TClonesArray.h"
29 /// Class used to calibrate digits (either real or simulated ones).
31 /// The calibration consists of subtracting the pedestal
32 /// and multiplying by a gain, so that
33 /// Signal = (ADC-pedestal)*gain
35 /// Please note also that for the moment, if a digit lies on a dead channel
36 /// we remove this digit from the list of digits.
37 /// FIXME: this has to be revisited. By using the AliMUONDigit::fFlags we
38 /// should in principle flag a digit as bad w/o removing it, but this
39 /// then requires some changes in the cluster finder to deal with this extra
40 /// information correctly (e.g. to set a quality for the cluster if it contains
44 ClassImp(AliMUONDigitCalibrator)
46 //_____________________________________________________________________________
47 AliMUONDigitCalibrator::AliMUONDigitCalibrator(AliMUONData* muonData,
48 AliMUONCalibrationData* calib)
49 : TTask("AliMUONDigitCalibrator","Subtract pedestal from digit charge"),
51 fCalibrationData(calib)
54 // ctor. This class need the muonData to get access to the digit,
55 // and the calibrationData to get access to calibration parameters.
59 //_____________________________________________________________________________
60 AliMUONDigitCalibrator::~AliMUONDigitCalibrator()
67 //_____________________________________________________________________________
69 AliMUONDigitCalibrator::Exec(Option_t*)
73 // We loop on tracking chambers (i.e. we do nothing for trigger)
74 // and for each digit in that chamber, we calibrate it :
75 // a) if the corresponding channel is known to be bad, we set the signal to 0
76 // (so that digit can be suppressed later on)
77 // b) we then apply pedestal and gain corrections.
79 for ( Int_t ch = 0; ch < AliMUONConstants::NTrackingCh(); ++ch )
81 TClonesArray* digitArray = fData->Digits(ch);
82 Int_t nDigits = digitArray->GetEntriesFast();
83 for ( Int_t d = 0; d < nDigits; ++d )
86 static_cast<AliMUONDigit*>(digitArray->UncheckedAt(d));
88 // Very first check is whether this channel is known to be bad,
89 // in which case we set the signal to zero.
90 AliMUONVCalibParam* dead = static_cast<AliMUONVCalibParam*>
91 (fCalibrationData->DeadChannels(digit->DetElemId(),digit->ManuId()));
92 if ( dead && dead->ValueAsInt(digit->ManuChannel()) )
94 AliWarning(Form("Removing dead channel detElemId %d manuId %d "
95 "manuChannel %d",digit->DetElemId(),digit->ManuId(),
96 digit->ManuChannel()));
101 // If the channel is good, go on with the calibration itself.
103 AliMUONVCalibParam* pedestal = static_cast<AliMUONVCalibParam*>
104 (fCalibrationData->Pedestals(digit->DetElemId(),digit->ManuId()));
106 AliMUONVCalibParam* gain = static_cast<AliMUONVCalibParam*>
107 (fCalibrationData->Gains(digit->DetElemId(),digit->ManuId()));
111 AliFatal(Form("Got a null ped object for DE,manu=%d,%d",
112 digit->DetElemId(),digit->ManuId()));
117 AliFatal(Form("Got a null gain object for DE,manu=%d,%d",
118 digit->DetElemId(),digit->ManuId()));
121 Int_t manuChannel = digit->ManuChannel();
122 Int_t adc = digit->Signal();
123 Float_t padc = adc-pedestal->ValueAsFloat(manuChannel,0);
124 if ( padc < 3.0*pedestal->ValueAsFloat(manuChannel,1) )
128 Float_t charge = padc*gain->ValueAsFloat(manuChannel,0);
129 Int_t signal = TMath::Nint(charge);
130 digit->SetSignal(signal);
131 Int_t saturation = gain->ValueAsInt(manuChannel,1);
132 if ( signal >= saturation )
134 digit->Saturated(kTRUE);