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1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * |
3 | * * |
4 | * Author: The ALICE Off-line Project. * |
5 | * Contributors are mentioned in the code where appropriate. * |
6 | * * |
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 | **************************************************************************/ |
15 | |
16 | // $Id$ |
17 | |
18 | #include "AliMUONDigitCalibrator.h" |
19 | |
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20 | #include "AliLog.h" |
21 | #include "AliMUONCalibrationData.h" |
22 | #include "AliMUONConstants.h" |
23 | #include "AliMUONData.h" |
24 | #include "AliMUONDigit.h" |
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25 | #include "AliMUONVCalibParam.h" |
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26 | #include "TClonesArray.h" |
27 | |
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28 | /// |
29 | /// Class used to calibrate digits (either real or simulated ones). |
30 | /// |
31 | /// The calibration consists of subtracting the pedestal |
32 | /// and multiplying by a gain, so that |
33 | /// Signal = (ADC-pedestal)*gain |
34 | /// |
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 |
41 | /// bad digits). |
42 | /// |
43 | |
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44 | ClassImp(AliMUONDigitCalibrator) |
45 | |
46 | //_____________________________________________________________________________ |
47 | AliMUONDigitCalibrator::AliMUONDigitCalibrator(AliMUONData* muonData, |
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48 | AliMUONCalibrationData* calib) |
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49 | : TTask("AliMUONDigitCalibrator","Subtract pedestal from digit charge"), |
50 | fData(muonData), |
51 | fCalibrationData(calib) |
52 | { |
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53 | // |
54 | // ctor. This class need the muonData to get access to the digit, |
55 | // and the calibrationData to get access to calibration parameters. |
56 | // |
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57 | } |
58 | |
59 | //_____________________________________________________________________________ |
60 | AliMUONDigitCalibrator::~AliMUONDigitCalibrator() |
61 | { |
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62 | // |
63 | // empty dtor. |
64 | // |
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65 | } |
66 | |
67 | //_____________________________________________________________________________ |
68 | void |
69 | AliMUONDigitCalibrator::Exec(Option_t*) |
70 | { |
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71 | // |
72 | // Main method. |
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. |
78 | |
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79 | for ( Int_t ch = 0; ch < AliMUONConstants::NTrackingCh(); ++ch ) |
80 | { |
81 | TClonesArray* digitArray = fData->Digits(ch); |
82 | Int_t nDigits = digitArray->GetEntriesFast(); |
83 | for ( Int_t d = 0; d < nDigits; ++d ) |
84 | { |
85 | AliMUONDigit* digit = |
86 | static_cast<AliMUONDigit*>(digitArray->UncheckedAt(d)); |
87 | |
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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*> |
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91 | (fCalibrationData->DeadChannels(digit->DetElemId(),digit->ManuId())); |
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92 | if ( dead && dead->ValueAsInt(digit->ManuChannel()) ) |
93 | { |
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94 | AliWarning(Form("Removing dead channel detElemId %d manuId %d " |
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95 | "manuChannel %d",digit->DetElemId(),digit->ManuId(), |
96 | digit->ManuChannel())); |
97 | digit->SetSignal(0); |
98 | continue; |
99 | } |
100 | |
101 | // If the channel is good, go on with the calibration itself. |
102 | |
103 | AliMUONVCalibParam* pedestal = static_cast<AliMUONVCalibParam*> |
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104 | (fCalibrationData->Pedestals(digit->DetElemId(),digit->ManuId())); |
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105 | |
106 | AliMUONVCalibParam* gain = static_cast<AliMUONVCalibParam*> |
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107 | (fCalibrationData->Gains(digit->DetElemId(),digit->ManuId())); |
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108 | |
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109 | if (!pedestal) |
110 | { |
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111 | AliFatal(Form("Got a null ped object for DE,manu=%d,%d", |
112 | digit->DetElemId(),digit->ManuId())); |
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113 | |
114 | } |
115 | if (!gain) |
116 | { |
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117 | AliFatal(Form("Got a null gain object for DE,manu=%d,%d", |
118 | digit->DetElemId(),digit->ManuId())); |
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119 | } |
120 | |
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121 | Int_t manuChannel = digit->ManuChannel(); |
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122 | Int_t adc = digit->Signal(); |
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123 | Float_t padc = adc-pedestal->ValueAsFloat(manuChannel,0); |
124 | if ( padc < 3.0*pedestal->ValueAsFloat(manuChannel,1) ) |
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125 | { |
126 | padc = 0.0; |
127 | } |
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128 | Float_t charge = padc*gain->ValueAsFloat(manuChannel,0); |
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129 | Int_t signal = TMath::Nint(charge); |
130 | digit->SetSignal(signal); |
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131 | Int_t saturation = gain->ValueAsInt(manuChannel,1); |
132 | if ( signal >= saturation ) |
133 | { |
134 | digit->Saturated(kTRUE); |
135 | } |
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136 | } |
137 | } |
138 | } |