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379c5c09 | 1 | /************************************************************************** |
2 | * Copyright(c) 2007, 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 | // This class extracts the signal parameters (energy, time, quality) | |
19 | // from ALTRO samples. Energy is in ADC counts, time is in time bin units. | |
20 | // A coarse algorithm takes the energy as the maximum | |
21 | // sample, time is the first sample index, and the quality is the number | |
22 | // of bunches in the signal. | |
23 | // | |
24 | // AliPHOSRawFitterv0 *fitterv0=new AliPHOSRawFitterv0(); | |
379c5c09 | 25 | // fitterv0->SetChannelGeo(module,cellX,cellZ,caloFlag); |
26 | // fitterv0->SetCalibData(fgCalibData) ; | |
1dfadc32 | 27 | // fitterv0->Eval(sig,sigStart,sigLength); |
379c5c09 | 28 | // Double_t amplitude = fitterv0.GetEnergy(); |
29 | // Double_t time = fitterv0.GetTime(); | |
30 | // Bool_t isLowGain = fitterv0.GetCaloFlag()==0; | |
31 | ||
32 | // Author: Yuri Kharlov | |
33 | ||
34 | // --- ROOT system --- | |
35 | #include "TArrayI.h" | |
36 | #include "TMath.h" | |
37 | #include "TObject.h" | |
38 | ||
39 | // --- AliRoot header files --- | |
40 | #include "AliPHOSRawFitterv0.h" | |
41 | #include "AliPHOSCalibData.h" | |
42 | #include "AliLog.h" | |
43 | ||
44 | ClassImp(AliPHOSRawFitterv0) | |
45 | ||
46 | //----------------------------------------------------------------------------- | |
47 | AliPHOSRawFitterv0::AliPHOSRawFitterv0(): | |
48 | TObject(), | |
379c5c09 | 49 | fModule(0), |
50 | fCellX(0), | |
51 | fCellZ(0), | |
52 | fCaloFlag(0), | |
379c5c09 | 53 | fNBunches(0), |
54 | fPedSubtract(kFALSE), | |
55 | fEnergy(-111), | |
56 | fTime(-111), | |
57 | fQuality(0.), | |
58 | fPedestalRMS(0.), | |
59 | fAmpOffset(0), | |
60 | fAmpThreshold(0), | |
61 | fOverflow(kFALSE), | |
62 | fCalibData(0) | |
63 | { | |
64 | //Default constructor | |
65 | } | |
66 | ||
67 | //----------------------------------------------------------------------------- | |
68 | AliPHOSRawFitterv0::~AliPHOSRawFitterv0() | |
69 | { | |
70 | //Destructor | |
379c5c09 | 71 | } |
72 | ||
73 | //----------------------------------------------------------------------------- | |
74 | AliPHOSRawFitterv0::AliPHOSRawFitterv0(const AliPHOSRawFitterv0 &phosFitter ): | |
75 | TObject(), | |
379c5c09 | 76 | fModule (phosFitter.fModule), |
77 | fCellX (phosFitter.fCellX), | |
78 | fCellZ (phosFitter.fCellZ), | |
79 | fCaloFlag (phosFitter.fCaloFlag), | |
379c5c09 | 80 | fNBunches (phosFitter.fNBunches), |
81 | fPedSubtract (phosFitter.fPedSubtract), | |
82 | fEnergy (phosFitter.fEnergy), | |
83 | fTime (phosFitter.fTime), | |
84 | fQuality (phosFitter.fQuality), | |
85 | fPedestalRMS (phosFitter.fPedestalRMS), | |
86 | fAmpOffset (phosFitter.fAmpOffset), | |
87 | fAmpThreshold(phosFitter.fAmpThreshold), | |
88 | fOverflow (phosFitter.fOverflow), | |
89 | fCalibData (phosFitter.fCalibData) | |
90 | { | |
91 | //Copy constructor | |
92 | } | |
93 | ||
94 | //----------------------------------------------------------------------------- | |
95 | AliPHOSRawFitterv0& AliPHOSRawFitterv0::operator = (const AliPHOSRawFitterv0 &phosFitter) | |
96 | { | |
97 | //Assignment operator. | |
98 | ||
99 | if(this != &phosFitter) { | |
379c5c09 | 100 | fModule = phosFitter.fModule; |
101 | fCellX = phosFitter.fCellX; | |
102 | fCellZ = phosFitter.fCellZ; | |
103 | fCaloFlag = phosFitter.fCaloFlag; | |
379c5c09 | 104 | fNBunches = phosFitter.fNBunches; |
105 | fPedSubtract = phosFitter.fPedSubtract; | |
106 | fEnergy = phosFitter.fEnergy; | |
107 | fTime = phosFitter.fTime; | |
108 | fQuality = phosFitter.fQuality; | |
109 | fPedestalRMS = phosFitter.fPedestalRMS; | |
110 | fAmpOffset = phosFitter.fAmpOffset; | |
111 | fAmpThreshold = phosFitter.fAmpThreshold; | |
112 | fOverflow = phosFitter.fOverflow; | |
113 | fCalibData = phosFitter.fCalibData; | |
114 | } | |
115 | ||
116 | return *this; | |
117 | } | |
118 | ||
119 | //----------------------------------------------------------------------------- | |
120 | ||
379c5c09 | 121 | void AliPHOSRawFitterv0::SetChannelGeo(const Int_t module, const Int_t cellX, |
122 | const Int_t cellZ, const Int_t caloFlag) | |
123 | { | |
124 | // Set geometry address of the channel | |
125 | // (for a case if fitting parameters are different for different channels) | |
126 | ||
127 | fModule = module; | |
128 | fCellX = cellX; | |
129 | fCellZ = cellZ; | |
130 | fCaloFlag = caloFlag; | |
131 | } | |
132 | //----------------------------------------------------------------------------- | |
133 | ||
fc5cc4cd | 134 | Bool_t AliPHOSRawFitterv0::Eval(const UShort_t *signal, Int_t sigStart, Int_t sigLength) |
379c5c09 | 135 | { |
136 | // Calculate signal parameters (energy, time, quality) from array of samples | |
137 | // Energy is a maximum sample minus pedestal 9 | |
138 | // Time is the first time bin | |
139 | // Signal overflows is there are at least 3 samples of the same amplitude above 900 | |
140 | ||
141 | fEnergy = 0; | |
142 | if (fNBunches > 1) { | |
143 | fQuality = 1000; | |
144 | return kTRUE; | |
145 | } | |
146 | ||
147 | const Float_t kBaseLine = 1.0; | |
148 | const Int_t kPreSamples = 10; | |
149 | ||
150 | Float_t pedMean = 0; | |
151 | Float_t pedRMS = 0; | |
152 | Int_t nPed = 0; | |
153 | UShort_t maxSample = 0; | |
154 | Int_t nMax = 0; | |
155 | ||
92236b27 | 156 | for (Int_t i=0; i<sigLength; i++) { |
fc5cc4cd | 157 | if (i>sigLength-kPreSamples) { //inverse signal time order |
379c5c09 | 158 | nPed++; |
92236b27 | 159 | pedMean += signal[i]; |
160 | pedRMS += signal[i]*signal[i] ; | |
379c5c09 | 161 | } |
92236b27 | 162 | if(signal[i] > maxSample) maxSample = signal[i]; |
163 | if(signal[i] == maxSample) nMax++; | |
a85e6165 | 164 | |
379c5c09 | 165 | } |
fc5cc4cd | 166 | |
a85e6165 | 167 | |
379c5c09 | 168 | fEnergy = (Double_t)maxSample; |
169 | if (maxSample > 900 && nMax > 2) fOverflow = kTRUE; | |
170 | ||
fc5cc4cd | 171 | Double_t pedestal = 0 ; |
379c5c09 | 172 | if (fPedSubtract) { |
173 | if (nPed > 0) { | |
174 | fPedestalRMS=(pedRMS - pedMean*pedMean/nPed)/nPed ; | |
175 | if(fPedestalRMS > 0.) | |
176 | fPedestalRMS = TMath::Sqrt(fPedestalRMS) ; | |
fc5cc4cd | 177 | pedestal = (Double_t)(pedMean/nPed); |
379c5c09 | 178 | } |
179 | else | |
180 | return kFALSE; | |
181 | } | |
182 | else { | |
183 | //take pedestals from DB | |
fc5cc4cd | 184 | pedestal = (Double_t) fAmpOffset ; |
379c5c09 | 185 | if (fCalibData) { |
186 | Float_t truePed = fCalibData->GetADCpedestalEmc(fModule, fCellZ, fCellX) ; | |
187 | Int_t altroSettings = fCalibData->GetAltroOffsetEmc(fModule, fCellZ, fCellX) ; | |
188 | pedestal += truePed - altroSettings ; | |
189 | } | |
190 | else{ | |
e10f780e | 191 | AliDebug(2,Form("Pedestal and offset are not read from OCDB. Use 0 for their values.")) ; |
379c5c09 | 192 | } |
379c5c09 | 193 | } |
fc5cc4cd | 194 | fEnergy-=pedestal ; |
379c5c09 | 195 | if (fEnergy < kBaseLine) fEnergy = 0; |
fc5cc4cd | 196 | |
197 | //Evaluate time | |
198 | Int_t iStart = sigLength-1; | |
199 | while(iStart>=0 && signal[iStart]-pedestal <kBaseLine) iStart-- ; | |
200 | fTime = sigStart-iStart-2; //2: 1 due to oversubtraction in line above, another 1 due to signal started before amp increased | |
201 | const Int_t nLine= 6 ; //Parameters of fitting | |
202 | const Float_t eMinTOF = 10. ; //Choosed from beam-test and cosmic analyis | |
203 | const Float_t kAmp=0.35 ; //Result slightly depends on them, so no getters | |
204 | // Avoid too low peak: | |
205 | if(fEnergy < eMinTOF){ | |
206 | return kTRUE; | |
207 | } | |
208 | ||
209 | // Find index posK (kLevel is a level of "timestamp" point Tk): | |
210 | Int_t posK =sigLength-1 ; //last point before crossing k-level | |
211 | Double_t levelK = pedestal + kAmp*fEnergy; | |
212 | while(signal[posK] <= levelK && posK>=0){ | |
213 | posK-- ; | |
214 | } | |
215 | posK++ ; | |
216 | ||
217 | if(posK == 0 || posK==sigLength-1){ | |
218 | return kTRUE; | |
219 | } | |
220 | ||
221 | // Find crosing point by solving linear equation (least squares method) | |
222 | Int_t np = 0; | |
223 | Int_t iup=posK-1 ; | |
224 | Int_t idn=posK ; | |
225 | Double_t sx = 0., sy = 0., sxx = 0., sxy = 0.; | |
226 | Double_t x,y ; | |
227 | ||
228 | while(np<nLine){ | |
229 | //point above crossing point | |
230 | if(iup>=0){ | |
231 | x = sigLength-iup-1; | |
232 | y = signal[iup]; | |
233 | sx += x; | |
234 | sy += y; | |
235 | sxx += (x*x); | |
236 | sxy += (x*y); | |
237 | np++ ; | |
238 | iup-- ; | |
239 | } | |
240 | //Point below crossing point | |
241 | if(idn<sigLength){ | |
242 | if(signal[idn]<pedestal){ | |
243 | idn=sigLength-1 ; //do not scan further | |
258abb9c | 244 | idn++ ; |
fc5cc4cd | 245 | continue ; |
246 | } | |
247 | x = sigLength-idn-1; | |
248 | y = signal[idn]; | |
249 | sx += x; | |
250 | sy += y; | |
251 | sxx += (x*x); | |
252 | sxy += (x*y); | |
253 | np++; | |
254 | idn++ ; | |
255 | } | |
256 | if(idn>=sigLength && iup<0){ | |
257 | break ; //can not fit futher | |
258 | } | |
259 | } | |
260 | ||
261 | Double_t det = np*sxx - sx*sx; | |
262 | if(det == 0){ | |
263 | return kTRUE; | |
264 | } | |
265 | Double_t c1 = (np*sxy - sx*sy)/det; //slope | |
266 | Double_t c0 = (sy-c1*sx)/np; //offset | |
267 | if(c1 == 0){ | |
268 | return kTRUE; | |
269 | } | |
270 | ||
271 | // Find where the line cross kLevel: | |
272 | fTime += (levelK - c0)/c1-5. ; //5: mean offset between k-Level and start times | |
379c5c09 | 273 | return kTRUE; |
274 | ||
275 | } |