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17 /* History of cvs commits:
20 * Revision 1.8 2007/12/05 02:30:51 jklay
21 * modification to read Altro mappings into AliEMCALRecParam and pass to AliEMCALRawUtils from AliEMCALReconstructor; add option to AliEMCALRawUtils to set old RCU format (for testbeam) or not
23 * Revision 1.7 2007/11/14 15:51:46 gustavo
24 * Take out few unnecessary prints
26 * Revision 1.6 2007/11/01 01:23:51 mvl
27 * Removed call to SetOldRCUFormat, which is only needed for testbeam data
29 * Revision 1.5 2007/11/01 01:20:33 mvl
30 * Further improvement of peak finding; more robust fit
32 * Revision 1.4 2007/10/31 17:15:24 mvl
33 * Fixed bug in raw data unpacking; Added pedestal to signal fit; Added logic to deal with high/low gain
35 * Revision 1.3 2007/09/27 08:36:46 mvl
36 * More robust setting of fit range in FitRawSignal (P. Hristov)
38 * Revision 1.2 2007/09/03 20:55:35 jklay
39 * EMCAL e-by-e reconstruction methods from Cvetan
41 * Revision 1.1 2007/03/17 19:56:38 mvl
42 * Moved signal shape routines from AliEMCAL to separate class AliEMCALRawUtils to streamline raw data reconstruction code.
45 //*-- Author: Marco van Leeuwen (LBL)
46 #include "AliEMCALRawUtils.h"
53 #include "AliRunLoader.h"
54 #include "AliCaloAltroMapping.h"
55 #include "AliAltroBuffer.h"
56 #include "AliRawReader.h"
57 #include "AliCaloRawStream.h"
60 #include "AliEMCALRecParam.h"
61 #include "AliEMCALLoader.h"
62 #include "AliEMCALGeometry.h"
63 #include "AliEMCALDigitizer.h"
64 #include "AliEMCALDigit.h"
67 ClassImp(AliEMCALRawUtils)
69 // Signal shape parameters
70 Int_t AliEMCALRawUtils::fgOrder = 2 ; // Order of gamma function
71 Double_t AliEMCALRawUtils::fgTimeBinWidth = 100E-9 ; // each sample is 100 ns
72 Double_t AliEMCALRawUtils::fgTau = 235E-9 ; // 235 ns (from CERN testbeam; not very accurate)
73 Double_t AliEMCALRawUtils::fgTimeTrigger = 1.5E-6 ; // 15 time bins ~ 1.5 musec
75 // some digitization constants
76 Int_t AliEMCALRawUtils::fgThreshold = 1;
77 Int_t AliEMCALRawUtils::fgDDLPerSuperModule = 2; // 2 ddls per SuperModule
79 AliEMCALRawUtils::AliEMCALRawUtils()
80 : fHighLowGainFactor(0.), fOption("")
82 fHighLowGainFactor = 16. ; // adjusted for a low gain range of 82 GeV (10 bits)
84 //____________________________________________________________________________
85 AliEMCALRawUtils::~AliEMCALRawUtils() {
87 //____________________________________________________________________________
88 void AliEMCALRawUtils::Digits2Raw(AliAltroMapping **mapping)
90 // convert digits of the current event to raw data
92 AliRunLoader *rl = AliRunLoader::GetRunLoader();
93 AliEMCALLoader *loader = dynamic_cast<AliEMCALLoader*>(rl->GetDetectorLoader("EMCAL"));
96 loader->LoadDigits("EMCAL");
98 TClonesArray* digits = loader->Digits() ;
101 Warning("Digits2Raw", "no digits found !");
106 AliEMCALGeometry* geom = AliEMCALGeometry::GetInstance();
108 AliError(Form("No geometry found !"));
112 static const Int_t nDDL = 12*2; // 12 SM hardcoded for now. Buffers allocated dynamically, when needed, so just need an upper limit here
113 AliAltroBuffer* buffers[nDDL];
114 for (Int_t i=0; i < nDDL; i++)
117 Int_t adcValuesLow[fgkTimeBins];
118 Int_t adcValuesHigh[fgkTimeBins];
120 // loop over digits (assume ordered digits)
121 for (Int_t iDigit = 0; iDigit < digits->GetEntries(); iDigit++) {
122 AliEMCALDigit* digit = dynamic_cast<AliEMCALDigit *>(digits->At(iDigit)) ;
123 if (digit->GetAmp() < fgThreshold)
133 geom->GetCellIndex(digit->GetId(), nSM, nModule, nIphi, nIeta);
134 geom->GetCellPhiEtaIndexInSModule(nSM, nModule, nIphi, nIeta,iphi, ieta) ;
136 //Check which is the RCU of the cell.
139 if (0<=iphi&&iphi<8) iRCU=0; // first cable row
140 else if (8<=iphi&&iphi<16 && 0<=ieta&&ieta<24) iRCU=0; // first half;
143 else if(8<=iphi&&iphi<16 && 24<=ieta&&ieta<48) iRCU=1; // second half;
145 else if(16<=iphi&&iphi<24) iRCU=1; // third cable row
148 Int_t iDDL = fgDDLPerSuperModule* nSM + iRCU;
150 Fatal("Digits2Raw()","Non-existent DDL board number: %d", iDDL);
152 if (buffers[iDDL] == 0) {
153 // open new file and write dummy header
154 TString fileName = AliDAQ::DdlFileName("EMCAL",iDDL);
155 buffers[iDDL] = new AliAltroBuffer(fileName.Data(),mapping[iRCU]);
156 buffers[iDDL]->WriteDataHeader(kTRUE, kFALSE); //Dummy;
159 // out of time range signal (?)
160 if (digit->GetTimeR() > GetRawFormatTimeMax() ) {
161 AliInfo("Signal is out of time range.\n");
162 buffers[iDDL]->FillBuffer((Int_t)digit->GetAmp());
163 buffers[iDDL]->FillBuffer(GetRawFormatTimeBins() ); // time bin
164 buffers[iDDL]->FillBuffer(3); // bunch length
165 buffers[iDDL]->WriteTrailer(3, ieta, iphi, nSM); // trailer
166 // calculate the time response function
168 Bool_t lowgain = RawSampledResponse(digit->GetTimeR(), digit->GetAmp(), adcValuesHigh, adcValuesLow) ;
170 buffers[iDDL]->WriteChannel(ieta, iphi, 0, GetRawFormatTimeBins(), adcValuesLow, fgThreshold);
172 buffers[iDDL]->WriteChannel(ieta,iphi, 1, GetRawFormatTimeBins(), adcValuesHigh, fgThreshold);
176 // write headers and close files
177 for (Int_t i=0; i < nDDL; i++) {
180 buffers[i]->WriteDataHeader(kFALSE, kFALSE);
184 mapping[0]->Delete();
185 mapping[1]->Delete();
186 loader->UnloadDigits();
189 //____________________________________________________________________________
190 void AliEMCALRawUtils::Raw2Digits(AliRawReader* reader,TClonesArray *digitsArr,
191 AliAltroMapping **mapping)
193 // convert raw data of the current event to digits
194 AliEMCALGeometry * geom = AliEMCALGeometry::GetInstance();
196 AliError(Form("No geometry found !"));
203 Error("Raw2Digits", "no digits found !");
207 Error("Raw2Digits", "no raw reader found !");
211 AliCaloRawStream in(reader,"EMCAL",mapping);
212 // Select EMCAL DDL's;
213 reader->Select("EMCAL");
215 TString option = GetOption();
216 if (option.Contains("OldRCUFormat"))
217 in.SetOldRCUFormat(kTRUE); // Needed for testbeam data
219 in.SetOldRCUFormat(kFALSE);
222 //Updated fitting routine from 2007 beam test takes into account
223 //possibility of two peaks in data and selects first one for fitting
224 //Also sets some of the starting parameters based on the shape of the
225 //given raw signal being fit
227 TF1 * signalF = new TF1("signal", RawResponseFunction, 0, GetRawFormatTimeBins(), 5);
228 signalF->SetParNames("amp","t0","tau","N","ped");
229 signalF->SetParameter(2,2.35); // tau in units of time bin
230 signalF->SetParLimits(2,2,-1);
231 signalF->SetParameter(3,2); // order
232 signalF->SetParLimits(3,2,-1);
238 //Graph to hold data we will fit (should be converted to an array
239 //later to speed up processing
240 TGraph * gSig = new TGraph(GetRawFormatTimeBins());
245 while (readOk && in.GetModule() < 0)
246 readOk = in.Next(); // Go to first digit
252 id = geom->GetAbsCellIdFromCellIndexes(in.GetModule(), in.GetRow(), in.GetColumn()) ;
253 lowGain = in.IsLowGain();
254 Int_t maxTime = in.GetTime(); // timebins come in reverse order
255 if (maxTime < 0 || maxTime >= GetRawFormatTimeBins()) {
256 AliWarning(Form("Invalid time bin %d",maxTime));
257 maxTime = GetRawFormatTimeBins();
259 gSig->Set(maxTime+1);
260 // There is some kind of zero-suppression in the raw data,
261 // so set up the TGraph in advance
262 for (Int_t i=0; i < maxTime; i++) {
263 gSig->SetPoint(i, i , 0);
268 if (in.GetTime() >= gSig->GetN()) {
269 AliWarning("Too many time bins");
270 gSig->Set(in.GetTime());
272 col = in.GetColumn();
275 gSig->SetPoint(in.GetTime(), in.GetTime(), in.GetSignal()) ;
276 if (in.GetTime() > maxTime)
277 maxTime = in.GetTime();
279 } while ((readOk = in.Next()) && !in.IsNewHWAddress());
281 FitRaw(gSig, signalF, amp, time) ;
284 AliDebug(2,Form("id %d lowGain %d amp %g", id, lowGain, amp));
285 //cout << "col " << col-40 << " row " << row-8 << " lowGain " << lowGain << " amp " << amp << endl;
286 AddDigit(digitsArr, id, lowGain, (Int_t)amp, time);
290 for (Int_t index = 0; index < gSig->GetN(); index++) {
291 gSig->SetPoint(index, index, 0) ;
293 }; // EMCAL entries loop
301 //____________________________________________________________________________
302 void AliEMCALRawUtils::AddDigit(TClonesArray *digitsArr, Int_t id, Int_t lowGain, Int_t amp, Float_t time) {
305 // This routine checks whether a digit exists already for this tower
306 // and then decides whether to use the high or low gain info
308 // Called by Raw2Digits
310 AliEMCALDigit *digit = 0, *tmpdigit = 0;
312 TIter nextdigit(digitsArr);
313 while (digit == 0 && (tmpdigit = (AliEMCALDigit*) nextdigit())) {
314 if (tmpdigit->GetId() == id)
318 if (!digit) { // no digit existed for this tower; create one
320 amp = Int_t(fHighLowGainFactor * amp);
321 Int_t idigit = digitsArr->GetEntries();
322 new((*digitsArr)[idigit]) AliEMCALDigit( -1, -1, id, amp, time, idigit) ;
324 else { // a digit already exists, check range
325 // (use high gain if signal < 800, otherwise low gain)
326 if (lowGain) { // new digit is low gain
327 if (digit->GetAmp() > 800) { // use if stored digit is out of range
328 digit->SetAmp(Int_t(fHighLowGainFactor * amp));
329 digit->SetTime(time);
332 else if (amp < 800) { // new digit is high gain; use if not out of range
334 digit->SetTime(time);
339 //____________________________________________________________________________
340 void AliEMCALRawUtils::FitRaw(TGraph * gSig, TF1* signalF, Float_t & amp, Float_t & time)
342 // Fits the raw signal time distribution; from AliEMCALGetter
344 const Int_t kNoiseThreshold = 5;
345 const Int_t kNPedSamples = 5;
350 for (Int_t index = 0; index < kNPedSamples; index++) {
351 Double_t ttime, signal;
352 gSig->GetPoint(index, ttime, signal) ;
362 AliWarning("Could not determine pedestal");
363 ped = 10; // put some small value as first guess
369 Float_t max_fit = gSig->GetN();
370 Float_t min_after_sig = 9999;
371 Int_t tmin_after_sig = gSig->GetN();
372 Int_t n_ped_after_sig = 0;
374 for (Int_t i=kNPedSamples; i < gSig->GetN(); i++) {
375 Double_t ttime, signal;
376 gSig->GetPoint(i, ttime, signal) ;
377 if (!max_found && signal > max) {
381 else if ( max > ped + kNoiseThreshold ) {
383 min_after_sig = signal;
387 if ( signal < min_after_sig) {
388 min_after_sig = signal;
391 if (i > tmin_after_sig + 5) { // Two close peaks; end fit at minimum
392 max_fit = tmin_after_sig;
395 if ( signal < ped + kNoiseThreshold)
397 if (n_ped_after_sig >= 5) { // include 5 pedestal bins after peak
404 if ( max - ped > kNoiseThreshold ) { // else its noise
405 AliDebug(2,Form("Fitting max %d ped %d", max, ped));
406 signalF->SetRange(0,max_fit);
409 signalF->SetParLimits(2,1,3);
411 signalF->SetParameter(4, ped) ;
412 signalF->SetParameter(1, i_max);
413 signalF->SetParameter(0, max);
415 gSig->Fit(signalF, "QROW"); // Note option 'W': equal errors on all points
416 amp = signalF->GetParameter(0);
417 time = signalF->GetParameter(1)*GetRawFormatTimeBinWidth() - fgTimeTrigger;
421 //__________________________________________________________________
422 Double_t AliEMCALRawUtils::RawResponseFunction(Double_t *x, Double_t *par)
424 // Matches version used in 2007 beam test
426 // Shape of the electronics raw reponse:
427 // It is a semi-gaussian, 2nd order Gamma function of the general form
429 // t' = (t - t0 + tau) / tau
430 // F = A * t**N * exp( N * ( 1 - t) ) for t >= 0
434 // A: par[0] // Amplitude = peak value
441 Double_t tau =par[2];
443 Double_t ped = par[4];
444 Double_t xx = ( x[0] - par[1] + tau ) / tau ;
449 signal = ped + par[0] * TMath::Power(xx , N) * TMath::Exp(N * (1 - xx )) ;
454 //__________________________________________________________________
455 Bool_t AliEMCALRawUtils::RawSampledResponse(
456 const Double_t dtime, const Double_t damp, Int_t * adcH, Int_t * adcL) const
458 // for a start time dtime and an amplitude damp given by digit,
459 // calculates the raw sampled response AliEMCAL::RawResponseFunction
461 const Int_t kRawSignalOverflow = 0x3FF ;
462 const Int_t pedVal = 32;
463 Bool_t lowGain = kFALSE ;
465 TF1 signalF("signal", RawResponseFunction, 0, GetRawFormatTimeMax(), 4);
466 signalF.SetParameter(0, pedVal) ;
467 signalF.SetParameter(1, damp) ;
468 signalF.SetParameter(2, dtime + fgTimeTrigger) ;
470 for (Int_t iTime = 0; iTime < GetRawFormatTimeBins(); iTime++) {
471 Double_t time = iTime * GetRawFormatTimeBinWidth() ;
472 Double_t signal = signalF.Eval(time) ;
473 adcH[iTime] = static_cast<Int_t>(signal + 0.5) ;
474 if ( adcH[iTime] > kRawSignalOverflow ){ // larger than 10 bits
475 adcH[iTime] = kRawSignalOverflow ;
479 signal /= fHighLowGainFactor;
481 adcL[iTime] = static_cast<Int_t>(signal + 0.5) ;
482 if ( adcL[iTime] > kRawSignalOverflow) // larger than 10 bits
483 adcL[iTime] = kRawSignalOverflow ;