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. *
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14 **************************************************************************/
18 //_________________________________________________________________________
19 // Utility Class for handling Raw data
20 // Does all transitions from Digits to Raw and vice versa,
21 // for simu and reconstruction
23 // Note: the current version is still simplified. Only
24 // one raw signal per digit is generated; either high-gain or low-gain
25 // Need to add concurrent high and low-gain info in the future
26 // No pedestal is added to the raw signal.
27 //*-- Author: Marco van Leeuwen (LBL)
29 #include "AliEMCALRawUtils.h"
37 #include "AliRunLoader.h"
38 class AliCaloAltroMapping;
39 #include "AliAltroBuffer.h"
40 #include "AliRawReader.h"
41 #include "AliCaloRawStreamV3.h"
44 #include "AliEMCALRecParam.h"
45 #include "AliEMCALLoader.h"
46 #include "AliEMCALGeometry.h"
47 class AliEMCALDigitizer;
48 #include "AliEMCALDigit.h"
50 #include "AliCaloCalibPedestal.h"
52 ClassImp(AliEMCALRawUtils)
54 // Signal shape parameters
55 Int_t AliEMCALRawUtils::fgTimeBins = 256; // number of sampling bins of the raw RO signal (we typically use 15-50; theoretical max is 1k+)
56 Double_t AliEMCALRawUtils::fgTimeBinWidth = 100E-9 ; // each sample is 100 ns
57 Double_t AliEMCALRawUtils::fgTimeTrigger = 1.5E-6 ; // 15 time bins ~ 1.5 musec
59 // some digitization constants
60 Int_t AliEMCALRawUtils::fgThreshold = 1;
61 Int_t AliEMCALRawUtils::fgDDLPerSuperModule = 2; // 2 ddls per SuperModule
62 Int_t AliEMCALRawUtils::fgPedestalValue = 32; // pedestal value for digits2raw
63 Double_t AliEMCALRawUtils::fgFEENoise = 3.; // 3 ADC channels of noise (sampled)
65 AliEMCALRawUtils::AliEMCALRawUtils()
66 : fHighLowGainFactor(0.), fOrder(0), fTau(0.), fNoiseThreshold(0),
67 fNPedSamples(0), fGeom(0), fOption("")
70 //These are default parameters.
71 //Can be re-set from without with setter functions
72 fHighLowGainFactor = 16. ; // adjusted for a low gain range of 82 GeV (10 bits)
73 fOrder = 2; // order of gamma fn
74 fTau = 2.35; // in units of timebin, from CERN 2007 testbeam
75 fNoiseThreshold = 3; // 3 ADC counts is approx. noise level
76 fNPedSamples = 4; // less than this value => likely pedestal samples
78 //Get Mapping RCU files from the AliEMCALRecParam
79 const TObjArray* maps = AliEMCALRecParam::GetMappings();
80 if(!maps) AliFatal("Cannot retrieve ALTRO mappings!!");
82 for(Int_t i = 0; i < 4; i++) {
83 fMapping[i] = (AliAltroMapping*)maps->At(i);
86 //To make sure we match with the geometry in a simulation file,
87 //let's try to get it first. If not, take the default geometry
88 AliRunLoader *rl = AliRunLoader::Instance();
89 if(!rl) AliError("Cannot find RunLoader!");
90 if (rl->GetAliRun() && rl->GetAliRun()->GetDetector("EMCAL")) {
91 fGeom = dynamic_cast<AliEMCAL*>(rl->GetAliRun()->GetDetector("EMCAL"))->GetGeometry();
93 AliInfo(Form("Using default geometry in raw reco"));
94 fGeom = AliEMCALGeometry::GetInstance(AliEMCALGeometry::GetDefaultGeometryName());
97 if(!fGeom) AliFatal(Form("Could not get geometry!"));
101 //____________________________________________________________________________
102 AliEMCALRawUtils::AliEMCALRawUtils(AliEMCALGeometry *pGeometry)
103 : fHighLowGainFactor(0.), fOrder(0), fTau(0.), fNoiseThreshold(0),
104 fNPedSamples(0), fGeom(pGeometry), fOption("")
107 // Initialize with the given geometry - constructor required by HLT
108 // HLT does not use/support AliRunLoader(s) instances
109 // This is a minimum intervention solution
110 // Comment by MPloskon@lbl.gov
113 //These are default parameters.
114 //Can be re-set from without with setter functions
115 fHighLowGainFactor = 16. ; // adjusted for a low gain range of 82 GeV (10 bits)
116 fOrder = 2; // order of gamma fn
117 fTau = 2.35; // in units of timebin, from CERN 2007 testbeam
118 fNoiseThreshold = 3; // 3 ADC counts is approx. noise level
119 fNPedSamples = 4; // less than this value => likely pedestal samples
121 //Get Mapping RCU files from the AliEMCALRecParam
122 const TObjArray* maps = AliEMCALRecParam::GetMappings();
123 if(!maps) AliFatal("Cannot retrieve ALTRO mappings!!");
125 for(Int_t i = 0; i < 4; i++) {
126 fMapping[i] = (AliAltroMapping*)maps->At(i);
129 if(!fGeom) AliFatal(Form("Could not get geometry!"));
133 //____________________________________________________________________________
134 AliEMCALRawUtils::AliEMCALRawUtils(const AliEMCALRawUtils& rawU)
136 fHighLowGainFactor(rawU.fHighLowGainFactor),
139 fNoiseThreshold(rawU.fNoiseThreshold),
140 fNPedSamples(rawU.fNPedSamples),
142 fOption(rawU.fOption)
145 fMapping[0] = rawU.fMapping[0];
146 fMapping[1] = rawU.fMapping[1];
147 fMapping[2] = rawU.fMapping[2];
148 fMapping[3] = rawU.fMapping[3];
151 //____________________________________________________________________________
152 AliEMCALRawUtils& AliEMCALRawUtils::operator =(const AliEMCALRawUtils &rawU)
154 //assignment operator
157 fHighLowGainFactor = rawU.fHighLowGainFactor;
158 fOrder = rawU.fOrder;
160 fNoiseThreshold = rawU.fNoiseThreshold;
161 fNPedSamples = rawU.fNPedSamples;
163 fOption = rawU.fOption;
164 fMapping[0] = rawU.fMapping[0];
165 fMapping[1] = rawU.fMapping[1];
166 fMapping[2] = rawU.fMapping[2];
167 fMapping[3] = rawU.fMapping[3];
174 //____________________________________________________________________________
175 AliEMCALRawUtils::~AliEMCALRawUtils() {
180 //____________________________________________________________________________
181 void AliEMCALRawUtils::Digits2Raw()
183 // convert digits of the current event to raw data
185 AliRunLoader *rl = AliRunLoader::Instance();
186 AliEMCALLoader *loader = dynamic_cast<AliEMCALLoader*>(rl->GetDetectorLoader("EMCAL"));
189 loader->LoadDigits("EMCAL");
191 TClonesArray* digits = loader->Digits() ;
194 Warning("Digits2Raw", "no digits found !");
198 static const Int_t nDDL = 12*2; // 12 SM hardcoded for now. Buffers allocated dynamically, when needed, so just need an upper limit here
199 AliAltroBuffer* buffers[nDDL];
200 for (Int_t i=0; i < nDDL; i++)
203 TArrayI adcValuesLow(fgTimeBins);
204 TArrayI adcValuesHigh(fgTimeBins);
206 // loop over digits (assume ordered digits)
207 for (Int_t iDigit = 0; iDigit < digits->GetEntries(); iDigit++) {
208 AliEMCALDigit* digit = dynamic_cast<AliEMCALDigit *>(digits->At(iDigit)) ;
209 if (digit->GetAmp() < fgThreshold)
219 fGeom->GetCellIndex(digit->GetId(), nSM, nModule, nIphi, nIeta);
220 fGeom->GetCellPhiEtaIndexInSModule(nSM, nModule, nIphi, nIeta,iphi, ieta) ;
222 //Check which is the RCU, 0 or 1, of the cell.
225 if (0<=iphi&&iphi<8) iRCU=0; // first cable row
226 else if (8<=iphi&&iphi<16 && 0<=ieta&&ieta<24) iRCU=0; // first half;
229 else if(8<=iphi&&iphi<16 && 24<=ieta&&ieta<48) iRCU=1; // second half;
231 else if(16<=iphi&&iphi<24) iRCU=1; // third cable row
233 if (nSM%2==1) iRCU = 1 - iRCU; // swap for odd=C side, to allow us to cable both sides the same
236 Fatal("Digits2Raw()","Non-existent RCU number: %d", iRCU);
239 Int_t iDDL = fgDDLPerSuperModule* nSM + iRCU;
241 Fatal("Digits2Raw()","Non-existent DDL board number: %d", iDDL);
243 if (buffers[iDDL] == 0) {
244 // open new file and write dummy header
245 TString fileName = AliDAQ::DdlFileName("EMCAL",iDDL);
246 //Select mapping file RCU0A, RCU0C, RCU1A, RCU1C
247 Int_t iRCUside=iRCU+(nSM%2)*2;
248 //iRCU=0 and even (0) SM -> RCU0A.data 0
249 //iRCU=1 and even (0) SM -> RCU1A.data 1
250 //iRCU=0 and odd (1) SM -> RCU0C.data 2
251 //iRCU=1 and odd (1) SM -> RCU1C.data 3
252 //cout<<" nSM "<<nSM<<"; iRCU "<<iRCU<<"; iRCUside "<<iRCUside<<endl;
253 buffers[iDDL] = new AliAltroBuffer(fileName.Data(),fMapping[iRCUside]);
254 buffers[iDDL]->WriteDataHeader(kTRUE, kFALSE); //Dummy;
257 // out of time range signal (?)
258 if (digit->GetTimeR() > GetRawFormatTimeMax() ) {
259 AliInfo("Signal is out of time range.\n");
260 buffers[iDDL]->FillBuffer((Int_t)digit->GetAmp());
261 buffers[iDDL]->FillBuffer(GetRawFormatTimeBins() ); // time bin
262 buffers[iDDL]->FillBuffer(3); // bunch length
263 buffers[iDDL]->WriteTrailer(3, ieta, iphi, nSM); // trailer
264 // calculate the time response function
266 Bool_t lowgain = RawSampledResponse(digit->GetTimeR(), digit->GetAmp(), adcValuesHigh.GetArray(), adcValuesLow.GetArray()) ;
268 buffers[iDDL]->WriteChannel(ieta, iphi, 0, GetRawFormatTimeBins(), adcValuesLow.GetArray(), fgThreshold);
270 buffers[iDDL]->WriteChannel(ieta,iphi, 1, GetRawFormatTimeBins(), adcValuesHigh.GetArray(), fgThreshold);
274 // write headers and close files
275 for (Int_t i=0; i < nDDL; i++) {
278 buffers[i]->WriteDataHeader(kFALSE, kFALSE);
283 loader->UnloadDigits();
286 //____________________________________________________________________________
287 void AliEMCALRawUtils::Raw2Digits(AliRawReader* reader,TClonesArray *digitsArr, AliCaloCalibPedestal* pedbadmap)
289 // convert raw data of the current event to digits
294 Error("Raw2Digits", "no digits found !");
298 Error("Raw2Digits", "no raw reader found !");
302 AliCaloRawStreamV3 in(reader,"EMCAL",fMapping);
303 // Select EMCAL DDL's;
304 reader->Select("EMCAL",0,43); // 43 = AliEMCALGeoParams::fgkLastAltroDDL
306 //Updated fitting routine from 2007 beam test takes into account
307 //possibility of two peaks in data and selects first one for fitting
308 //Also sets some of the starting parameters based on the shape of the
309 //given raw signal being fit
311 TF1 * signalF = new TF1("signal", RawResponseFunction, 0, GetRawFormatTimeBins(), 5);
312 signalF->SetParameters(10.,5.,fTau,fOrder,0.); //set all defaults once, just to be safe
313 signalF->SetParNames("amp","t0","tau","N","ped");
314 signalF->FixParameter(2,fTau); // tau in units of time bin
315 signalF->FixParameter(3,fOrder); // order
321 Float_t ampEstimate = 0;
322 Float_t timeEstimate = 0;
323 Float_t pedEstimate = 0;
327 //Graph to hold data we will fit (should be converted to an array
328 //later to speed up processing
329 TGraph * gSig = new TGraph(GetRawFormatTimeBins());
332 Int_t caloFlag = 0; // low, high gain, or TRU, or LED ref.
334 // start loop over input stream
335 while (in.NextDDL()) {
336 while (in.NextChannel()) {
338 //Check if the signal is high or low gain and then do the fit,
339 //if it is from TRU do not fit
340 caloFlag = in.GetCaloFlag();
341 if (caloFlag != 0 && caloFlag != 1) continue;
343 //Do not fit bad channels
344 if(pedbadmap->IsBadChannel(in.GetModule(),in.GetColumn(),in.GetRow())) {
345 //printf("Tower from SM %d, column %d, row %d is BAD!!! Skip \n", in.GetModule(),in.GetColumn(),in.GetRow());
349 // There can be zero-suppression in the raw data,
350 // so set up the TGraph in advance
351 for (i=0; i < GetRawFormatTimeBins(); i++) {
352 gSig->SetPoint(i, i , -1); // init to out-of-range values
355 Int_t maxTimeBin = 0;
356 Int_t min = 0x3ff; // init to 10-bit max
357 Int_t max = 0; // init to 10-bit min
358 while (in.NextBunch()) {
360 const UShort_t *sig = in.GetSignals();
361 startBin = in.GetStartTimeBin();
362 if (maxTimeBin < startBin) {
363 maxTimeBin = startBin; // timebins come in reverse order
365 if (maxTimeBin < 0 || maxTimeBin >= GetRawFormatTimeBins()) {
366 AliWarning(Form("Invalid time bin %d",maxTimeBin));
367 maxTimeBin = GetRawFormatTimeBins();
370 for (i = 0; i < in.GetBunchLength(); i++) {
372 gSig->SetPoint((Int_t)time, time, (Double_t) sig[i]) ;
373 if (max < sig[i]) max = sig[i];
374 if (min > sig[i]) min = sig[i];
377 } // loop over bunches
379 gSig->Set(maxTimeBin+1); // set actual max size of TGraph
381 //Initialize the variables, do not keep previous values.
382 // not really necessary to reset all of them (only amp and time at the moment), but better safe than sorry
389 if ( (max - min) > fNoiseThreshold) {
390 FitRaw(gSig, signalF, maxTimeBin, amp, time, ped,
391 ampEstimate, timeEstimate, pedEstimate);
394 if ( amp>0 && amp<2000 && time>0 && time<(maxTimeBin*GetRawFormatTimeBinWidth()) ) { //check both high and low end of amplitude result, and time
395 //2000 is somewhat arbitrary - not nice with magic numbers in the code..
396 id = fGeom->GetAbsCellIdFromCellIndexes(in.GetModule(), in.GetRow(), in.GetColumn()) ;
397 lowGain = in.IsLowGain();
399 // check fit results: should be consistent with initial estimates
400 // more magic numbers, but very loose cuts, for now..
401 // We have checked that amp an time values are positive so division for assymmetry
402 // calculation should be OK/safe
403 Float_t ampAsymm = (amp - ampEstimate)/(amp + ampEstimate);
404 if ( (TMath::Abs(ampAsymm) > 0.1) ||
405 (TMath::Abs(time - timeEstimate) > 2*GetRawFormatTimeBinWidth()) ) {
406 AliDebug(2,Form("Fit results ped %f amp %f time %f not consistent with expectations ped %f max-ped %f time %d",
407 ped, amp, time, pedEstimate, ampEstimate, timeEstimate));
409 // what should do we do then? skip this channel or assign the simple estimate?
410 // for now just overwrite the fit results with the simple estimate
415 AliDebug(2,Form("id %d lowGain %d amp %g", id, lowGain, amp));
416 // printf("Added tower: SM %d, row %d, column %d, amp %3.2f\n",in.GetModule(), in.GetRow(), in.GetColumn(),amp);
417 // round off amplitude value to nearest integer
418 AddDigit(digitsArr, id, lowGain, TMath::Nint(amp), time);
422 for (Int_t index = 0; index < gSig->GetN(); index++) {
423 gSig->SetPoint(index, index, -1) ;
425 // Reset starting parameters for fit function
426 signalF->SetParameters(10.,5.,fTau,fOrder,0.); //reset all defaults just to be safe
428 } // end while over channel
429 } //end while over DDL's, of input stream
437 //____________________________________________________________________________
438 void AliEMCALRawUtils::AddDigit(TClonesArray *digitsArr, Int_t id, Int_t lowGain, Int_t amp, Float_t time) {
441 // This routine checks whether a digit exists already for this tower
442 // and then decides whether to use the high or low gain info
444 // Called by Raw2Digits
446 AliEMCALDigit *digit = 0, *tmpdigit = 0;
447 TIter nextdigit(digitsArr);
448 while (digit == 0 && (tmpdigit = (AliEMCALDigit*) nextdigit())) {
449 if (tmpdigit->GetId() == id)
453 if (!digit) { // no digit existed for this tower; create one
454 if (lowGain && amp > fgkOverflowCut)
455 amp = Int_t(fHighLowGainFactor * amp);
456 Int_t idigit = digitsArr->GetEntries();
457 new((*digitsArr)[idigit]) AliEMCALDigit( -1, -1, id, amp, time, idigit) ;
459 else { // a digit already exists, check range
460 // (use high gain if signal < cut value, otherwise low gain)
461 if (lowGain) { // new digit is low gain
462 if (digit->GetAmp() > fgkOverflowCut) { // use if stored digit is out of range
463 digit->SetAmp(Int_t(fHighLowGainFactor * amp));
464 digit->SetTime(time);
467 else if (amp < fgkOverflowCut) { // new digit is high gain; use if not out of range
469 digit->SetTime(time);
474 //____________________________________________________________________________
475 void AliEMCALRawUtils::FitRaw(TGraph * gSig, TF1* signalF, const Int_t lastTimeBin, Float_t & amp, Float_t & time, Float_t & ped, Float_t & ampEstimate, Float_t & timeEstimate, Float_t & pedEstimate, const Float_t cut) const
477 // Fits the raw signal time distribution; from AliEMCALGetter
478 // last argument: Float_t cut = 0.0; // indicating how much of amplitude w.r.t. max value fit should be above noise and pedestal
480 // initialize return values
488 // 0th step: remove plateau / overflow candidates
489 // before trying to estimate amplitude, search for maxima etc.
491 Int_t nOrig = gSig->GetN(); // number of samples before we remove any overflows
492 // Values for readback from input graph
497 // start: tmp dump of all values
498 for (Int_t i=0; i<gSig->GetN(); i++) {
499 gSig->GetPoint(i, ttime, signal) ; // get values
500 printf("orig: i %d, time %f, signal %f\n",i, ttime, signal);
502 // end: tmp dump of all values
505 // start from back of TGraph since RemovePoint will downshift indices
506 for (Int_t i=nOrig-1; i>=0; i--) {
507 gSig->GetPoint(i, ttime, signal) ; // get values
508 if (signal >= (pedEstimate + fgkOverflowCut) ) {
509 gSig->RemovePoint(i);
513 // 1st step: we try to estimate the pedestal value
515 for (Int_t index = 0; index < gSig->GetN(); index++) {
516 gSig->GetPoint(index, ttime, signal) ;
517 // ttime < fNPedsamples used for pedestal estimate;
518 // ttime >= fNPedSamples used for signal checks
519 if (signal >= 0 && ttime<fNPedSamples) { // valid value
520 pedEstimate += signal;
528 //AliWarning("Could not determine pedestal");
529 AliDebug(1,"Could not determine pedestal");
530 pedEstimate = 0; // good estimate for ZeroSupp data (non ZS data should have no problem with pedestal estimate)
533 // 2nd step: we look through the rest of the time-bins/ADC values and
534 // see if we have something that looks like a signal.
535 // We look for a first local maxima, as well as for a global maxima
536 Int_t locMaxFound = 0;
537 Int_t locMaxId = 0; // time-bin index at first local max
538 Float_t locMaxSig = -1; // actual local max value
539 Int_t globMaxId = 0; // time-bin index at global max
540 Float_t globMaxSig = -1; // actual global max value
541 // We will also look for any values that look like they are in overflow region
542 for (Int_t i=0; i<gSig->GetN(); i++) {
543 gSig->GetPoint(i, ttime, signal) ; // get values
545 // ttime < fNPedsamples used for pedestal estimate;
546 // ttime >= fNPedSamples used for signal checks
547 if (ttime >= fNPedSamples) {
549 // look for first local maximum signal=ADC value
550 if (!locMaxFound && signal > locMaxSig) {
554 else if ( locMaxSig > (pedEstimate + fNoiseThreshold) ) {
555 // we enter this condition after signal<=max, but previous
556 // max value was large enough. I.e. at least a significant local
557 // maxima has been found (just before)
561 // also check for global maximum..
562 if (signal > globMaxSig) {
567 } // end for-loop over samples after pedestal
569 // OK, we have looked through the signal spectra, let's see if we should try to make the fit
570 ampEstimate = locMaxSig - pedEstimate; // estimate using first local maxima
571 if ( ampEstimate > fNoiseThreshold ) { // else it's just noise
573 //Check that the local maximum we will use is not at the end or beginning of time sample range
574 Double_t timeMax = -1;
575 Int_t iMax = locMaxId;
576 gSig->GetPoint(locMaxId, timeMax, signal) ;
577 if (timeMax < 2 || timeMax > lastTimeBin-1) { // lastTimeBin is the lowest kept time-sample; current (Dec 2009) case
578 // if (timeMax < 2 || timeMax > lastTimeBin-2) { // for when lastTimeBin is the lowest read-out time-sample, future (2010) case
579 AliDebug(1,Form("Skip fit, maximum of the sample close to the edges : timeMax %3.2f, ampEstimate %3.2f",timeMax, ampEstimate));
583 // Check if the local and global maximum disagree
584 if (locMaxId != globMaxId) {
585 AliDebug(1,Form("Warning, local first maximum %d does not agree with global maximum %d\n", locMaxId, globMaxId));
589 // Get the maximum and find the lowest timebin (tailmin) where the ADC value is not
590 // significantly different from the pedestal
591 // first lower times edge a.k.a. tailmin
593 Double_t tmptime = 0;
594 for (Int_t i=iMax-1; i > 0; i--) {
595 gSig->GetPoint(i, tmptime, signal) ;
596 if((signal-pedEstimate) < fNoiseThreshold){
601 // then same exercise for the higher times edge a.k.a. tailmax
602 Int_t tailMax = lastTimeBin;
603 for (Int_t i=iMax+1; i < gSig->GetN(); i++) {
604 gSig->GetPoint(i, tmptime, signal) ;
605 if ((signal-pedEstimate) <= (ampEstimate*cut + fNoiseThreshold)) { // stop fit at cut-fraction of amplitude above noise-threshold (cut>0 would mean avoid the pulse shape falling edge)
611 // remove all points which are not in the distribution around maximum
612 // i.e. up to tailmin, and from tailmax
613 if ( tailMax != (gSig->GetN()-1) ){ // else nothing to remove
614 nOrig = gSig->GetN(); // can't use GetN call in for loop below since gSig size changes..
615 for(int j = tailMax; j < nOrig; j++) gSig->RemovePoint(tailMax);
617 for(int j = 0; j<=tailMin; j++) gSig->RemovePoint(0);
619 if(gSig->GetN() < 3) {
620 AliDebug(2,Form("Skip fit, number of entries in sample smaller than number of fitting parameters: in sample %d, fitting param 3",
625 timeEstimate = timeMax * GetRawFormatTimeBinWidth();
627 // determine what the valid fit range is
628 Double_t minFit = 9999;
630 for (Int_t i=0; i < gSig->GetN(); i++) {
631 gSig->GetPoint(i, ttime, signal);
632 if (minFit > ttime) minFit=ttime;
633 if (maxFit < ttime) maxFit=ttime;
634 //debug: printf("no tail: i %d, time %f, signal %f\n",i, ttime, signal);
636 signalF->SetRange(minFit, maxFit);
638 signalF->FixParameter(4, pedEstimate) ;
639 signalF->SetParameter(1, timeMax);
640 signalF->SetParameter(0, ampEstimate);
642 gSig->Fit(signalF, "QROW"); // Note option 'W': equal errors on all points
644 // assign fit results
645 amp = signalF->GetParameter(0);
646 time = signalF->GetParameter(1) * GetRawFormatTimeBinWidth(); // skip subtraction of fgTimeTrigger?
647 ped = signalF->GetParameter(4);
649 //BEG YS alternative methods to calculate the amplitude
650 Double_t * ymx = gSig->GetX() ;
651 Double_t * ymy = gSig->GetY() ;
653 Double_t ymMaxX[kN] = {0., 0., 0.} ;
654 Double_t ymMaxY[kN] = {0., 0., 0.} ;
656 // find the maximum amplitude
658 for (Int_t ymi = 0; ymi < gSig->GetN(); ymi++) {
659 if (ymy[ymi] > ymMaxY[0] ) {
660 ymMaxY[0] = ymy[ymi] ; //<========== This is the maximum amplitude
661 ymMaxX[0] = ymx[ymi] ;
665 // find the maximum by fitting a parabola through the max and the two adjacent samples
666 if ( ymiMax < gSig->GetN()-1 && ymiMax > 0) {
667 ymMaxY[1] = ymy[ymiMax+1] ;
668 ymMaxY[2] = ymy[ymiMax-1] ;
669 ymMaxX[1] = ymx[ymiMax+1] ;
670 ymMaxX[2] = ymx[ymiMax-1] ;
671 if (ymMaxY[0]*ymMaxY[1]*ymMaxY[2] > 0) {
672 //fit a parabola through the 3 points y= a+bx+x*x*x
680 for (Int_t i = 0; i < kN ; i++) {
683 sx2 += ymMaxX[i]*ymMaxX[i] ;
684 sx3 += ymMaxX[i]*ymMaxX[i]*ymMaxX[i] ;
685 sx4 += ymMaxX[i]*ymMaxX[i]*ymMaxX[i]*ymMaxX[i] ;
686 sxy += ymMaxX[i]*ymMaxY[i] ;
687 sx2y += ymMaxX[i]*ymMaxX[i]*ymMaxY[i] ;
689 Double_t cN = (sx2y*kN-sy*sx2)*(sx3*sx-sx2*sx2)-(sx2y*sx-sxy*sx2)*(sx3*kN-sx*sx2);
690 Double_t cD = (sx4*kN-sx2*sx2)*(sx3*sx-sx2*sx2)-(sx4*sx-sx3*sx2)*(sx3*kN-sx*sx2) ;
691 Double_t c = cN / cD ;
692 Double_t b = ((sx2y*kN-sy*sx2)-c*(sx4*kN-sx2*sx2))/(sx3*kN-sx*sx2) ;
693 Double_t a = (sy-b*sx-c*sx2)/kN ;
694 Double_t xmax = -b/(2*c) ;
695 ymax = a + b*xmax + c*xmax*xmax ;//<========== This is the maximum amplitude
699 Double_t diff = TMath::Abs(1-ymMaxY[0]/amp) ;
705 } // ampEstimate > fNoiseThreshold
708 //__________________________________________________________________
709 Double_t AliEMCALRawUtils::RawResponseFunction(Double_t *x, Double_t *par)
711 // Matches version used in 2007 beam test
713 // Shape of the electronics raw reponse:
714 // It is a semi-gaussian, 2nd order Gamma function of the general form
716 // xx = (t - t0 + tau) / tau [xx is just a convenient help variable]
717 // F = A * (xx**N * exp( N * ( 1 - xx) ) for xx >= 0
721 // A: par[0] // Amplitude = peak value
728 Double_t tau =par[2];
730 Double_t ped = par[4];
731 Double_t xx = ( x[0] - par[1] + tau ) / tau ;
736 signal = ped + par[0] * TMath::Power(xx , n) * TMath::Exp(n * (1 - xx )) ;
741 //__________________________________________________________________
742 Bool_t AliEMCALRawUtils::RawSampledResponse(
743 const Double_t dtime, const Double_t damp, Int_t * adcH, Int_t * adcL) const
745 // for a start time dtime and an amplitude damp given by digit,
746 // calculates the raw sampled response AliEMCAL::RawResponseFunction
748 Bool_t lowGain = kFALSE ;
750 // A: par[0] // Amplitude = peak value
756 TF1 signalF("signal", RawResponseFunction, 0, GetRawFormatTimeBins(), 5);
757 signalF.SetParameter(0, damp) ;
758 signalF.SetParameter(1, (dtime + fgTimeTrigger)/fgTimeBinWidth) ;
759 signalF.SetParameter(2, fTau) ;
760 signalF.SetParameter(3, fOrder);
761 signalF.SetParameter(4, fgPedestalValue);
763 for (Int_t iTime = 0; iTime < GetRawFormatTimeBins(); iTime++) {
764 Double_t signal = signalF.Eval(iTime) ;
766 // Next lines commeted for the moment but in principle it is not necessary to add
767 // extra noise since noise already added at the digits level.
769 //According to Terry Awes, 13-Apr-2008
770 //add gaussian noise in quadrature to each sample
771 //Double_t noise = gRandom->Gaus(0.,fgFEENoise);
772 //signal = sqrt(signal*signal + noise*noise);
774 // March 17,09 for fast fit simulations by Alexei Pavlinov.
775 // Get from PHOS analysis. In some sense it is open questions.
776 //Double_t noise = gRandom->Gaus(0.,fgFEENoise);
779 adcH[iTime] = static_cast<Int_t>(signal + 0.5) ;
780 if ( adcH[iTime] > fgkRawSignalOverflow ){ // larger than 10 bits
781 adcH[iTime] = fgkRawSignalOverflow ;
785 signal /= fHighLowGainFactor;
787 adcL[iTime] = static_cast<Int_t>(signal + 0.5) ;
788 if ( adcL[iTime] > fgkRawSignalOverflow) // larger than 10 bits
789 adcL[iTime] = fgkRawSignalOverflow ;