**************************************************************************/
/* $Id$ */
-/* History of cvs commits:
- *
- * $Log$
- * Revision 1.10 2007/12/06 13:58:11 hristov
- * Additional pritection. Do not delete the mapping, it is owned by another class
- *
- * Revision 1.9 2007/12/06 02:19:51 jklay
- * incorporated fitting procedure from testbeam analysis into AliRoot
- *
- * Revision 1.8 2007/12/05 02:30:51 jklay
- * 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
- *
- * Revision 1.7 2007/11/14 15:51:46 gustavo
- * Take out few unnecessary prints
- *
- * Revision 1.6 2007/11/01 01:23:51 mvl
- * Removed call to SetOldRCUFormat, which is only needed for testbeam data
- *
- * Revision 1.5 2007/11/01 01:20:33 mvl
- * Further improvement of peak finding; more robust fit
- *
- * Revision 1.4 2007/10/31 17:15:24 mvl
- * Fixed bug in raw data unpacking; Added pedestal to signal fit; Added logic to deal with high/low gain
- *
- * Revision 1.3 2007/09/27 08:36:46 mvl
- * More robust setting of fit range in FitRawSignal (P. Hristov)
- *
- * Revision 1.2 2007/09/03 20:55:35 jklay
- * EMCAL e-by-e reconstruction methods from Cvetan
- *
- * Revision 1.1 2007/03/17 19:56:38 mvl
- * Moved signal shape routines from AliEMCAL to separate class AliEMCALRawUtils to streamline raw data reconstruction code.
- * */
+//_________________________________________________________________________
+// Utility Class for handling Raw data
+// Does all transitions from Digits to Raw and vice versa,
+// for simu and reconstruction
+//
+// Note: the current version is still simplified. Only
+// one raw signal per digit is generated; either high-gain or low-gain
+// Need to add concurrent high and low-gain info in the future
+// No pedestal is added to the raw signal.
//*-- Author: Marco van Leeuwen (LBL)
-#include "AliEMCALRawUtils.h"
+#include "AliEMCALRawUtils.h"
+
#include "TF1.h"
#include "TGraph.h"
-#include "TSystem.h"
-
-#include "AliLog.h"
+class TSystem;
+
+class AliLog;
#include "AliRun.h"
#include "AliRunLoader.h"
-#include "AliCaloAltroMapping.h"
+class AliCaloAltroMapping;
#include "AliAltroBuffer.h"
#include "AliRawReader.h"
-#include "AliCaloRawStream.h"
+#include "AliCaloRawStreamV3.h"
#include "AliDAQ.h"
-
+
#include "AliEMCALRecParam.h"
#include "AliEMCALLoader.h"
#include "AliEMCALGeometry.h"
-#include "AliEMCALDigitizer.h"
+class AliEMCALDigitizer;
#include "AliEMCALDigit.h"
-
-
+#include "AliEMCAL.h"
+#include "AliCaloCalibPedestal.h"
+
ClassImp(AliEMCALRawUtils)
-
+
// Signal shape parameters
+Int_t AliEMCALRawUtils::fgTimeBins = 256; // number of sampling bins of the raw RO signal (we typically use 15-50; theoretical max is 1k+)
Double_t AliEMCALRawUtils::fgTimeBinWidth = 100E-9 ; // each sample is 100 ns
Double_t AliEMCALRawUtils::fgTimeTrigger = 1.5E-6 ; // 15 time bins ~ 1.5 musec
// some digitization constants
Int_t AliEMCALRawUtils::fgThreshold = 1;
Int_t AliEMCALRawUtils::fgDDLPerSuperModule = 2; // 2 ddls per SuperModule
+Int_t AliEMCALRawUtils::fgPedestalValue = 32; // pedestal value for digits2raw
+Double_t AliEMCALRawUtils::fgFEENoise = 3.; // 3 ADC channels of noise (sampled)
AliEMCALRawUtils::AliEMCALRawUtils()
: fHighLowGainFactor(0.), fOrder(0), fTau(0.), fNoiseThreshold(0),
fHighLowGainFactor = 16. ; // adjusted for a low gain range of 82 GeV (10 bits)
fOrder = 2; // order of gamma fn
fTau = 2.35; // in units of timebin, from CERN 2007 testbeam
- fNoiseThreshold = 3;
- fNPedSamples = 5;
+ fNoiseThreshold = 3; // 3 ADC counts is approx. noise level
+ fNPedSamples = 4; // less than this value => likely pedestal samples
//Get Mapping RCU files from the AliEMCALRecParam
const TObjArray* maps = AliEMCALRecParam::GetMappings();
if(!maps) AliFatal("Cannot retrieve ALTRO mappings!!");
- for(Int_t i = 0; i < 2; i++) {
+ for(Int_t i = 0; i < 4; i++) {
fMapping[i] = (AliAltroMapping*)maps->At(i);
}
//To make sure we match with the geometry in a simulation file,
//let's try to get it first. If not, take the default geometry
- AliRunLoader *rl = AliRunLoader::GetRunLoader();
+ AliRunLoader *rl = AliRunLoader::Instance();
+ if(!rl) AliError("Cannot find RunLoader!");
if (rl->GetAliRun() && rl->GetAliRun()->GetDetector("EMCAL")) {
fGeom = dynamic_cast<AliEMCAL*>(rl->GetAliRun()->GetDetector("EMCAL"))->GetGeometry();
} else {
}
+//____________________________________________________________________________
+AliEMCALRawUtils::AliEMCALRawUtils(AliEMCALGeometry *pGeometry)
+ : fHighLowGainFactor(0.), fOrder(0), fTau(0.), fNoiseThreshold(0),
+ fNPedSamples(0), fGeom(pGeometry), fOption("")
+{
+ //
+ // Initialize with the given geometry - constructor required by HLT
+ // HLT does not use/support AliRunLoader(s) instances
+ // This is a minimum intervention solution
+ // Comment by MPloskon@lbl.gov
+ //
+
+ //These are default parameters.
+ //Can be re-set from without with setter functions
+ fHighLowGainFactor = 16. ; // adjusted for a low gain range of 82 GeV (10 bits)
+ fOrder = 2; // order of gamma fn
+ fTau = 2.35; // in units of timebin, from CERN 2007 testbeam
+ fNoiseThreshold = 3; // 3 ADC counts is approx. noise level
+ fNPedSamples = 4; // less than this value => likely pedestal samples
+
+ //Get Mapping RCU files from the AliEMCALRecParam
+ const TObjArray* maps = AliEMCALRecParam::GetMappings();
+ if(!maps) AliFatal("Cannot retrieve ALTRO mappings!!");
+
+ for(Int_t i = 0; i < 4; i++) {
+ fMapping[i] = (AliAltroMapping*)maps->At(i);
+ }
+
+ if(!fGeom) AliFatal(Form("Could not get geometry!"));
+
+}
+
//____________________________________________________________________________
AliEMCALRawUtils::AliEMCALRawUtils(const AliEMCALRawUtils& rawU)
: TObject(),
//copy ctor
fMapping[0] = rawU.fMapping[0];
fMapping[1] = rawU.fMapping[1];
+ fMapping[2] = rawU.fMapping[2];
+ fMapping[3] = rawU.fMapping[3];
}
//____________________________________________________________________________
fOption = rawU.fOption;
fMapping[0] = rawU.fMapping[0];
fMapping[1] = rawU.fMapping[1];
+ fMapping[2] = rawU.fMapping[2];
+ fMapping[3] = rawU.fMapping[3];
}
return *this;
//____________________________________________________________________________
AliEMCALRawUtils::~AliEMCALRawUtils() {
+ //dtor
}
{
// convert digits of the current event to raw data
- AliRunLoader *rl = AliRunLoader::GetRunLoader();
+ AliRunLoader *rl = AliRunLoader::Instance();
AliEMCALLoader *loader = dynamic_cast<AliEMCALLoader*>(rl->GetDetectorLoader("EMCAL"));
// get the digits
for (Int_t i=0; i < nDDL; i++)
buffers[i] = 0;
- Int_t adcValuesLow[fgkTimeBins];
- Int_t adcValuesHigh[fgkTimeBins];
+ TArrayI adcValuesLow(fgTimeBins);
+ TArrayI adcValuesHigh(fgTimeBins);
// loop over digits (assume ordered digits)
for (Int_t iDigit = 0; iDigit < digits->GetEntries(); iDigit++) {
fGeom->GetCellIndex(digit->GetId(), nSM, nModule, nIphi, nIeta);
fGeom->GetCellPhiEtaIndexInSModule(nSM, nModule, nIphi, nIeta,iphi, ieta) ;
- //Check which is the RCU of the cell.
+ //Check which is the RCU, 0 or 1, of the cell.
Int_t iRCU = -111;
//RCU0
if (0<=iphi&&iphi<8) iRCU=0; // first cable row
else if(8<=iphi&&iphi<16 && 24<=ieta&&ieta<48) iRCU=1; // second half;
//second cable row
else if(16<=iphi&&iphi<24) iRCU=1; // third cable row
+
+ if (nSM%2==1) iRCU = 1 - iRCU; // swap for odd=C side, to allow us to cable both sides the same
+
if (iRCU<0)
Fatal("Digits2Raw()","Non-existent RCU number: %d", iRCU);
if (buffers[iDDL] == 0) {
// open new file and write dummy header
TString fileName = AliDAQ::DdlFileName("EMCAL",iDDL);
- buffers[iDDL] = new AliAltroBuffer(fileName.Data(),fMapping[iRCU]);
+ //Select mapping file RCU0A, RCU0C, RCU1A, RCU1C
+ Int_t iRCUside=iRCU+(nSM%2)*2;
+ //iRCU=0 and even (0) SM -> RCU0A.data 0
+ //iRCU=1 and even (0) SM -> RCU1A.data 1
+ //iRCU=0 and odd (1) SM -> RCU0C.data 2
+ //iRCU=1 and odd (1) SM -> RCU1C.data 3
+ //cout<<" nSM "<<nSM<<"; iRCU "<<iRCU<<"; iRCUside "<<iRCUside<<endl;
+ buffers[iDDL] = new AliAltroBuffer(fileName.Data(),fMapping[iRCUside]);
buffers[iDDL]->WriteDataHeader(kTRUE, kFALSE); //Dummy;
}
buffers[iDDL]->WriteTrailer(3, ieta, iphi, nSM); // trailer
// calculate the time response function
} else {
- Bool_t lowgain = RawSampledResponse(digit->GetTimeR(), digit->GetAmp(), adcValuesHigh, adcValuesLow) ;
+ Bool_t lowgain = RawSampledResponse(digit->GetTimeR(), digit->GetAmp(), adcValuesHigh.GetArray(), adcValuesLow.GetArray()) ;
if (lowgain)
- buffers[iDDL]->WriteChannel(ieta, iphi, 0, GetRawFormatTimeBins(), adcValuesLow, fgThreshold);
+ buffers[iDDL]->WriteChannel(ieta, iphi, 0, GetRawFormatTimeBins(), adcValuesLow.GetArray(), fgThreshold);
else
- buffers[iDDL]->WriteChannel(ieta,iphi, 1, GetRawFormatTimeBins(), adcValuesHigh, fgThreshold);
+ buffers[iDDL]->WriteChannel(ieta,iphi, 1, GetRawFormatTimeBins(), adcValuesHigh.GetArray(), fgThreshold);
}
}
}
//____________________________________________________________________________
-void AliEMCALRawUtils::Raw2Digits(AliRawReader* reader,TClonesArray *digitsArr)
+void AliEMCALRawUtils::Raw2Digits(AliRawReader* reader,TClonesArray *digitsArr, AliCaloCalibPedestal* pedbadmap)
{
// convert raw data of the current event to digits
return;
}
- AliCaloRawStream in(reader,"EMCAL",fMapping);
+ AliCaloRawStreamV3 in(reader,"EMCAL",fMapping);
// Select EMCAL DDL's;
- reader->Select("EMCAL");
-
- TString option = GetOption();
- if (option.Contains("OldRCUFormat"))
- in.SetOldRCUFormat(kTRUE); // Needed for testbeam data
- else
- in.SetOldRCUFormat(kFALSE);
-
+ reader->Select("EMCAL",0,43); // 43 = AliEMCALGeoParams::fgkLastAltroDDL
//Updated fitting routine from 2007 beam test takes into account
//possibility of two peaks in data and selects first one for fitting
//given raw signal being fit
TF1 * signalF = new TF1("signal", RawResponseFunction, 0, GetRawFormatTimeBins(), 5);
- signalF->SetParameters(10.,0.,fTau,fOrder,5.); //set all defaults once, just to be safe
+ signalF->SetParameters(10.,5.,fTau,fOrder,0.); //set all defaults once, just to be safe
signalF->SetParNames("amp","t0","tau","N","ped");
- signalF->SetParameter(2,fTau); // tau in units of time bin
- signalF->SetParLimits(2,2,-1);
- signalF->SetParameter(3,fOrder); // order
- signalF->SetParLimits(3,2,-1);
+ signalF->FixParameter(2,fTau); // tau in units of time bin
+ signalF->FixParameter(3,fOrder); // order
Int_t id = -1;
Float_t time = 0. ;
Float_t amp = 0. ;
+ Float_t ped = 0. ;
+ Float_t ampEstimate = 0;
+ Float_t timeEstimate = 0;
+ Float_t pedEstimate = 0;
+ Int_t i = 0;
+ Int_t startBin = 0;
//Graph to hold data we will fit (should be converted to an array
//later to speed up processing
TGraph * gSig = new TGraph(GetRawFormatTimeBins());
- Int_t readOk = 1;
Int_t lowGain = 0;
-
- while (readOk && in.GetModule() < 0)
- readOk = in.Next(); // Go to first digit
-
- Int_t col = 0;
- Int_t row = 0;
-
- while (readOk) {
- id = fGeom->GetAbsCellIdFromCellIndexes(in.GetModule(), in.GetRow(), in.GetColumn()) ;
- lowGain = in.IsLowGain();
- Int_t maxTime = in.GetTime(); // timebins come in reverse order
- if (maxTime < 0 || maxTime >= GetRawFormatTimeBins()) {
- AliWarning(Form("Invalid time bin %d",maxTime));
- maxTime = GetRawFormatTimeBins();
- }
- gSig->Set(maxTime+1);
- // There is some kind of zero-suppression in the raw data,
- // so set up the TGraph in advance
- for (Int_t i=0; i < maxTime; i++) {
- gSig->SetPoint(i, i , 0);
- }
-
- Int_t iTime = 0;
- do {
- if (in.GetTime() >= gSig->GetN()) {
- AliWarning("Too many time bins");
- gSig->Set(in.GetTime());
+ Int_t caloFlag = 0; // low, high gain, or TRU, or LED ref.
+
+ // start loop over input stream
+ while (in.NextDDL()) {
+ while (in.NextChannel()) {
+
+ //Check if the signal is high or low gain and then do the fit,
+ //if it is from TRU do not fit
+ caloFlag = in.GetCaloFlag();
+ if (caloFlag != 0 && caloFlag != 1) continue;
+
+ //Do not fit bad channels
+ if(pedbadmap->IsBadChannel(in.GetModule(),in.GetColumn(),in.GetRow())) {
+ //printf("Tower from SM %d, column %d, row %d is BAD!!! Skip \n", in.GetModule(),in.GetColumn(),in.GetRow());
+ continue;
+ }
+
+ // There can be zero-suppression in the raw data,
+ // so set up the TGraph in advance
+ for (i=0; i < GetRawFormatTimeBins(); i++) {
+ gSig->SetPoint(i, i , -1); // init to out-of-range values
}
- col = in.GetColumn();
- row = in.GetRow();
-
- gSig->SetPoint(in.GetTime(), in.GetTime(), in.GetSignal()) ;
- if (in.GetTime() > maxTime)
- maxTime = in.GetTime();
- iTime++;
- } while ((readOk = in.Next()) && !in.IsNewHWAddress());
- FitRaw(gSig, signalF, amp, time) ;
-
- if (amp > 0) {
- AliDebug(2,Form("id %d lowGain %d amp %g", id, lowGain, amp));
- //cout << "col " << col-40 << " row " << row-8 << " lowGain " << lowGain << " amp " << amp << endl;
- AddDigit(digitsArr, id, lowGain, (Int_t)amp, time);
- }
+ Int_t maxTimeBin = 0;
+ Int_t min = 0x3ff; // init to 10-bit max
+ Int_t max = 0; // init to 10-bit min
+ while (in.NextBunch()) {
+
+ const UShort_t *sig = in.GetSignals();
+ startBin = in.GetStartTimeBin();
+ if (maxTimeBin < startBin) {
+ maxTimeBin = startBin; // timebins come in reverse order
+ }
+ if (maxTimeBin < 0 || maxTimeBin >= GetRawFormatTimeBins()) {
+ AliWarning(Form("Invalid time bin %d",maxTimeBin));
+ maxTimeBin = GetRawFormatTimeBins();
+ }
- // Reset graph
- for (Int_t index = 0; index < gSig->GetN(); index++) {
- gSig->SetPoint(index, index, 0) ;
- }
- // Reset starting parameters for fit function
- signalF->SetParameters(10.,0.,fTau,fOrder,5.); //reset all defaults just to be safe
-
- }; // EMCAL entries loop
+ for (i = 0; i < in.GetBunchLength(); i++) {
+ time = startBin--;
+ gSig->SetPoint((Int_t)time, time, (Double_t) sig[i]) ;
+ if (max < sig[i]) max = sig[i];
+ if (min > sig[i]) min = sig[i];
+
+ }
+ } // loop over bunches
+
+ gSig->Set(maxTimeBin+1); // set actual max size of TGraph
+
+ //Initialize the variables, do not keep previous values.
+ // not really necessary to reset all of them (only amp and time at the moment), but better safe than sorry
+ amp = -1 ;
+ time = -1 ;
+ ped = -1;
+ ampEstimate = -1 ;
+ timeEstimate = -1 ;
+ pedEstimate = -1;
+ if ( (max - min) > fNoiseThreshold) {
+ FitRaw(gSig, signalF, maxTimeBin, amp, time, ped,
+ ampEstimate, timeEstimate, pedEstimate);
+ }
+
+ if ( amp>0 && amp<2000 && time>0 && time<(maxTimeBin*GetRawFormatTimeBinWidth()) ) { //check both high and low end of amplitude result, and time
+ //2000 is somewhat arbitrary - not nice with magic numbers in the code..
+ id = fGeom->GetAbsCellIdFromCellIndexes(in.GetModule(), in.GetRow(), in.GetColumn()) ;
+ lowGain = in.IsLowGain();
+
+ // check fit results: should be consistent with initial estimates
+ // more magic numbers, but very loose cuts, for now..
+ // We have checked that amp an time values are positive so division for assymmetry
+ // calculation should be OK/safe
+ Float_t ampAsymm = (amp - ampEstimate)/(amp + ampEstimate);
+ if ( (TMath::Abs(ampAsymm) > 0.1) ||
+ (TMath::Abs(time - timeEstimate) > 2*GetRawFormatTimeBinWidth()) ) {
+ AliDebug(2,Form("Fit results ped %f amp %f time %f not consistent with expectations ped %f max-ped %f time %d",
+ ped, amp, time, pedEstimate, ampEstimate, timeEstimate));
+
+ // what should do we do then? skip this channel or assign the simple estimate?
+ // for now just overwrite the fit results with the simple estimate
+ amp = ampEstimate;
+ time = timeEstimate;
+ }
+
+ AliDebug(2,Form("id %d lowGain %d amp %g", id, lowGain, amp));
+ // printf("Added tower: SM %d, row %d, column %d, amp %3.2f\n",in.GetModule(), in.GetRow(), in.GetColumn(),amp);
+ // round off amplitude value to nearest integer
+ AddDigit(digitsArr, id, lowGain, TMath::Nint(amp), time);
+ }
+
+ // Reset graph
+ for (Int_t index = 0; index < gSig->GetN(); index++) {
+ gSig->SetPoint(index, index, -1) ;
+ }
+ // Reset starting parameters for fit function
+ signalF->SetParameters(10.,5.,fTau,fOrder,0.); //reset all defaults just to be safe
+
+ } // end while over channel
+ } //end while over DDL's, of input stream
delete signalF ;
delete gSig;
// Called by Raw2Digits
AliEMCALDigit *digit = 0, *tmpdigit = 0;
-
TIter nextdigit(digitsArr);
while (digit == 0 && (tmpdigit = (AliEMCALDigit*) nextdigit())) {
if (tmpdigit->GetId() == id)
}
if (!digit) { // no digit existed for this tower; create one
- if (lowGain)
+ if (lowGain && amp > fgkOverflowCut)
amp = Int_t(fHighLowGainFactor * amp);
Int_t idigit = digitsArr->GetEntries();
new((*digitsArr)[idigit]) AliEMCALDigit( -1, -1, id, amp, time, idigit) ;
}
//____________________________________________________________________________
-void AliEMCALRawUtils::FitRaw(TGraph * gSig, TF1* signalF, Float_t & amp, Float_t & time)
+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
{
// Fits the raw signal time distribution; from AliEMCALGetter
+ // last argument: Float_t cut = 0.0; // indicating how much of amplitude w.r.t. max value fit should be above noise and pedestal
+
+ // initialize return values
+ amp = 0;
+ time = 0;
+ ped = 0;
+ ampEstimate = 0;
+ timeEstimate = 0;
+ pedEstimate = 0;
+
+ // 0th step: remove plateau / overflow candidates
+ // before trying to estimate amplitude, search for maxima etc.
+ //
+ Int_t nOrig = gSig->GetN(); // number of samples before we remove any overflows
+ // Values for readback from input graph
+ Double_t ttime = 0;
+ Double_t signal = 0;
+
+ /*
+ // start: tmp dump of all values
+ for (Int_t i=0; i<gSig->GetN(); i++) {
+ gSig->GetPoint(i, ttime, signal) ; // get values
+ printf("orig: i %d, time %f, signal %f\n",i, ttime, signal);
+ }
+ // end: tmp dump of all values
+ */
+
+ // start from back of TGraph since RemovePoint will downshift indices
+ for (Int_t i=nOrig-1; i>=0; i--) {
+ gSig->GetPoint(i, ttime, signal) ; // get values
+ if (signal >= (pedEstimate + fgkOverflowCut) ) {
+ gSig->RemovePoint(i);
+ }
+ }
- amp = time = 0. ;
- Double_t ped = 0;
+ // 1st step: we try to estimate the pedestal value
Int_t nPed = 0;
-
- for (Int_t index = 0; index < fNPedSamples; index++) {
- Double_t ttime, signal;
+ for (Int_t index = 0; index < gSig->GetN(); index++) {
gSig->GetPoint(index, ttime, signal) ;
- if (signal > 0) {
- ped += signal;
+ // ttime < fNPedsamples used for pedestal estimate;
+ // ttime >= fNPedSamples used for signal checks
+ if (signal >= 0 && ttime<fNPedSamples) { // valid value
+ pedEstimate += signal;
nPed++;
}
}
if (nPed > 0)
- ped /= nPed;
+ pedEstimate /= nPed;
else {
- AliWarning("Could not determine pedestal");
- ped = 10; // put some small value as first guess
+ //AliWarning("Could not determine pedestal");
+ AliDebug(1,"Could not determine pedestal");
+ pedEstimate = 0; // good estimate for ZeroSupp data (non ZS data should have no problem with pedestal estimate)
}
- Int_t max_found = 0;
- Int_t i_max = 0;
- Float_t max = -1;
- Float_t max_fit = gSig->GetN();
- Float_t min_after_sig = 9999;
- Int_t tmin_after_sig = gSig->GetN();
- Int_t n_ped_after_sig = 0;
-
- for (Int_t i=fNPedSamples; i < gSig->GetN(); i++) {
- Double_t ttime, signal;
- gSig->GetPoint(i, ttime, signal) ;
- if (!max_found && signal > max) {
- i_max = i;
- max = signal;
+ // 2nd step: we look through the rest of the time-bins/ADC values and
+ // see if we have something that looks like a signal.
+ // We look for a first local maxima, as well as for a global maxima
+ Int_t locMaxFound = 0;
+ Int_t locMaxId = 0; // time-bin index at first local max
+ Float_t locMaxSig = -1; // actual local max value
+ Int_t globMaxId = 0; // time-bin index at global max
+ Float_t globMaxSig = -1; // actual global max value
+ // We will also look for any values that look like they are in overflow region
+ for (Int_t i=0; i<gSig->GetN(); i++) {
+ gSig->GetPoint(i, ttime, signal) ; // get values
+
+ // ttime < fNPedsamples used for pedestal estimate;
+ // ttime >= fNPedSamples used for signal checks
+ if (ttime >= fNPedSamples) {
+
+ // look for first local maximum signal=ADC value
+ if (!locMaxFound && signal > locMaxSig) {
+ locMaxId = i;
+ locMaxSig = signal;
+ }
+ else if ( locMaxSig > (pedEstimate + fNoiseThreshold) ) {
+ // we enter this condition after signal<=max, but previous
+ // max value was large enough. I.e. at least a significant local
+ // maxima has been found (just before)
+ locMaxFound = 1;
+ }
+
+ // also check for global maximum..
+ if (signal > globMaxSig) {
+ globMaxId = i;
+ globMaxSig = signal;
+ }
+ } // ttime check
+ } // end for-loop over samples after pedestal
+
+ // OK, we have looked through the signal spectra, let's see if we should try to make the fit
+ ampEstimate = locMaxSig - pedEstimate; // estimate using first local maxima
+ if ( ampEstimate > fNoiseThreshold ) { // else it's just noise
+
+ //Check that the local maximum we will use is not at the end or beginning of time sample range
+ Double_t timeMax = -1;
+ Int_t iMax = locMaxId;
+ gSig->GetPoint(locMaxId, timeMax, signal) ;
+ if (timeMax < 2 || timeMax > lastTimeBin-1) { // lastTimeBin is the lowest kept time-sample; current (Dec 2009) case
+ // if (timeMax < 2 || timeMax > lastTimeBin-2) { // for when lastTimeBin is the lowest read-out time-sample, future (2010) case
+ AliDebug(1,Form("Skip fit, maximum of the sample close to the edges : timeMax %3.2f, ampEstimate %3.2f",timeMax, ampEstimate));
+ return;
}
- else if ( max > ped + fNoiseThreshold ) {
- max_found = 1;
- min_after_sig = signal;
- tmin_after_sig = i;
+
+ // Check if the local and global maximum disagree
+ if (locMaxId != globMaxId) {
+ AliDebug(1,Form("Warning, local first maximum %d does not agree with global maximum %d\n", locMaxId, globMaxId));
+ return;
}
- if (max_found) {
- if ( signal < min_after_sig) {
- min_after_sig = signal;
- tmin_after_sig = i;
- }
- if (i > tmin_after_sig + 5) { // Two close peaks; end fit at minimum
- max_fit = tmin_after_sig;
- break;
+
+ // Get the maximum and find the lowest timebin (tailmin) where the ADC value is not
+ // significantly different from the pedestal
+ // first lower times edge a.k.a. tailmin
+ Int_t tailMin = 0;
+ Double_t tmptime = 0;
+ for (Int_t i=iMax-1; i > 0; i--) {
+ gSig->GetPoint(i, tmptime, signal) ;
+ if((signal-pedEstimate) < fNoiseThreshold){
+ tailMin = i;
+ break;
}
- if ( signal < ped + fNoiseThreshold)
- n_ped_after_sig++;
- if (n_ped_after_sig >= 5) { // include 5 pedestal bins after peak
- max_fit = i;
- break;
+ }
+ // then same exercise for the higher times edge a.k.a. tailmax
+ Int_t tailMax = lastTimeBin;
+ for (Int_t i=iMax+1; i < gSig->GetN(); i++) {
+ gSig->GetPoint(i, tmptime, signal) ;
+ 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)
+ tailMax = i;
+ break;
}
}
- }
- if ( max - ped > fNoiseThreshold ) { // else its noise
- AliDebug(2,Form("Fitting max %d ped %d", max, ped));
- signalF->SetRange(0,max_fit);
+ // remove all points which are not in the distribution around maximum
+ // i.e. up to tailmin, and from tailmax
+ if ( tailMax != (gSig->GetN()-1) ){ // else nothing to remove
+ nOrig = gSig->GetN(); // can't use GetN call in for loop below since gSig size changes..
+ for(int j = tailMax; j < nOrig; j++) gSig->RemovePoint(tailMax);
+ }
+ for(int j = 0; j<=tailMin; j++) gSig->RemovePoint(0);
+
+ if(gSig->GetN() < 3) {
+ AliDebug(2,Form("Skip fit, number of entries in sample smaller than number of fitting parameters: in sample %d, fitting param 3",
+ gSig->GetN() ));
+ return;
+ }
+
+ timeEstimate = timeMax * GetRawFormatTimeBinWidth();
- if(max-ped > 50)
- signalF->SetParLimits(2,1,3);
+ // determine what the valid fit range is
+ Double_t minFit = 9999;
+ Double_t maxFit = 0;
+ for (Int_t i=0; i < gSig->GetN(); i++) {
+ gSig->GetPoint(i, ttime, signal);
+ if (minFit > ttime) minFit=ttime;
+ if (maxFit < ttime) maxFit=ttime;
+ //debug: printf("no tail: i %d, time %f, signal %f\n",i, ttime, signal);
+ }
+ signalF->SetRange(minFit, maxFit);
- signalF->SetParameter(4, ped) ;
- signalF->SetParameter(1, i_max);
- signalF->SetParameter(0, max);
+ signalF->FixParameter(4, pedEstimate) ;
+ signalF->SetParameter(1, timeMax);
+ signalF->SetParameter(0, ampEstimate);
gSig->Fit(signalF, "QROW"); // Note option 'W': equal errors on all points
+
+ // assign fit results
amp = signalF->GetParameter(0);
- time = signalF->GetParameter(1)*GetRawFormatTimeBinWidth() - fgTimeTrigger;
- }
+ time = signalF->GetParameter(1) * GetRawFormatTimeBinWidth(); // skip subtraction of fgTimeTrigger?
+ ped = signalF->GetParameter(4);
+
+ //BEG YS alternative methods to calculate the amplitude
+ Double_t * ymx = gSig->GetX() ;
+ Double_t * ymy = gSig->GetY() ;
+ const Int_t kN = 3 ;
+ Double_t ymMaxX[kN] = {0., 0., 0.} ;
+ Double_t ymMaxY[kN] = {0., 0., 0.} ;
+ Double_t ymax = 0. ;
+ // find the maximum amplitude
+ Int_t ymiMax = 0 ;
+ for (Int_t ymi = 0; ymi < gSig->GetN(); ymi++) {
+ if (ymy[ymi] > ymMaxY[0] ) {
+ ymMaxY[0] = ymy[ymi] ; //<========== This is the maximum amplitude
+ ymMaxX[0] = ymx[ymi] ;
+ ymiMax = ymi ;
+ }
+ }
+ // find the maximum by fitting a parabola through the max and the two adjacent samples
+ if ( ymiMax < gSig->GetN()-1 && ymiMax > 0) {
+ ymMaxY[1] = ymy[ymiMax+1] ;
+ ymMaxY[2] = ymy[ymiMax-1] ;
+ ymMaxX[1] = ymx[ymiMax+1] ;
+ ymMaxX[2] = ymx[ymiMax-1] ;
+ if (ymMaxY[0]*ymMaxY[1]*ymMaxY[2] > 0) {
+ //fit a parabola through the 3 points y= a+bx+x*x*x
+ Double_t sy = 0 ;
+ Double_t sx = 0 ;
+ Double_t sx2 = 0 ;
+ Double_t sx3 = 0 ;
+ Double_t sx4 = 0 ;
+ Double_t sxy = 0 ;
+ Double_t sx2y = 0 ;
+ for (Int_t i = 0; i < kN ; i++) {
+ sy += ymMaxY[i] ;
+ sx += ymMaxX[i] ;
+ sx2 += ymMaxX[i]*ymMaxX[i] ;
+ sx3 += ymMaxX[i]*ymMaxX[i]*ymMaxX[i] ;
+ sx4 += ymMaxX[i]*ymMaxX[i]*ymMaxX[i]*ymMaxX[i] ;
+ sxy += ymMaxX[i]*ymMaxY[i] ;
+ sx2y += ymMaxX[i]*ymMaxX[i]*ymMaxY[i] ;
+ }
+ Double_t cN = (sx2y*kN-sy*sx2)*(sx3*sx-sx2*sx2)-(sx2y*sx-sxy*sx2)*(sx3*kN-sx*sx2);
+ Double_t cD = (sx4*kN-sx2*sx2)*(sx3*sx-sx2*sx2)-(sx4*sx-sx3*sx2)*(sx3*kN-sx*sx2) ;
+ Double_t c = cN / cD ;
+ Double_t b = ((sx2y*kN-sy*sx2)-c*(sx4*kN-sx2*sx2))/(sx3*kN-sx*sx2) ;
+ Double_t a = (sy-b*sx-c*sx2)/kN ;
+ Double_t xmax = -b/(2*c) ;
+ ymax = a + b*xmax + c*xmax*xmax ;//<========== This is the maximum amplitude
+ }
+ }
+
+ Double_t diff = TMath::Abs(1-ymMaxY[0]/amp) ;
+ if (diff > 0.1)
+ amp = ymMaxY[0] ;
+
+ //END YS
+
+ } // ampEstimate > fNoiseThreshold
return;
}
//__________________________________________________________________
// Shape of the electronics raw reponse:
// It is a semi-gaussian, 2nd order Gamma function of the general form
//
- // t' = (t - t0 + tau) / tau
- // F = A * t**N * exp( N * ( 1 - t) ) for t >= 0
- // F = 0 for t < 0
+ // xx = (t - t0 + tau) / tau [xx is just a convenient help variable]
+ // F = A * (xx**N * exp( N * ( 1 - xx) ) for xx >= 0
+ // F = 0 for xx < 0
//
// parameters:
// A: par[0] // Amplitude = peak value
//
Double_t signal ;
Double_t tau =par[2];
- Double_t N =par[3];
+ Double_t n =par[3];
Double_t ped = par[4];
Double_t xx = ( x[0] - par[1] + tau ) / tau ;
if (xx <= 0)
signal = ped ;
else {
- signal = ped + par[0] * TMath::Power(xx , N) * TMath::Exp(N * (1 - xx )) ;
+ signal = ped + par[0] * TMath::Power(xx , n) * TMath::Exp(n * (1 - xx )) ;
}
return signal ;
}
// for a start time dtime and an amplitude damp given by digit,
// calculates the raw sampled response AliEMCAL::RawResponseFunction
- const Int_t pedVal = 32;
Bool_t lowGain = kFALSE ;
// A: par[0] // Amplitude = peak value
// N: par[3]
// ped: par[4]
- TF1 signalF("signal", RawResponseFunction, 0, GetRawFormatTimeMax(), 5);
+ TF1 signalF("signal", RawResponseFunction, 0, GetRawFormatTimeBins(), 5);
signalF.SetParameter(0, damp) ;
- signalF.SetParameter(1, dtime + fgTimeTrigger) ;
+ signalF.SetParameter(1, (dtime + fgTimeTrigger)/fgTimeBinWidth) ;
signalF.SetParameter(2, fTau) ;
signalF.SetParameter(3, fOrder);
- signalF.SetParameter(4, pedVal);
+ signalF.SetParameter(4, fgPedestalValue);
for (Int_t iTime = 0; iTime < GetRawFormatTimeBins(); iTime++) {
- Double_t time = iTime * GetRawFormatTimeBinWidth() ;
- Double_t signal = signalF.Eval(time) ;
+ Double_t signal = signalF.Eval(iTime) ;
+
+ // Next lines commeted for the moment but in principle it is not necessary to add
+ // extra noise since noise already added at the digits level.
+
+ //According to Terry Awes, 13-Apr-2008
+ //add gaussian noise in quadrature to each sample
+ //Double_t noise = gRandom->Gaus(0.,fgFEENoise);
+ //signal = sqrt(signal*signal + noise*noise);
+
+ // March 17,09 for fast fit simulations by Alexei Pavlinov.
+ // Get from PHOS analysis. In some sense it is open questions.
+ //Double_t noise = gRandom->Gaus(0.,fgFEENoise);
+ //signal += noise;
+
adcH[iTime] = static_cast<Int_t>(signal + 0.5) ;
if ( adcH[iTime] > fgkRawSignalOverflow ){ // larger than 10 bits
adcH[iTime] = fgkRawSignalOverflow ;
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff