/* History of cvs commits:
*
* $Log$
+ * 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.
* */
ClassImp(AliEMCALRawUtils)
// Signal shape parameters
-Int_t AliEMCALRawUtils::fgOrder = 2 ; // Order of gamma function
-Double_t AliEMCALRawUtils::fgTimeMax = 2.56E-5 ; // each sample is over 100 ns fTimeMax/fTimeBins
-Double_t AliEMCALRawUtils::fgTau = 165E-9 ; // 165 ns (from testbeam; not very accurate)
+Int_t AliEMCALRawUtils::fgOrder = 2 ; // Order of gamma function
+Double_t AliEMCALRawUtils::fgTimeBinWidth = 100E-9 ; // each sample is 100 ns
+Double_t AliEMCALRawUtils::fgTau = 235E-9 ; // 235 ns (from CERN testbeam; not very accurate)
Double_t AliEMCALRawUtils::fgTimeTrigger = 1.5E-6 ; // 15 time bins ~ 1.5 musec
// some digitization constants
// reading is from previously existing AliEMCALGetter.cxx
// ReadRaw method
TF1 * signalF = new TF1("signal", RawResponseFunction, 0, GetRawFormatTimeMax(), 4);
- signalF->SetParNames("Charge", "Gain", "Amplitude", "TimeZero");
Int_t id = -1;
- Int_t idigit = 0 ;
- Double_t time = 0. ;
- Double_t amp = 0. ;
+ Float_t time = 0. ;
+ Float_t amp = 0. ;
TGraph * gSig = new TGraph(GetRawFormatTimeBins()) ;
- Int_t eofReached = 0;
+ Int_t readOk = 1;
Int_t lowGain = 0;
- in.Next(); // Go to first digit
- do {
+ while (readOk && in.GetModule() < 0)
+ readOk = in.Next(); // Go to first digit
+ while (readOk) {
id = geom->GetAbsCellIdFromCellIndexes(in.GetModule(), in.GetRow(), in.GetColumn()) ;
lowGain = in.IsLowGain();
- gSig->SetPoint(in.GetTime(),
- in.GetTime()* GetRawFormatTimeMax() / GetRawFormatTimeBins(),
- in.GetSignal()) ;
+ Int_t nTime = in.GetTimeLength()-1;
+ Int_t maxTime = in.GetTime(); // timebins come in reverse order
+ 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 * GetRawFormatTimeBinWidth(), 0);
+ }
- Int_t iTime = 1;
+ Int_t iTime = 0;
do {
- if (!in.Next())
- eofReached = 1;
- else {
- gSig->SetPoint(in.GetTime(),
- in.GetTime()* GetRawFormatTimeMax() / GetRawFormatTimeBins(),
- in.GetSignal()) ;
+ if (in.GetTime() >= gSig->GetN()) {
+ AliWarning("Too many time bins");
+ gSig->Set(in.GetTime());
}
+ gSig->SetPoint(in.GetTime(),
+ in.GetTime() * GetRawFormatTimeBinWidth(),
+ in.GetSignal()) ;
+ if (in.GetTime() > maxTime)
+ maxTime = in.GetTime();
iTime++;
- } while (!eofReached && !in.IsNewRow() && !in.IsNewColumn() && !in.IsNewModule());
+ } while ((readOk = in.Next()) && !in.IsNewHWAddress());
+ signalF->SetRange(0,(Float_t)maxTime*GetRawFormatTimeBinWidth());
FitRaw(gSig, signalF, amp, time) ;
- if (lowGain)
- amp *= fHighLowGainFactor;
if (amp > 0) {
- AliDebug(2,Form("id %d amp %g", id, amp));
- new((*digitsArr)[idigit]) AliEMCALDigit( -1, -1, id, (Int_t)amp, time, idigit) ;
- idigit++ ;
+ AliDebug(2,Form("id %d lowGain %d amp %g", id, lowGain, amp));
+ AddDigit(digitsArr, id, lowGain, (Int_t)amp, time);
}
- Int_t index ;
// Reset graph
- for (index = 0; index < GetRawFormatTimeBins(); index++) {
- gSig->SetPoint(index, index * GetRawFormatTimeMax() / GetRawFormatTimeBins(), 0) ;
+ for (Int_t index = 0; index < gSig->GetN(); index++) {
+ gSig->SetPoint(index, index * GetRawFormatTimeBinWidth(), 0) ;
}
- } while (!eofReached); // EMCAL entries loop
+ }; // EMCAL entries loop
delete signalF ;
delete gSig;
}
//____________________________________________________________________________
-void AliEMCALRawUtils::FitRaw(TGraph * gSig, TF1* signalF, Double_t & amp, Double_t & time)
+void AliEMCALRawUtils::AddDigit(TClonesArray *digitsArr, Int_t id, Int_t lowGain, Int_t amp, Float_t time) {
+ //
+ // Add a new digit.
+ // This routine checks whether a digit exists already for this tower
+ // and then decides whether to use the high or low gain info
+ //
+ // Called by Raw2Digits
+
+ AliEMCALDigit *digit = 0, *tmpdigit = 0;
+
+ TIter nextdigit(digitsArr);
+ while (digit == 0 && (tmpdigit = (AliEMCALDigit*) nextdigit())) {
+ if (tmpdigit->GetId() == id)
+ digit = tmpdigit;
+ }
+
+ if (!digit) { // no digit existed for this tower; create one
+ if (lowGain)
+ amp = Int_t(fHighLowGainFactor * amp);
+ Int_t idigit = digitsArr->GetEntries();
+ new((*digitsArr)[idigit]) AliEMCALDigit( -1, -1, id, amp, time, idigit) ;
+ }
+ else { // a digit already exists, check range
+ // (use high gain if signal < 800, otherwise low gain)
+ if (lowGain) { // new digit is low gain
+ if (digit->GetAmp() > 800) { // use if stored digit is out of range
+ digit->SetAmp(Int_t(fHighLowGainFactor * amp));
+ digit->SetTime(time);
+ }
+ }
+ else if (amp < 800) { // new digit is high gain; use if not out of range
+ digit->SetAmp(amp);
+ digit->SetTime(time);
+ }
+ }
+}
+
+//____________________________________________________________________________
+void AliEMCALRawUtils::FitRaw(TGraph * gSig, TF1* signalF, Float_t & amp, Float_t & time)
{
// Fits the raw signal time distribution; from AliEMCALGetter
- const Int_t kNoiseThreshold = 0 ;
+ const Int_t kNoiseThreshold = 5 ;
Double_t timezero1 = 0., timezero2 = 0., timemax = 0. ;
- Double_t signal = 0., signalmax = 0. ;
+ Double_t ttime, signal = 0., signalmax = 0. ;
amp = time = 0. ;
+ Double_t ped = 0;
+ Int_t nPed = 0;
timezero1 = signalmax = timemax = 0. ;
- timezero2 = GetRawFormatTimeMax();
+ timezero2 = 0;
Int_t index ;
- for (index = 0; index < GetRawFormatTimeBins(); index++) {
- gSig->GetPoint(index, time, signal) ;
- if (signal > kNoiseThreshold && timezero1 == 0.)
- timezero1 = time ;
- if (signal <= kNoiseThreshold && timezero1 > 0. && timezero2 == 0.)
- timezero2 = time ;
- if (signal > signalmax) {
+ for (index = 0; index < 10; index++) {
+ gSig->GetPoint(index, ttime, signal) ;
+ if (signal > 0) {
+ ped += signal;
+ nPed++;
+ }
+ }
+ if (nPed > 0)
+ ped /= nPed;
+ else
+ ped = 10; // put some small value as first guess
+
+ for (index = 0; index < gSig->GetN(); index++) {
+ gSig->GetPoint(index, ttime, signal) ;
+ if (signal > ped + kNoiseThreshold && timezero1 == 0.)
+ timezero1 = ttime ;
+ if (signal <= ped + kNoiseThreshold && timezero1 > 0. && timezero2 == 0.)
+ timezero2 = ttime ;
+ if (signal > signalmax && timezero2 == 0) {
signalmax = signal ;
- timemax = time ;
+ timemax = ttime ;
}
}
- if ( timemax < GetRawFormatTimeMax() * 0.4 ) { // else its noise
- signalF->SetParameter(0, signalmax) ;
- signalF->SetParameter(1, timemax) ;
+ AliDebug(2,Form("Fitting signalmax %d ped %d", signalmax, ped));
+ if ( signalmax - ped > kNoiseThreshold ) { // else its noise
+ signalF->SetParameter(0, ped) ;
+ signalF->SetParameter(1, signalmax - ped) ;
+ signalF->SetParameter(2, timemax) ;
gSig->Fit(signalF, "QRON", "", 0., timezero2); //, "QRON") ;
- amp = signalF->GetParameter(0) ;
- time = signalF->GetParameter(1) - fgTimeTrigger;
+ amp = signalF->GetParameter(1);
+ time = signalF->GetParameter(2) - fgTimeTrigger;
}
return;
}
// F = 0 for t < 0
//
// parameters:
- // A: par[0] // Amplitude = peak value
- // t0: par[1]
+ // ped: par[0]
+ // A: par[1] // Amplitude = peak value
+ // t0: par[2]
// tau: fgTau
// N: fgOrder
//
Double_t signal ;
- Double_t xx = ( x[0] - par[1] + fgTau ) / fgTau ;
+ Double_t xx = ( x[0] - par[2] + fgTau ) / fgTau ;
- if (xx < 0)
- signal = 0. ;
+ if (xx <= 0)
+ signal = par[0] ;
else {
- signal = par[0] * TMath::Power(xx , fgOrder) * TMath::Exp(fgOrder * (1 - xx )) ;
+ signal = par[0] + par[1] * TMath::Power(xx , fgOrder) * TMath::Exp(fgOrder * (1 - xx )) ;
+
}
return signal ;
}
// calculates the raw sampled response AliEMCAL::RawResponseFunction
const Int_t kRawSignalOverflow = 0x3FF ;
+ const Int_t pedVal = 32;
Bool_t lowGain = kFALSE ;
TF1 signalF("signal", RawResponseFunction, 0, GetRawFormatTimeMax(), 4);
- signalF.SetParameter(0, damp) ;
- signalF.SetParameter(1, dtime + fgTimeTrigger) ;
+ signalF.SetParameter(0, pedVal) ;
+ signalF.SetParameter(1, damp) ;
+ signalF.SetParameter(2, dtime + fgTimeTrigger) ;
for (Int_t iTime = 0; iTime < GetRawFormatTimeBins(); iTime++) {
- Double_t time = iTime * GetRawFormatTimeMax() / GetRawFormatTimeBins() ;
+ Double_t time = iTime * GetRawFormatTimeBinWidth() ;
Double_t signal = signalF.Eval(time) ;
adcH[iTime] = static_cast<Int_t>(signal + 0.5) ;
if ( adcH[iTime] > kRawSignalOverflow ){ // larger than 10 bits
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff