#include "AliPHOSSDigitizer.h"
#include "AliPHOSDigit.h"
#include "AliAltroBuffer.h"
+#include "AliLog.h"
ClassImp(AliPHOS)
+
+Double_t AliPHOS::fgCapa = 1.; // 1pF
+Int_t AliPHOS::fgOrder = 2 ;
+Double_t AliPHOS::fgTimeMax = 2.56E-5 ; // each sample is over 100 ns fTimeMax/fTimeBins
+Double_t AliPHOS::fgTimePeak = 4.1E-6 ; // 4 micro seconds
+Double_t AliPHOS::fgTimeTrigger = 100E-9 ; // 100ns, just for a reference
+
+
//____________________________________________________________________________
AliPHOS:: AliPHOS() : AliDetector()
{
fQATask = 0;
fTreeQA = 0;
fDebug = 0;
+
}
//____________________________________________________________________________
fQATask = 0 ;
fTreeQA = 0 ;
fDebug = 0 ;
- fTimeMax = 1.28E-5 ;
- fTimePeak = 2.0E-6 ;
- fTimeRes = 1.5E-6 ;
- fHighGainFactor = 40;
- fHighGainOffset = 0x200 ;
+ fHighCharge = 8.2 ; // adjusted for a high gain range of 5.12 GeV (10 bits)
+ fHighGain = 6.64 ;
+ fHighLowGainFactor = 16. ; // adjusted for a low gain range of 82 GeV (10 bits)
+ fLowGainOffset = GetGeometry()->GetNModules() + 1 ;
+ // offset added to the module id to distinguish high and low gain data
}
//____________________________________________________________________________
void AliPHOS::Digits2Raw()
{
// convert digits of the current event to raw data
+
+ AliPHOSLoader * loader = dynamic_cast<AliPHOSLoader*>(fLoader) ;
// get the digits
- AliPHOSGetter * gime = AliPHOSGetter::Instance(AliRunLoader::GetGAliceName()) ;
- if (!gime) {
- Error("Digits2Raw", "PHOS Getter not instantiated") ;
- return ;
- }
- gime->Event(gime->EventNumber(), "D") ;
- TClonesArray* digits = gime->Digits() ;
+ loader->LoadDigits();
+ TClonesArray* digits = loader->Digits() ;
if (!digits) {
Error("Digits2Raw", "no digits found !");
return;
}
+ // get the digitizer
+ loader->LoadDigitizer();
+ AliPHOSDigitizer * digitizer = dynamic_cast<AliPHOSDigitizer *>(loader->Digitizer()) ;
+
// get the geometry
- AliPHOSGeometry* geom = gime->PHOSGeometry();
+ AliPHOSGeometry* geom = GetGeometry();
if (!geom) {
Error("Digits2Raw", "no geometry found !");
return;
// some digitization constants
const Int_t kDDLOffset = 0x600; // assigned to PHOS
- const Int_t kThreshold = 3; // skip digits below this threshold
+ const Int_t kThreshold = 1; // skip digits below this threshold
AliAltroBuffer* buffer = NULL;
Int_t prevDDL = -1;
// loop over digits (assume ordered digits)
for (Int_t iDigit = 0; iDigit < digits->GetEntries(); iDigit++) {
- AliPHOSDigit* digit = gime->Digit(iDigit);
+ AliPHOSDigit* digit = dynamic_cast<AliPHOSDigit *>(digits->At(iDigit)) ;
if (digit->GetAmp() < kThreshold)
continue;
Int_t relId[4];
}
// out of time range signal (?)
- if (digit->GetTimeR() > fTimeMax) {
+ if (digit->GetTimeR() > GetRawFormatTimeMax() ) {
buffer->FillBuffer(digit->GetAmp());
- buffer->FillBuffer(fkTimeBins); // time bin
- buffer->FillBuffer(3); // bunch length
+ buffer->FillBuffer(GetRawFormatTimeBins() ); // time bin
+ buffer->FillBuffer(3); // bunch length
buffer->WriteTrailer(3, relId[3], relId[2], module); // trailer
- // simulate linear rise and gaussian decay of signal
+ // calculate the time response function
} else {
- Bool_t highGain = RawSampledResponse(digit->GetTimeR(), digit->GetAmp(), adcValuesHigh, adcValuesLow) ;
-
+ Double_t energy = 0 ;
+ if ( digit->GetId() <= geom->GetNModules() * geom->GetNCristalsInModule())
+ energy = digit->GetAmp() * digitizer->GetEMCchannel() + digitizer->GetEMCpedestal() ;
+ else
+ energy = digit->GetAmp() * digitizer->GetCPVchannel() + digitizer->GetCPVpedestal() ;
+
+ RawSampledResponse(digit->GetTimeR(), energy, adcValuesHigh, adcValuesLow) ;
- // write low and eventually high gain channel
buffer->WriteChannel(relId[3], relId[2], module,
- fkTimeBins, adcValuesLow, kThreshold);
- if (highGain) {
- buffer->WriteChannel(relId[3], relId[2], module + fHighGainOffset,
- fkTimeBins, adcValuesHigh, 1);
- }
+ GetRawFormatTimeBins(), adcValuesHigh, kThreshold);
+ buffer->WriteChannel(relId[3], relId[2], module + fLowGainOffset,
+ GetRawFormatTimeBins(), adcValuesLow, kThreshold);
}
}
delete buffer;
}
- gime->PhosLoader()->UnloadDigits();
+ loader->UnloadDigits();
}
//____________________________________________________________________________
}
//__________________________________________________________________
-Double_t AliPHOS::RawResponseFunction(Double_t *x, Double_t *par)
+Double_t AliPHOS::RawResponseFunction(Double_t *x, Double_t *par)
{
// Shape of the electronics raw reponse:
- // 1. the signal rises linearly from par[4] to par[1] to reach the maximu par[3]
- // 2. the signal decays with a gaussian shape for par[4]+par[1] with a sigma of par[2]
-
- Float_t xx = x[0] ;
-
- Double_t signal = 0. ;
+ // It is a semi-gaussian, 2nd order Gamma function of the general form
+ // v(t) = n**n * Q * A**n / C *(t/tp)**n * exp(-n * t/tp) with
+ // tp : peaking time par[0]
+ // n : order of the function
+ // C : integrating capacitor in the preamplifier
+ // A : open loop gain of the preamplifier
+ // Q : the total APD charge to be measured Q = C * energy
- if (xx < par[4] + par[1]) // signal is rising
- signal = (gRandom->Rndm() + par[3]) * (xx - par[4]) / (par[1] - par[4]) ;
- else // signal is decaying
- signal = (gRandom->Rndm() + par[3]) * TMath::Gaus(xx, par[4] + par[1], par[2]) ;
-
- return signal < 0. ? 0. : signal ;
+ Double_t signal ;
+ Double_t xx = x[0] - ( fgTimeTrigger + par[3] ) ;
+
+ if (xx < 0 || xx > fgTimeMax)
+ signal = 0. ;
+ else {
+ Double_t fac = par[0] * TMath::Power(fgOrder, fgOrder) * TMath::Power(par[1], fgOrder) / fgCapa ;
+ signal = fac * par[2] * TMath::Power(xx / fgTimePeak, fgOrder) * TMath::Exp(-fgOrder * (xx / fgTimePeak)) ;
+ }
+ return signal ;
+}
+
+//__________________________________________________________________
+Double_t AliPHOS::RawResponseFunctionMax(Double_t charge, Double_t gain)
+{
+ return ( charge * TMath::Power(fgOrder, fgOrder) * TMath::Power(gain, fgOrder)
+ / ( fgCapa * TMath::Exp(fgOrder) ) );
+
}
//__________________________________________________________________
-Bool_t AliPHOS::RawSampledResponse(const Float_t dtime, const Int_t damp, Int_t * adcH, Int_t * adcL) const
+Bool_t AliPHOS::RawSampledResponse(const Double_t dtime, const Double_t damp, Int_t * adcH, Int_t * adcL) const
{
// for a start time dtime and an amplitude damp given by digit,
- // calculates the raw sampled response
+ // calculates the raw sampled response AliPHOS::RawResponseFunction
const Int_t kRawSignalOverflow = 0x3FF ;
- Bool_t highGain = kFALSE ;
-
- TF1 f1("signal", RawResponseFunction, 0, fkTimeBins, 5);
-
- f1.SetParNames("Time Max", "Peaking time", "Decay width", "Amp max", "Start time") ;
- f1.SetParameter(0, fTimeMax) ;
- f1.SetParameter(1, fTimePeak) ;
- f1.SetParameter(2, fTimeRes) ;
- f1.SetParameter(3, damp) ;
- f1.SetParameter(4, dtime) ;
-
- for (Int_t iTime = 0; iTime < fkTimeBins; iTime++) {
- Double_t time = iTime * fTimeMax/fkTimeBins;
- Double_t signal = f1.Eval(time) ;
- adcL[iTime] = static_cast<Int_t>(signal + 0.5) ;
- if ( adcL[iTime] > kRawSignalOverflow) // larger than 10 bits
- adcL[iTime] = kRawSignalOverflow ;
- adcH[iTime] = static_cast<Int_t>(0.5 + (signal / fHighGainFactor)) ;
- if (adcH[iTime] > 0)
- highGain = kTRUE;
+ Bool_t lowGain = kFALSE ;
+
+ TF1 signalF("signal", RawResponseFunction, 0, GetRawFormatTimeMax(), 4);
+
+ for (Int_t iTime = 0; iTime < GetRawFormatTimeBins(); iTime++) {
+ signalF.SetParameter(0, GetRawFormatHighCharge() ) ;
+ signalF.SetParameter(1, GetRawFormatHighGain() ) ;
+ signalF.SetParameter(2, damp) ;
+ signalF.SetParameter(3, dtime) ;
+ Double_t time = iTime * GetRawFormatTimeMax() / GetRawFormatTimeBins() ;
+ Double_t signal = signalF.Eval(time) ;
+ if ( static_cast<Int_t>(signal+0.5) > kRawSignalOverflow ){ // larger than 10 bits
+ signal = kRawSignalOverflow ;
+ lowGain = kTRUE ;
+ }
+ adcH[iTime] = static_cast<Int_t>(signal + 0.5) ;
+
+ signalF.SetParameter(0, GetRawFormatLowCharge() ) ;
+ signalF.SetParameter(1, GetRawFormatLowGain() ) ;
+ signal = signalF.Eval(time) ;
+ if ( static_cast<Int_t>(signal+0.5) > kRawSignalOverflow) // larger than 10 bits
+ signal = kRawSignalOverflow ;
+ adcL[iTime] = static_cast<Int_t>(0.5 + signal ) ;
+
}
- return highGain ;
+ return lowGain ;
}
//____________________________________________________________________________
{return AliPHOSGeometry::GetInstance(GetTitle(),"") ; }
virtual void Hits2SDigits();
virtual Int_t IsVersion(void) const = 0 ;
- Int_t GetRawFormatHighGainFactor() const { return fHighGainFactor ; }
- Int_t GetRawFormatHighGainOffset() const { return fHighGainOffset ; }
+ // Raw Read Out
+ Double_t GetRawFormatCapa() const { return fgCapa ; }
+ Double_t GetRawFormatHighCharge() const { return fHighCharge ; }
+ Double_t GetRawFormatHighGain() const { return fHighGain ; }
+ Double_t GetRawFormatHighLowGainFactor() const { return fHighLowGainFactor ; }
+ Double_t GetRawFormatLowCharge() const { return ( fHighCharge * fHighLowGainFactor ) ; }
+ Double_t GetRawFormatLowGain() const { return ( fHighGain / fHighLowGainFactor ) ; }
+ Int_t GetRawFormatLowGainOffset() const { return fLowGainOffset ; }
+ Int_t GetRawFormatOrder() const { return fgOrder ; }
Int_t GetRawFormatTimeBins() const { return fkTimeBins ; }
- Double_t GetRawFormatTimeMax() const { return fTimeMax ; }
- Double_t GetRawFormatTimePeak() const { return fTimePeak ; }
- Double_t GetRawFormatTimeRes() const { return fTimeRes ; }
+ Double_t GetRawFormatTimeMax() const { return fgTimeMax ; }
+ Double_t GetRawFormatTimePeak() const { return fgTimePeak ; }
+ Double_t GetRawFormatTimeTrigger() const { return fgTimeTrigger ; }
+ static Double_t RawResponseFunction(Double_t *x, Double_t *par) ;
+ static Double_t RawResponseFunctionMax(Double_t charge, Double_t gain) ;
+ //
virtual AliLoader* MakeLoader(const char* topfoldername);
AliPHOSQAChecker * QAChecker() {return fQATask;}
- static Double_t RawResponseFunction(Double_t *x, Double_t *par) ;
virtual void SetTreeAddress();
virtual TTree * TreeQA() const {return fTreeQA; }
virtual const TString Version() const {return TString(" ") ; }
protected:
- Bool_t RawSampledResponse(const Float_t dtime, const Int_t damp, Int_t * adcH, Int_t * adcL) const ;
+ Bool_t RawSampledResponse(const Double_t dtime, const Double_t damp, Int_t * adcH, Int_t * adcL) const ;
- AliPHOSQAChecker * fQATask ; //! PHOS checkers container
- TTree * fTreeQA ; // the QA tree that contains the alarms
- Int_t fHighGainFactor ; // High gain attenuation factor of the raw RO signal
- Int_t fHighGainOffset ; // offset added to the module id to distinguish high and low gain data
- static const Int_t fkTimeBins = 256 ; // number of sampling bins of the raw RO signal
- Double_t fTimeMax ; // maximum sampled time of the raw RO signal
- Double_t fTimePeak ; // peaking time of the raw RO signal
- Double_t fTimeRes ; // decay rime width of the raw RO signal
-
- ClassDef(AliPHOS,3) // Photon Spectrometer Detector (base class)
-
+ AliPHOSQAChecker * fQATask ; //! PHOS checkers container
+ TTree * fTreeQA ; // the QA tree that contains the alarms
+ static Double_t fgCapa ; // capacitor of the preamplifier for the raw RO signal
+ Double_t fHighCharge ; // high charge (to convert energy to charge) for the raw RO signal
+ Double_t fHighGain ; // high gain for the raw RO signal
+ Double_t fHighLowGainFactor ; // high to low gain factor for the raw RO signal
+ Int_t fLowGainOffset ; // to separate high from low gain in the DDL
+ static Int_t fgOrder ; // order of the gamma function for the RO signal
+ static const Int_t fkTimeBins = 256 ; // number of sampling bins of the raw RO signal
+ static Double_t fgTimeMax ; // maximum sampled time of the raw RO signal
+ static Double_t fgTimePeak ; // peaking time of the raw RO signal
+ static Double_t fgTimeTrigger ; // time of the trigger for the RO signal
+
+ ClassDef(AliPHOS,4) // Photon Spectrometer Detector (base class)
} ;
#endif // ALIPHOS_H
#include <TParticle.h>
#include <TH1D.h>
#include <TF1.h>
+#include <TGraph.h>
// --- Standard library ---
#include "AliStack.h"
#include "AliPHOSRawStream.h"
#include "AliRawReaderFile.h"
+#include "AliLog.h"
ClassImp(AliPHOSGetter)
return rv ;
}
+
+//____________________________________________________________________________
+void AliPHOSGetter::FitRaw(Bool_t lowGainFlag, TGraph * gLowGain, TGraph * gHighGain, TF1* signalF, Int_t & amp, Double_t & time)
+{
+ // Fits the raw signal time distribution
+
+ const Int_t kNoiseThreshold = 0 ;
+ Double_t timezero1 = 0., timezero2 = 0., timemax = 0. ;
+ Double_t signal = 0., signalmax = 0. ;
+ Double_t energy = time = 0. ;
+
+ if (lowGainFlag) {
+ Int_t index ;
+ for (index = 0; index < PHOS()->GetRawFormatTimeBins(); index++) {
+ gLowGain->GetPoint(index, time, signal) ;
+ if (signal > kNoiseThreshold && timezero1 == 0.)
+ timezero1 = time ;
+ if (signal <= kNoiseThreshold && timezero1 > 0. && timezero2 == 0.)
+ timezero2 = time ;
+ if (signal > signalmax) {
+ signalmax = signal ;
+ timemax = time ;
+ }
+ }
+ signalmax /= PHOS()->RawResponseFunctionMax(PHOS()->GetRawFormatLowCharge(),
+ PHOS()->GetRawFormatLowGain()) ;
+ if ( timezero1 + PHOS()->GetRawFormatTimePeak() < PHOS()->GetRawFormatTimeMax() * 0.4 ) { // else its noise
+ signalF->SetParameter(2, signalmax) ;
+ signalF->SetParameter(3, timezero1) ;
+ gLowGain->Fit(signalF, "QRON", "", 0., timezero2); //, "QRON") ;
+ energy = signalF->GetParameter(2) ;
+ time = signalF->GetMaximumX() - PHOS()->GetRawFormatTimePeak() - PHOS()->GetRawFormatTimeTrigger() ;
+ }
+ } else {
+ timezero1 = timezero2 = signalmax = timemax = 0. ;
+ signalF->FixParameter(0, PHOS()->GetRawFormatHighCharge()) ;
+ signalF->FixParameter(1, PHOS()->GetRawFormatHighGain()) ;
+ Int_t index ;
+ for (index = 0; index < PHOS()->GetRawFormatTimeBins(); index++) {
+ gHighGain->GetPoint(index, time, signal) ;
+ if (signal > kNoiseThreshold && timezero1 == 0.)
+ timezero1 = time ;
+ if (signal <= kNoiseThreshold && timezero1 > 0. && timezero2 == 0.)
+ timezero2 = time ;
+ if (signal > signalmax) {
+ signalmax = signal ;
+ timemax = time ;
+ }
+ }
+ signalmax /= PHOS()->RawResponseFunctionMax(PHOS()->GetRawFormatHighCharge(),
+ PHOS()->GetRawFormatHighGain()) ;;
+ if ( timezero1 + PHOS()->GetRawFormatTimePeak() < PHOS()->GetRawFormatTimeMax() * 0.4 ) { // else its noise
+ signalF->SetParameter(2, signalmax) ;
+ signalF->SetParameter(3, timezero1) ;
+ gHighGain->Fit(signalF, "QRON", "", 0., timezero2) ;
+ energy = signalF->GetParameter(2) ;
+ time = signalF->GetMaximumX() - PHOS()->GetRawFormatTimePeak() - PHOS()->GetRawFormatTimeTrigger() ;
+ }
+ }
+
+ if (time == 0. && energy == 0.)
+ amp = 0 ;
+ else {
+ AliPHOSDigitizer * digitizer = Digitizer() ;
+ amp = static_cast<Int_t>( (energy - digitizer->GetEMCpedestal()) / digitizer->GetEMCchannel() + 0.5 ) ;
+ }
+}
+
//____________________________________________________________________________
Int_t AliPHOSGetter::ReadRaw(Int_t event)
{
AliRawReaderFile rawReader(event) ;
AliPHOSRawStream in(&rawReader);
-
- const Int_t kHighGainIdOffset = PHOSGeometry()->GetNModules()
- * PHOSGeometry()->GetNPhi()
- * PHOSGeometry()->GetNZ()
- * 2 ;
Bool_t first = kTRUE ;
- TH1D hLowGain("hLowGain", "Low Gain", 1000, 0., PHOS()->GetRawFormatTimeMax()) ;
- TH1D hHighGain("hHighGain", "High Gain", 1000, 0., PHOS()->GetRawFormatTimeMax()) ;
-
- // fit half the gaussian decay rather than AliPHOS::RawResponseFunction because thiswould give a floating point
- // exception during error calculation ... To solve...
- TF1 * gauss = new TF1("gauss", "gaus",
- PHOS()->GetRawFormatTimePeak(),
- PHOS()->GetRawFormatTimeMax() ) ;
+ TGraph * gLowGain = new TGraph(PHOS()->GetRawFormatTimeBins()) ;
+ TGraph * gHighGain = new TGraph(PHOS()->GetRawFormatTimeBins()) ;
+
+ TF1 * signalF = new TF1("signal", AliPHOS::RawResponseFunction, 0, PHOS()->GetRawFormatTimeMax(), 4);
+ signalF->SetParNames("Charge", "Gain", "Amplitude", "TimeZero") ;
Int_t relId[4], id ;
- Bool_t hgflag = kFALSE ;
+ Bool_t lowGainFlag = kFALSE ;
TClonesArray * digits = Digits() ;
digits->Clear() ;
Int_t idigit = 0 ;
+ Int_t amp = 0 ;
+ Double_t time = 0. ;
while ( in.Next() ) { // PHOS entries loop
-
if ( (in.IsNewRow() || in.IsNewColumn() || in.IsNewModule()) ) {
if (!first) {
- hLowGain.Fit(gauss, "QRON") ;
- Int_t ampL = static_cast<Int_t>(gauss->Eval(gauss->GetParameter(2)) + 0.5) ;
- Double_t timeL = PHOS()->GetRawFormatTimePeak() - gauss->GetParameter(2) ;
- if (timeL < 0 ) // happens with noise
- timeL = PHOS()->GetRawFormatTimePeak() ;
- if (hgflag) {
- hHighGain.Fit(gauss, "QRON") ;
- Int_t ampH = static_cast<Int_t>(gauss->Eval(gauss->GetParameter(2)) + 0.5) ;
- Double_t timeH = PHOS()->GetRawFormatTimePeak() - gauss->GetParameter(2) ;
- if (timeH < 0 ) // happens with noise
- timeH = PHOS()->GetRawFormatTimePeak() ;
- new((*digits)[idigit]) AliPHOSDigit( -1, id+kHighGainIdOffset, ampH, timeH) ;
- idigit++ ;
- }
- else {
- new((*digits)[idigit]) AliPHOSDigit( -1, id, ampL, timeL) ;
+
+ FitRaw(lowGainFlag, gLowGain, gHighGain, signalF, amp, time) ;
+ if (amp > 0) {
+ new((*digits)[idigit]) AliPHOSDigit( -1, id, amp, time) ;
idigit++ ;
}
}
first = kFALSE ;
- hLowGain.Reset() ;
- hHighGain.Reset() ;
relId[0] = in.GetModule() ;
- if ( relId[0] >= PHOS()->GetRawFormatHighGainOffset() ) {
- relId[0] -= PHOS()->GetRawFormatHighGainOffset() ;
- hgflag = kTRUE ;
+ if ( relId[0] >= PHOS()->GetRawFormatLowGainOffset() ) {
+ relId[0] -= PHOS()->GetRawFormatLowGainOffset() ;
+ lowGainFlag = kTRUE ;
} else
- hgflag = kFALSE ;
+ lowGainFlag = kFALSE ;
relId[1] = 0 ;
relId[2] = in.GetRow() ;
relId[3] = in.GetColumn() ;
PHOSGeometry()->RelToAbsNumbering(relId, id) ;
}
- if (hgflag)
- hHighGain.Fill(
- in.GetTime() * PHOS()->GetRawFormatTimeMax() / PHOS()->GetRawFormatTimeBins(),
- in. GetSignal() * PHOS()->GetRawFormatHighGainFactor() ) ;
+ if (lowGainFlag)
+ gLowGain->SetPoint(in.GetTime(),
+ in.GetTime(),
+ in.GetSignal()) ;
else
- hLowGain.Fill(
- in.GetTime() * PHOS()->GetRawFormatTimeMax() / PHOS()->GetRawFormatTimeBins(),
- in. GetSignal() ) ;
+ gHighGain->SetPoint(in.GetTime(),
+ in.GetTime() * PHOS()->GetRawFormatTimeMax() / PHOS()->GetRawFormatTimeBins(),
+ in.GetSignal() ) ;
+
} // PHOS entries loop
+
+ FitRaw(lowGainFlag, gLowGain, gHighGain, signalF, amp, time) ;
+ if (amp > 0 ) {
+ new((*digits)[idigit]) AliPHOSDigit( -1, id, amp, time) ;
+ idigit++ ;
+ }
+
+ delete signalF ;
+ delete gLowGain, gHighGain ;
- delete gauss ;
-
- return Digits()->GetEntriesFast() ;
+ return digits->GetEntriesFast() ;
}
//____________________________________________________________________________
#include "TObject.h"
class TParticle ;
class TTree ;
+class TGraph ;
+class TF1 ;
// --- Standard library ---
Int_t ReadTreeE(Int_t event) ;
Bool_t OpenESDFile() ;
void ReadPrimaries(void) ;
-
+
+ void FitRaw(Bool_t lowGainFlag, TGraph * gLowGain, TGraph * gHighGain, TF1* signalF, Int_t & amp, Double_t & time) ;
+
private:
AliPHOSBeamTestEvent * fBTE ; //! Header if BeamTest Event
git://git.uio.no / u / mrichter / AliRoot.git / commitdiff