// A Summable Digits is the sum of all hits originating
// from one in one tower of the EMCAL
// A threshold for assignment of the primary to SDigit is applied
+//
+// JLK 26-Jun-2008 Added explanation:
+// SDigits need to hold the energy sum of the hits, but AliEMCALDigit
+// can (should) only store amplitude. Therefore, the SDigit energy is
+// "digitized" before being stored and must be "calibrated" back to an
+// energy before SDigits are summed to form true Digits
+//
// SDigits are written to TreeS, branch "EMCAL"
// AliEMCALSDigitizer with all current parameters is written
// to TreeS branch "AliEMCALSDigitizer".
// --- ROOT system ---
#include <TBenchmark.h>
-#include <TH1.h>
#include <TBrowser.h>
#include <Riostream.h>
#include <TMath.h>
#include "AliEMCALHit.h"
#include "AliEMCALSDigitizer.h"
#include "AliEMCALGeometry.h"
-//JLK
-//#include "AliEMCALHistoUtilities.h"
ClassImp(AliEMCALSDigitizer)
fFirstEvent(0),
fLastEvent(0),
fSampling(0.)
- //JLK
- //fControlHists(0),
- //fHists(0)
{
// ctor
InitParameters();
fFirstEvent(0),
fLastEvent(0),
fSampling(0.)
- //JLK
- //fControlHists(1),
- //fHists(0)
{
// ctor
Init();
InitParameters() ;
- //JLK
- //if(fControlHists) BookControlHists(1);
}
fFirstEvent(sd.fFirstEvent),
fLastEvent(sd.fLastEvent),
fSampling(sd.fSampling)
- //JLK
- //fControlHists(sd.fControlHists),
- //fHists(sd.fHists)
{
//cpy ctor
}
if (geom->GetSampling() == 0.) {
Fatal("InitParameters", "Sampling factor not set !") ;
}
+
+ //
+ //JLK 26-Jun-2008 THIS SHOULD HAVE BEEN EXPLAINED AGES AGO:
+ //
+ //In order to be able to store SDigit Energy info into
+ //AliEMCALDigit, we need to convert it temporarily to an ADC amplitude
+ //and later when summing SDigits to form digits, convert it back to
+ //energy. These fA and fB parameters accomplish this through the
+ //Digitize() and Calibrate() methods
+ //
// Initializes parameters
fA = 0;
fB = 1.e+6; // Changed 24 Apr 2007. Dynamic range now 2 TeV
AliDebug(2,Form(" Sampling = %f\n", fSampling));
AliDebug(2,Form("---------------------------------------------------\n"));
- // Print("");
}
AliDebug(2,Form(" Sampling = %f\n", fSampling));
AliDebug(2,Form("---------------------------------------------------\n"));
- // Print();
return ;
}
nSdigits = sdigits->GetEntriesFast() ;
fSDigitsInRun += nSdigits ;
-
- //JLK
- //Double_t e=0.,esum=0.;
- //AliEMCALHistoUtilities::FillH1(fHists, 0, double(sdigits->GetEntriesFast()));
+
for (i = 0 ; i < sdigits->GetEntriesFast() ; i++) {
AliEMCALDigit * sdigit = dynamic_cast<AliEMCALDigit *>(sdigits->At(i)) ;
sdigit->SetIndexInList(i) ;
-
- //JLK
- //AliEMCALHistoUtilities::FillH1(fHists, 2, double(sdigit->GetAmp()));
- //e = double(Calibrate(sdigit->GetAmp()));
- //esum += e;
- //AliEMCALHistoUtilities::FillH1(fHists, 3, e);
- //AliEMCALHistoUtilities::FillH1(fHists, 4, double(sdigit->GetId()));
}
- //JLK
- //if(esum>0.) AliEMCALHistoUtilities::FillH1(fHists, 1, esum);
// Now write SDigits
//__________________________________________________________________
Int_t AliEMCALSDigitizer::Digitize(Float_t energy)const {
// Digitize the energy
- Double_t aSignal = fA + energy*fB;
- if (TMath::Abs(aSignal)>2147483647.0) {
- //PH 2147483647 is the max. integer
- //PH This apparently is a problem which needs investigation
- AliWarning(Form("Too big or too small energy %f",aSignal));
- aSignal = TMath::Sign((Double_t)2147483647,aSignal);
- }
- return (Int_t ) aSignal;
+ //
+ //JLK 26-Jun-2008 EXPLANATION LONG OVERDUE:
+ //
+ //We have to digitize the SDigit energy so that it can be stored in
+ //AliEMCALDigit, which has only an ADC amplitude member and
+ //(rightly) no energy member. This method converts the energy to an
+ //integer which can be re-converted back to an energy with the
+ //Calibrate(energy) method when it is time to create Digits from SDigits
+ //
+ Double_t aSignal = fA + energy*fB;
+ if (TMath::Abs(aSignal)>2147483647.0) {
+ //PH 2147483647 is the max. integer
+ //PH This apparently is a problem which needs investigation
+ AliWarning(Form("Too big or too small energy %f",aSignal));
+ aSignal = TMath::Sign((Double_t)2147483647,aSignal);
}
-
+ return (Int_t ) aSignal;
+}
//__________________________________________________________________
+Float_t AliEMCALSDigitizer::Calibrate(Int_t amp)const {
+ //
+ // Convert the amplitude back to energy in GeV
+ //
+ //JLK 26-Jun-2008 EXPLANATION LONG OVERDUE:
+ //
+ //We have to digitize the SDigit energy with the method Digitize()
+ //so that it can be stored in AliEMCALDigit, which has only an ADC
+ //amplitude member and (rightly) no energy member. This method is
+ //just the reverse of Digitize(): it converts the stored amplitude
+ //back to an energy value in GeV so that the SDigit energies can be
+ //summed before adding noise and creating digits out of them
+ //
+ return (Float_t)(amp - fA)/fB;
+
+}
+
+//__________________________________________________________________
void AliEMCALSDigitizer::Print1(Option_t * option)
{
Print();
}
}
delete tempo ;
- printf("\n** Sum %i : %10.3f GeV/c **\n ", isum, double(isum)*1.e-6);
+ printf("\n** Sum %i : %10.3f GeV/c **\n ", isum, Calibrate(isum));
} else printf("\n");
}
//____________________________________________________________________________
void AliEMCALSDigitizer::Browse(TBrowser* b)
{
- //JLK
- //if(fHists) b->Add(fHists);
TTask::Browse(b);
}
-
-/*
-//____________________________________________________________________________
-TList *AliEMCALSDigitizer::BookControlHists(int var)
-{
- //book histograms for monitoring sdigitization
- // 22-nov-04
- gROOT->cd();
- const AliEMCALGeometry *geom = AliEMCALGeometry::GetInstance() ;
- if(var>=1){
- AliDebug(1, " BookControlHists() in action ");
- new TH1F("HSDigiN", "#EMCAL sdigits ", 1001, -0.5, 1000.5);
- new TH1F("HSDigiSumEnergy","Sum.EMCAL energy", 1000, 0.0, 100.);
- new TH1F("HSDigiAmp", "EMCAL sdigits amplitude", 1000, 0., 2.e+9);
- new TH1F("HSDigiEnergy","EMCAL cell energy", 1000, 0.0, 100.);
- new TH1F("HSDigiAbsId","EMCAL absID for sdigits",
- geom->GetNCells(), 0.5, Double_t(geom->GetNCells())+0.5);
- }
-
- fHists = AliEMCALHistoUtilities::MoveHistsToList("EmcalSDigiControlHists", kFALSE);
- // fHists = 0; ??
-
- return fHists;
-}
-
-//____________________________________________________________________________
-void AliEMCALSDigitizer::SaveHists(const char* name, Bool_t kSingleKey, const char* opt)
-{
- AliEMCALHistoUtilities::SaveListOfHists(fHists, name, kSingleKey, opt);
-}
-*/
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff