* provided "as is" without express or implied warranty. *
**************************************************************************/
-//_________________________________________________________________________
-// This is a class that constructs ReconstParticles (reconstructed particles)
-// out of Digits
+//____________________________________________________________________
+// This is a class that constructs ReconstParticles (reconstructed
+// particles) out of Digits
+//
+//
+// This class reads either digits from a TClonesArray or raw data from
+// a DDL file (or similar), and stores the read ADC counts in an
+// internal cache (fAdcs).
+//
+// From the cached values it then calculates the number of particles
+// that hit a region of the FMDs, as specified by the user.
+//
+// The reconstruction can be done in two ways: Either via counting the
+// number of empty strips (Poisson method), or by converting the ADC
+// signal to an energy deposition, and then dividing by the typical
+// energy loss of a particle.
+//
+// Currently, this class only reads the digits from a TClonesArray,
+// and the Poission method for reconstruction.
+//
//
//-- Authors: Evgeny Karpechev(INR) and Alla Maevsksia
-//////////////////////////////////////////////////////////////////////////////
+// Latest changes by Christian Holm Christensen <cholm@nbi.dk>
+//
+//
+//____________________________________________________________________
-// --- ROOT system ---
-#include "TTask.h"
-#include "TTree.h"
-#include "TSystem.h"
-#include "TFile.h"
-#include "TROOT.h"
-#include "TFolder.h"
-#include "TH2F.h"
-#include "TRandom.h"
+#ifndef ALIFMD_H
+# include "AliFMD.h"
+#endif
+#ifndef ALIFMDDIGIT_H
+# include "AliFMDDigit.h"
+#endif
+#ifndef ALIFMDPARTICLES_H
+# include "AliFMDParticles.h"
+#endif
+#ifndef ALIFMDRECONSTRUCTOR_H
+# include "AliFMDReconstructor.h"
+#endif
+#ifndef ALIALTROBUFFER_H
+# include "AliAltroBuffer.h"
+#endif
+#ifndef ALILOG_H
+# include "AliLog.h"
+#endif
+#ifndef ALIRUN_H
+# include "AliRun.h"
+#endif
+#ifndef ALIRUNLOADER_H
+# include "AliRunLoader.h"
+#endif
+#ifndef ALILOADER_H
+# include "AliLoader.h"
+#endif
+#ifndef ALIHEADER_H
+# include "AliHeader.h"
+#endif
+#ifndef ALIGENEVENTHEADER_H
+# include "AliGenEventHeader.h"
+#endif
+#ifndef ALIRAWREADERFILE_H
+# include "AliRawReaderFile.h"
+#endif
+#ifndef ALIFMDRAWSTREAM_H
+# include "AliFMDRawStream.h"
+#endif
+
+//____________________________________________________________________
+ClassImp(AliFMDReconstructor);
-// --- Standard library ---
-#include <stdlib.h>
-#include <Riostream.h>
+//____________________________________________________________________
+AliFMDReconstructor::AliFMDReconstructor()
+ : AliReconstructor(),
+ fAdcs(kMaxDetectors, kMaxRings, kMaxSectors, kMaxStrips),
+ fDeltaEta(0),
+ fDeltaPhi(0),
+ fThreshold(0),
+ fPedestal(0),
+ fPedestalWidth(0)
+{
+ SetDeltaEta();
+ SetDeltaPhi();
+ SetThreshold();
+ SetPedestal();
+
+ fParticles = new TClonesArray("AliFMDParticles", 1000);
+ fFMDLoader = 0;
+ fRunLoader = 0;
+ fFMD = 0;
+}
+
+//____________________________________________________________________
+void
+AliFMDReconstructor::SetPedestal(Float_t mean, Float_t width)
+{
+ // Set the pedestal, and pedestal width
+ fPedestal = mean;
+ fPedestalWidth = width;
+}
+
+//____________________________________________________________________
+void
+AliFMDReconstructor::Reconstruct(AliRunLoader* runLoader,
+ AliRawReader* rawReader) const
+{
+ // Collects all digits in the same active volume into number of
+ // particles
+ //
+ // Reconstruct number of particles in given group of pads for given
+ // FMDvolume determined by numberOfVolume,
+ // numberOfMinSector, numberOfMaxSector, numberOfMinRing,
+ // numberOgMaxRing
+ //
+ // The reconstruction method is choosen based on the number of empty
+ // strips.
+ fParticles->Clear();
+ if (!runLoader) {
+ Error("Exec","Run Loader loader is NULL - Session not opened");
+ return;
+ }
+ fRunLoader = runLoader;
+ fFMDLoader = runLoader->GetLoader("FMDLoader");
+ if (!fFMDLoader)
+ Fatal("AliFMDReconstructor","Can not find FMD (loader) "
+ "in specified event");
-// --- AliRoot header files ---
+ // Get the AliRun object
+ if (!fRunLoader->GetAliRun()) fRunLoader->LoadgAlice();
+
+ // Get the AliFMD object
+ fFMD = static_cast<AliFMD*>(fRunLoader->GetAliRun()->GetDetector("FMD"));
+ if (!fFMD) {
+ AliError("Can not get FMD from gAlice");
+ return;
+ }
+ fFMDLoader->LoadRecPoints("RECREATE");
-#include "AliRunLoader.h"
-#include "AliLoader.h"
+ if (!fRunLoader->TreeE()) fRunLoader->LoadHeader();
-#include "AliFMDdigit.h"
-#include "AliFMDReconstParticles.h"
-#include "AliFMDReconstructor.h"
-#include "AliRun.h"
-#include "AliConfig.h"
-#include "AliHeader.h"
-#include "AliGenEventHeader.h"
+ TClonesArray* digits = fFMD->Digits();
+ if (rawReader) {
+ Int_t event = 0;
+ while (rawReader->NextEvent()) {
+ ProcessEvent(event, rawReader, digits);
+ event++;
+ }
+ }
+ else {
+ Int_t nEvents= Int_t(fRunLoader->TreeE()->GetEntries());
+ for(Int_t event = 0; event < nEvents; event++)
+ ProcessEvent(event, 0, digits);
+ }
-ClassImp(AliFMDReconstructor)
-
-//____________________________________________________________________________
+ fFMDLoader->UnloadRecPoints();
+ fFMDLoader = 0;
+ fRunLoader = 0;
+ fFMD = 0;
+}
-void AliFMDReconstructor::Reconstruct(AliRunLoader* runLoader) const
+//____________________________________________________________________
+void
+AliFMDReconstructor::Reconstruct(AliRunLoader* runLoader) const
{
- //Collects all digits in the same active volume into number of particles
- /*
- Reconstruct number of particles
- in given group of pads for given FMDvolume
- determine by numberOfVolume ,
- numberOfMinSector,numberOfMaxSector,
- numberOfMinRing, numberOgMaxRing
- Reconstructor method choose dependence on number of empty pads
- */
-
-
-#ifdef DEBUG
- Info("Exec ","Start");
-#endif
+ // Collects all digits in the same active volume into number of
+ // particles
+ //
+ // Reconstruct number of particles in given group of pads for given
+ // FMDvolume determined by numberOfVolume,
+ // numberOfMinSector, numberOfMaxSector, numberOfMinRing,
+ // numberOgMaxRing
+ //
+ // The reconstruction method is choosen based on the number of empty
+ // strips.
+ Reconstruct(runLoader, 0);
+}
+
+
+//____________________________________________________________________
+void
+AliFMDReconstructor::ProcessEvent(Int_t event,
+ AliRawReader* reader,
+ TClonesArray* digits) const
+{
+ fRunLoader->GetEvent(event) ;
+ //event z-vertex for correction eta-rad dependence
+ AliHeader *header = fRunLoader->GetHeader();
+ if (!header)
+ Warning("ProcessEvent", "no AliHeader found!");
+ AliGenEventHeader* genHeader = (header ? header->GenEventHeader() : 0);
- Int_t const knumVolumes=5;
- Int_t padADC;
- Float_t eta, etain,etaout,rad,theta;
- Int_t ivol, iSector, iRing;
- Float_t rin[5]={4.2,15.4,4.2,15.4,4.2};
- Float_t rout[5]={17.4,28.4,17.4,28.4,17.4};
- Float_t z[5]={-62.8, -75.2, 83.4, 75.2, 340.};
- Int_t numberOfRings[5]={512,256,512,256,512};
- Int_t numberOfSectors[5]= {20,40,20,40,20};
- Int_t numberOfEtaIntervals[5];
- // number of ring for boundary 0.1 eta
+ // Get the Z--coordinate from the event header
+ TArrayF o(3);
+ if (genHeader) genHeader->PrimaryVertex(o);
+ Float_t zVertex = o.At(2);
+ // If the recontruction tree isn't loaded, load it
+ if(fFMDLoader->TreeR()==0) fFMDLoader->MakeTree("R");
- if (runLoader == 0x0)
- {
- Error("Exec","Run Loader loader is NULL - Session not opened");
- return;
- }
-
- AliLoader* plFMD = runLoader->GetLoader("FMDLoader");
- if (plFMD == 0x0)
- {
- Fatal("AliFMDReconstructor","Can not find FMD (loader) in specified event");
- return;//never reached
- }
-
- if (!runLoader->GetAliRun()) runLoader->LoadgAlice();
- if (!runLoader->TreeE()) runLoader->LoadHeader();
-
- TDirectory* cwd = gDirectory;
- gDirectory = 0x0;
- Text_t buf1[20];
- TH2F* hTotal[10];
- for (Int_t j=1; j<=5; j++){
- sprintf(buf1,"hTotal%d",j);
+ //Make branches to hold the reconstructed particles
+ const Int_t kBufferSize = 16000;
+ fFMDLoader->TreeR()->Branch("FMD", &fParticles, kBufferSize);
+
+ // Load or recreate the digits
+ if (fFMDLoader->LoadDigits((reader ? "UPDATE" : "READ"))) {
+ if (!reader) {
+ Error("Exec","Error occured while loading digits. Exiting.");
+ return;
+ }
- hTotal[j] = new TH2F(buf1," Number of primary particles ",
- numberOfSectors[j-1],1,numberOfSectors[j-1],
- numberOfRings[j-1],1,numberOfRings[j-1]);
- }
- gDirectory = cwd;
-
- plFMD->LoadRecPoints("RECREATE");
- TClonesArray* reconParticles = new TClonesArray("AliFMDReconstParticles");
- TClonesArray* digits = new TClonesArray("AliFMDdigit");
-
- Int_t retval=0;
- Int_t nevents=Int_t (runLoader->TreeE()->GetEntries());
-#ifdef DEBUG
- cout<<" nevents "<<nevents<<endl;
-#endif
- for(Int_t ievent=0;ievent<nevents;ievent++)
- {
-#ifdef DEBUG
- cout<<" *** event "<<ievent<<endl;
-#endif
- runLoader->GetEvent(ievent) ;
- //event z-vertex for correction eta-rad dependence
- AliHeader *header = runLoader->GetHeader();
- AliGenEventHeader* genHeader = header->GenEventHeader();
- TArrayF *o = new TArrayF(3);
- if (genHeader) genHeader->PrimaryVertex(*o);
- Float_t zVertex=o->At(2);
-
- for (Int_t i=0; i<5; i++)
- hTotal[i+1]->Reset();
-
- retval = plFMD->LoadDigits("READ");
- if (retval)
- {
- Error("Exec","Error occured while loading digits. Exiting.");
- return;
+ }
+ // Get the digits tree
+ TTree* digitTree = fFMDLoader->TreeD();
+ if (!digitTree) {
+ if (!reader) {
+ Error("Exec","Can not get Tree with Digits. "
+ "Nothing to reconstruct - Exiting");
+ return;
+ }
+ fFMDLoader->MakeTree("D");
+ digitTree = fFMDLoader->TreeD();
+
+ }
+ // Get the FMD branch holding the digits.
+ TBranch *digitBranch = digitTree->GetBranch("FMD");
+ if (!digitBranch) {
+ if (!reader) {
+ Error("Exec", "No digit branch for the FMD found");
+ return;
+ }
+ fFMD->MakeBranchInTree(digitTree, fFMD->GetName(), &(digits), 4000, 0);
+ }
+ if (!reader) digitBranch->SetAddress(&digits);
+
+ fEmptyStrips = 0;
+ fTotalStrips = 0;
+ Bool_t ok = kFALSE;
+ if (reader) ok = ReadAdcs(reader);
+ else if (digits) ok = ReadAdcs(digits);
+ if (!ok) return;
+
+ ReconstructFromCache(zVertex);
+
+ if (reader) {
+ digitTree->Fill();
+ fFMDLoader->WriteDigits("OVERWRITE");
+ }
+ fFMDLoader->UnloadDigits();
+ fFMDLoader->TreeR()->Reset();
+ fFMDLoader->TreeR()->Fill();
+ fFMDLoader->WriteRecPoints("OVERWRITE");
+}
+
+//____________________________________________________________________
+Bool_t
+AliFMDReconstructor::ReadAdcs(TClonesArray* digits) const
+{
+ AliDebug(10, "Reading ADCs from Digits array");
+ // read Digits, and reconstruct the particles
+ if (!fFMDLoader->TreeD()->GetEvent(0)) return kFALSE;
+
+ // Reads the digits from the array, and fills up the cache (fAdcs)
+ fAdcs.Clear();
+ Int_t nDigits = digits->GetEntries();
+ for (Int_t digit = 0; digit < nDigits; digit++) {
+ AliFMDDigit* fmdDigit =
+ static_cast<AliFMDDigit*>(digits->UncheckedAt(digit));
+
+ ProcessDigit(fmdDigit);
+ } //digit loop
+ return kTRUE;
+}
+
+//____________________________________________________________________
+Bool_t
+AliFMDReconstructor::ReadAdcs(AliRawReader* reader) const
+{
+ AliDebug(10, "Reading ADCs from RawReader");
+ // Reads the digits from a RAW data
+ fAdcs.Clear();
+ // reader->Reset();
+
+ if (!reader->ReadHeader()) {
+ Error("ReadAdcs", "Couldn't read header");
+ return kFALSE;
+ }
+
+ // Use AliAltroRawStream to read the ALTRO format. No need to
+ // reinvent the wheel :-)
+ AliFMDRawStream input(reader);
+ // Select FMD DDL's
+ reader->Select(AliFMD::kBaseDDL >> 8);
+
+ Int_t oldDDL = -1;
+ Int_t count = 0;
+ UShort_t detector = 1; // Must be one here
+ UShort_t oldDetector = 0;
+ // Loop over data in file
+ Bool_t next = kTRUE;
+
+ // local Cache
+ TArrayI counts(10);
+ counts.Reset(-1);
+ Int_t offset = 0;
+
+ while (next) {
+ next = input.Next();
+
+
+ count++;
+ Int_t ddl = reader->GetDDLID();
+ if (ddl != oldDDL
+ || input.IsNewStrip()
+ || !next) {
+ // Make a new digit, if we have some data!
+ if (counts[0] >= 0) {
+ // Got a new strip.
+ AliDebug(10, Form("Add a new strip: FMD%d%c[%2d,%3d] "
+ "(current: FMD%d%c[%2d,%3d])",
+ oldDetector, input.PrevRing(),
+ input.PrevSector() , input.PrevStrip(),
+ detector , input.Ring(), input.Sector(),
+ input.Strip()));
+ fFMD->AddDigit(oldDetector,
+ input.PrevRing(),
+ input.PrevSector(),
+ input.PrevStrip(),
+ counts[0], counts[1], counts[2]);
+ AliFMDDigit* digit =
+ static_cast<AliFMDDigit*>(fFMD->Digits()->
+ UncheckedAt(fFMD->GetNdigits()-1));
+ ProcessDigit(digit);
+ }
+
+ if (!next) {
+ AliDebug(10, Form("Read %d channels for FMD%d",
+ count + 1, detector));
+ break;
+ }
+
+
+ // If we got a new DDL, it means we have a new detector.
+ if (ddl != oldDDL) {
+ if (detector != 0)
+ AliDebug(10, Form("Read %d channels for FMD%d",
+ count + 1, detector));
+ // Reset counts, and update the DDL cache
+ count = 0;
+ oldDDL = ddl;
+ // Check that we're processing a FMD detector
+ Int_t detId = reader->GetDetectorID();
+ if (detId != (AliFMD::kBaseDDL >> 8)) {
+ Error("ReadAdcs", "Detector ID %d != %d",
+ detId, (AliFMD::kBaseDDL >> 8));
+ break;
}
-
- TTree* treeD = plFMD->TreeD();
- if (treeD == 0x0)
- {
- Error("Exec","Can not get Tree with Digits. Nothing to reconstruct - Exiting");
- return;
+ // Figure out what detector we're deling with
+ oldDetector = detector;
+ switch (ddl) {
+ case 0: detector = 1; break;
+ case 1: detector = 2; break;
+ case 2: detector = 3; break;
+ default:
+ Error("ReadAdcs", "Unknown DDL 0x%x for FMD", ddl);
+ return kFALSE;
}
-
- TBranch *brDigits=0;
-
- brDigits=treeD->GetBranch("FMD");
-
- if (brDigits) {
- brDigits->SetAddress(&digits);
- }else{
- cerr<<"EXEC Branch FMD digits not found"<<endl;
- return;
- }
-
- if(plFMD->TreeR()==0) plFMD->MakeTree("R");
+ AliDebug(10, Form("Reading ADCs for 0x%x - That is FMD%d",
+ reader->GetEquipmentId(), detector));
+ }
+ counts.Reset(-1);
+ offset = 0;
+ }
+
+ counts[offset] = input.Count();
+ offset++;
+
+ AliDebug(10, Form("ADC of FMD%d%c[%2d,%3d] += %d",
+ detector, input.Ring(), input.Sector(),
+ input.Strip(), input.Count()));
+ oldDetector = detector;
+ }
+ return kTRUE;
+}
- //Make branches
- const Int_t kBufferSize = 16000;
- plFMD->TreeR()->Branch("FMD", &reconParticles, kBufferSize);
+//____________________________________________________________________
+void
+AliFMDReconstructor::ProcessDigit(AliFMDDigit* digit) const
+{
+ // Process a digit. Derived classes can overload this member
+ // function to do stuff to the digit. However, it should write the
+ // ADC count to the internal cache
+ //
+ // fAdcs(detector - 1, ring, sector, strip) = counts;
+ //
+ // In this implementation, we count the number of strips below
+ // threshold. This we do to later choose what kind of
+ // reconstruction algorithm we'd like to use.
+ //
+ UShort_t detector = digit->Detector();
+ Char_t ring = digit->Ring();
+ UShort_t sector = digit->Sector();
+ UShort_t strip = digit->Strip();
+
+ UShort_t counts = SubtractPedestal(digit);
+
+ fAdcs(detector - 1, ring, sector, strip) = counts;
+ if (counts < fThreshold) fEmptyStrips++;
+ fTotalStrips++;
+}
-
- Int_t zeroADC=6;
- // read Digits
- AliFMDdigit *fmdDigit;
- if (plFMD->TreeD()->GetEvent(0))
- {
- Int_t nDigits=digits->GetEntries();
- Int_t recParticles[6];
- Int_t nRecPart=0 ;
- Int_t zeroPads=0;
- Int_t numberOfPads=0;
- Int_t pedestal;
- Float_t channelWidth=(22400*50)/1024;
- for (Int_t digit=0;digit<nDigits;digit++)
- {
- fmdDigit=(AliFMDdigit*)digits->UncheckedAt(digit);
- ivol=fmdDigit->Volume();
- iSector=fmdDigit->NumberOfSector();
- iRing=fmdDigit->NumberOfRing();
- pedestal=Int_t(gRandom->Gaus(500,250));
- padADC= fmdDigit->ADCsignal()
- -Int_t(Float_t(pedestal)/channelWidth);
- if (padADC<0) padADC=0;
- hTotal[ivol]->Fill(iSector,iRing,padADC);
- } //digit loop
-
- //reconstruct multiplicity in 0.1 eta according Poisson distribution
-
- Int_t rmin=0; Int_t rmax=0;
- Int_t smin=0; Int_t smax=0;
- for (ivol=0; ivol<knumVolumes; ivol++)
- {
- Float_t ring2number=Float_t (numberOfRings[ivol])/
- (rout[ivol]-rin[ivol]);
- Float_t realZ=zVertex+z[ivol];
- theta=TMath::ATan(rout[ivol]/TMath::Abs(realZ));
- etain = - TMath::Log( TMath::Tan(theta/2.));
- theta=TMath::ATan(rin[ivol]/TMath::Abs(realZ));
- etaout=- TMath::Log( TMath::Tan(theta/2.));
- numberOfEtaIntervals[ivol]=Int_t((etaout-etain)*10)-1;
- eta=etain;
- for (Int_t e1=0;e1<=numberOfEtaIntervals[ivol];e1++)
- {
- theta = 2.*TMath::ATan (TMath::Exp (-eta));
- Float_t radmin = TMath::Abs(realZ) * (TMath::Tan (theta));
- rmax= Int_t ( (radmin-rin[ivol])*ring2number+0.5);
- eta=eta+0.1;
- theta = 2.*TMath::ATan (TMath::Exp (-eta));
- rad = TMath::Abs(realZ) * (TMath::Tan (theta));
- rmin=Int_t( (rad-rin[ivol])*ring2number+0.5);
-
- zeroPads=0;
- smin=0;
- smax=numberOfSectors[ivol];
- numberOfPads=(rmax-rmin)*(smax-smin);
- for (Int_t iring=rmin; iring<rmax; iring++)
- {
- for
- (Int_t isector=0;
- isector<numberOfSectors[ivol];
- isector++)
- {
- if(hTotal[ivol+1]->GetBinContent(isector+1,iring+1)
- <zeroADC) zeroPads++;}
-
- } //ring
- Float_t numberOfPads=Float_t(smax-smin)*Float_t(rmax-rmin);
-
- Double_t lambda=-TMath::Log(Double_t(zeroPads)/numberOfPads);
- Int_t fRecon=Int_t (lambda*numberOfPads+0.5);
- recParticles[0]=ivol+1;
- recParticles[1]=smin;
- recParticles[2]=smax;
- recParticles[3]=rmin;
- recParticles[4]=rmax;
- recParticles[5]= fRecon;
- new((*reconParticles)[nRecPart++]) AliFMDReconstParticles(recParticles);
-
-
- } // eta
- } // volume
-
- }//if (plFMD->TreeD()->GetEvent(0))
- plFMD->TreeR()->Reset();
- plFMD->TreeR()->Fill();
- plFMD->WriteRecPoints("OVERWRITE");
- plFMD->UnloadDigits();
- } //event loop
- plFMD->UnloadRecPoints();
-#ifdef DEBUG
- Info(" Exec"," finished");
-#endif
- // delete hTotal[10];
+//____________________________________________________________________
+UShort_t
+AliFMDReconstructor::SubtractPedestal(AliFMDDigit* digit) const
+{
+ // Member function to subtract the pedestal from a digit
+ // This implementation does nothing, but a derived class could over
+ // load this to subtract a pedestal that was given in a database or
+ // something like that.
+ Int_t counts =
+ TMath::Max(Int_t(digit->Count1() - fPedestal - 3 * fPedestalWidth), 0);
+ if (digit->Count2() >= 0)
+ counts +=
+ TMath::Max(Int_t(digit->Count2() - fPedestal - 3 * fPedestalWidth), 0);
+ if (digit->Count3() >= 0)
+ counts +=
+ TMath::Max(Int_t(digit->Count3() - fPedestal - 3 * fPedestalWidth), 0);
+
+ if (counts < 0) counts = 0;
+ return UShort_t(counts);
}
+//____________________________________________________________________
+void
+AliFMDReconstructor::ReconstructFromCache(Float_t zVertex) const
+{
+ // Based on the information in the cache, do the reconstruction.
+ Int_t nRecon = 0;
+ // Loop over the detectors
+ for (Int_t i = 1; i <= 3; i++) {
+ AliFMDSubDetector* sub = 0;
+ switch (i) {
+ case 1: sub = fFMD->GetFMD1(); break;
+ case 2: sub = fFMD->GetFMD2(); break;
+ case 3: sub = fFMD->GetFMD3(); break;
+ }
+ if (!sub) continue;
+
+ // Loop over the rings in the detector
+ for (Int_t j = 0; j < 2; j++) {
+ Float_t rZ = 0;
+ AliFMDRing* r = 0;
+ switch (j) {
+ case 0: r = sub->GetInner(); rZ = sub->GetInnerZ(); break;
+ case 1: r = sub->GetOuter(); rZ = sub->GetOuterZ(); break;
+ }
+ if (!r) continue;
+
+ // Calculate low/high theta and eta
+ // FIXME: Is this right?
+ Float_t realZ = zVertex + rZ;
+ Float_t thetaOut = TMath::ATan2(r->GetHighR(), realZ);
+ Float_t thetaIn = TMath::ATan2(r->GetLowR(), realZ);
+ Float_t etaOut = - TMath::Log(TMath::Tan(thetaOut / 2));
+ Float_t etaIn = - TMath::Log(TMath::Tan(thetaIn / 2));
+ if (TMath::Abs(etaOut) > TMath::Abs(etaIn)) {
+ Float_t tmp = etaIn;
+ etaIn = etaOut;
+ etaOut = tmp;
+ }
+
+ //-------------------------------------------------------------
+ //
+ // Here starts poisson method
+ //
+ // Calculate eta step per strip, number of eta steps, number of
+ // phi steps, and check the sign of the eta increment
+ Float_t stripEta = (Float_t(r->GetNStrips()) / (etaIn - etaOut));
+ Int_t nEta = Int_t(TMath::Abs(etaIn - etaOut) / fDeltaEta);
+ Int_t nPhi = Int_t(360. / fDeltaPhi);
+ Float_t sign = TMath::Sign(Float_t(1.), etaIn);
-//_____________________________________________________________________________
-void AliFMDReconstructor::FillESD(AliRunLoader* /*runLoader*/,
- AliESD* /*esd*/) const
+ AliDebug(10, Form("FMD%d%c Eta range: %f, %f %d Phi steps",
+ sub->GetId(), r->GetId(), etaOut, etaIn, nPhi));
+
+ // Loop over relevant phi values
+ for (Int_t p = 0; p < nPhi; p++) {
+ Float_t minPhi = p * fDeltaPhi;
+ Float_t maxPhi = minPhi + fDeltaPhi;
+ UShort_t minSector = UShort_t(minPhi / 360) * r->GetNSectors();
+ UShort_t maxSector = UShort_t(maxPhi / 360) * r->GetNSectors();
+
+ AliDebug(10, Form(" Now in phi range %f, %f (sectors %d,%d)",
+ minPhi, maxPhi, minSector, maxSector));
+ // Loop over relevant eta values
+ for (Int_t e = nEta; e >= 0; --e) {
+ Float_t maxEta = etaIn - sign * e * fDeltaEta;
+ Float_t minEta = maxEta - sign * fDeltaEta;
+ if (sign > 0) minEta = TMath::Max(minEta, etaOut);
+ else minEta = TMath::Min(minEta, etaOut);
+ Float_t theta1 = 2 * TMath::ATan(TMath::Exp(-minEta));
+ Float_t theta2 = 2 * TMath::ATan(TMath::Exp(-maxEta));
+ Float_t minR = TMath::Abs(realZ * TMath::Tan(theta2));
+ Float_t maxR = TMath::Abs(realZ * TMath::Tan(theta1));
+ UShort_t minStrip = UShort_t((etaIn - maxEta) * stripEta + 0.5);
+ UShort_t maxStrip = UShort_t((etaIn - minEta) * stripEta + 0.5);
+
+ AliDebug(10, Form(" Now in eta range %f, %f (strips %d, %d)\n"
+ " [radii %f, %f, thetas %f, %f, sign %d]",
+ minEta, maxEta, minStrip, maxStrip,
+ minR, maxR, theta1, theta2, sign));
+
+ // Count number of empty strips
+ Int_t emptyStrips = 0;
+ for (Int_t sector = minSector; sector < maxSector; sector++)
+ for (Int_t strip = minStrip; strip < maxStrip; strip++)
+ if (fAdcs(sub->GetId() - 1, r->GetId(), sector, strip)
+ < fThreshold) emptyStrips++;
+
+ // The total number of strips
+ Float_t nTotal = (maxSector - minSector) * (maxStrip - minStrip);
+
+ // Log ratio of empty to total number of strips
+ AliDebug(10, Form("Lambda= %d / %d = %f",
+ emptyStrips, nTotal,
+ Float_t(emptyStrips) / nTotal));
+
+ Double_t lambda = (emptyStrips > 0 ?
+ - TMath::Log(Double_t(emptyStrips) / nTotal) :
+ 1);
+
+ // The reconstructed number of particles is then given by
+ Int_t reconstructed = Int_t(lambda * nTotal + 0.5);
+
+ // Add a AliFMDParticles to the reconstruction tree.
+ new((*fParticles)[nRecon])
+ AliFMDParticles(sub->GetId(), r->GetId(),
+ minSector, maxSector, minStrip, maxStrip,
+ minEta, maxEta, minPhi, maxPhi,
+ reconstructed, AliFMDParticles::kPoission);
+ nRecon++;
+ } // phi
+ } // eta
+ } // ring
+ } // detector
+}
+
+
+//____________________________________________________________________
+void
+AliFMDReconstructor::FillESD(AliRunLoader* /*fRunLoader*/,
+ AliESD* /*esd*/) const
{
// nothing to be done
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff