@author Christian Holm Christensen <cholm@nbi.dk>
@date Mon Mar 27 12:38:26 2006
@brief FMD Digitizers implementation
+ @ingroup FMD_sim
*/
//////////////////////////////////////////////////////////////////////////////
//
//
#include <TTree.h> // ROOT_TTree
-#include <TRandom.h> // ROOT_TRandom
+//#include <TRandom.h> // ROOT_TRandom
#include <AliLog.h> // ALILOG_H
#include "AliFMDDigitizer.h" // ALIFMDDIGITIZER_H
#include "AliFMD.h" // ALIFMD_H
#include <AliLoader.h> // ALILOADER_H
#include <AliRunLoader.h> // ALIRUNLOADER_H
-//====================================================================
-ClassImp(AliFMDBaseDigitizer)
-#if 0
- ; // This is here to keep Emacs for indenting the next line
-#endif
-
-//____________________________________________________________________
-AliFMDBaseDigitizer::AliFMDBaseDigitizer()
- : fRunLoader(0)
-{
- // Default ctor - don't use it
-}
-
-//____________________________________________________________________
-AliFMDBaseDigitizer::AliFMDBaseDigitizer(AliRunDigitizer* manager)
- : AliDigitizer(manager, "AliFMDBaseDigitizer", "FMD Digitizer base class"),
- fRunLoader(0),
- fEdep(AliFMDMap::kMaxDetectors,
- AliFMDMap::kMaxRings,
- AliFMDMap::kMaxSectors,
- AliFMDMap::kMaxStrips)
-{
- // Normal CTOR
- AliDebug(1," processed");
- SetShapingTime();
-}
-
-//____________________________________________________________________
-AliFMDBaseDigitizer::AliFMDBaseDigitizer(const Char_t* name,
- const Char_t* title)
- : AliDigitizer(name, title),
- fRunLoader(0),
- fEdep(AliFMDMap::kMaxDetectors,
- AliFMDMap::kMaxRings,
- AliFMDMap::kMaxSectors,
- AliFMDMap::kMaxStrips)
-{
- // Normal CTOR
- AliDebug(1," processed");
- SetShapingTime();
-}
-
-//____________________________________________________________________
-AliFMDBaseDigitizer::~AliFMDBaseDigitizer()
-{
- // Destructor
-}
-
-//____________________________________________________________________
-Bool_t
-AliFMDBaseDigitizer::Init()
-{
- // Initialization
- AliFMDParameters::Instance()->Init();
- return kTRUE;
-}
-
-
-//____________________________________________________________________
-UShort_t
-AliFMDBaseDigitizer::MakePedestal(UShort_t,
- Char_t,
- UShort_t,
- UShort_t) const
-{
- return 0;
-}
-
-//____________________________________________________________________
-void
-AliFMDBaseDigitizer::SumContributions(AliFMD* fmd)
-{
- // Sum energy deposited contributions from each hit in a cache
- // (fEdep).
- if (!fRunLoader)
- Fatal("SumContributions", "no run loader");
-
- // Clear array of deposited energies
- fEdep.Reset();
-
- // Get the FMD loader
- AliLoader* inFMD = fRunLoader->GetLoader("FMDLoader");
- // And load the hits
- inFMD->LoadHits("READ");
-
- // Get the tree of hits
- TTree* hitsTree = inFMD->TreeH();
- if (!hitsTree) {
- // Try again
- inFMD->LoadHits("READ");
- hitsTree = inFMD->TreeH();
- }
-
- // Get the FMD branch
- TBranch* hitsBranch = hitsTree->GetBranch("FMD");
- if (hitsBranch) fmd->SetHitsAddressBranch(hitsBranch);
- else AliFatal("Branch FMD hit not found");
-
- // Get a list of hits from the FMD manager
- TClonesArray *fmdHits = fmd->Hits();
-
- // Get number of entries in the tree
- Int_t ntracks = Int_t(hitsTree->GetEntries());
-
- AliFMDParameters* param = AliFMDParameters::Instance();
- Int_t read = 0;
- // Loop over the tracks in the
- for (Int_t track = 0; track < ntracks; track++) {
- // Read in entry number `track'
- read += hitsBranch->GetEntry(track);
-
- // Get the number of hits
- Int_t nhits = fmdHits->GetEntries ();
- for (Int_t hit = 0; hit < nhits; hit++) {
- // Get the hit number `hit'
- AliFMDHit* fmdHit =
- static_cast<AliFMDHit*>(fmdHits->UncheckedAt(hit));
-
- // Extract parameters
- UShort_t detector = fmdHit->Detector();
- Char_t ring = fmdHit->Ring();
- UShort_t sector = fmdHit->Sector();
- UShort_t strip = fmdHit->Strip();
- Float_t edep = fmdHit->Edep();
- UShort_t minstrip = param->GetMinStrip(detector, ring, sector, strip);
- UShort_t maxstrip = param->GetMaxStrip(detector, ring, sector, strip);
- // Check if strip is `dead'
- if (param->IsDead(detector, ring, sector, strip)) {
- AliDebug(5, Form("FMD%d%c[%2d,%3d] is marked as dead",
- detector, ring, sector, strip));
- continue;
- }
- // Check if strip is out-side read-out range
- if (strip < minstrip || strip > maxstrip) {
- AliDebug(5, Form("FMD%d%c[%2d,%3d] is outside range [%3d,%3d]",
- detector, ring, sector, strip, minstrip, maxstrip));
- continue;
- }
-
- // Give warning in case of double hit
- if (fEdep(detector, ring, sector, strip).fEdep != 0)
- AliDebug(5, Form("Double hit in %d%c(%d,%d)",
- detector, ring, sector, strip));
-
- // Sum energy deposition
- fEdep(detector, ring, sector, strip).fEdep += edep;
- fEdep(detector, ring, sector, strip).fN += 1;
- // Add this to the energy deposited for this strip
- } // hit loop
- } // track loop
- AliDebug(1, Form("Size of cache: %d bytes, read %d bytes",
- sizeof(fEdep), read));
-}
-
-//____________________________________________________________________
-void
-AliFMDBaseDigitizer::DigitizeHits(AliFMD* fmd) const
-{
- // For the stored energy contributions in the cache (fEdep), convert
- // the energy signal to ADC counts, and store the created digit in
- // the digits array (AliFMD::fDigits)
- //
- AliFMDGeometry* geometry = AliFMDGeometry::Instance();
-
- TArrayI counts(3);
- for (UShort_t detector=1; detector <= 3; detector++) {
- // Get pointer to subdetector
- AliFMDDetector* det = geometry->GetDetector(detector);
- if (!det) continue;
- for (UShort_t ringi = 0; ringi <= 1; ringi++) {
- Char_t ring = ringi == 0 ? 'I' : 'O';
- // Get pointer to Ring
- AliFMDRing* r = det->GetRing(ring);
- if (!r) continue;
-
- // Get number of sectors
- UShort_t nSectors = UShort_t(360. / r->GetTheta());
- // Loop over the number of sectors
- for (UShort_t sector = 0; sector < nSectors; sector++) {
- // Get number of strips
- UShort_t nStrips = r->GetNStrips();
- // Loop over the stips
- Float_t last = 0;
- for (UShort_t strip = 0; strip < nStrips; strip++) {
- // Reset the counter array to the invalid value -1
- counts.Reset(-1);
- // Reset the last `ADC' value when we've get to the end of a
- // VA1_ALICE channel.
- if (strip % 128 == 0) last = 0;
-
- Float_t edep = fEdep(detector, ring, sector, strip).fEdep;
- ConvertToCount(edep, last, detector, ring, sector, strip, counts);
- last = edep;
- AddDigit(fmd, detector, ring, sector, strip, edep,
- UShort_t(counts[0]), Short_t(counts[1]),
- Short_t(counts[2]));
-#if 0
- // This checks if the digit created will give the `right'
- // number of particles when reconstructed, using a naiive
- // approach. It's here only as a quality check - nothing
- // else.
- CheckDigit(digit, fEdep(detector, ring, sector, strip).fN,
- counts);
-#endif
- } // Strip
- } // Sector
- } // Ring
- } // Detector
-}
-
-//____________________________________________________________________
-void
-AliFMDBaseDigitizer::ConvertToCount(Float_t edep,
- Float_t last,
- UShort_t detector,
- Char_t ring,
- UShort_t sector,
- UShort_t strip,
- TArrayI& counts) const
-{
- // Convert the total energy deposited to a (set of) ADC count(s).
- //
- // This is done by
- //
- // Energy_Deposited ALTRO_Channel_Size
- // ADC = -------------------------- ------------------- + pedestal
- // Energy_Deposition_Of_1_MIP VA1_ALICE_MIP_Range
- //
- // Energy_Deposited fAltroChannelSize
- // = --------------------------------- ----------------- + pedestal
- // 1.664 * Si_Thickness * Si_Density fVA1MipRange
- //
- //
- // = Energy_Deposited * ConversionFactor + pedestal
- //
- // However, this is modified by the response function of the
- // VA1_ALICE pre-amp. chip in case we are doing oversampling of the
- // VA1_ALICE output.
- //
- // In that case, we get N=fSampleRate values of the ADC, and the
- // `EnergyDeposited' is a function of which sample where are
- // calculating the ADC for
- //
- // ADC_i = f(EnergyDeposited, i/N, Last) * ConversionFactor + pedestal
- //
- // where Last is the Energy deposited in the previous strip.
- //
- // Here, f is the shaping function of the VA1_ALICE. This is given
- // by
- //
- // | (E - l) * (1 - exp(-B * t) + l if E > l
- // f(E, t, l) = <
- // | (l - E) * exp(-B * t) + E otherwise
- //
- //
- // = E + (l - E) * ext(-B * t)
- //
- AliFMDParameters* param = AliFMDParameters::Instance();
- Float_t convF = 1/param->GetPulseGain(detector,ring,sector,strip);
- UShort_t ped = MakePedestal(detector,ring,sector,strip);
- UInt_t maxAdc = param->GetAltroChannelSize();
- UShort_t rate = param->GetSampleRate(detector,ring,sector,strip);
- UShort_t size = param->GetAltroChannelSize();
-
- // In case we don't oversample, just return the end value.
- if (rate == 1) {
- counts[0] = UShort_t(TMath::Min(edep * convF + ped, Float_t(size)));
- return;
- }
-
- // Create a pedestal
- Float_t b = fShapingTime;
- for (Ssiz_t i = 0; i < rate; i++) {
- Float_t t = Float_t(i) / rate;
- Float_t s = edep + (last - edep) * TMath::Exp(-b * t);
- counts[i] = UShort_t(TMath::Min(s * convF + ped, Float_t(maxAdc)));
- }
-}
-
-
//====================================================================
ClassImp(AliFMDDigitizer)
mips, nhits);
}
-//====================================================================
-ClassImp(AliFMDSDigitizer)
-
-//____________________________________________________________________
-AliFMDSDigitizer::AliFMDSDigitizer()
-{
- // Default ctor - don't use it
-}
-
-//____________________________________________________________________
-AliFMDSDigitizer::AliFMDSDigitizer(const Char_t* headerFile,
- const Char_t* /* sdigfile */)
- : AliFMDBaseDigitizer("FMDSDigitizer", "FMD SDigitizer")
-{
- // Normal CTOR
- AliDebug(1," processed");
-
- fRunLoader = AliRunLoader::GetRunLoader(); // Open(headerFile);
- if (!fRunLoader)
- Fatal("AliFMDSDigitizer", "cannot open session, header file '%s'",
- headerFile);
- AliLoader* loader = fRunLoader->GetLoader("FMDLoader");
- if (!loader)
- Fatal("AliFMDSDigitizer", "cannot find FMD loader in specified event");
-
- // Add task to tasks folder
- loader->PostSDigitizer(this);
-
-}
-
-//____________________________________________________________________
-AliFMDSDigitizer::~AliFMDSDigitizer()
-{
- // Destructor
- AliLoader* loader = fRunLoader->GetLoader("FMDLoader");
- loader->CleanSDigitizer();
-}
-
-//____________________________________________________________________
-void
-AliFMDSDigitizer::Exec(Option_t*)
-{
- // Get the output manager
- if (!fRunLoader) {
- Error("Exec", "Run loader is not set");
- return;
- }
- if (!fRunLoader->GetAliRun()) fRunLoader->LoadgAlice();
- if (!fRunLoader->TreeE()) fRunLoader->LoadHeader();
-
- AliLoader* fmdLoader = fRunLoader->GetLoader("FMDLoader");
- if (!fmdLoader) Fatal("Exec", "no FMD loader");
-
- // Get the AliFMD object
- AliFMD* fmd =
- static_cast<AliFMD*>(fRunLoader->GetAliRun()->GetDetector("FMD"));
- if (!fmd) {
- AliError("Can not get FMD from gAlice");
- return;
- }
-
- Int_t nEvents = Int_t(fRunLoader->TreeE()->GetEntries());
- for (Int_t event = 0; event < nEvents; event++) {
- AliDebug(1,Form(" Digitizing event number %d", event));
- // Get the current loader
- fRunLoader->GetEvent(event);
-
- if (!fmdLoader->TreeS()) fmdLoader->MakeTree("S");
- // Make a branch
- fmd->MakeBranch("S");
-
- // Cache contriutions
- SumContributions(fmd);
-
- // Digitize the event
- DigitizeHits(fmd);
-
- fmdLoader->TreeS()->Reset();
- fmdLoader->TreeS()->Fill();
- fmdLoader->WriteSDigits("OVERWRITE");
- }
-}
-
-//____________________________________________________________________
-void
-AliFMDSDigitizer::AddDigit(AliFMD* fmd,
- UShort_t detector,
- Char_t ring,
- UShort_t sector,
- UShort_t strip,
- Float_t edep,
- UShort_t count1,
- Short_t count2,
- Short_t count3) const
-{
- // Add a summable digit
- fmd->AddSDigitByFields(detector, ring, sector, strip, edep,
- count1, count2, count3);
-}
-
-
-
//____________________________________________________________________
//
// EOF
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff