+++ /dev/null
-/**************************************************************************
-* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
-* *
-* Author: The ALICE Off-line Project. *
-* Contributors are mentioned in the code where appropriate. *
-* *
-* Permission to use, copy, modify and distribute this software and its *
-* documentation strictly for non-commercial purposes is hereby granted *
-* without fee, provided that the above copyright notice appears in all *
-* copies and that both the copyright notice and this permission notice *
-* appear in the supporting documentation. The authors make no claims *
-* about the suitability of this software for any purpose. It is *
-* provided "as is" without express or implied warranty. *
-**************************************************************************/
-
-// $Id$
-
-#include "AliMUONTriggerTrackToTrackerClusters.h"
-
-///\class AliMUONTriggerTrackToTrackerClusters
-///
-/// Class to convert trigger tracks into "fake" clusters in stations 4 and 5
-///
-/// Only intent is to be able to reconstruct data where stations 4 and 5 were
-/// not functionning, typically early cosmic runs
-///
-///\author Laurent Aphecetche, Subatech
-
-#include "AliCodeTimer.h"
-#include "AliLog.h"
-#include "AliMUONConstants.h"
-#include "AliMUONGeometryTransformer.h"
-#include "AliMUONTrack.h"
-#include "AliMUONTrackExtrap.h"
-#include "AliMUONTriggerTrack.h"
-#include "AliMUONVCluster.h"
-#include "AliMUONVClusterStore.h"
-#include "AliMUONVTriggerTrackStore.h"
-#include "AliMUONTrackParam.h"
-#include "AliMpArea.h"
-#include "AliMpDEManager.h"
-#include <TMath.h>
-
-///\cond CLASSIMP
-ClassImp(AliMUONTriggerTrackToTrackerClusters)
-///\endcond
-
-//_____________________________________________________________________________
-AliMUONTriggerTrackToTrackerClusters::AliMUONTriggerTrackToTrackerClusters(const AliMUONGeometryTransformer& transformer,
- AliMUONVTriggerTrackStore* trackStore)
-: TObject(), fkTransformer(transformer), fTriggerTrackStore(trackStore)
-{
- /// ctor. We do not take ownership of the trigger track store.
-}
-
-//_____________________________________________________________________________
-AliMUONTriggerTrackToTrackerClusters::~AliMUONTriggerTrackToTrackerClusters()
-{
- /// dtor
-}
-
-//_____________________________________________________________________________
-Int_t
-AliMUONTriggerTrackToTrackerClusters::DetElemId(Int_t chamber, Double_t x, Double_t y,
- Double_t ex, Double_t ey,
- Double_t& z) const
-{
- /// Find in which detection element (x,y) (global) position is.
-
- AliMpDEIterator it;
-
- AliMpArea a(x, y, ex, ey);
-
- it.First(chamber);
-
- while ( !it.IsDone() )
- {
- Int_t detElemId = it.CurrentDEId();
-
- AliMpArea* area = fkTransformer.GetDEArea(detElemId);
-
- if ( area->Overlap(a) )
- {
- // get z of the center of that DE.
- Double_t dummyx, dummyy;
- fkTransformer.Local2Global(detElemId,0,0,0,dummyx,dummyy,z);
- return detElemId;
- }
- it.Next();
- }
-
- return -1;
-}
-
-//_____________________________________________________________________________
-Int_t
-AliMUONTriggerTrackToTrackerClusters::GenerateClusters(Int_t iChamber,
- AliMUONVClusterStore& clusterStore) const
-{
- /// Generate clusters in given chamber
- /// Return the number of clusters added to the clusterStore
-
- AliCodeTimerAuto(Form("Chamber %d",iChamber),0);
-
- TIter next(fTriggerTrackStore->CreateIterator());
-
- AliMUONTriggerTrack* track;
- Int_t nadded(0);
-
- while ( ( track = static_cast<AliMUONTriggerTrack*>(next()) ) )
- {
- nadded += GenerateClusters(iChamber,*track,clusterStore);
- }
- return nadded;
-}
-
-//_____________________________________________________________________________
-Int_t
-AliMUONTriggerTrackToTrackerClusters::GenerateClusters(Int_t iChamber,
- const AliMUONTriggerTrack& track,
- AliMUONVClusterStore& clusterStore) const
-{
- /// From a trigger track, generate 1 cluster in given chamber
-
- /// Get a (rough) guestimate of the track momentum
-
- Int_t nadded(0);
-
- Double_t z = AliMUONConstants::DefaultChamberZ(10);
-
- Double_t bendingCoord = track.GetY11();
- Double_t bendingSlope = TMath::Tan(track.GetThetay());
-
- Double_t bendingImpact = bendingCoord - z * bendingSlope;
-
- AliDebug(1,Form("TriggerTrack impact parameter=%e",bendingImpact));
-
- // StdoutToAliDebug(1,track.Print());
-
- Double_t inverseBendingMomentum = 1. / AliMUONTrackExtrap::GetBendingMomentumFromImpactParam(bendingImpact);
-
- // Construct an AliMUONTrackParam from the trigger track, in order to be able to extrapolate it
- // to chambers 6..9 planes.
-
- AliMUONTrackParam trackParam;
-
- trackParam.SetZ(z);
- trackParam.SetNonBendingCoor(track.GetX11());
- trackParam.SetNonBendingSlope(TMath::Tan(track.GetThetax()));
- trackParam.SetBendingCoor(bendingCoord);
- trackParam.SetBendingSlope(bendingSlope);
- trackParam.SetInverseBendingMomentum(inverseBendingMomentum);
-
- Double_t dZ = AliMUONConstants::DefaultChamberZ(10) - AliMUONConstants::DefaultChamberZ(12);
-
- Double_t sigmaX = AliMUONConstants::TriggerNonBendingReso();
-
- Double_t sigmaY = AliMUONConstants::TriggerBendingReso();
-
- // Compute and set track parameters covariances
- TMatrixD paramCov(5,5);
- paramCov.Zero();
-
- // Non bending plane
- paramCov(0,0) = sigmaX*sigmaX;
- paramCov(0,1) = paramCov(0,0)/dZ;
- paramCov(1,0) = paramCov(0,1);
- paramCov(1,1) = 2.0*paramCov(0,0)/dZ/dZ;
-
- // Bending plane
- paramCov(2,2) = sigmaY*sigmaY;
- paramCov(2,3) = paramCov(2,2)/dZ;
- paramCov(3,2) = paramCov(2,3);
- paramCov(3,3) = 2.0*paramCov(2,2)/dZ/dZ;
-
- // Inverse bending momentum (50% error)
- paramCov(4,4) = 0.5*inverseBendingMomentum * 0.5*inverseBendingMomentum;
-
- // Set covariances
- trackParam.SetCovariances(paramCov);
-
- // add MCS effect in the iron wall
- const Float_t kFilterThickness = AliMUONConstants::MuonFilterZEnd()-AliMUONConstants::MuonFilterZBeg(); // cm
- AliMUONTrackExtrap::ExtrapToZCov(&trackParam, AliMUONConstants::MuonFilterZEnd()); // Extrap to iChamber
- AliMUONTrackExtrap::AddMCSEffect(&trackParam, kFilterThickness, AliMUONConstants::MuonFilterX0()); // Add MCS effects
-
- // Now we extrapolate this trackParam to chambers 6 -> 9
- Int_t nclusters = clusterStore.GetSize();
-
- AliMUONTrackParam tp(trackParam);
-
- Double_t zg = AliMUONConstants::DefaultChamberZ(iChamber);
- AliMUONTrackExtrap::ExtrapToZCov(&tp, zg); // Extrap to iChamber
-
-
- AliDebug(1,Form("iChamber=%d",iChamber));
-
- StdoutToAliDebug(1,tp.Print("FULLCOV"););
-
- Double_t x = tp.GetNonBendingCoor();
- Double_t y = tp.GetBendingCoor();
- const TMatrixD& cov = tp.GetCovariances();
- Double_t ex = TMath::Sqrt(cov(0,0));
- Double_t ey = TMath::Sqrt(cov(2,2));
-
- Double_t zde;
-
- Int_t detElemId = DetElemId(iChamber,x,y,ex,ey,zde);
-
- AliDebug(1,Form("zg = %e zde = %e",zg,zde));
-
- if ( AliMpDEManager::IsValidDetElemId(detElemId) )
- {
- AliMUONVCluster* rawCluster = clusterStore.Add(AliMpDEManager::GetChamberId(detElemId), detElemId, nclusters);
-
- ++nclusters;
- ++nadded;
-
- rawCluster->SetCharge(100.0);
- rawCluster->SetXYZ(x, y, zg);
- rawCluster->SetErrXY(ex,ey);
- }
- else
- {
- AliWarning(Form("No DE found at xg=%e yg=%e",x,y));
- }
-
- return nadded;
-}
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff