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Status and Prospects of HARPStatus and Prospects of HARP
Malcolm Ellis
On behalf of the HARP Collaboration
NuFact02
Imperial College, July 2002
2
The HARP Collaboration:The HARP Collaboration:
Università degli Studi e Sezione INFN, Bari, Italy
Rutherford Appleton Laboratory, Chilton, Didcot, UK
Institut für Physik, Universität Dortmund, Germany
Joint Institute for Nuclear Research, JINR Dubna, Russia
Università degli Studi e Sezione INFN, Ferrara, Italy
CERN, Geneva, Switzerland
Section de Physique, Université de Genève, Switzerland
Laboratori Nazionali di Legnaro dell' INFN, Legnaro, Italy
Institut de Physique Nucléaire, UCL, Louvain-la-Neuve, Belgium
Università degli Studi e Sezione INFN, Milano, Italy
P.N. Lebedev Institute of Physics (FIAN), Russian Academy of Sciences, Moscow, Russia
Institute for Nuclear Research, Moscow, Russia
Università "Federico II" e Sezione INFN, Napoli, Italy
Nuclear and Astrophysics Laboratory, University of Oxford, UK
Università degli Studi e Sezione INFN, Padova, Italy
LPNHE, Université de Paris VI et VII, Paris, France
Institute for High Energy Physics, Protvino, Russia
Università "La Sapienza" e Sezione INFN Roma I, Roma, Italy
Università degli Studi e Sezione INFN Roma III, Roma, Italy
Dept. of Physics, University of Sheffield, UK
Faculty of Physics, St Kliment Ohridski University, Sofia, Bulgaria
Institute for Nuclear Research and Nuclear Energy, Academy of Sciences, Sofia, Bulgaria
Università di Trieste e Sezione INFN, Trieste, Italy
Univ. de Valencia, Spain
3
OutlineOutline
Motivation Timeline The Detector Data taking:
– 2001– 2002
Software/Analysis Prospects
4
MotivationMotivation
Neutrino Factory Atmospheric Neutrinos Monte Carlo K2K and MiniBooNE Experiments Aim:
– Measure Hadronic d/dPT/dPL over range of momenta, target Z and thickness
– Few% accuracy over all phase space, requires ~106 events per setting and low systematics.
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TimelineTimeline
Proposed: November 1999Approved: February 2000Technical Run: September 2000Data Taking:
– Solid Targets: 2001– Solid & Cryogenic Targets: 2002
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The DetectorThe Detector
Main Requirements:– Acceptance, PID, Redundancy
Beam instrumentation provides tracking and PID of incoming particle.
TPC surrounds target to provide close to 4 coverage.
Forward Spectrometer covers insensitive region of TPC.
PID completed with Cherenkov, TOF and Calorimetry.
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The HARP DetectorThe HARP Detector
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Particle ID CoverageParticle ID Coverage
TPCTPC
TOFTOF
CherenkovCherenkov
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CERN PS East HallCERN PS East Hall
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HARP in 2001HARP in 2001
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Beam and TargetsBeam and Targets
target tubetarget holder
Extrapolated positionof MWPC tracks at the target
Beam:• ±3 ±5 ±8 ±12 ±15 GeV/cSolid Targets:• Be, C, Al, Cu, Sn, Ta, Pb• Thin (2%)• Thick (100%)• 5% Targets (New)• MiniBooNE• K2K• Skew Copper• AlignmentCryogenic Targets:• H2/D2 N2/O2
12
Cryogenic TargetsCryogenic Targets
element H2 D2 N2 O2
boiling temp. 20.4 K 23.6 K 77.4 K 99.2 K
# 0.84 % 2.13 % 5.52 % 7.52 %
•Targets 2cm diameter, 6cm long.•Two distinct setups:
N2/O2 – Mid JulyH2/D2 – Early August
•Filling takes 4-6 hours.•Emptying takes ~1 hour.
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2001 Data Taking2001 Data Taking
Completed 1/3 of Solid Target Programme:
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2002 Data Taking2002 Data Taking
Programme (May-September):– Thick Targets– 5% Targets +ve and –ve beams– Remaining Solid Targets– Cryogenic Targets (start 8th July)– MiniBooNE Programme (12th August)– K2K Programme (26th August)
15
TriggerTrigger
beam
Forward trigger plane (FTP)
Inner Trigger Cilinder (ITC)
Consequence: 1/2 to 2/3 of our thin-target data are non-interacting beam particles
•Solution:•Non-Interacting Beam (NIB) veto counters – under study•5% Targets
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Software ProcessesSoftware Processes Stringent time schedule required adoption of software engineering
standards. Domains identification & dependency structure lead to:
– definition of releasable units (libraries and source code),– definition of working groups (and schedules),– definition of ordering for unit&system testing and for release.
DetResponseDetResponse
HarpUIHarpUI
ObjyHarpObjyHarp
ReconstructionReconstruction
ObjectCnvObjectCnv
ROOT ROOT GEANT4GEANT4
DetRepDetRep
GaudiFramework
GaudiFramework
HarpEventHarpEventHarpDDHarpDD
CLHEP+ STL
CLHEP+ STL
DAQDAQ
SimulationSimulation
DATEDATE
EventSelector
EventSelector
ObjyPersistency
ObjyPersistency
HEPODBMSObjectivity
HEPODBMSObjectivity
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Software/AnalysisSoftware/Analysis
DAQ and detectors readout (DATE).
Storage and retrieval of physics data and settings (Objectivity DB,
AMS-HPSS interface).
Framework including application manager, interfaces & data exchange
for the components, and event model (GAUDI).
Physics Simulation & Detector Model (GEANT4).
Physics Reconstruction for all detectors.
Online Monitoring & Offline Calibration of detectors.
User Interface and Event Display (ROOT).
Foundation libs & Utilities (STL, CLHEP).
18
Beam InstrumentationBeam Instrumentation
•Beam Particles tracked by 4 MWPCs•Particle ID performed by:
•Cherenkov, TOF, identifier
19
TPCTPC
•Gas Choice: 90% Ar, 10% C02
•Gas Speed 5cm/s•Total drift time: 32 s 320 time samples•Cross-Talk problems under investigation
20
TPC – Reconstructed TracksTPC – Reconstructed Tracks
PT vs PL for Thick Target DataPT for all TPC Tracks
21
RPCsRPCs
22
RPC/TPC MatchingRPC/TPC Matching
2 mm stesalite wallTarget (fixed to the magnet)
(fixed to the TPC)
• RPC are fully efficient and noise-free
• RPC timing removes off-time tracks
23
NOMAD Drift ChambersNOMAD Drift Chambers
•Efficiency reduced due to change of gas: •90% Ar, 9% CO2, 1% CH4
•Calibration and Alignment ongoing
24
CherenkovCherenkov
2.6 GeV/c
9.3 GeV/c
p 17.6 GeV/c
Thresholds:
•Gas Leakage problem emerged in the commissioning phase:
•Support structure re-welded
•Epoxy-treatment of inner surfaces.
•Leak rate ~ 4L/hour
•Specifications: 4 L/hour.
•Density monitored by sonartechniques (acoustic wave phase shift) <1% precision.
25
TOF WallTOF Wall
pions
protons
•Calibration:•Laser•Cosmic Rays•Pulse Calibration
Example: time separationand resolution for 3 GeV/cbeam particles.
26
CalorimeterCalorimeter
•Three modules: 62 EM (4cm), 80 HAD (8cm) & Muon Identifier•Electron Identifier (EM+HAD) 6.72m wide x 3.3m high.•Muon Identifier is 6.44 Interaction Lengths of Iron and Scintillator slabs.
27
ProspectsProspects
Complete Data-Taking 30th September Analyses Initially Separated:
– Large Angle (TPC/RPC)– Small Angle (Forward Spectrometer)
Expect to overcome TPC cross-talk problems, thus achieve design accuracy.
Aiming for initial results by the end of this year.