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Status and Prospects of HARP. Malcolm Ellis On behalf of the HARP Collaboration NuFact02 Imperial College, July 2002. The HARP Collaboration:. Università degli Studi e Sezione INFN, Bari, Italy Rutherford Appleton Laboratory, Chilton, Didcot, UK

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status and prospects of harp

Status and Prospects of HARP

Malcolm Ellis

On behalf of the HARP Collaboration

NuFact02

Imperial College, July 2002

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

outline
Outline
  • Motivation
  • Timeline
  • The Detector
  • Data taking:
    • 2001
    • 2002
  • Software/Analysis
  • Prospects
motivation
Motivation
  • Neutrino Factory
  • Atmospheric Neutrinos
  • Monte Carlo
  • K2K and MiniBooNE Experiments
  • Aim:
    • Measure Hadronic ds/dPT/dPL over range of momenta, target Z and thickness
    • Few% accuracy over all phase space, requires ~106 events per setting and low systematics.
timeline
Timeline
  • Proposed: November 1999
  • Approved: February 2000
  • Technical Run: September 2000
  • Data Taking:
    • Solid Targets: 2001
    • Solid & Cryogenic Targets: 2002
the detector
The Detector
  • Main Requirements:
    • Acceptance, PID, Redundancy
  • Beam instrumentation provides tracking and PID of incoming particle.
  • TPC surrounds target to provide close to 4p coverage.
  • Forward Spectrometer covers insensitive region of TPC.
  • PID completed with Cherenkov, TOF and Calorimetry.
particle id coverage
Particle ID Coverage

TPC

TOF

Cherenkov

beam and targets
Beam and Targets
  • Beam:
  • ±3 ±5 ±8 ±12 ±15 GeV/c
  • Solid Targets:
  • Be, C, Al, Cu, Sn, Ta, Pb
  • Thin (2%)
  • Thick (100%)
  • 5% Targets (New)
  • MiniBooNE
  • K2K
  • Skew Copper
  • Alignment
  • Cryogenic Targets:
  • H2/D2 N2/O2

target tube

target holder

Extrapolated position

of MWPC tracks at the target

cryogenic 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 %

Cryogenic Targets
  • Targets 2cm diameter, 6cm long.
  • Two distinct setups:
    • N2/O2 – Mid July
    • H2/D2 – Early August
  • Filling takes 4-6 hours.
  • Emptying takes ~1 hour.
2001 data taking
2001 Data Taking
  • Completed 1/3 of Solid Target Programme:
2002 data taking
2002 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)
trigger
Trigger

Forward trigger plane (FTP)

Consequence: 1/2 to 2/3 of our thin-target data are non-interacting beam particles

beam

Inner Trigger Cilinder (ITC)

  • Solution:
    • Non-Interacting Beam (NIB) veto counters – under study
    • 5% Targets
software processes

DetResponse

HarpUI

Reconstruction

Simulation

Event

Selector

Objy

Persistency

DetRep

ObjyHarp

ObjectCnv

HarpDD

HarpEvent

Gaudi

Framework

DAQ

ROOT

GEANT4

CLHEP

+ STL

HEPODBMS

Objectivity

DATE

Software 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.
software analysis
Software/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).
beam instrumentation
Beam Instrumentation
  • Beam Particles tracked by 4 MWPCs
  • Particle ID performed by:
    • Cherenkov, TOF, m identifier
slide19
TPC
  • Gas Choice: 90% Ar, 10% C02
  • Gas Speed 5cm/ms
  • Total drift time: 32 ms  320 time samples
  • Cross-Talk problems under investigation
tpc reconstructed tracks
TPC – Reconstructed Tracks

PT vs PL for Thick Target Data

PT for all TPC Tracks

rpc tpc matching
RPC/TPC Matching
  • RPC are fully efficient and noise-free
  • RPC timing removes off-time tracks

2 mm stesalite wall

Target (fixed to the magnet)

(fixed to the TPC)

nomad drift chambers
NOMAD Drift Chambers
  • Efficiency reduced due to change of gas:
  • 90% Ar, 9% CO2, 1% CH4
  • Calibration and Alignment
  • ongoing
cherenkov
Cherenkov
  • 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 sonar
  • techniques (acoustic wave phase shift) <1% precision.

Thresholds:

tof wall
TOF Wall
  • Calibration:
    • Laser
    • Cosmic Rays
    • Pulse Calibration

pions

protons

Example:

time separation

and resolution

for 3 GeV/c

beam particles.

calorimeter
Calorimeter
  • 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.
prospects
Prospects
  • 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.