HARP Progress Report

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HARP Progress Report
V. Palladino Commissione II INFN Roma 16/9/2003
124 people
24 institutes
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Attivita dellultimo anno del gruppo Harp

• Data taking concluso con successo (Nov 2002)
• Calibrazione e allineamento conclusa per
• beam defining
  detectors
• forward
  spectrometer (piccolo angolo)
  
• Calibrazioni e correzioni TPC a buon punto
• post
  data taking completato
• analisi in
  corso
• Detector paper in preparation
• Software tools per lanalisi in stato avanzato
• Physics performance del forward spectrometer
  adeguate a far partire le prime analisi .
• Large Angle Physics a seguire
• un cospicuo numero di
  pubblicazioni nel 2004

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26 Agosto 2003
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dalle minute dello SPSC .. STATUS OF
PS214/HARP The referee explained the progress in
the alignment and calibration of the detector.
The small angle spectrometer is essentially
aligned and calibrated. Physics analysis can
start soon and the expected results should
greatly improve the impact of the K2K and
MiniBooNE experiments. Close collaboration has
been established with these two groups. For
the large angle region, work is concentrated on
the understanding of the TPC. Substantial
improvements have already been achieved in the
corrections of several TPC distortions. Further
work on the reconstruction software is needed.
The referee would like to see an enlargement of
the analysis group. The Committee acknowledged
the good progress made in the understanding of
the subdetector perfor mance. The Committee is
concerned about the size of the analysis team
and, through its referee, will follow carefully
progress in forthcoming months. The Committee
supported the Collaboration in the choice of the
analysis strategy, and urged the Collaboration
to publish results as soon as possible in view of
their importance for neutrino physics results.
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Satisfactory progress in a very challenging job
of data reduction, processing analysis
Particolarmente perche
alla fine di alcuni mesi difficili conclusisi
in luglio con un cambio di direzione Dydak
(Panman vice) Panman (Catanesi vice)
attraverso un voto che ha diviso e la
collaborazione e il gruppo INFN storia
vecchia ormai speriamo tutti ..
speriamo cioe di fugare le
inevitabili perplessita tra i nostri Questo
giudizio dello SPSC mi conforta . . che ci
possan essere le basi per portare a termine
il previsto vasto incisivo hadroproduction
survey per
esperimenti in corso con atmospheric (SuperK)
ns
beam (K2K,
MiniBoone) ns
futuri Superbeams e Neutrino Factories

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Data taking

• Il programma e stato completato con successo
• Nonostante le condizioni non ottimali del fascio
  nel 2002 le high performance del DAQ system (94)
  responsabilita del gruppo di Bari hanno permesso
  di raccogliere la statistica sufficente

50 Tbytes of data
420 million events
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Beam detectors
MWPCs
TOF-B
TOF-A
T9 beam line normalmente usata per test-beams
CKOV-A
CKOV-B
T9 beam
21.4 m
Necessita beam detectors precisi
Beam cherenkov
MWPCs
Beam Tof

• Beam tracking
• 96 tracking eff using 3 out of 4 chambers
• lt100 mm resolution

• e id at low energy
• p id at high energy
• K id above 12 GeV
• 100 eff in e-p tagging

• p/k/p separation at low energies (5 GeV)
• 170 ps resolution

12.9 GeV
3 GeV
p
p
d
k
extrap to target
Corrected TOF (ps)
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TPC (Ba-LNL-Ts)

• Tracking device for large angle region (above
  100 mrads)
• Le Calibrazioni con X-ray sources e cosmic rays
  sono state effetuate
• La Full reconstruction chain estata realizzata
• I problemi emersi dallo studio dei dati sono
  stati compresi
• Inhomogeneous E and B field effects
• Cross-talk
• Variable distortions (charging, beam, dead pads
  effects,)
• Gli algoritmi di correzione per tutte le
  distorsioni sono in progress
• La risoluzione in impulso senza correzioni e fra
  il 20 e il 40 nella regione di interesse.
• Si punta a migliorare
  
• di un fattore
  2.

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TPC-Calibrations
Krypton/cosmics (periodically)
post data-taking
Gennaio-marzo 2003
Individual pulse injection in all 3972 pads

• Measure preamp linearity
• Measure x-talk couplings

• 83Kr gas injected.
• Homogeneous illumination of the TPC.
• Used for
• Channel equalization, cross checked with cosmic
  rays (5)
• Energy calibration

Aprile Giugno spostamento area sperimentale
Da luglio fino a ieri

• Measure linearity of energy response
• Compare the equalization factors for low-high
  energy

55Fe and 83Kr X-ray sources
Few pads with similar gains
Large number of pads
Fe peaks
Kr peaks
14 energy resolution (without any correction)
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Drift Chambers
Cosmic rays

• Reused from NOMAD
• Tracking device for low angle region (lt300 mrads)
• Alignment with cosmic and beam muons. Corrections
  on
• Wire positions
• Wire time pedestal (t0)
• Drift velocities per plane
• Plane efficiency studies also with cosmic rays
  and muons

Iter 1
Alignment
Iter 2
plane efficiency
eff80

• In NOMAD was gt95
• Due to the use of a different gas (non flammable)

lateral modules
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Drift chamber Reconstruction
plane segment strategy
efficiency ()
triplet strategy
planes
0o
-5o
5o
hit
beam
chamber
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Cherenkov (TS)
Pmt plane
mirror
beam
mirror

• 31 m3 filled with C4F10 (n1.0014)
• LED flashing system for calibration

Pmt plane

• 80 light collection eff
• 2.6 GeV threshold for pions

2.6 GeV
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Tof Wall (MI-PD)

• Cosmic ray calibration (every 2-3 months)
• Measure the relative time-offset between
  photomultipliers
• Laser calibration (continuous)
• TOF wall stability check
• Good agreement with cosmic ray calibration

Performance
7s separation at 3GeV
70 ps
3s separation p/p Elt 4.5GeV p/k Elt
2.4GeV
cosmics
pions
protons
laser
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Electron identifierRoma I III

• Reused from Chorus
• 2 planes (EM1, EM2)
• Serves for
• e/p separation
• p0 id (iron photon converter)
• Calibration with cosmic rays

Spread of electron beam at the entrance of the
spectrometer
Chorus resolution Full T9 beam and SPEC
description
--- Chorus
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Software Status in progress ma gia operazionale

• Analysis package
• Exportable DSTs
• Software running locally (in external institutes
  and on laptops)
• Reconstruction package
• Track fitting, track/measurement matching and
  merging, track length computation, propagation to
  any surface
• Handles multiple scattering and inhomogeneous
  magnetic fields
• Vertex fit almost ready
• GEANT4 simulation
• Detector description for simulation,
  reconstruction and event display
• Response of all sub-detectors (and TPC modelling)
• T9 beam simulation
• Migration from Objectivity to Oracle completed
• Interface software almost ready (done)

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Matching between subdetectors

• Global alignment (done)
• PID association to reconstructed tracks (in
  progress)
• Combined tracking (in progress)

Tracking devices
NDC-TPC
NDC-MWPCs
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Forward PID detectors
CKOV
NDC1 MAG NDC2 NDC5 TOF
MUONID
ECAL
x(mm)
NDC-TOF Wall
z(mm)
NDC-Electron id
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Prospects on physics analysis
K2K example

• Forward and beam detectors are already functional
  for analysis
• Calibrated and aligned
• High PID performance
• Efficient track reconstruction
• Monte Carlo available
• We have selected strong physics cases within our
  reach and of our immediate interest
• The forward analysis is of immediate interest to
  the K2K and MiniBooNE experiments

oscillation peak
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Attivita dellultimo anno del gruppo Harp

• Data taking concluso con successo (Nov 2002)
• Calibrazione e allineamento conclusa per
• beam defining
  detectors
• forward
  spectrometer (piccolo angolo)
  
• Calibrazioni e correzioni TPC a buon punto
• post
  data taking completato
• analisi in
  corso
• Detector paper in preparation
• Software tools per lanalisi in stato avanzato
• Physics performance del forward spectrometer
  adeguate a far partire le prime analisi .
• Large Angle Physics a seguire
• un cospicuo numero di
  pubblicazioni nel 2004

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Richieste finanziarie 2004 vedi tabelle
referees 2003 1) missioni interne
approvate a giugno
(11.5 KE, vedi dettaglio) ma non assegnate!
2) Common Fund 2003 approvato a settembre
ma mai
assegnate sulle DOT/NA !
ho ormai la fattura (61.9 KSF.. 35-40 KE)
a
mio nome !!!!! .
da pagare !!!!..
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1 KEuros missioni interne BA !
LNL
2 KE FE
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()              HARP-Missioni Interne 2003
raccomandate ma non
assegnate per disguido
dopo la Commissione II
di giugno    BA             4    
FE              0      LNL           2
    MI              0    
NA             1     PD              2
    RomaI        0     
RomaIII      0     TS              2,5  
---------------------    
Totale         11,5
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The HARP experiment
24 institutes
124 people
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Progress Report HARP
Status- Datataking finished end 2002
2003 Progress on understanding calibrations

of subdetectors
Detector paper in
preparation
and on software tools
. making physics
possible Prospects Small angle forward physics
coming soon
few months timescale Large
angle physics to follow . Aiming at large
physics output in 2004



V. Palladino Commissione II INFN Roma 16/9/2003
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