Test Beam for the NOvA near detector

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Test Beam for the NOvA near detector
http//www.fe.infn.it/cibinett/Physics/NOVA/

• G. Cibinetto
• infn - Ferrara

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Outlook

• NOvA test beam requirements
• Test beams at CERN
• The Frascati Test Beam Facility
• Test beams at DESY

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Neutrino energy spectrum
Energy spectrum depends on where will be located
the near detector
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Electrons/muons separation
Electrons and muons are well identified by
different behavior in the NOvA detector Electrons
tend to deposit more energy per plane and have
more hits per plane. Electrons have larger rms
spread of the hits. Muons tracks are rather
continuous.
e
e
Average number of hits per plane
Average pulse height/plane
m
m
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e/m separation
Low energy events
High energy events
Muons Electrons
Muons Electrons
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Near detector design

• 3 standard extrusions high (392.5 cm) by 2
  extrusions wide (261.5 cm)
• 192 planes (without muon catcher)
• With the present segmentation the electron energy
  resolution is 10

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Shower dimension
Most showers are not more than 80 cm wide
(average 10-40 cm).
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NOvA test beam requirements

• 1-5 GeV electrons
• sE/E of few
• Quite large experimental room

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Test Beams at CERN
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CERN test beam lines

• PS East Hall (Meyrin site, CH)
• 4 test beam lines (T7, T9, T10, T11), 1- 10, 15,
  7,3.5 GeV/c
• SPS West Area (Meyrin site, CH)
• 2 test beam lines (X5, X7), 5-250 GeV/c
• SPS North Area (Prevessin site, France)
• 4 test beam lines (H2, H4, H6, H8), 10 400
  GeV/c
• Irradiation facilities
• Gamma Irradiation Facility (GIF), SPS West Area
• Proton/neutron irradiation facilities, PS East
  Hall

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PS East Hall beams
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East Hall beams characteristics

• Momentum range
• min. 1 GeV/c
• max. 3.5 GeV/c (T11), 7 GeV/c (T10), 10 GeV/c
  (T7), 15 GeV/c (T9)
• Spill structure from PS
• 400 ms spill length, typical 2 spills every 16.8s
• Particle type and intensity
• Electrons (lower momenta), hadrons, muons
• Targets
• 10 different targets, T9/T10/T11 standard
  hadron target, electron enriched

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Support by CERN
All free of charge

• Basic installation support
• Electronic hut with beam control terminal
• Computer network connection
• Crane usage (with operator)
• Assistance for beam tuning and operation
• Provision of beam position monitors
• Provvision of threshold Cherenkov counters

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The Frascati Test Beam Facility

• BFT parameters
• Electrons energy 50-750 MeV
• Repetition rate up to 50 Hz
• Pulse duration 10 ns
• Maximum current/pulse 500 mA
• 100 m2 Experimental Hall

detector
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Test Beams _at_ DESY
DESY provides three test beam lines (21, 22 and
24). Up to 1000 particles per cm² and second,
energies from 1 to 6 GeV, an energy spread of 5
and a divergence of 2mrad.
21
22
24
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Beam Generation
A bremsstrahlung beam is generated by a carbon
fibre in the circulating beam of the
electron/positron synchrotron DESY II. The
photons are converted to electron/positron pairs
with a metal plate. Then the beam is spread out
into a horizontal fan with a dipole magnet. Like
a slice, the final beam is cut out of this fan
with a collimator
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DESY test beam hall
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Conclusions