SciBar Detector for K2K

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SciBar Detector for K2K

• F.Sánchez
• Universitat Autònoma de Barcelona / IFAE

K2K european collaborator meeting, 12 December
2002
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Actual K2K near detector configuration

• The K2K near detector is in charge of computing
  the neutrino flux normalization.
• Same water target and technique to reduce the
  systematics from near to far neutrino detection
• This would be possible only with a detector
  equivalent to SK in size m momentum from range.
• Additional detectors to study the QE interactions
  for spectrum analysis of the oscillations
• Understand QE/non-QE CC cross-sections and
  topologies (sampling calorimeter).
• compensates the smaller size of the SK-like
  detector (muon chambers).

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Actual K2K near detector configuration
m Chambers measurement of m momentum from u
range including LG and SCIFI.
Lead Glass electron for ne background studies.
SCIFI/Water sampling detector Mainly devoted for
detecting QE neutrino interaction (proton with p
gt 600 MeV).
1kton water Cherenkov a la Superkamiokande
for absolute flux normalization. Same target
(H20) and same detection technique. Low
efficiency for m above 1.5 GeV.
Increase efficiency for m above 1.5 GeV
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New K2K near detector configuration
SciBar
New detector will replace Lead Glass and will
reduce the threshold for protons.
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New SciBar detector

• Full Active
• Large volumen 300x300x160 cm3 15 tons
• Fine segmentation 2.5 x 1.3 cm2

X-Y views

• Particle Id
• proton ? dE/dx
• muon/pion ? range
• Mometum from range and dE/dx.

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New SciBar detector

• Scintillator
• 2.5x1.3x300 cm3
• Wave length shifting fiber Kurare Y11
• 1.5mm x 360cm
• attenuation length 342 cm
• Photon collection uniformity 5
• Light yield 20p.e./cm after 50cm fiber

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Multi-anode PMT
(measured by 1mmf fiber)

• H8804 (HPK) (modified H7546)
• (8x8) multi-anode
• 2x2 mm2 pixel
• Cross talk lt 3 (1.5mmf fiber)
• Gain 5x105 _at_800V
• Non linearity 5 _at_300p.e.

1mm
-1mm
Hamamatsu H7546