Large-Area Scintillator Hodoscope with 50 ps Timing Resolution Onboard BESS

Abstract

We describe the design and performance of a large-area scintillator hodoscope onboard the BESS rigidity spectrometer; an instrument with an acceptance of 0.3 m^{2}sr. The hodoscope is configured such that 10 and 12 counters are respectively situated in upper and lower layers. Each counter is viewed from its ends by 2.5 inch fine-mesh photomultiplier tubes placed in a stray magnetic field of 0.2 Tesla. Various beam-test data are presented. Use of cosmic-ray muons at ground-level confirmed 50 ps timing resolution for each layer, giving an overall time-of-flight resolution of 70 ps rms using a pure Gaussian resolution function. Comparison with previous measurements on a similar scintillator hodoscope indicates good agreement with the scaling law that timing resolution is proportional to 1/$\sqrt{N_{\mathrm{pe}}}$, where $N_{\mathrm{pe}}$ is the effective number of photoelectrons.

arXiv comment16 pages, 14 figures

References in corpus (7)

• Precision Measurement of Cosmic-Ray Antiproton Spectrum
• Local Flux of Low-Energy Antiprotons from Evaporating Primordial Black Holes
• Measurement of Low-Energy Cosmic-Ray Antiprotons at Solar Minimum
• Expected Enhancement of the Primary Antiproton Flux at the Solar Minimum
• Development of a Large-Area Aerogel Cherenkov Counter Onboard BESS
• Feasibility Study of Single-Photon Counting Using a Fine-mesh Phototube for an Aerogel Readout
• Monte-Carlo Simulation for an Aerogel Cherenkov Counter

Cited by in corpus (14)

• The design of the MEG II experiment
• Measurements of Primary and Atmospheric Cosmic-Ray Spectra with the BESS-TeV Spectrometer
• Test of a single module of the J-PET scanner based on plastic scintillators
• Measurements of 0.2 to 20 GeV/n cosmic-ray proton and helium spectra from 1997 through 2002 with the BESS spectrometer
• Measurements of Cosmic-ray Low-energy Antiproton and Proton Spectra in a Transient Period of the Solar Field Reversal
• Successive Measurements of Cosmic-Ray Antiproton Spectrum in a Positive Phase of the Solar Cycle
• Search for Cosmic-Ray Antideuterons
• Precise Measurements of Atmospheric Muon Fluxes with the BESS Spectrometer
• Measurements of Proton, Helium and Muon Spectra at Small Atmospheric Depths with the BESS Spectrometer
• Measurements of atmospheric muon spectra at mountain altitude
• Measurement of Cosmic-Ray Proton and Antiproton Spectra at Mountain Altitude
• Time resolution of time-of-flight detector based on multiple scintillation counters readout by SiPMs
• Measurement of low-energy antiproton detection efficiency in BESS below 1 GeV
• Measurements of Atmospheric Antiprotons