Large-area scintillator hodoscope with 50 ps timing resolution onboard BESS

Y. Shikaze, S. Orito, T. Mitsui, K. Yoshimura, H. Matsumoto, H. Matsunaga, M. Nozaki, T. Sonoda, I. Ueda, T. Yoshida

Research output: Contribution to journalArticle

31 Citations (Scopus)

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 m2 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 in. fine-mesh photomultiplier tubes placed in a stray magnetic field of 0.2 T. 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/√Npc, where Npc is the effective number of photoelectrons.

Original languageEnglish
Pages (from-to)596-606
Number of pages11
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume455
Issue number3
DOIs
Publication statusPublished - Dec 11 2000
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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