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arXiv · hep-ex/0002047

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
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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/$\sqrt{N_{\rm pe}}$, where $N_{\rm pe}$ is the effective number of photoelectrons.

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Y. Shikaze, S. Orito, T. Mitsui, K. Yoshimura, H. Matsumoto, H. Matsunaga, M. Nozaki, T. Sonoda, I. Ueda, T. Yoshida. 2000-02-17. Large-Area Scintillator Hodoscope with 50 ps Timing Resolution Onboard BESS. https://doi.org/10.1016/s0168-9002(00)00571-4

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