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

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

2000-02-17

arxiv.org/abs/hep-ex/0002047v1

Nucl.Instrum.Meth. A455 (2000) 596-606

Physics

High Energy Physics

High Energy Physics - Experiment

16 pages, 14 figures

Scientific paper

10.1016/S0168-9002(00)00571-4

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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