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A 10 MHz beam counter and a multiplicity detector for the E864 spectrometer

P. Haridas, I. A. Pless, G. Van Buren, J. Tomasi, M. S. Z. Rabin, K. Barish, R. D. Majka

physics.ins-detarXiv:physics/9801033

Abstract

The E864 experiment at BNL requires a beam counter and multiplicity detector system that can perform at an incident beam rate of 107 Au ions per second. We have developed and tested a 150 micrometer thick quartz Cherenkov beam counter and a scintillator based multiplicity-trigger counter during the first run of this experiment in 1994. We obtained a time resolution of 78 ps for the beam counter at an incident beam rate 5 x 105 Hz and 100 ps at a rate of 1 x 107 Hz. Pulse height discrimination is used to obtain a minimum bias and a 10% centrality trigger from the multiplicity detectors. The multiplicity counter has a time resolution of 250 ps.

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