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
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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