The photon detector of the HERMES dual-radiator RICH

Details The photon detector of the HERMES dual-radiator RICH The photon detector of the HERMES dual-radiator RICH

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999nimpa.433..168a&link_type=abstract

Nuclear Instruments and Methods in Physics Research Section A, Volume 433, Issue 1-2, p. 168-171.

Physics

2

Scientific paper

To provide hadron identification over the full kinematic range (2-20GeV) of the HERMES experiment, the gas threshold Cherenkov counters were replaced by a dual-radiator ring-imaging Cherenkov detectors incorporating for the first time aerogel (SiO2) and C4F10 gas as radiator materials. This combination of radiators requires a photon detector that is sensitive over wavelengths from ultraviolet to 700nm. Commercially available `3/4 in.' photo-multipliers were chosen to form an array of 2000 for each of two photon-detectors. Exhaustive calibration and sorting of the phototubes prior to installation resulted in very low noise hit rates in the LeCroy PCOS4 readout system, with a uniform effective threshold of 0.1 photo-electrons.

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