A promising large area VHE gamma ray detector with excellent hadron rejection capability

Details A promising large area VHE gamma ray detector with excellent hadron rejection capability A promising large area VHE gamma ray detector with excellent hadron rejection capability

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nuphs..14..351t&link_type=abstract

Nuclear Physics B Proceedings Supplements, Volume 14, Issue 1, p. 351-355.

Physics

Nuclear Physics

8

Scientific paper

A new large area VHE gamma ray detector for detecting atmospheric Cerenkov light from very high energy celestial gamma rays is proposed. It will be constructed by converting Solar One, a 10 MW Solar Thermal Central Receiver Pilot Plant at Barstow, California, which uses the solar tower technology with heliostats as light collectors. Solar energy research at this facility has recently been terminated. The detector will cover an area of at least 200 m diameter, which is only about 5% of the total area available at Solar One, so that a significant fraction of the Cerenkov light pool is detected. Each heliostat will focus the Cerenkov light onto a photomultiplier tube (PMT) selected to match the optical quality of the heliostat. Its active reflecting surface is 71,000 m2, which is about 375 times larger than the largest VHE gamma ray atmospheric Cerenkov detector, the twin 11 m dia. collectors at Sandia Labs, Albuquerque1. It is expected to have the lowest energy threshold (>=10 GeV) for atmospheric Cerenkov observations. This will enhance counting rates significantly and bridge the gap between HE and VHE gamma ray astronomy with some overlapping. It will also have excellent inherent hadron rejection. One hundred million dollars worth of installation is already constructed and ready to use. The rest of the detector can be built for a small fraction, <1%.

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