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Proceedings Paper

Ring imaging detector for cosmic-ray observations
Author(s): Don Ellithorpe; Edward Diehl; Dietrich Mueller; Simon P. Swordy
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Paper Abstract

The measurement of particle velocities in cosmic ray experiments has largely been made by counters which determine the total amount of Cherenkov light emitted by a radiator material. Here we discuss a far more accurate technique which measures the angle of emission of individual Cherenkov photons by imaging the emission cone onto a ring. This approach has the advantage of supplying a velocity estimate from each detected photon and a large reduction in the effects of background light. As an example, we shall discuss our ring imaging Cherenkov detector (RICH) for high altitude balloon cosmic ray experiments. This instrument combines a 3 m gas Cherenkov radiator with 1.5 m multiplied by 1.5 m of position sensitive photon detectors based on TMAE gas mixtures. The photon detector assembly detects individual photons with a quantum efficiency of 10 - 20% in the UV region of the spectrum. The use of VLSI electronics provides individual readout of 18,000 1 cm by 1 cm pixels. The future application of this technique in cosmic ray instruments also is discussed.

Paper Details

Date Published: 18 October 1996
PDF: 6 pages
Proc. SPIE 2806, Gamma-Ray and Cosmic-Ray Detectors, Techniques, and Missions, (18 October 1996); doi: 10.1117/12.253968
Show Author Affiliations
Don Ellithorpe, Univ. of Chicago (United States)
Edward Diehl, Univ. of Chicago (United States)
Dietrich Mueller, Univ. of Chicago (United States)
Simon P. Swordy, Univ. of Chicago (United States)

Published in SPIE Proceedings Vol. 2806:
Gamma-Ray and Cosmic-Ray Detectors, Techniques, and Missions
Brian D. Ramsey; Thomas A. Parnell, Editor(s)

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