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Silica Aerogel Cherenkov Counters for the Isotope Matter-Antimatter Experiment

Labrador, A. W. and Mewaldt, R. A. and Schindler, S. M. and Stone, E. C. and Barbier, L. M. and Christian, E. R. and Mitchell, J. W. and Streitmatter, R. E. and Stochaj, S.J. and Rasmussen, I. L. (1993) Silica Aerogel Cherenkov Counters for the Isotope Matter-Antimatter Experiment. In: 23rd International Cosmic Ray Conference. University of Calgary , Calgary, Canada, pp. 524-527.

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We describe the design, development, and performance of the large area aerogel Cherenkov counters employed in the Isotope Matter-Antimatter Experiment (IMAX), a balloon-borne, magnet spectrometer. IMAX incorporated two Cherenkov counters containing silica aerogels of refractive index n=1.055 for velocity measurement and electron/muon background rejection. We describe aerogel baking techniques which were found to improve measured light output from 30% to more than 100% for individual aerogel blocks, as well as mounting techniques that preserved the integrity of the aerogel radiators during shipping, balloon flight, and parachute landing. The instrument flew successfully from Lynn Lake, Manitoba, Canada, on 16 July 1992, remaining at float for ~16 hours. Laboratory measurements and analysis of pre-flight data on the counters' performance are presented.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Labrador, A. W.0000-0001-9178-5349
Mewaldt, R. A.0000-0003-2178-9111
Stone, E. C.0000-0002-2010-5462
Christian, E. R.0000-0003-2134-3937
Additional Information:© 1993 University of Calgary. We thank Bob Golden and the NMSU-BBMF crew for providing overall payload support. Glen Albritton and Caltech's Central Engineering Service were instrumental in the construction of the counters. This research was supported in part by NASA grant NAGW-1919. One of us (AWL) thanks the NASA Graduate Student Researchers Program tor its support.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
NASA Graduate Student Researchers ProgramUNSPECIFIED
Record Number:CaltechAUTHORS:20140212-101632365
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43794
Deposited By: Tony Diaz
Deposited On:24 Feb 2014 23:57
Last Modified:09 Mar 2020 13:18

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