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Optical and Radiographical Characterization of Silica Aerogel for Cherenkov Radiator

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6 Author(s)
Tabata, M. ; Inst. of Space & Astronaut. Sci. (ISAS), Japan Aerosp. Exploration Agency (JAXA), Sagamihara, Japan ; Adachi, I. ; Hatakeyama, Y. ; Kawai, H.
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We present optical and X-ray radiographical characterization of silica aerogels with refractive index from 1.05 to 1.07 for a Cherenkov radiator. A novel pin-drying method enables us to produce highly transparent hydrophobic aerogels with high refractive index by shrinking wet-gels. In order to investigate the uniformity in the density (i.e., refractive index) of an individual aerogel monolith, we use the laser Fraunhofer method, an X-ray absorption technique, and Cherenkov imaging by a ring-imaging Cherenkov detector in a beam test. We observed an increase in density at the edge of the aerogel tiles, produced by pin-drying.

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Nuclear Science, IEEE Transactions on  (Volume:59 ,  Issue: 5 )