Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume 595, Issue 1, Pages 183-186Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nima.2008.07.072
Keywords
Cherenkov detectors; Silica aerogel
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Two methods for the measurement of the uniformity of the refractive index n within a single block of silica aerogel are described. One is based on the deflection of a laser beam induced by transverse index gradients. The second exploits the Cherenkov effect, measuring the emission angle of photons radiated by 500MeV electrons traversing the aerogel. The beam can scan the full aerogel surface providing information on point to point variations of n. The measurement of the dispersion law n(lambda) is also reported. An Xe lamp coupled to a diffraction grating provides the monochromatic source. The index for each lambda is measured by the prism method at a corner of an aerogel sample. A Sellmeier functional form for n(lambda) is assumed, and the parameters best fitting the experimental data are given. (C) 2008 Elsevier B.V. All rights reserved.
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