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Refractive index inhomogeneity within an aerogel block

Abstract : Evaluating local inhomogeneities of the refractive index inside aerogel blocks to be used as Cherenkov radiator is important for a high energy physics experiment where angular resolution is crucial. Two approaches are described and compared. The first one is based on the bending of a laser beam induced by refractive index gradients along directions normal to the unperturbed optical path. The second method exploits the Cherenkov effect itself by shooting an ultra-relativistic collimated electron beam through different points of the aerogel surface. Local refractive index variations result in sizable differences in the Cherenkov photons distribution.
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http://hal.in2p3.fr/in2p3-00025421
Contributor : Dominique Girod <>
Submitted on : Tuesday, January 17, 2006 - 3:32:21 PM
Last modification on : Thursday, January 18, 2018 - 1:48:25 AM

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T. Bellunato, M. Calvi, C.F. da Silva Costa, C. Matteuzzi, M. Musy, et al.. Refractive index inhomogeneity within an aerogel block. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Elsevier, 2006, 556, pp.140-145. ⟨10.1016/j.nima.2005.10.070⟩. ⟨in2p3-00025421⟩

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