Investigation of Cherenkov Light Scattering and Refraction on Aerogel Surface
9th International Workshop on Ring Imaging Cherenkov Detectors (RICH 2016)
05-09 Sep 2016
|| Barnyakov Aleksandr Yurʹevich
, Kononov Sergey Anatolʹevich
, Kuyanov I. A.
, Ovtin I. V.
, Bobrovnikov Viktor Sergeevich
, Barnyakov Mikhail Yurievich
, Podgornov Egor Alekseevich
, Danilyuk Alexandr Fedorovich
, Korda D. V.
, Buzykaev Alexey
, Kirilenko P. S.
, Katcin Aleksandr A.
, Onuchin Aleksei Pavlovich
, Kravchenko E. A.
Boreskov Institute of Catalysis SB RAS
Novosibirsk State University
Budker Institute of Nuclear Physics SB RAS
The work is devoted to the development of aerogel radiators for RICH detectors. The aerogel tiles
with refractive index 1.05 and thickness of 30 mm were tested with RICH prototype on electrons
beam at VEPP-4M collider.
The tile with cracks inside has been investigated. The experimental data show that the Cherenkov
angle resolution for tracks in the crack area and for tracks in the normal area are the same.
Several tiles with polished surface were tested with RICH prototype. Earlier It was shown that
polishing with silk tissue gives good surface quality, the amount of light lost at this surface is about
5-7%. The Cherenkov angle resolution was measured for the tile in two positions – clean outflow face
and polished outflow face. The number of detected photons are 11.5 for clean and 11.1 for polished
surfaces. The Cherenkov angle resolution for polished surface is 30% worse. This points to forward
scattering on the polished surface
These results are important for the development of aerogel radiators for RICH detectors.