Jun 13 – 15, 2012
LAL Orsay
Europe/Paris timezone

Study of photocathode aging in MCP PMT

Jun 14, 2012, 3:30 PM
40m
Hall (LAL Orsay)

Hall

LAL Orsay

Poster Posters B

Speaker

Mr Mikhail Barnyakov (Budker Institute of Nuclear Physics)

Description

Photomultiplier tubes (PMT) based on microchannel plates (MCP) found a number of applications in colliding beam experiments at Budker Institute of Nuclear Physics (Novosibirsk, Russia). We report on the degradation of MCP PMT main characteristics after 8 years of operation in the threshold Cherenkov ASHIPH counters of the KEDR experiment at e+e- collider VEPP-4M. The photocathode aging in MCP PMT is systematically studied with the view of possible applications of such PMTs in future HEP experiments. The comparison of different types of alkali-antimonide photocathodes has shown that the treatment of photocathode with vapors of cesium and antimony can dramatically reduce the photocathode aging rate. The photocathode lifetime of the best MCP PMT sample has been measured at the photon counting rate of 10 MHz/cm^2 and the initial gain of 10^6. The peak quantum efficiency degraded by 20% after accumulation of 3.3 C/cm^2 anode charge.

Primary author

Mr Mikhail Barnyakov (Budker Institute of Nuclear Physics)

Co-authors

Mr Alexander Barnyakov (Budker Institute for Nuclear Physics) Mr Alexey Buzykaev (Budker Institute of Nuclear Physics) Prof. Alexey Onuchin (Budker Institute of Nuclear Physics) Dr Evgeniy Kravchenko (Budker Institute of Nuclear Physics) Mr Sergey Kononov (Budker Institute of Nuclear Physics) Mr Victor Bobrovnikov (Budker Institute of Nuclear Physics) Mr Vladimir Rodiakin (Budker Institute of Nuclear Physics)

Presentation materials