Authors: Simeonov, L.I.
Reference: Proc.of the 5th Nat.Conf. with Intern.Part.on Contemporary
Problems of the Solar-Terrestrial Influences, Sofia, 79-81, 1998.
Abstract:
Presented are results of laboratory comparison tests of
microchannel plates from different suppliers, carried out for the
purposes of the secondary electron detectors of the sensor STOF
(Suprathermal Time-Of-Flight) of CELIAS spectrometric system on SOHO.
The principle criteria for the testing of microchannel plates are based
on different and even contradictory goals: maximum charge, maximum
current amplitude, high rise time, minimum pulse width/good pulse
separation, moderate supply voltage, maximum sensitivity, spatial
resolution, high count rate and long operational life. For long-term
space research applications the most important quality is the long
operational life and preservation of the signal amplification. The
laboratory experiments showed, that these particular quality differences
are possible to be outlined in a several-day life-time testing.