Performance characteristics of high-conductivity channel electron multipliers.
A new type of channel electron multiplier (CEM) has been developed which utilizes a high-conductivity glass to provide a very high count -rate capability. A linear response to count rates in excess of 2x10(6) count s(-1) has been demonstrated with no measureable change in the detection efficiency at total accumulated signal levels of greater than 2x10(11) counts. The measured loss of gain at 2x10(11) accumulated counts was less than 20%. The cathode configuration of the CEM is optimized for maximum sensitivity at xuv wavelengths and detection efficiencies greater than 20% have been obtained using opaque MgF(2) cathodes at wavelengths between about 150 and 800 A.
Timothy
J G
JG
Harvard-Smithsonian, Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138Ball Brothers Research Corporation, Boulder, Colorado 80306.
Bybee
R L
RL