27 November 1989 Long-Term Performance Characteristics Of The Detectors For The Extreme Ultraviolet Explorer
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We have examined the long term performance of two prototype microchannel plate (MCP) detectors built for the Extreme Ultraviolet Explorer mission. The detectors were subjected to an extended test sequence, encompassing preconditioning, evaluation of operating characteristics, and a period of extended operation with regular re-evaluations. Our results show that under vacuum storage conditions the MCP performance characteristics remain stable for several years, provided preconditioning has been performed. We also find that for extended periods of detector operation the MCP gain gradually declines. The extent of gain decline is found to be directly related to the level of charge extracted from the MCP's. The MCP intrinsic background event rate is also found to decrease with time under vacuum, and with increasing extracted charge. In part, the latter is related to a decrease in the activity of MCP hot spots.
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O. H. W. Siegmund, O. H. W. Siegmund, J. V. Vallerga, J. V. Vallerga, D. E. Everman, D. E. Everman, J. Hull, J. Hull, "Long-Term Performance Characteristics Of The Detectors For The Extreme Ultraviolet Explorer", Proc. SPIE 1140, X-Ray Instrumentation in Medicine and Biology, Plasma Physics, Astrophysics, and Synchrotron Radiation, (27 November 1989); doi: 10.1117/12.961810; https://doi.org/10.1117/12.961810


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