Abstract
A preconditioning process encompassed vacuum baking and burn-in with ultraviolet radiation.An equipment of preconditioning of microchannel plate was designed which could provide vacuum environment(10-5 Pa at least) as well as heating elements.The heating elements were controlled to reach 350℃ and then the vacuum chamber was sustained 350℃ for 18 hours in the procedure of bake-out.The burn-in procedure illuminating with ultraviolet radiation(253.7 nm) from a deuterium lamp was achieved when 0.06 Coulomb cm-2 was extracted from the MCP stack output.After the preconditioning the image spatial resolution reached to 125 μm,the background events rate dropped to be 0.53 counts/s·cm2 from 27.09 counts/s·cm2,the pluse height distribution curve closed to Gauss distribution and turned to be more narrow.
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