Spatial resolution and relative brightness of a microchannel plate detector system with P20 and P43 phosphor screens
Authors:
- 1 June 2011
- journal article
- Published by SPIE-Intl Soc Optical Eng in Optical Engineering
- Vol. 50 (6) , 064001-064001-6
Abstract
A detector consisting of two biased microchannel plates and a P20 or P43 phosphor screen was illuminated with 500-eV electrons in order to characterize the size and amplitude of individual microchannel plate (MCP) firings as a function of phosphor-to-MCP distance d and voltage Vacc. The P43 phosphor was significantly brighter (71%) than P20 at Vacc = 4250 V, and brighter but less so (4%) at Vacc = 8000 V. Events were Gaussian-shaped with full widths at half maximum of order 0.27 mm for Vacc = 4250 V and d = 2 mm. Widths decreased by 23% to 28% when Vacc was increased to 8000 V, and increased between 9 to 34% when doubling d, depending on Vacc and phosphor type.Keywords
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