Abstract
The LAPPD Collaboration was formed to develop ultrafast large-area imaging photodetectors based on new methods for fabricating microchannel plates (MCPs). In this paper we characterize the time response using a pulsed, sub-picosecond laser. We observe single-photoelectron time resolutions of a 20cm × 20cm MCP consistently below 70ps, spatial resolutions of roughly 500μm, and median gains higher than 107. The RMS measured at one particular point on an LAPPD detector is 58ps, with ± 1σ of 47ps. The differential time resolution between the signal reaching the two ends of the delay line anode is measured to be 5.1ps for large signals, with an asymptotic limit falling below 2ps as noise-over-signal approaches zero.
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