Abstract
Abstract A large-area fast-timing detector (effective area of 1380 mm2) especially suited for use as a stop detector has been developed. Secondary electrons from a thin foil are accelerated in an electric field and then deflected by 90° onto a microchannel plate using an electrostatic mirror. The detection efficiency for 5.5 MeV α-particles was found to be 91%. An intrinsic time resolution (FWHM) of 60 ps for 85 MeV 16O ions (due to the transit time spread of secondary electrons between the foil and the microchannel plate) was obtained.
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