Abstract
Abstract A position sensitive detector for 3–30 keV positrons and electrons has been developed which consists of a pair of microchannel plates (MCP) in Chevron configuration and resistive anode readout. The device has an active diameter of 75 mm and can be operated in axial magnetic fields up to several kG. The detection efficiency of MCP devices is 16(2)% for positrons in the 10 keV region. With a thin carbon (C) foil of 25 μg/cm 2 thickness carrying a 15 μg/cm 2 magnesium oxide (MgO) coating acting as additional secondary electron emitter, the efficiency could be increased to 64(2)% in the energy range 5–12 keV. A two-dimensional position resolution of 0.55(3) mm (FWHM) and a timing resolution of better than 1 ns could be achieved.
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