Normal Incidence Multilayer Telescope for Galactic EUV Observation

摘要

We developed normal incidence multilayer telescopes for observing EUV radiation from celestial objects. A telescope consists of spherical mirror coated with Mo/Si multilayer and a position sensitive detector made of microchannel plate on the focal plane. Three kinds of multilayers were deposited on three mirrors, which are optimized for observations of 130-140A, 170-180A and 270-330A, respectively. The characteristics of these telescopes were measured by using monochromatized synchrotron radiation. The peak reflectivity of multilayered mirrors was obtained to be nearly 60% at the peak wavelength of 133A and 172A and 10% at 300A at the normal incidence, as expected. The quantum efficiency of MCP detector was 20% in the wave-band 100-200A. These telescopes were on board a sounding rocket, S-520-19 to observe EUV emission from HZ43, a hot white dwarf, and galactic hot plasma.