Normal incidence multilayer telescope for Galactic EUV observation.

Astronomy and Astrophysics – Astronomy

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Extreme Uv Astronomy: Telescopes, Rocket-Borne: Uv Telescopes, Extreme Uv: White Dwarfs

Scientific paper

The authors have developed normal incidence multilayer telescopes for observing EUV radiation from celestial objects. The telescope consists of a spherical mirror coated with Mo/Si multilayer and a position sensitive detector made from a microchannel plate on the focal plane. Three kinds of multilayers were deposited on three mirrors, which are optimized for observations of 130 - 140 Å, 170 - 180 Å and 270 - 330 Å, 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 133 Å and 172 Å and 10% at 300 Å at the normal incidence, as expected. The quantum efficiency of MCP detector was 20% in the wave-band 100 - 200 Å. These telescopes were on board a sounding rocket to observe EUV emission from HZ 43, a hot white dwarf, and Galactic hot plasma.

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