Submicron entrance windows for an ultrasoft X-ray camera

Computer Science – Performance

Scientific paper

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Lexan (Trademark), Proportional Counters, Ultraviolet Astronomy, Windows (Apertures), X Ray Astronomy, X Ray Imagery, Cosmic Plasma, Galactic Radiation, Performance Tests, Plasma Radiation, Polymeric Films, Supernova Remnants, Thick Films

Scientific paper

During the development of an imaging proportional counter suited for observing celestial objects in the XUV waveband (10-250 A), the feasibility of producing a reliable plastic entrance window having a thickness equal to or less than 0.3 microns and good uniformity over an area of several tens of square centimeters was investigated. After evaluating several candidate materials and production techniques, film casting of pure Lexan was selected as an appropriate technique for providing strong 65 mm diameter, 0.3-micron thick windows having low gas diffusion leakage (less than 0.0003 bar cu cm/s sq cm) and adequate opaqueness for short wavelength UV radiation. A prototype XUV camera equipped with such a window was used to make a picture of a multipinhole mask irradiated by the emission line spectrum of ionized He (243, 256, and 304 A). This gave very satisfactory performance.

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