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24 February 2003 A compact high-throughput imaging EUV/FUV spectrometer
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We present the optical design and predicted performance of the Extreme Ultraviolet Spectrometer (EUVS) developed for the Jupiter Magnetospheric Explorer (JMEX) mission. JMEX was proposed as small explorer (SMEX) mission designed to observe the Jovian system to study the dynamical relationship between Jupiter's magnetosphere and Io, the primary source of material for the Io plasma torus. NASA selected JMEX as one of six SMEX missions for detailed technical study. While JMEX was ultimately not selected for flight, the EUVS instrument design has a unique set of performance characteristics that may be useful for other applications, such as a multi-object spectrometer, a push-broom spectrometer for diffuse objects, or an imaging spectrometer with high spatial resolution. The EUVS is an imaging spectrograph originally designed to observe the Io plasma torus. EUVS provides moderate resolution (~0.1 nm) spectra between 64 to 114 nm over +/- 260" with 2" spatial resolution. The optical design is based on an off-axis Gregorian telescope, where the secondary mirror is replaced with an aberration-corrected holographic grating. The grating diffracts and focuses the UV light onto a cross-delay line microchannel plate detector with a potassium bromide photocathode. The primary mirror and grating are coated with boron carbide to maximize the normal incidence reflectivity at the shortest wavelengths. This high throughput, two-element design provides a compact instrument suitable for a small spacecraft while maintaining an efficient optical path that provides 7-12 cm2 of effective area.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Erik Wilkinson, Nicholas M. Schneider, Stephen R. Steg, James C. Westfall, Bret P. Lamprecht, John Paul Andrews, Oswald H. W. Siegmund, and Matthew N. Beasley "A compact high-throughput imaging EUV/FUV spectrometer", Proc. SPIE 4854, Future EUV/UV and Visible Space Astrophysics Missions and Instrumentation, (24 February 2003);

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