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WUPPE was designed to obtain simultaneous spectra and polarization measurements from 1400 to 3300Å. WUPPE has a 0.5m f/10 classical Cassegrain telescope (area = 1,800 square centimeters, 279 square inches) and a spectropolarimeter, with a field of view of 3.3 by 4.4 arc-minutes and a resolution of 6 angstroms. The telescope feeds light to a low resolution spectrometer equipped with various polarimetric analyzers. The spectrometer is a modified Monk-Gilleson spectrometer: two rotating wheels are used to select the focal plane aperture and the polarimetric analyzer; a magnesium fluoride Wollaston polarizing beam-splitter placed between the aperture and the relay mirror splits the beam into two orthogonally-polarized spectra which fall on the detector. The detector consists of dual Reticon self-scanning linear arrays of 1024 pixel photodiodes (to detect both beams simultaneously) coupled by fiber optics to a microchannel plate intensifier with a cesium-telluride photocathode. A charge-coupled device camera is provided for target acquisition and for viewing the aperture during a measurement. The focal plane scale is 26 arcsec/mm and the dispersion is 78 Å/mm, blaze at 2000 Angstroms. A set of halfwave plates at 6 different angles provided spectropolarimetric modulation with 5 angstrom resolution on point sources through apertures from 6 to 40 arcsec. A "Lyot" analyzer was used to provide 50-100 angstrom spectropolarimetric resolution on faint point targets and diffuse nebulae.
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