Flight Performance of UV Filters on the ALEXIS Satellite

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The ALEXIS (Array of Low-Energy X-ray Imaging Sensors) mission, serving as the first dedicated all-sky monitor in the extreme UV, has been collecting data since its launch in 1993. ALEXIS operates in a 70{degree} inclination orbit at an altitude of 800 km. The ALEXIS science mission is to observe the cosmic UV background and to study variability of EUV sources. The ALEXIS experiment is composed of six telescopes. Although the telescopes were only designed for a one-year technology verification mission, they are still functioning with much the same effectiveness as at the beginning of the mission. The telescopes comprise: (1) ... continued below

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Bloch, J.J.; Roussel-Dupre, D. & Starin, S. July 8, 1999.

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The ALEXIS (Array of Low-Energy X-ray Imaging Sensors) mission, serving as the first dedicated all-sky monitor in the extreme UV, has been collecting data since its launch in 1993. ALEXIS operates in a 70{degree} inclination orbit at an altitude of 800 km. The ALEXIS science mission is to observe the cosmic UV background and to study variability of EUV sources. The ALEXIS experiment is composed of six telescopes. Although the telescopes were only designed for a one-year technology verification mission, they are still functioning with much the same effectiveness as at the beginning of the mission. The telescopes comprise: (1) layered synthetic microstructure (LSM) spherical mirrors, (2) thin foil filters, and (3) microchannel plate (MCP) detectors, all enshrouded within the telescope body. The LSM mirrors select the bandpass for each telescope, while rejecting some of the HeII 304{angstrom} geocoronal radiation. The filters, constructed either from aluminum/carbon or Lexan/titanium/boron, serve to strongly reject the geocoronal radiation, as well as longer wavelength emission from bright OB stars. Each telescope detector consists of two plates, the outermost of which is curved to accurately match the spherical focal surface of the mirror. By reviewing the ground and flight histories, this paper analyzes the flight performance of the filters, including the effects of long term exposure and the formation of pinholes.

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OSTI as DE00758957

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  • SPIE Conference Proceedings, No location supplied, No date supplied

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  • Report No.: LA-UR-99-3100
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 758957
  • Archival Resource Key: ark:/67531/metadc707438

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  • July 8, 1999

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  • Sept. 12, 2015, 6:31 a.m.

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  • May 6, 2016, 1:23 p.m.

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Bloch, J.J.; Roussel-Dupre, D. & Starin, S. Flight Performance of UV Filters on the ALEXIS Satellite, article, July 8, 1999; New Mexico. (digital.library.unt.edu/ark:/67531/metadc707438/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.