Journal of Astronomy and Space Sciences (Dec 2001)

Manufacturing and Test Results of Off-Axis Parabolic Cylinder Mirror for FIMS

  • K.-S. Ryu,
  • I.-S. Yuk,
  • K.-I. Seon,
  • Y.-W. Lee,
  • U.-W. Nam,
  • J.-H. Shin,
  • S.-J. Hong,
  • D.-H. Lee,
  • H. Jin,
  • S.-H. Oh,
  • J.-G. Rhee,
  • K.-W, Min,
  • W. Han,
  • J.-H. Park,
  • J. Edelstein,
  • E. J. Korpela

Journal volume & issue
Vol. 18, no. 3
pp. 239 – 248

Abstract

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Far-ultraviolet IMaging Spectrograph (FIMS) is the main payload of the first Korean scientific satellite, KAISTSAT-4, which will be launched in 2002. Among the optical parts, parabolic cylinder mirror does not have any heritage from previous astronomical missions, so the manufacturing and testing process itself is a challenging issue. We describe the method of manufacturing and measuring of the off-axis parabolic cylinder mirror and our initial experiments to establish the entire manufacturing process. Using the method, the profile error can meet the specification of ~λ per cm which is closely related with the astronomical performances. In case of the surface roughness, temperature controlled pitch polishing reduces Rq under 1 nm implying that scattering in the entire spectral range of FIMS is less than 2% of the incident UV light.

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