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Seon, K.-I.;Yuk, I. S.;Ryu, K.-S.;Park, J. H.;Jin, H.;Seon, J.-H.;Oh, S.-H;Rhee, J.-G.;Lee, D.-H.;Nam, U.-W.;Han, W.;Min, K.-W.;Lee, W.-B.;Edelstein, J.;Korpela, E.
- Journal of Astronomy and Space Sciences
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- v.18 no.3
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- pp.219-230
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- 2001
Far-ultraviolet IMaging Spectrograph (FIMS) is under development as the main pay-load of the first Korean science satellite, KAISTSAT-4. An extensive sensitivity and error budget analyses of FIMS optical system have been performed. As an way of estimating aggregate effects of all tolerances, a Monte Carlo simulation is used. The simulation result shows that the optical performance required from the science objectives is achieved within the probability higher than 99.9%.
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Ryu, K.-S.;Yuk, I. S.;Seon, K.-I.;Lee, Y.-W.;Nam, U.-W.;Shin, J.-H.;Hong, S.-J.;Lee, D.-H.;Jin, H.;Oh, S.-H;Rhee, J.-G.;Min, K.-W.;Han, W.;Park, J.-H.;Edelstein, J.;Korpela, E. J.
- Journal of Astronomy and Space Sciences
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- v.18 no.3
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- pp.239-248
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- 2001
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 $lambda$ per cm which is closely related with the astronomical performances. In case of the surface roughness, temperature controlled pitch polishing reduces $R_{q}$ 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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