Ki-Beom Ahn, Soomin Jeong, Sug-Whan Kim, Jiwoo Nam, Pisin Chen, Hyeunseok Choi, Yeon Ju Choi, Bruce Grossan, Indra Herman, Ming-Huey Huang, Aera Jung, Jieun Kim, Yewon Kim, Jik Lee, Heuijin Lim, Eric Linder, Tsung-Che Liu, Kyoungwook Min, Gowoon Na, Koo Hyun Nam, Michel Panasyuk, George Smoot, Young Suh, Sergey Svertilov, Nikolay Vedenkin, Ivan Yashin, Myungheh Cho, Il Park
KEYWORDS: Space telescopes, Mirrors, Telescopes, Modulation transfer functions, Sensors, Point spread functions, Space mirrors, Aerospace engineering, Gamma radiation, Observatories
The UFFO (Ultra-Fast Flash Observatory) Pathfinder is a space instrument onboard the Lomonosov satellite scheduled
to be launched in November 2011. It is designed for extremely fast observation of optical counterparts of Gamma Ray
Bursts (GRBs). It consists of two subsystems; i) UBAT (UFFO Burst Alert & Trigger Telescope) and ii) SMT (Slewing
Mirror Telescope). This study is concerned with SMT opto-mechanical subsystem design and optical performance test.
SMT is a F/11.4 Ritchey-Chretien type telescope benefited from compact design with a short optical tube assembly for
the given focal length of 1,140 mm. SMT is designed to operate over a wide range of wavelength between 200 nm and
650 nm and has 17 arcmin FOV (Field of View), providing 4 arcsec in detector pixel resolution. The main detector is
256 x 256 ICCD (Intensified Charge-Coupled Device) of 22.2μm in pixel size. This SMT design offers good imaging
performance including 0.77 in MTF at Nyquist frequency of 22.52 /mm and 2.7 μm in RMS spot radius. The primary
(M1) and secondary (M2) mirror are hyperbolic surfaces and were manufactured within 1/50 waves (He-Ne, 632.8nm) in
RMS surface error. After completion of the initial integration, the SMT opto-mechanical subsystem reached to the
system wavefront error better than 1/10 waves in room temperature. We then tested the opto-mechanical performances
under thermal cycling and vibration. In this study, we report the SMT subsystem design solution and integration together
with thermal and vibration test results.
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