Development Status of the Prototype of the GMT Fast Steering Mirror

Details Development Status of the Prototype of the GMT Fast Steering Mirror Development Status of the Prototype of the GMT Fast Steering Mirror

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21942215k&link_type=abstract

American Astronomical Society, AAS Meeting #219, #422.15

Astronomy and Astrophysics

Astronomy

Scientific paper

Fast Steering Mirror (FSM) is one of the secondary mirror systems of the Giant Magellan Telescope. FSM is 3.2 m in diameter and has a fast focal ratio of 0.65. FSM consists of seven segments. Each segment is 1m in diameter and the surrounding six segments except the center one are off-axis mirrors. FSM compensates image degradations caused by wind disturbances and structure jitter by using a tip-tilt mechanism.
Korea Astronomy and Space Science Institute is developing a prototype of the FSM together with collaborators in Korea and USA. The prototype is a full-size FSM segment, which has two features; an off-axis mirror and a test-bed for tip-tilt actuation. The off-axis mirror with a diameter of 1.06m is being fabricated. Light-weighting is proceeding, and polishing, figuring, and testing will follow. The tip-tilt test-bed is integrated with a dummy aluminum mirror, three axial supports, a lateral support, and a test-bed frame. The test-bed will demonstrate to verify the tip-tilt parameters and measure reaction forces from tip-tilt actuation. The prototype is expected to be completed by 2012. In this paper, we present progress of the prototype development, and future works.

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