Fabrication of the Prototype of the GMT Fast Steering Mirror
Abstract
Giant Magellan Telescope possesses two secondary mirror systems - Fast Steering Mirror (FSM) and Adaptive Secondary Mirror (ASM). FSM would compensate wind effect and structure jitter by using a tip-tilt mechanism. FSM is 3.2 m in diameter and has a fast focal ratio of 0.65. FSM consists of seven segments each of which is 1.1 m in diameter. An FSM prototype (FSMP) has been developed, which consists of a full-size off-axis mirror segment and a tip-tilt test-bed. By developing the FSMP, the key technologies- fabrication of highly aspheric off-axis mirror and tip-tilt actuation - would be achieved. The backside of the mirror was completed by spherical surface with light-weighting and etching. The grinding of the front surface was finished, and polishing is in progress. The tip-tilt test-bed has also been manufactured and assembled. Frequency tests are being performed with fine tuning of the assembly. For the development of the FSMP, Korea Astronomy and Space Science Institute is working together with other institutions in Korea and USA. In this paper, we present progress of the prototype development, and future works.
- Publication:
-
American Astronomical Society Meeting Abstracts #221
- Pub Date:
- January 2013
- Bibcode:
- 2013AAS...22143909K