10 July 2018 Control modeling of the fast-steering secondary mirror for GMT
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Abstract
The Giant Magellan Telescope (GMT) will feature two Gregorian secondary mirrors, an adaptive secondary mirror (ASM) and a fast-steering secondary mirror (FSM). The FSM has an effective diameter of 3.2 m and consists of seven 1.1 m diameter circular segments, which are conjugated 1:1 to the seven 8.4m segments of the primary. Each FSM segment contains a tip-tilt capability for fast guiding to attenuate telescope wind shake and mount control jitter. This tiptilt capability thus enhances performance of the telescope in the seeing limited observation mode. The tip-tilt motion of the mirror is produced by three piezo actuators. In this paper we present a simulation model of the tip-tilt system which focuses on the piezo-actuators. The model includes hysteresis effects in the piezo elements and the position feedback control loop.
Conference Presentation
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Christoph Dribusch, Christoph Dribusch, Myung K. Cho, Myung K. Cho, Youra Jun, Youra Jun, Jieun Ryu, Jieun Ryu, Gary Poczulp, Gary Poczulp, Ming Liang, Ming Liang, Sungho Lee, Sungho Lee, Jeong-Yeol Han, Jeong-Yeol Han, Ueejeong Jeong, Ueejeong Jeong, Sanghyuk Kim, Sanghyuk Kim, Bong-Kon Moon, Bong-Kon Moon, Chang-Hee Kim, Chang-Hee Kim, Yunjong Kim, Yunjong Kim, Chan Park, Chan Park, Byeong-Gon Park, Byeong-Gon Park, Il-Kwon Moon, Il-Kwon Moon, Chanhee Lee, Chanhee Lee, Wongi Lee, Wongi Lee, Ho-Sang Kim, Ho-Sang Kim, Paul Gardner, Paul Gardner, Robert Bernier, Robert Bernier, Frank Groark, Frank Groark, Hugo Chiquito, Hugo Chiquito, } "Control modeling of the fast-steering secondary mirror for GMT", Proc. SPIE 10705, Modeling, Systems Engineering, and Project Management for Astronomy VIII, 107050Z (10 July 2018); doi: 10.1117/12.2313351; https://doi.org/10.1117/12.2313351
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