Tip-tilt performance test of FSMP for development of the GMT FSM

Kim, Sanghyuk; Kim, Chang-Hee; Jeong, Ueejeong; Lee, Sungho; Lee, Won Gi; Lee, Chanhee; Moon, Il-Kwon; Han, Jeong-Yeol; Kim, Yunjong; Moon, Bongkon; Cho, Myung Kyu; Park, Byeong-Gon; Park, Chan; Kim, Ho-Sang; Gardner, Paul; Bernier, Robert; Groark, Frank; Chiquito, Hugo

doi:10.1117/12.2311774

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…To evaluate the FSMP system design and to identify deficiencies in performance, we have tested tip-tilt performance of FSMP more extensively in a more reliable testing environment in four different inclination angles with a 30° increment at two sample tip/tilt motions (10 Hz and 20 Hz). Analysis and the test results by Kim et al (2018) [14] indicated that the design concept worked properly in general; however, potential challenges were identified in the PDR design such as non-linearity of the PZT actuator, noise in the controller and phase unbalance among the actuators. These aspects can be resolved by the design improvements.…”

Section: Fsm Assembly Controlsmentioning

confidence: 99%

Design of the fast steering secondary mirror assembly for the Giant Magellan Telescope

Cho

Jun

Dribusch

et al. 2018

Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III

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The Fast-Steering secondary mirror (FSM) of Giant Magellan Telescope (GMT) consists of seven 1.1m diameter segments with effective diameter of 3.2m. Each of the seven segments is held by three axial supports and a central lateral support with a vacuum system to mirror gravity compensations. The mirror assembly has a tip-tilt feature capable of guiding to attenuate telescope wind shake and mount control jitter. Both on-axis and off-axis mirror segments were optimized under various design considerations using finite element analyses and optical performance analyses. An integrated model of the mirror cell assembly was developed including sub-assembly parts consisting of axial supports, lateral support, breakaway mechanism, seismic restraints, and pressure seal. In this paper for the optimized FSM mirror and mirror cell assembly, the design considerations are addressed, and performance prediction results are discussed in detail with respect to the specifications.

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Section: Fsm Assembly Controlsmentioning

confidence: 99%

Design of the fast steering secondary mirror assembly for the Giant Magellan Telescope

Cho

Jun

Dribusch

et al. 2018

Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III

Self Cite

View full text Add to dashboard Cite

show abstract

“…Analysis on the test results showed that the design concept worked properly in general and also led us to find some problems in the PDR design such as non-linearity of the PZT actuator, noise in the controller and phase unbalance among the actuators, which can be solved by the design improvements described above. More details on the FSMP dynamic test are presented by Kim et al (2018) [16] .…”

Section: Control System Designmentioning

confidence: 99%

Development status of the fast-steering secondary mirror of GMT

Lee

Han

Jeong

et al. 2018

Ground-Based and Airborne Telescopes VII

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The Giant Magellan Telescope (GMT) will be equipped with two Gregorian secondary mirrors; a fast-steering secondary mirror (FSM) for seeing-limited operations and an adaptive secondary mirror (ASM) for adaptive optics observing modes. The FSM has an effective diameter of 3.2 m and is comprised of seven 1.1 m diameter circular segments, which are conjugated 1:1 to the seven 8.4m segments of the primary mirror. Each FSM segment has a tip-tilt capability for fast guiding to attenuate telescope wind shake and jitter. The FSM is mounted on a two-stage positioning system; a macrocell that positions the entire FSM segments as an assembly and seven hexapod actuators that position and drive the individual FSM segments. In this paper, we present a technical overview of the FSM development status. More details in each area of development will be presented in other papers by the FSM team.

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Tip-tilt performance test of FSMP for development of the GMT FSM

Cited by 2 publications

References 2 publications

Design of the fast steering secondary mirror assembly for the Giant Magellan Telescope

Design of the fast steering secondary mirror assembly for the Giant Magellan Telescope

Development status of the fast-steering secondary mirror of GMT

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