The Infrared Imaging Spectrograph (IRIS) for TMT: closed-loop adaptive optics while dithering

Edward L. Chapin; Jennifer Dunn; David Andersen; Glen Herriot; Dan Kerley; Takashi Nakamoto; Jimmy Johnson; Lianqi Wang; Gelys Trancho; Eric Chisholm; Brent Ellerbroek; Kim Gillies; Yutaka Hayano; James Larkin; Luc Simard; Mark Sirota; Ryuji Suzuki; Robert Weber; Shelley Wright; Kai Zhang

doi:10.1117/12.2312804

6 July 2018 The Infrared Imaging Spectrograph (IRIS) for TMT: closed-loop adaptive optics while dithering

Edward L. Chapin, Jennifer Dunn, David Andersen, Glen Herriot, Dan Kerley, Takashi Nakamoto, Jimmy Johnson, Lianqi Wang, Gelys Trancho, Eric Chisholm, Brent Ellerbroek, Kim Gillies, Yutaka Hayano, James Larkin, Luc Simard, Mark Sirota, Ryuji Suzuki, Robert Weber, Shelley Wright, Kai Zhang

Author Affiliations +

Proceedings Volume 10707, Software and Cyberinfrastructure for Astronomy V; 107071E (2018) https://doi.org/10.1117/12.2312804
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

The InfraRed Imaging Spectrograph (IRIS) is the first-light client instrument for the Narrow Field Infrared Adaptive Optics System (NFIRAOS) on the Thirty Meter Telescope (TMT). IRIS includes three natural guide star (NGS) On-Instrument Wavefront Sensors (OIWFS) to measure tip/tilt and focus errors in the instrument focal plane. NFIRAOS also has an internal natural guide star wavefront sensor, and IRIS and NFIRAOS must precisely coordinate the motions of their wavefront sensor positioners to track the locations of NGSs while the telescope is dithering (offsetting the telescope to cover more area), to avoid a costly re-acquisition time penalty. First, we present an overview of the sequencing strategy for all of the involved subsystems. We then predict the motion of the telescope during dithers based on finite-element models provided by TMT, and finally analyze latency and jitter issues affecting the propagation of position demands from the telescope control system to individual motor controllers.

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Edward L. Chapin, Jennifer Dunn, David Andersen, Glen Herriot, Dan Kerley, Takashi Nakamoto, Jimmy Johnson, Lianqi Wang, Gelys Trancho, Eric Chisholm, Brent Ellerbroek, Kim Gillies, Yutaka Hayano, James Larkin, Luc Simard, Mark Sirota, Ryuji Suzuki, Robert Weber, Shelley Wright, and Kai Zhang "The Infrared Imaging Spectrograph (IRIS) for TMT: closed-loop adaptive optics while dithering", Proc. SPIE 10707, Software and Cyberinfrastructure for Astronomy V, 107071E (6 July 2018); https://doi.org/10.1117/12.2312804

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