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

Chapin, Edward L. and Dunn, Jennifer and Andersen, David and Herriot, Glen and Kerley, Dan and Nakamoto, Takashi and Johnson, Jimmy and Wang, Lianqi and Trancho, Gelys and Chisholm, Eric and Ellerbroek, Brent and Gillies, Kim and Hayano, Yutaka and Larkin, James and Simard, Luc and Sirota, Mark and Suzuki, Ryuji and Weber, Bob and Wright, Shelley and Zhang, Kai (2018) The Infrared Imaging Spectrograph (IRIS) for TMT: closed-loop adaptive optics while dithering. In: Software and Cyberinfrastructure for Astronomy V. Proceedings of SPIE. No.10707. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 107071E. ISBN 9781510619678. http://resolver.caltech.edu/CaltechAUTHORS:20190103-153504398

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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.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.2312804DOIArticle
ORCID:
AuthorORCID
Larkin, James0000-0001-7687-3965
Wright, Shelley0000-0003-1034-8054
Additional Information:© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE). The TMT Project gratefully acknowledges the support of the TMT collaborating institutions. They are the California Institute of Technology, the University of California, the National Astronomical Observatory of Japan, the National Astronomical Observatories of China and their consortium partners, the Department of Science and Technology of India and their supported institutes, and the National Research Council of Canada. This work was supported as well by the Gordon and Betty Moore Foundation, the Canada Foundation for Innovation, the Ontario Ministry of Research and Innovation, the Natural Sciences and Engineering Research Council of Canada, the British Columbia Knowledge Development Fund, the Association of Canadian Universities for Research in Astronomy (ACURA), the Association of Universities for Research in Astronomy (AURA), the U.S. National Science Foundation, the National Institutes of Natural Sciences of Japan, and the Department of Atomic Energy of India.
Group:Thirty Meter Telescope
Funders:
Funding AgencyGrant Number
CaltechUNSPECIFIED
University of CaliforniaUNSPECIFIED
National Astronomical Observatory of JapanUNSPECIFIED
National Astronomical Observatories, Chinese Academy of Sciences (NAOC)UNSPECIFIED
Department of Science and Technology (India)UNSPECIFIED
National Research Council of CanadaUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Canada Foundation for InnovationUNSPECIFIED
Ontario Ministry of Research and InnovationUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
British Columbia Knowledge Development FundUNSPECIFIED
Association of Canadian Universities for Research in Astronomy (ACURA)UNSPECIFIED
Association of Universities for Research in Astronomy (AURA)UNSPECIFIED
NSFUNSPECIFIED
National Institutes of Natural Sciences of JapanUNSPECIFIED
Department of Atomic Energy (India)UNSPECIFIED
Subject Keywords:coordinated motion control, real-time control, adaptive optics, wavefront sensors, TMT, IRIS, NFIRAOS
Record Number:CaltechAUTHORS:20190103-153504398
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20190103-153504398
Official Citation: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, "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); doi: 10.1117/12.2312804
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92057
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:04 Jan 2019 00:19
Last Modified:04 Jan 2019 00:19

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