Concept Study of On-Instrument Wavefront Sensors (OIWFS) for the TMT IRIS Science Instrument

D. Loop; M. Fletcher; V. Reshetov; R. Wooff; J. Dunn; G. Herriot; A. Moore; R. Dekany; A. Delacroix; R. Smith; D. Hale; J. Larkin; L. Simard; D. Crampton; B. Ellerbroek; C. Boyer; L. Wang

doi:10.1051/ao4elt/201005013

All issues

Year: 2010

10.1051/ao4elt/201005013

Abstract

Open Access

Issue		2010


Article Number		05013
Number of page(s)		6
Section		Wave front sensing
DOI		https://doi.org/10.1051/ao4elt/201005013
Published online		24 February 2010

1st AO4ELT conference, 05013 (2010)

Concept Study of On-Instrument Wavefront Sensors (OIWFS) for the TMT IRIS Science Instrument

D. Loop¹^a, M. Fletcher¹, V. Reshetov¹, R. Wooff¹, J. Dunn¹, G. Herriot¹, A. Moore², R. Dekany², A. Delacroix², R. Smith², D. Hale², J. Larkin³, L. Simard⁴, D. Crampton⁴, B. Ellerbroek⁴, C. Boyer⁴ and L. Wang⁴

¹ NRC Herzberg Institute of Astrophysics, 5071 W. Saanich Rd., Victoria, BC V9E 2E7, CANADA
² Caltech Astronomy Department, 1200 E. California Blvd, Pasadena, CA 91125, USA
³ UCLA Infrared Laboratory, 430 Portola Plaza, Los Angeles, CA 90095-1547, USA
⁴ TMT Observatory, 2632 E. Washington Blvd, Pasadena, CA 91107, USA

^a e-mail: david.loop@nrc-cnrc.gc.ca

Abstract

We report on the concept study of the IRIS On-Instrument WaveFront Sensors (OIWFS), a collab- orative effort by NRC-HIA, Caltech, and TMT AO and Instrument teams. Our concept study includes work on the system design of the low order natural guide star wavefront sensors located on-instrument within IRIS as well as the NFIRAOS-IRIS interface. The OIWFS study involves patrol geometry, detector alternatives, sky coverage modeling, acquisition, guiding, and dithering scenarios, and interfaces with NFIRAOS, IRIS, and the TMT observatory. It also includes work on probe optics, mechanics, and controls, detector arrays and controllers, instrument rotator and cable wrap, and thermal and structural design of the OIWFS enclosure.