Thirty Meter Telescope narrow-field infrared adaptive optics system real-time controller prototyping results

Malcolm Smith; Dan Kerley; Edward L. Chapin; Jennifer Dunn; Glen Herriot; Jean-Pierre Véran; Corinne Boyer; Brent Ellerbroek; Luc Gilles; Lianqi Wang

doi:10.1117/12.2233711

27 July 2016 Thirty Meter Telescope narrow-field infrared adaptive optics system real-time controller prototyping results

Malcolm Smith, Dan Kerley, Edward L. Chapin, Jennifer Dunn, Glen Herriot, Jean-Pierre Véran, Corinne Boyer, Brent Ellerbroek, Luc Gilles, Lianqi Wang

Author Affiliations +

Proceedings Volume 9909, Adaptive Optics Systems V; 99094N (2016) https://doi.org/10.1117/12.2233711
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

Prototyping and benchmarking was performed for the Real-Time Controller (RTC) of the Narrow Field InfraRed Adaptive Optics System (NFIRAOS). To perform wavefront correction, NFIRAOS utilizes two deformable mirrors (DM) and one tip/tilt stage (TTS). The RTC receives wavefront information from six Laser Guide Star (LGS) Shack- Hartmann WaveFront Sensors (WFS), one high-order Natural Guide Star Pyramid WaveFront Sensor (PWFS) and multiple low-order instrument detectors. The RTC uses this information to determine the commands to send to the wavefront correctors. NFIRAOS is the first light AO system for the Thirty Meter Telescope (TMT).

The prototyping was performed using dual-socket high performance Linux servers with the real-time (PREEMPT_RT) patch and demonstrated the viability of a commercial off-the-shelf (COTS) hardware approach to large scale AO reconstruction. In particular, a large custom matrix vector multiplication (MVM) was benchmarked which met the required latency requirements. In addition all major inter-machine communication was verified to be adequate using 10Gb and 40Gb Ethernet. The results of this prototyping has enabled a CPU-based NFIRAOS RTC design to proceed with confidence and that COTS hardware can be used to meet the demanding performance requirements.

Citation Download Citation

Malcolm Smith, Dan Kerley, Edward L. Chapin, Jennifer Dunn, Glen Herriot, Jean-Pierre Véran, Corinne Boyer, Brent Ellerbroek, Luc Gilles, and Lianqi Wang "Thirty Meter Telescope narrow-field infrared adaptive optics system real-time controller prototyping results", Proc. SPIE 9909, Adaptive Optics Systems V, 99094N (27 July 2016); https://doi.org/10.1117/12.2233711

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