27 July 2016 Thirty Meter Telescope narrow-field infrared adaptive optics system real-time controller prototyping results
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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.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Malcolm Smith, Malcolm Smith, Dan Kerley, Dan Kerley, Edward L. Chapin, Edward L. Chapin, Jennifer Dunn, Jennifer Dunn, Glen Herriot, Glen Herriot, Jean-Pierre Véran, Jean-Pierre Véran, Corinne Boyer, Corinne Boyer, Brent Ellerbroek, Brent Ellerbroek, Luc Gilles, Luc Gilles, Lianqi Wang, 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); doi: 10.1117/12.2233711; https://doi.org/10.1117/12.2233711

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