Thirty Meter Telescope (TMT) Narrow Field Infrared Adaptive Optics System (NFIRAOS) real-time controller preliminary architecture

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

doi:10.1117/12.2233709

Cited by 6 publications

(6 citation statements)

References 5 publications

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“…. send control commands to the wavefront correction devices, is rather short and of the order of 0.2-2 milliseconds (Gratadour et al, 2016;Kerley et al, 2016;Bouchez et al, 2014). This \low latency" requirement de¯nes the control bandwidth of the AO system as well as the stability and robustness of the closed-loop (Adkins, 2012).…”

Section: Ao Real-time Control Systemsmentioning

confidence: 99%

Adaptive Optics for Extremely Large Telescopes

Hippler

2019

J. Astron. Instrum.

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Adaptive Optics (AO) has become a key technology for the largest ground-based telescopes currently under, or close to beginning of, construction. AO is an indispensable component and has basically only one task, that is to operate the telescope at its maximum angular resolution, without optical degradations resulting from atmospheric seeing. Based on three decades of experience using AO usually as an add-on component, all extremely large telescopes and their instrumentation are designed for di®raction limited observations from the very beginning. This paper illuminates various approaches of the ELT, the Giant Magellan Telescope (GMT), and the Thirty-Meter Telescope (TMT), to fully integrate AO in their designs. The paper concludes with a brief look into the requirements that high-contrast imaging poses on AO.

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Section: Ao Real-time Control Systemsmentioning

confidence: 99%

Adaptive Optics for Extremely Large Telescopes

Hippler

2019

J. Astron. Instrum.

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“…The system architecture is based upon commercial server hardware with a classical Matrix Vector Multiply (MVM) control algorithm. Intensive benchmarking have been conducted to support this architecture and have demonstrated that the performance requirements can be met by using a moderate number of existing off-the-shelf commercial boards, which in addition enable the use of a significantly simpler RTC algorithm (MVM) [14], [15] .…”

Section: Real Time Controllermentioning

confidence: 99%

Adaptive optics program update at TMT

Boyer

Ellerbroek

2016

Adaptive Optics Systems V

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The TMT first light AO facility consists of the Narrow Field Infra-Red AO System (NFIRAOS), the associated Laser Guide Star Facility (LGSF) and the AO Executive Software (AOESW). Design, fabrication and prototyping activities of the TMT first light AO systems and their components have significantly ramped up in Canada, China, France, and in the US. NFIRAOS is an order 60 x 60 laser guide star (LGS) multi-conjugate AO (MCAO) system, which provides uniform, diffraction-limited performance in the J, H, and K bands over 34 x 34 arc sec fields with 50 per cent sky coverage at the galactic pole, as required to support the TMT science cases. NFIRAOS includes two deformable mirrors, six laser guide star wavefront sensors, one high order Pyramid WFS for natural guide star AO, and up to three low-order, IR, natural guide star on-instrument wavefront sensors (OIWFS) and four on-detector guide windows (ODGW) within each client instrument. The first light LGSF system includes six sodium lasers to generate the NFIRAOS laser guide stars. In this paper, we will provide an update on the progress in designing, prototyping, fabricating and modeling the TMT first light AO systems and their AO components over the last two years. TMT is continuing with detailed AO modeling to support the design and development of the first light AO systems and components. Major modeling topics studied during the last two years include further studies in the area of pyramid wavefront sensing, high precision astrometry, PSF reconstruction for LGS MCAO, LGSF wavefront error budget and sophisticated low order mode temporal filtering.

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“…The most recent hardware benchmarking results point to CPUs and Intel Xeon Phi coprocessors being preferred over GPUs. 13,14 The European Southern Telescope (ESO) has also moved on from a combination of FPGAs and Digital Signal Processors (DSPs) for its AO RTC 15 to a heterogenous architecture involving CPUs and GPUs for mathematical processing and FPGAs for the high-speed interfacing. 16,17 A similar scalable AO kernel involving an FPGA-based Network Interface Card (NIC) for peer-to-peer communication, with GPUs performing the intensive computational part, is explored in Perret et al 18 A more recent approach from ESO (called Green Flash) aims to compare competing technologies of co-processors, GPUs and FPGAs for use as the computing platform for the AO system on the E-ELT.…”

Section: Introductionmentioning

confidence: 99%

Scalable platform for adaptive optics real-time control, part 2: field programmable gate array implementation and performance

Surendran

Burse

Ramaprakash

et al. 2018

J. Astron. Telesc. Instrum. Syst.

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The next generation of Adaptive Optics (AO) systems on large telescopes will require immense computation performance and memory bandwidth, both of which are challenging with the technology available today. The objective of this work is to create a future-proof adaptive optics platform on an FPGA architecture, which scales with the number of subapertures, pixels per subaperture and external memory. We have created a scalable adaptive optics platform with an off-the-shelf FPGA development board, which provides an AO reconstruction time only limited by the external memory bandwidth. SPARC uses the same logic resources irrespective of the number of subapertures in the AO system. This paper is aimed at embedded developers who are interested in the FPGA design and the accompanying hardware interfaces. The central theme of this paper is to show how scalability is incorporated at different levels of the FPGA implementation. This work is a continuation of Part 1 of the paper which explains the concept, objectives, control scheme and method of validation used for testing the platform.

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Thirty Meter Telescope (TMT) Narrow Field Infrared Adaptive Optics System (NFIRAOS) real-time controller preliminary architecture

Cited by 6 publications

References 5 publications

Adaptive Optics for Extremely Large Telescopes

Adaptive Optics for Extremely Large Telescopes

Adaptive optics program update at TMT

Scalable platform for adaptive optics real-time control, part 2: field programmable gate array implementation and performance

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