Daytime calibration and testing of the Keck All sky Precision Adaptive Optics Tomography System
Abstract
The development of the Keck All sky Precision Adaptive optics (KAPA) project was initiated in September 2018 to upgrade the Keck I adaptive optics (AO) system to enable laser tomography adaptive optics (LTAO) with a four laser guide star (LGS) asterism. The project includes the replacement of the existing LMCT laser with a Toptica laser, the implementation of a new real-time controller (RTC) and wavefront sensor optics and camera, and a new daytime calibration and test platform to provide the required infrastructure for laser tomography. The work presented here describes the new daytime calibration infrastructure to test the performance for the KAPA tomographic algorithms. This paper outlines the hardware infrastructure for daytime calibration and performance assessment of tomographic algorithms. This includes the implementation of an asterism simulator having fiber-coupled light sources simulating four Laser Guide Stars (LGS) and two Natural Guide Stars (NGS) at the AO bench focus, as well as the upgrade of the existing TelSim on the AO bench to simulate focal anisoplanatism and wind driven atmospheric turbulence. A phase screen, that can be adjusted in effective altitude, is used to simulate wind speeds up to 10 m/s for a duration of upto 3 s.
Keywords
Cite
@article{arxiv.2207.14433,
title = {Daytime calibration and testing of the Keck All sky Precision Adaptive Optics Tomography System},
author = {Avinash Surendran and Jacques R. Delorme and Carlos M. Correia and Steve Doyle and Sam Ragland and Paul Richards and Peter Wizinowich and Philip M. Hinz and Daren Dillon and Cesar Laguna and Sylvain Cetre and Scott Lilley and Ed Wetherell and Jason C. Y. Chin and Eduardo Marin},
journal= {arXiv preprint arXiv:2207.14433},
year = {2022}
}
Comments
15 pages, 13 figures. Publishd as part of SPIE Astronomical telescopes + Instrumentation 2022 proceedings