5/16/2023 0 Comments Keck observatory![]() Due to three major failures on the shutters we decided to undertake a multimillion dollar, multiyear effort to upgrade the drive system. Keck Observatory recently completed an upgrade to the Shutter Drive System on the Keck 1 dome. Initial results show large local improvements, and global improvements to our vibration environment.read more read lessĪbstract: The W. From our surveys, we prioritized facility components to be addressed, and developed approaches to mitigate key vibrations contributions. We developed a metric to evaluate the effect of vibrations on the entire interferometer beamline. For the interferometer we completed vibration surveys that correlate vibrations on the interferometer beam path with direct vibration measurements on the telescope structure and facility. Our approach is to establish reasonable confidence in identifying the facility vibration sources that most significantly deteriorate optical performance. We present our strategy for mitigating vibrations in a large ground-based telescope. This effort should improve the performance of both Keck adaptive optics systems, the laser guide star, the AO instruments, and the interferometer, and will benefit future high precision instruments. Keck Observatory is conducting a focused effort to identify and mitigate facility vibrations that significantly affect optimal optical performance. The sensor operates at either Ks or H-band using light reflected by a choice of dichroic beamsplitters located in front of the OSIRIS integral field spectrograph.read more read lessĪbstract: The W.M. Low noise at high sample rates is achieved by only reading a small region of interest, from 2×2 to 16×16 pixels, centered on an NGS anywhere in the 100 arc second diameter field. The tip-tilt sensor is a H2RG-based near-infrared camera with 0.05 arc second pixels. The implementation involved modifications to the AO bench, real-time control system, and higher level controls and operations software that will also be discussed. We present the design of a near-infrared tip-tilt sensor that has recently been integrated with the Keck I telescope’s LGS AO system along with some initial on-sky results. This limitation can be dramatically reduced by measuring the tip and tilt of the NGS in the near-infrared where the NGS is partially corrected by the LGS AO system and where stars are generally several magnitudes brighter than at visible wavelengths. ![]() read more read lessĪbstract: The sky coverage and performance of laser guide star (LGS) adaptive optics (AO) systems is limited by the natural guide star (NGS) used for low order correction. Wetherell - Show less +80 moreĪbstract: The Keck Interferometer (KI) combined the two 10 m W M Keck Observatory telescopes on Mauna Kea, Hawaii, as a long-baseline near- and mid-infrared interferometer Funded by NASA, it operated from 2001 until 2012 KI used adaptive optics on the two Keck telescopes to correct the individual wavefronts, as well as active fringe tracking in all modes for path-length control, including the implementation of cophasing to provide long coherent integration times KI implemented high sensitivity fringe-visibility measurements at H (16 μm), K (22 μm), and L (38 μm) bands, and nulling measurements at N band (10 μm), which were used to address a broad range of science topics Supporting these capabilities was an extensive interferometer infrastructure and unique instrumentation, including some additional functionality added as part of the NSF-funded ASTRA program This paper provides an overview of the instrument architecture and some of the key design and implementation decisions, as well as a description of all of the key elements and their configuration at the end of the project The objective is to provide a view of KI as an integrated system, and to provide adequate technical detail to assess the implementation Included is a discussion of the operational aspects of the system, as well as of the achieved system performance Finally, details on V^2 calibration in the presence of detector nonlinearities as applied in the data pipeline are provided. McBride, Drew Medeiros, Bertrand Mennesson, James D. Chock, Richard Cohen, Andrew Cooper, Samuel L. ![]() Ragland, Julien Woillez, Rafael Millan-Gabet, Eugene Serabyn, M. Mark Colavita, Peter Wizinowich, Rachel Akeson, S. ![]()
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