Laboratory integration of the DKIST wavefront correction system

Johnson, Luke C.; Cummings, Keith; Drobilek, Mark; Johansson, Erik M. J.; Mariño, José María Solé; Rampy, Rachel; Richards, Kit; Rimmelé, Thomas; Sékulic, Predrag; Wöger, Friedrich

doi:10.1117/12.2314012

Cited by 3 publications

(2 citation statements)

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“…The instruments are installed on a rotating platform (Jeffers et al, 2016), which also serves as image de-rotator and allows for alignment of the spectrograph slits, for example, parallel or perpendicular to the limb. The tip-tilt mirror and the deformable mirror of the conventional high-order AO system (Rimmele et al, 2006;Richards et al, 2010;Johnson et al, 2018) are integrated into the transfer optics. The AO-corrected light beam feeds the four instruments that are designed to perform diffraction-limited observations at visible and near-infrared wavelengths, and which can operate simultaneously.…”

Section: Science Requirements Definitionmentioning

confidence: 99%

“…The diameter of the rotator is 16.5 m. Richards et al, 2010;Johnson et al, 2014Johnson et al, , 2016). Integration and system testing are summarized by Johnson et al (2018Johnson et al ( , 2020. The Field-Programmable-Gate-Array (FPGA) based real-time control of the AO and its integration into the overall active-and adaptive-wavefront control concept are described by Richards et al (2010).…”

Section: Wavefront Correction Systemmentioning

confidence: 99%

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The Daniel K. Inouye Solar Telescope – Observatory Overview

et al. 2020

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We present an overview of the National Science Foundation’s Daniel K. Inouye Solar Telescope (DKIST), its instruments, and support facilities. The 4 m aperture DKIST provides the highest-resolution observations of the Sun ever achieved. The large aperture of DKIST combined with state-of-the-art instrumentation provide the sensitivity to measure the vector magnetic field in the chromosphere and in the faint corona, i.e. for the first time with DKIST we will be able to measure and study the most important free-energy source in the outer solar atmosphere – the coronal magnetic field. Over its operational lifetime DKIST will advance our knowledge of fundamental astronomical processes, including highly dynamic solar eruptions that are at the source of space-weather events that impact our technological society. Design and construction of DKIST took over two decades. DKIST implements a fast (f/2), off-axis Gregorian optical design. The maximum available field-of-view is 5 arcmin. A complex thermal-control system was implemented in order to remove at prime focus the majority of the 13 kW collected by the primary mirror and to keep optical surfaces and structures at ambient temperature, thus avoiding self-induced local seeing. A high-order adaptive-optics system with 1600 actuators corrects atmospheric seeing enabling diffraction limited imaging and spectroscopy. Five instruments, four of which are polarimeters, provide powerful diagnostic capability over a broad wavelength range covering the visible, near-infrared, and mid-infrared spectrum. New polarization-calibration strategies were developed to achieve the stringent polarization accuracy requirement of 5×10−4. Instruments can be combined and operated simultaneously in order to obtain a maximum of observational information. Observing time on DKIST is allocated through an open, merit-based proposal process. DKIST will be operated primarily in “service mode” and is expected to on average produce 3 PB of raw data per year. A newly developed data center located at the NSO Headquarters in Boulder will initially serve fully calibrated data to the international users community. Higher-level data products, such as physical parameters obtained from inversions of spectro-polarimetric data will be added as resources allow.

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Section: Science Requirements Definitionmentioning

confidence: 99%

Section: Wavefront Correction Systemmentioning

confidence: 99%

The Daniel K. Inouye Solar Telescope – Observatory Overview

et al. 2020

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The Diffraction-Limited Near-Infrared Spectropolarimeter (DL-NIRSP) of the Daniel K. Inouye Solar Telescope (DKIST)

et al. 2022

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The Diffraction-Limited Near-Infrared Spectropolarimeter (DL-NIRSP) is one of the first-light instruments for the National Science Foundation’s Daniel K. Inouye Solar Telescope (DKIST). DL-NIRSP is an integral-field, dual-beam spectropolarimeter intended for studying magnetically sensitive spectral lines in the Sun’s photosphere, chromosphere, and corona with high spectral resolution and polarimetric accuracy. Two novel fiber-optic integral-field units (IFUs), paired with selectable feed optics and a field-scanning mirror provide great flexibility in spatial sampling ($0.03^{\prime\prime}$ 0.03 ″ , $0.08^{\prime\prime}$ 0.08 ″ , and $0.5^{\prime \prime}$ 0.5 ″ ) and field coverage ($2^{\prime} \times 2^{\prime }$ 2 ′ × 2 ′ ). The IFUs allow DL-NIRSP to record all the spectra from a 2D field of view simultaneously, enabling the instrument to study the evolution of highly dynamic events. The spectrograph is an all-reflecting, near-Littrow design, which achieves a resolving power of approximately 125,000. Multiple wavelengths can be observed simultaneously using three spectral arms: one for visible wavelengths (500 – 900 nm) and two for infrared wavelengths (900 – 1350 nm and 1350 – 1800 nm). Each supporting camera sub-system is capable of a 30-Hz frame rate, making it possible to track dynamic phenomena on the Sun.

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