27 July 2016 Daniel K. Inouye Solar Telescope optical alignment plan
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The Daniel K. Inouye Solar Telescope (DKIST) is a 4-meter solar telescope under construction at Haleakala, Hawaii. The challenge of the DKIST optical alignment is the off-axis Gregorian configuration based on an Altitude-Azimuth mount, the independently-rotating Coudé platform and the large number of relay mirrors. This paper describes the optical alignment plan of the complete telescope, including the primary 4.24-m diameter off-axis secondary mirror, the secondary 620 mm diameter off-axis mirror, the transfer optics and the Coudé optics feeding the wavefront correction system and the science instruments. A number of accurate metrology instruments will be used to align the telescope and to reach the performances, including a laser tracker for initial positioning, a theodolite for accurate tilt alignment, a Coordinate Measurement Machine (CMM) arm for local alignment in the Coudé laboratory, and a Shack-Hartmann wavefront sensor to characterize the aberrations by measuring selected target stars. The wavefront will be characterized at the primary focus, the Gregorian focus, the intermediate focus and at the telescope focal plane. The laser tracker will serve also to measure the mirrors positions as function of Altitude angle due to the Telescope Mount Assembly (TMA) structure deflection. This paper describes also the method that will be used to compute the compensating mirrors shift and tilt needed to correct the residual aberrations and position of the focal plane.
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Predrag Sekulic, Predrag Sekulic, Chen Liang, Chen Liang, Kerry Gonzales, Kerry Gonzales, Robert P. Hubbard, Robert P. Hubbard, Simon C. Craig, Simon C. Craig, "Daniel K. Inouye Solar Telescope optical alignment plan", Proc. SPIE 9906, Ground-based and Airborne Telescopes VI, 990653 (27 July 2016); doi: 10.1117/12.2233604; https://doi.org/10.1117/12.2233604

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