Sunrise III: The Wavefront Correction System
Thomas Berkefeld, Alexander Bell, Reiner Volkmer, Frank Heidecke, Tobias Preis, Thomas Sonner, Eiji Nakai, Andreas Korpi-Lagg, Achim Gandorfer, Sami K. Solanki, Jose Carlos del Toro Iniesta, Yukio Katsukawa, Pietro Bernasconi, Alex Feller, Tino L. Riethm\"uller
TL;DR
The paper details the design, implementation, and performance of the Sunrise III wavefront correction system, achieving high-precision image stabilization and aberration correction for a balloon-borne telescope.
Contribution
It introduces a comprehensive wavefront correction system combining correlation tracking, Shack-Hartmann sensors, and active mirror adjustments for balloon telescope stabilization.
Findings
Achieved 0.005 arcsec image stabilization precision.
Maintained focus stability of 0.01 waves.
Demonstrated system performance during 2024 science flight.
Abstract
This paper describes the wave-front correction and image stabilisation system (CWS) developed for the Sunrise III balloon-borne telescope, and provides information about its performance as measured during the integration into the telescope and during the 2024 science flight. The fast image stabilisation is done by a correlation tracker (CT) and a fast tip-tilt mirror, low order aberrations such as defocus and coma are measured by a six-element Shack-Hartmann wavefront sensor (WFS) and corrected by an active telescope secondary mirror for automated focus and manual coma correction. The CWS is specified to deliver a stabilised image with a precision of 0.005 arcsec (rms). The autofocus adjustment is specified to maintain a focus stability of 0.01 waves in the focal plane of the CWS.
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