Development of a cold chopper for TAO/MIMIZUKU: onboard test on MIMIZUKU

Ryota Kinoshita; Takafumi Kamizuka; Takashi Miyata; Ichiro Jikuya; Tomoya Kondo; Katsuhiko Yamada; Mitsuhiko Honda; Takeshi Sakanoi; Masato Kagitani; Shigeyuki Sako; Yuki Hirao; Kengo Tachibana; Akira C. Naruse; Itsuki Sakon; Riko Senoo

doi:10.1117/12.3018708

26 August 2024 Development of a cold chopper for TAO/MIMIZUKU: onboard test on MIMIZUKU

Ryota Kinoshita, Takafumi Kamizuka, Takashi Miyata, Ichiro Jikuya, Tomoya Kondo, Katsuhiko Yamada, Mitsuhiko Honda, Takeshi Sakanoi, Masato Kagitani, Shigeyuki Sako, Yuki Hirao, Kengo Tachibana, Akira C. Naruse, Itsuki Sakon, Riko Senoo

Author Affiliations +

Proceedings Volume 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI; 131006Y (2024) https://doi.org/10.1117/12.3018708
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

MIMIZUKU, the mid-infrared instrument for the 6.5-m telescope at the University of Tokyo Atacama Observatory (TAO), employs a cold chopper to perform chopping, which tilts a mirror placed on the internal cold optics at about 30 K. The mirror rotates around two orthogonal axes, and its tilt angle is controlled by the balance between the restoring force of the flexural pivots and the magnetic force driven by the coils in the system. In this study, we developed a final-product model of the chopper and tested its onboard performance in MIMIZUKU. This experiment showed that the mirror could be operated with a stability of 3.83×10⁻⁴ and 3.29×10⁻⁴ degrees, and a transition time of 31.2 and 32.2 milliseconds for each rotation, when both rotations were driven at 5 Hz with an amplitude of 0.59 degrees, satisfying the performance requirements.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Ryota Kinoshita, Takafumi Kamizuka, Takashi Miyata, Ichiro Jikuya, Tomoya Kondo, Katsuhiko Yamada, Mitsuhiko Honda, Takeshi Sakanoi, Masato Kagitani, Shigeyuki Sako, Yuki Hirao, Kengo Tachibana, Akira C. Naruse, Itsuki Sakon, and Riko Senoo "Development of a cold chopper for TAO/MIMIZUKU: onboard test on MIMIZUKU", Proc. SPIE 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI, 131006Y (26 August 2024); https://doi.org/10.1117/12.3018708

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