Development of a cold chopper for TAO/MIMIZUKU: repetitive control

Jonathan Hort; Ichiro Jikuya; Takafumi Kamizuka; Anja Lauer; Oliver Sawodny; Ryota Kinoshita; Tomoya Kondo; Katsuhiko Yamada; Takashi Miyata; Mitsuhiko Honda; Shigeyuki Sako; Yuki Hirao; Kengo Tachibana; Akira Naruse; Itsuki Sakon; Riko Senoo; Takeshi Sakanoi; Masato Kagitani

doi:10.1117/12.3020592

26 August 2024 Development of a cold chopper for TAO/MIMIZUKU: repetitive control

Jonathan Hort, Ichiro Jikuya, Takafumi Kamizuka, Anja Lauer, Oliver Sawodny, Ryota Kinoshita, Tomoya Kondo, Katsuhiko Yamada, Takashi Miyata, Mitsuhiko Honda, Shigeyuki Sako, Yuki Hirao, Kengo Tachibana, Akira Naruse, Itsuki Sakon, Riko Senoo, Takeshi Sakanoi, Masato Kagitani

Author Affiliations +

Proceedings Volume 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI; 131001H (2024) https://doi.org/10.1117/12.3020592
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

In ground-based mid-infrared observations the background radiation must be removed. Chopping is a background removal method requiring fast switching of the observation field. For MIMIZUKU, the mid-infrared instrument for the TAO telescope, we have developed a cold chopper which switches the observing field by tilting a movable mirror inside MIMIZUKU, instead of tilting the large secondary mirror. We require a short transition time, sufficient amplitude, high frequency and steadyness for observation in the chopper movement. With Repetitive Control we significantly increase performance by iteratively improving a feedforward trajectory and continously adapting to changes in the nonlinear dynamics. This allows for much shorter transition time (<30 ms) and more freedom in the design of a feedback controller. Furthermore, repetitive disturbances originating from the cryo-cooler can be countered thus improving stability on sky. Controller design, stabilisation, choice of reference trajectory, real-time computability and performance trade-offs are subjects in this research.

Conference Presentation

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

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Jonathan Hort, Ichiro Jikuya, Takafumi Kamizuka, Anja Lauer, Oliver Sawodny, Ryota Kinoshita, Tomoya Kondo, Katsuhiko Yamada, Takashi Miyata, Mitsuhiko Honda, Shigeyuki Sako, Yuki Hirao, Kengo Tachibana, Akira Naruse, Itsuki Sakon, Riko Senoo, Takeshi Sakanoi, and Masato Kagitani "Development of a cold chopper for TAO/MIMIZUKU: repetitive control", Proc. SPIE 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI, 131001H (26 August 2024); https://doi.org/10.1117/12.3020592

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