Mr. Kotaro Kato Profile

Kotaro Kato

at Kanazawa Univ

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Proceedings Article | 13 December 2020 Poster + Paper

Development of a cold chopper for TAO/MIMIZUKU

Mitsuhiko Honda, Takafumi Kamizuka, Ichiro Jikuya, Takashi Miyata, Kotaro Kato, Daichi Uchida, Shingo Kondo, Tsubasa Michifuji, Katsuhiko Yamada

Proceedings Volume 11451, 114514Z (2020) https://doi.org/10.1117/12.2561926

KEYWORDS: Mid-IR, Telescopes, Mirrors, Astronomy, Large telescopes, Switching, Observatories, Actuators, Sensors, Position sensors

Read Abstract +

An internal cold chopper is one of the key elements for the ground-based mid-infrared astronomical instruments of the next generation large telescopes such as TMT, GMT, and ELT. For ground-based mid-infrared observations, time variations of radiation from atmosphere, telescope, and instrument are often many times greater than the radiation from targets. Relatively fast (~5 Hz) beam switching technique (chopping) using the oscillating secondary mirror is often used for 8-m class telescopes to remove these background variations, but this is impractical for the 30-m class telescopes due to their much larger secondary mirror. Instead of it, internal chopping mirror is desired for the next generation groundbased mid-infrared astronomy. However, since the mid-IR instruments are usually cooled as low as ~30 K, such internal chopping mirror should also be cooled to that low temperature and low power dissipation of <1 W is required to maintain the low temperature environment, thus it is not so easy to have such cold chopper. As a testbed for that, we are developing an internal cold chopper for the mid-infrared instrument MIMIZUKU for the University of Tokyo Atacama Observatory (TAO) 6.5-m telescope. We use a voice-coil-like structure as actuators and capacitive gap sensors as position sensors. We construct a feedback control system for the rectangular command signal. We made a prototype cold chopper for TAO/MIMIZUKU and are currently evaluating this system. We present the current design of the cold chopper for MIMIZUKU and results of performance evaluation in the laboratory.

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