22 July 2016 Development of superconducting voice coil motor of a cold chopper for MICHI
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Abstract
A cold chopper is a key device for next generation mid-infrared instruments such as TMT/MICHI. It should achieve fast and accurate position switching with a large chopping throw at cryogenic temperature. To satisfy the requirements, voice coil motors using superconducting MgB2 wire have been developed. We have made a first prototype of the VCM and carried out its performance measurements such as a transition temperature, transfer functions, and power dissipation in the laboratory. The results are almost consistent with the expectations and the calculations, but some show significant inconsistency. We have also made a next prototype which is small to fit the size of the MICHI chopper. This will be installed to a developing mid-infrared instrument MIMIZUKU and used for actual observations.
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Kiyoshi Mori, Kiyoshi Mori, Takashi Miyata, Takashi Miyata, Mitsuhiko Honda, Mitsuhiko Honda, Takafumi Kamizuka, Takafumi Kamizuka, Hidenori Takahashi, Hidenori Takahashi, Shigeyuki Sako, Shigeyuki Sako, Ryou Ohsawa, Ryou Ohsawa, Kazushi Okada, Kazushi Okada, Masahito S. Uchiyama, Masahito S. Uchiyama, Hirokazu Kataza, Hirokazu Kataza, Hiroyuki Ohsaki, Hiroyuki Ohsaki, Takashi Hiroe, Takashi Hiroe, Chris Packham, Chris Packham, } "Development of superconducting voice coil motor of a cold chopper for MICHI", Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 991218 (22 July 2016); doi: 10.1117/12.2231889; https://doi.org/10.1117/12.2231889
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