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.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kiyoshi Mori, Takashi Miyata, Mitsuhiko Honda, Takafumi Kamizuka, Hidenori Takahashi, Shigeyuki Sako, Ryou Ohsawa, Kazushi Okada, Masahito S. Uchiyama, Hirokazu Kataza, Hiroyuki Ohsaki, Takashi Hiroe, 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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