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Design of an integral field unit for SWIMS and its milling process fabrication with an ultra-high precision machine tool
Author(s): Yukihiro Kono; Yutaka Yamagata; Shin-ya Morita; Kentaro Motohara; Shinobu Ozaki; Toshihiro Tsuzuki; Hidenori Takahashi; Yutaro Kitagawa; Masahiro Konishi; Natsuko M. Kato; Yasunori Terao; Hirofumi Ohashi; Kosuke Kushibiki
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Paper Abstract

SWIMS-IFU is an image-slicer integral field unit designed for Simultaneous-color Wide-field Infrared Multi-object Spectrograph (SWIMS) of the University of Tokyo Atacama observatory 6.5m telescope. Its field-of-view, slice width and slice number are 17.2 ′′ × 12.8 ′′, 0.4 ′′ and 26, respectively. Due to the space limitation inside SWIMS, the IFU should fit in the dimension of 60mm×170mm×220mm. After finishing development of optical design, we have conducted tolerance analysis. The results show that the probability of vignetting of less than 5% is ∼90%, although at a slice of one side it drops to 50%. We plan to fabricate the mirror arrays monolithically by a ball-end milling with an ultra-high precision machine tool, and have conducted a demonstration process to prove its feasibility. Our requirement for shape error is less than 100 nm P-V and that for surface roughness is less than 10 nm r.m.s. Results of the latest demonstration satisfies the requirement. We will fabricate the mirror arrays and the support structures in 2018, and the IFU will be installed into SWIMS in 2019.

Paper Details

Date Published: 10 July 2018
PDF: 10 pages
Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 107063F (10 July 2018); doi: 10.1117/12.2312351
Show Author Affiliations
Yukihiro Kono, The Univ. of Tokyo (Japan)
Yutaka Yamagata, RIKEN (Japan)
Shin-ya Morita, Tokyo Denki Univ. (Japan)
Kentaro Motohara, The Univ. of Tokyo (Japan)
Shinobu Ozaki, National Astronomical Observatory of Japan (Japan)
Toshihiro Tsuzuki, National Astronomical Observatory of Japan (Japan)
Hidenori Takahashi, The Univ. of Tokyo (Japan)
Yutaro Kitagawa, The Univ. of Tokyo (Japan)
Masahiro Konishi, The Univ. of Tokyo (Japan)
Natsuko M. Kato, The Univ. of Tokyo (Japan)
Yasunori Terao, The Univ. of Tokyo (Japan)
Hirofumi Ohashi, The Univ. of Tokyo (Japan)
Kosuke Kushibiki, The Univ. of Tokyo (Japan)


Published in SPIE Proceedings Vol. 10706:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III
Ramón Navarro; Roland Geyl, Editor(s)

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