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Metrology camera system of prime focus spectrograph for Subaru telescope
Author(s): Shiang-Yu Wang; Richard C. Y. Chou; Pin-Jie Huang; Yin-Chang Chang; Hung-Hsu Ling; Chi-Hung Yan; Jennifer Karr; Shu-Fu Hsu; Hsin-Yo Chen; Yen-Shan Hu; James E. Gunn; Dan J. Reiley; Naoyuki Tamura; Naruhisa Takato; Yuki Moritani; Atsushi Shimono
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Paper Abstract

The Prime Focus Spectrograph (PFS) is a new optical/near-infrared multi-fiber spectrograph designed for the prime focus of the 8.2m Subaru telescope. PFS will cover a 1.3 degree diameter field with 2394 fibers to complement the imaging capabilities of Hyper SuprimeCam. To retain high throughput, the final positioning accuracy between the fibers and observing targets of PFS is required to be less than 10 μm. The metrology camera system (MCS) serves as the optical encoder of the fiber positioners for the configuring of fibers. MCS provides the fiber positions within a 5 microns error over the 45 cm focal plane. The information from MCS will be fed into the fiber positioner control system for the closed loop control. MCS locates at the Cassegrain focus of Subaru telescope to cover the whole focal plan with one 50M pixel Canon CMOS camera. It is a 380 mm aperture Schmidt type telescope which generates uniform spot size around 10 µm FWHM across the field for reasonable sampling of the point spreading function. An achromatic lens set is designed to remove the possible chromatic error due to the variation of the LED wavelength. Carbon fiber tubes are used to provide stable structure over the operation conditions without focus adjustments. The CMOS sensor can be read in 0.8 s to reduce the overhead for the fiber configuration. The positions of all fibers can be obtained within 0.5 s after the readout of the frame. This enables the overall fiber configuration to be less than 2 minutes. MCS is installed inside a standard Subaru Cassgrain Box. All components generate heat are located inside a glycol cooled cabinet to reduce the possible image motion due to the heat. The integration of MCS started from fall 2017 and it was delivered to Subaru in April 2018. In this report, the performance of MCS after the integration and verification process in ASIAA and the performance after the delivery to Subaru telescope are presented.

Paper Details

Date Published: 9 July 2018
PDF: 11 pages
Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107027H (9 July 2018); doi: 10.1117/12.2311902
Show Author Affiliations
Shiang-Yu Wang, Institute of Astronomy and Astrophysics - Academia Sinica (Taiwan)
Richard C. Y. Chou, Institute of Astronomy and Astrophysics - Academia Sinica (Taiwan)
Pin-Jie Huang, Institute of Astronomy and Astrophysics - Academia Sinica (Taiwan)
Yin-Chang Chang, Institute of Astronomy and Astrophysics - Academia Sinica (Taiwan)
Hung-Hsu Ling, Institute of Astronomy and Astrophysics - Academia Sinica (Taiwan)
Chi-Hung Yan, Institute of Astronomy and Astrophysics - Academia Sinica (Taiwan)
Jennifer Karr, Institute of Astronomy and Astrophysics - Academia Sinica (Taiwan)
Shu-Fu Hsu, Institute of Astronomy and Astrophysics - Academia Sinica (Taiwan)
Hsin-Yo Chen, Institute of Astronomy and Astrophysics - Academia Sinica (Taiwan)
Yen-Shan Hu, Institute of Astronomy and Astrophysics - Academia Sinica (Taiwan)
James E. Gunn, Princeton Univ. (United States)
Dan J. Reiley, California Institute of Technology (United States)
Naoyuki Tamura, Kavli Institute for the Physics and Mathematics of the Universe (Japan)
Naruhisa Takato, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Yuki Moritani, Kavli Institute for the Physics and Mathematics of the Universe (Japan)
Atsushi Shimono, Kavli Institute for the Physics and Mathematics of the Universe (Japan)


Published in SPIE Proceedings Vol. 10702:
Ground-based and Airborne Instrumentation for Astronomy VII
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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