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Proceedings Paper

Metrology camera system of prime focus spectrograph for Suburu telescope
Author(s): Shiang-Yu Wang; Richard C. Y. Chou; Pin-Jie Huang; Hung-Hsu Ling; Jennifer Karr; Yin-Chang Chang; Yen-Sang Hu; Shu-Fu Hsu; Hsin-Yo Chen; James E. Gunn; Dan J. Reiley; Naoyuki Tamura; Naruhisa Takato; 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 microns. The metrology camera system (MCS) serves as the optical encoder of the fiber motors 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 will be located at the Cassegrain focus of Subaru telescope in order to cover the whole focal plane with one 50M pixel Canon CMOS camera. It is a 380mm Schmidt type telescope which generates a uniform spot size with a ~10 micron FWHM across the field for reasonable sampling of the point spread function. Carbon fiber tubes are used to provide a stable structure over the operating conditions without focus adjustments. The CMOS sensor can be read in 0.8s to reduce the overhead for the fiber configuration. The positions of all fibers can be obtained within 0.5s after the readout of the frame. This enables the overall fiber configuration to be less than 2 minutes. MCS will be installed inside a standard Subaru Cassgrain Box. All components that generate heat are located inside a glycol cooled cabinet to reduce the possible image motion due to heat. The optics and camera for MCS have been delivered and tested. The mechanical parts and supporting structure are ready as of spring 2016. The integration of MCS will start in the summer of 2016. In this report, the performance of the MCS components, the alignment and testing procedure as well as the status of the PFS MCS will be presented.

Paper Details

Date Published: 9 August 2016
PDF: 11 pages
Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 990881 (9 August 2016); doi: 10.1117/12.2232035
Show Author Affiliations
Shiang-Yu Wang, Institute of Astronomy and Astrophysics (Taiwan)
Richard C. Y. Chou, Institute of Astronomy and Astrophysics (Taiwan)
Pin-Jie Huang, Institute of Astronomy and Astrophysics (Taiwan)
Hung-Hsu Ling, Institute of Astronomy and Astrophysics (Taiwan)
Jennifer Karr, Institute of Astronomy and Astrophysics (Taiwan)
Yin-Chang Chang, Institute of Astronomy and Astrophysics (Taiwan)
Yen-Sang Hu, Institute of Astronomy and Astrophysics (Taiwan)
Shu-Fu Hsu, Institute of Astronomy and Astrophysics (Taiwan)
Hsin-Yo Chen, Institute of Astronomy and Astrophysics (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)
Atsushi Shimono, Kavli Institute for the Physics and Mathematics of the Universe (Japan)


Published in SPIE Proceedings Vol. 9908:
Ground-based and Airborne Instrumentation for Astronomy VI
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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