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Metrology camera system of prime focus spectrograph for Subaru Telescope

Wang, Shiang-Yu and Chou, Richard C. Y. and Huang, Pin-Jie and Ling, Hung-Hsu and Karr, Jennifer and Chang, Yin-Chang and Hu, Yen-Shan and Hsu, Shu-Fu and Chen, Hsin-Yo and Gunn, James E. and Reiley, Dan J. and Tamura, Naoyuki and Takato, Naruhisa and Shimono, Atsushi (2016) Metrology camera system of prime focus spectrograph for Subaru Telescope. In: Ground-based and Airborne Instrumentation for Astronomy VI. Proceedings of SPIE. No.9908. Society of Photo-Optical Instrumentation Engineers , Bellingham, WA, Art. No. 990881. ISBN 978-1-5106-0196-3.

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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.

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Additional Information:© 2016 SPIE. We gratefully acknowledge support from the Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST) "Subaru Measurements of Images and Redshifts (SuMIRe)", CSTP, Japan for PFS project. The work in ASIAA, Taiwan is supported by the Academia Sinica of Taiwan.
Funding AgencyGrant Number
Council for Science and Technology Policy (CSTP)UNSPECIFIED
Academia SinicaUNSPECIFIED
Subject Keywords:Metrology, CMOS sensor, multi-fiber, spectrograph, Schmidt telescope
Series Name:Proceedings of SPIE
Issue or Number:9908
Record Number:CaltechAUTHORS:20170217-151141725
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Official Citation: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; Metrology camera system of prime focus spectrograph for Suburu telescope. Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 990881 (August 9, 2016); doi:10.1117/12.2232035
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:74408
Deposited By: Tony Diaz
Deposited On:18 Feb 2017 03:54
Last Modified:03 Oct 2019 16:38

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