A Caltech Library Service

Prime Focus Spectrograph (PFS): the prime focus instrument

Wang, Shiang-Yu and Huang, Pin-Jie and Chen, Hsin-Yo and Kimura, Masahiko and Wen, Chih-Yi and Yan, Chi-Hung and Karr, Jennifer E. and Chou, Richard C. Y. and Chang, Yin-Chang and Hsu, Shu-Fu and Hu, Yen-Shan and Ling, Hung-Hsu and Reiley, Dan J. and Roberts, Mitsuko and Gunn, James E. and Loomis, Craig P. and Lupton, Robert H. and Siddiqui, Hassan and Murray, Graham J. and Ferreira, Decio and dos Santos, Leandro H. and de Oliveira, Ligia S. and de Oliveira, Antonio Cesar and Marrara Souza, Lucas and Tamura, Naoyuki and Moritani, Yuki and Takato, Naruhisa (2020) Prime Focus Spectrograph (PFS): the prime focus instrument. In: Ground-based and Airborne Instrumentation for Astronomy VIII. Proceedings of SPIE. No.11447. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 114477V. ISBN 9781510636811.

[img] PDF - Published Version
See Usage Policy.

[img] PDF (Conference Poster) - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


The Prime Focus Spectrograph (PFS) is a new optical/near-infrared multi-fiber spectrograph design for the prime focus of the 8.2m Subaru telescope. PFS will cover 1.3 degrees diameter field with 2394 fibers to complement the imaging capability of Hyper SuprimeCam (HSC). The prime focus unit of PFS called Prime Focus Instrument (PFI) provides the interface with the top structure of Subaru telescope and also accommodates the optical bench in which Cobra fiber positioners and fiducial fibers are located. In addition, the acquisition and guiding cameras (AGCs), the cable wrapper, the fiducial fiber illuminator, and viewer, the field element, and the telemetry system are located inside the PFI. The mechanical structure of the PFI was designed with special care such that its deflections sufficiently match those of the HSC’s Wide Field Corrector (WFC) so the fibers will stay on targets over the course of the observations within the required accuracy. The delivery of PFI components started in 2017. After the verification of these components, the mechanical structure of the PFI is fully assembled in early 2019 and all Cobra positioners are integrated in summer 2020. A temperature controlled chamber with precise x-y scanner was setup for the verification of the fiber positioners. The testing of the target convergence performance of Cobra positioners is now in progress.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Lupton, Robert H.0000-0003-1666-0962
Ferreira, Decio0000-0003-3243-9774
Additional Information:© 2020 Society of Photo-Optical Instrumentation Engineers (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, Technology and Innovation (Japan)UNSPECIFIED
Academia SinicaUNSPECIFIED
Subject Keywords:Prime Focus, mechanical structure, guiding camera, multi-fiber, spectrograph
Series Name:Proceedings of SPIE
Issue or Number:11447
Record Number:CaltechAUTHORS:20201222-151234588
Persistent URL:
Official Citation:Shiang-Yu Wang, Pin-Jie Huang, Hsin-Yo Chen, Masahiko Kimura, Chih-Yi Wen, Chi-Hung Yan, Jennifer Karr, Richard C. Y. Chou, Yin-Chang Chang, Shu-Fu Hsu, Yen-Shan Hu, Hung-Hsu Ling, Dan J. Reiley, Mitsuko Roberts, James E. Gunn, Craig Loomis, Robert H. Lupton, Hassan Siddiqui, Graham J. Murray, Decio Ferreira, Leandro Henrique dos Santos, Ligia Souza Oliveira, Antonio Cesar de Oliveira, Lucas Souza Marrara, Naoyuki Tamura, Yuki Moritani, and Naruhisa Takato "Prime Focus Spectrograph (PFS): the prime focus instrument", Proc. SPIE 11447, Ground-based and Airborne Instrumentation for Astronomy VIII, 114477V (13 December 2020);
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:107262
Deposited By: Tony Diaz
Deposited On:22 Dec 2020 23:24
Last Modified:16 Nov 2021 19:01

Repository Staff Only: item control page