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27 April 2024

» arxiv » 1507.0725

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Prime Focus Spectrograph for the Subaru telescope: massively multiplexed optical and near-infrared fiber spectrograph
Hajime Sugai ; Naoyuki Tamura ; Hiroshi Karoji ; Atsushi Shimono ; Naruhisa Takato ; Masahiko Kimura ; Youichi Ohyama ; Akitoshi Ueda ; Hrand Aghazarian ; Marcio Vital de Arruda ; Robert H. Barkhouser ; Charles L. Bennett ; Steve Bickerton ; Alexandre Bozier ; David F. Braun ; Khanh Bui ; Christopher M. Capocasale ; Michael A. Carr ; Bruno Castilho ; Yin-Chang Chang ; Hsin-Yo Chen ; Richard C.Y. Chou ; Olivia R. Dawson ; Richard G. Dekany ; Eric M. Ek ; Richard S. Ellis ; Robin J. English ; Didier Ferrand ; Décio Ferreira ; Charles D. Fisher ; Mirek Golebiowski ; James E. Gunn ; Murdock Hart ; Timothy M. Heckman ; Paul T. P. Ho ; Stephen Hope ; Larry E. Hovland ; Shu-Fu Hsu ; Yen-Shan Hu ; Pin Jie Huang ; Marc Jaquet ; Jennifer E. Karr ; Jason G. Kempenaar ; Matthew E. King ; Olivier Le Fèvre ; David Le Mignant ; Hung-Hsu Ling ; Craig Loomis ; Robert H. Lupton ; Fabrice Madec ; Peter Mao ; Lucas Souza Marrara ; Brice Ménard ; Chaz Morantz ; Hitoshi Murayama ; Graham J. Murray ; Antonio Cesar de Oliveira ; Claudia Mendes de Oliveira ; Ligia Souza de Oliveira ; Joe D. Orndorff ; Rodrigo de Paiva Vilaça ; Eamon J. Partos ; Sandrine Pascal ; Thomas Pegot-Ogier ; Daniel J. Reiley ; Reed Riddle ; Leandro Santos ; Jesulino Bispo dos Santos ; Mark A. Schwochert ; Michael D. Seiffert ; Stephen A. Smee ; Roger M. Smith ; Ronald E. Steinkraus ; Laerte Sodré Jr ; David N. Spergel ; Christian Surace ; Laurence Tresse ; Clément Vidal ; Sebastien Vives ; Shiang-Yu Wang ; Chih-Yi Wen ; Amy C. Wu ; Rosie Wyse ; Chi-Hung Yan ;
Date:	2 Jul 2015
Abstract:	The Prime Focus Spectrograph (PFS) is an optical/near-infrared multifiber spectrograph with 2394 science fibers distributed across a 1.3-deg diameter field of view at the Subaru 8.2-m telescope. The wide wavelength coverage from 0.38 {mu}m to 1.26 {mu}m, with a resolving power of 3000, simultaneously strengthens its ability to target three main survey programs: cosmology, galactic archaeology and galaxy/AGN evolution. A medium resolution mode with a resolving power of 5000 for 0.71 {mu}m to 0.89 {mu}m will also be available by simply exchanging dispersers. We highlight some of the technological aspects of the design. To transform the telescope focal ratio, a broad-band coated microlens is glued to each fiber tip. A higher transmission fiber is selected for the longest part of the cable system, optimizing overall throughput; a fiber with low focal ratio degradation is selected for the fiber-positioner and fiber-slit components, minimizing the effects of fiber movements and fiber bending. Fiber positioning will be performed by a positioner consisting of two stages of piezo-electric rotary motors. The positions of these motors are measured by taking an image of artificially back-illuminated fibers with the metrology camera located in the Cassegrain container; the fibers are placed in the proper location by iteratively measuring and then adjusting the positions of the motors. Target light reaches one of the four identical fast-Schmidt spectrograph modules, each with three arms. The PFS project has passed several project-wide design reviews and is now in the construction phase.
Source:	arXiv, 1507.0725
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