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Prime Focus Spectrograph for the Subaru telescope : massively multiplexed optical and near-infrared fiber spectrograph.

Sugai, H. and Tamura, N. and Karoji, H. and Shimono, A. and Takato, N. and Kimura, M. and Ohyama, Y. and Ueda, A. and Aghazarian, H. and de Arruda, M.V. and Barkhouser, R.H. and Bennett, C.L. and Bickerton, S. and Bozier, A. and Braun, D.F. and Bui, K. and Capocasale, C.M. and Carr, M.A. and Castilho, B. and Chang, Y.-C. and Chen, H.-Y. and Chou, R.C.Y. and Dawson, O.R. and Dekany, R.G. and Ek, E.M. and Ellis, R.S. and English, R.J. and Ferrand, D. and Ferreira, D. and Fisher, C.D. and Golebiowski, M. and Gunn, J.E. and Hart, M. and Heckman, T.M. and Ho, P.T.P. and Hope, S. and Hovland, L.E. and Hsu, S.-F. and Hu, Y.-S. and Huang, P.J. and Jaquet, M. and Karr, J.E. and Kempenaar, J.G. and King, M.E. and Fèvre, O.L. and Mignant, D.L. and Ling, H.-H. and Loomis, C. and Lupton, R.H. and Madec, F. and Mao, P. and Marrara, L.S. and Ménard, B. and Morantz, C. and Murayama, H. and Murray, G.J. and de Oliveira, A.C. and de Oliveira, C.M. and de Oliveira, L.S. and Orndorff, J.D. and de Paiva Vila\c ca, R. and Partos, E.J. and Pascal, S. and Pegot-Ogier, T. and Reiley, D.J. and Riddle, R. and Santos, L. and dos Santos, J.B. and Schwochert, M.A. and Seiffert, M.D. and Smee, S.A. and Smith, R.M. and Steinkraus, R.E. and Sodré, L. and Spergel, D.N. and Surace, C. and Tresse, L. and Vidal, C. and Vives, S. and Wang, S.-Y. and Wen, C.-Y. and Wu, A.C. and Wyse, R. and Yan, C.-H. (2015) 'Prime Focus Spectrograph for the Subaru telescope : massively multiplexed optical and near-infrared fiber spectrograph.', Journal of astronomical telescopes, instruments, and systems., 1 (3). 035001.


he 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  μm0.38  μm to 1.26  μm1.26  μm, 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  μm0.71  μm to 0.89  μm0.89  μm 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.

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Publisher statement:© The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
Date accepted:22 May 2015
Date deposited:21 June 2016
Date of first online publication:23 June 2015
Date first made open access:No date available

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