8 July 2014 Progress with the Prime Focus Spectrograph for the Subaru Telescope: a massively multiplexed optical and near-infrared fiber spectrograph
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Abstract
The Prime Focus Spectrograph (PFS) is an optical/near-infrared multi-fiber spectrograph with 2394 science fibers, which are distributed in 1.3 degree diameter field of view at Subaru 8.2-meter telescope. The simultaneous wide wavelength coverage from 0.38 μm to 1.26 μm, with the resolving power of 3000, strengthens its ability to target three main survey programs: cosmology, Galactic archaeology, and galaxy/AGN evolution. A medium resolution mode with resolving power of 5000 for 0.71 μm to 0.89 μm also will be available by simply exchanging dispersers. PFS takes the role for the spectroscopic part of the Subaru Measurement of Images and Redshifts (SuMIRe) project, while Hyper Suprime-Cam (HSC) works on the imaging part. HSC’s excellent image qualities have proven the high quality of the Wide Field Corrector (WFC), which PFS shares with HSC. The PFS collaboration has succeeded in the project Preliminary Design Review and is now in a phase of subsystem Critical Design Reviews and construction. To transform the telescope plus WFC focal ratio, a 3-mm thick broad-band coated microlens is glued to each fiber tip. The microlenses are molded glass, providing uniform lens dimensions and a variety of refractive-index selection. After successful production of mechanical and optical samples, mass production is now complete. Following careful investigations including Focal Ratio Degradation (FRD) measurements, a higher transmission fiber is selected for the longest part of cable system, while one with a better FRD performance is selected for the fiber-positioner and fiber-slit components, given the more frequent fiber movements and tightly curved structure. Each Fiber positioner consists of two stages of piezo-electric rotary motors. Its engineering model has been produced and tested. After evaluating the statistics of positioning accuracies, collision avoidance software, and interferences (if any) within/between electronics boards, mass production will commence. Fiber positioning will be performed iteratively by taking an image of artificially back-illuminated fibers with the Metrology camera located in the Cassegrain container. The camera is carefully designed so that fiber position measurements are unaffected by small amounts of high special-frequency inaccuracies in WFC lens surface shapes. Target light carried through the fiber system reaches one of four identical fast-Schmidt spectrograph modules, each with three arms. All optical glass blanks are now being polished. Prototype VPH gratings have been optically tested. CCD production is complete, with standard fully-depleted CCDs for red arms and more-challenging thinner fully-depleted CCDs with blue-optimized coating for blue arms. The active damping system against cooler vibration has been proven to work as predicted, and spectrographs have been designed to avoid small possible residual resonances.
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Hajime Sugai, Hajime Sugai, Naoyuki Tamura, Naoyuki Tamura, Hiroshi Karoji, Hiroshi Karoji, Atsushi Shimono, Atsushi Shimono, Naruhisa Takato, Naruhisa Takato, Masahiko Kimura, Masahiko Kimura, Youichi Ohyama, Youichi Ohyama, Akitoshi Ueda, Akitoshi Ueda, Hrand Aghazarian, Hrand Aghazarian, Marcio Vital de Arruda, Marcio Vital de Arruda, Robert H. Barkhouser, Robert H. Barkhouser, Charles L. Bennett, Charles L. Bennett, Steve Bickerton, Steve Bickerton, Alexandre Bozier, Alexandre Bozier, David F. Braun, David F. Braun, Khanh Bui, Khanh Bui, Christopher M. Capocasale, Christopher M. Capocasale, Michael A. Carr, Michael A. Carr, Bruno Castilho, Bruno Castilho, Yin-Chang Chang, Yin-Chang Chang, Hsin-Yo Chen, Hsin-Yo Chen, Richard C. Y. Chou, Richard C. Y. Chou, Olivia R. Dawson, Olivia R. Dawson, Richard G. Dekany, Richard G. Dekany, Eric M. Ek, Eric M. Ek, Richard S. Ellis, Richard S. Ellis, Robin J. English, Robin J. English, Didier Ferrand, Didier Ferrand, Décio Ferreira, Décio Ferreira, Charles D. Fisher, Charles D. Fisher, Mirek Golebiowski, Mirek Golebiowski, James E. Gunn, James E. Gunn, Murdock Hart, Murdock Hart, Timothy M. Heckman, Timothy M. Heckman, Paul T. P. Ho, Paul T. P. Ho, Stephen Hope, Stephen Hope, Larry E. Hovland, Larry E. Hovland, Shu-Fu Hsu, Shu-Fu Hsu, Yen-Sang Hu, Yen-Sang Hu, Pin Jie Huang, Pin Jie Huang, Marc Jaquet, Marc Jaquet, Jennifer E. Karr, Jennifer E. Karr, Jason G. Kempenaar, Jason G. Kempenaar, Matthew E. King, Matthew E. King, Olivier Le Fèvre, Olivier Le Fèvre, David Le Mignant, David Le Mignant, Hung-Hsu Ling, Hung-Hsu Ling, Craig Loomis, Craig Loomis, Robert H. Lupton, Robert H. Lupton, Fabrice Madec, Fabrice Madec, Peter Mao, Peter Mao, Lucas Souza Marrara, Lucas Souza Marrara, Brice Ménard, Brice Ménard, Chaz Morantz, Chaz Morantz, Hitoshi Murayama, Hitoshi Murayama, Graham J. Murray, Graham J. Murray, Antonio Cesar de Oliveira, Antonio Cesar de Oliveira, Claudia Mendes de Oliveira, Claudia Mendes de Oliveira, Ligia Souza de Oliveira, Ligia Souza de Oliveira, Joe D. Orndorff, Joe D. Orndorff, Rodrigo de Paiva Vilaça, Rodrigo de Paiva Vilaça, Eamon J. Partos, Eamon J. Partos, Sandrine Pascal, Sandrine Pascal, Thomas Pegot-Ogier, Thomas Pegot-Ogier, Daniel J. Reiley, Daniel J. Reiley, Reed Riddle, Reed Riddle, Leandro Santos, Leandro Santos, Jesulino Bispo dos Santos, Jesulino Bispo dos Santos, Mark A. Schwochert, Mark A. Schwochert, Michael D. Seiffert, Michael D. Seiffert, Stephen A. Smee, Stephen A. Smee, Roger M. Smith, Roger M. Smith, Ronald E. Steinkraus, Ronald E. Steinkraus, Laerte Sodré, Laerte Sodré, David N. Spergel, David N. Spergel, Christian Surace, Christian Surace, Laurence Tresse, Laurence Tresse, Clément Vidal, Clément Vidal, Sebastien Vives, Sebastien Vives, Shiang-Yu Wang, Shiang-Yu Wang, Chih-Yi Wen, Chih-Yi Wen, Amy C. Wu, Amy C. Wu, Rosie Wyse, Rosie Wyse, Chi-Hung Yan, Chi-Hung Yan, } "Progress with the Prime Focus Spectrograph for the Subaru Telescope: a massively multiplexed optical and near-infrared fiber spectrograph", Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91470T (8 July 2014); doi: 10.1117/12.2054294; https://doi.org/10.1117/12.2054294
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