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Proceedings Paper

FOCCoS for Subaru PFS
Author(s): Antonio Cesar de Oliveira; Ligia Souza de Oliveira; Marcio V. de Arruda; Jesulino Bispo dos Santos; Lucas Souza Marrara; Vanessa Bawden de Paula Macanhan; João Batista de Carvalho Oliveira; Rodrigo de Paiva Vilaça; Tania Pereira Dominici; Laerte Sodré; Claudia Mendes de Oliveira; Hiroshi Karoji; Hajime Sugai; Atsushi Shimono; Naoyuki Tamura; Naruhisa Takato; Akitoshi Ueda
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Paper Abstract

The Fiber Optical Cable and Connector System (FOCCoS), provides optical connection between 2400 positioners and a set of spectrographs by an optical fibers cable as part of Subaru PFS instrument. Each positioner retains one fiber entrance attached at a microlens, which is responsible for the F-ratio transformation into a larger one so that difficulties of spectrograph design are eased. The optical fibers cable will be segmented in 3 parts at long of the way, cable A, cable B and cable C, connected by a set of multi-fibers connectors. Cable B will be permanently attached at the Subaru telescope. The first set of multi-fibers connectors will connect the cable A to the cable C from the spectrograph system at the Nasmith platform. The cable A, is an extension of a pseudo-slit device obtained with the linear disposition of the extremities of the optical fibers and fixed by epoxy at a base of composite substrate. The second set of multi-fibers connectors will connect the other extremity of cable A to the cable B, which is part of the positioner's device structure. The optical fiber under study for this project is the Polymicro FBP120170190, which has shown very encouraging results. The kind of test involves FRD measurements caused by stress induced by rotation and twist of the fiber extremity, similar conditions to those produced by positioners of the PFS instrument. The multi-fibers connector under study is produced by USCONEC Company and may connect 32 optical fibers. The tests involve throughput of light and stability after many connections and disconnections. This paper will review the general design of the FOCCoS subsystem, methods used to fabricate the devices involved and the tests results necessary to evaluate the total efficiency of the set.

Paper Details

Date Published: 24 September 2012
PDF: 14 pages
Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84464R (24 September 2012); doi: 10.1117/12.925745
Show Author Affiliations
Antonio Cesar de Oliveira, Lab. Nacional de Astrofísica (Brazil)
Ligia Souza de Oliveira, Lab. Nacional de Astrofísica (Brazil)
Marcio V. de Arruda, Lab. Nacional de Astrofísica (Brazil)
Jesulino Bispo dos Santos, Lab. Nacional de Astrofísica (Brazil)
Lucas Souza Marrara, Lab. Nacional de Astrofísica (Brazil)
Vanessa Bawden de Paula Macanhan, Lab. Nacional de Astrofísica (Brazil)
João Batista de Carvalho Oliveira, Lab. Nacional de Astrofísica (Brazil)
Rodrigo de Paiva Vilaça, Lab. Nacional de Astrofísica (Brazil)
Tania Pereira Dominici, Lab. Nacional de Astrofísica (Brazil)
Laerte Sodré, Univ. de São Paulo (Brazil)
Claudia Mendes de Oliveira, Univ. de São Paulo (Brazil)
Hiroshi Karoji, Kavli Institute for the Physics and Mathematics of the Universe, The Univ. of Tokyo (Japan)
Hajime Sugai, Kavli Institute for the Physics and Mathematics of the Universe, The Univ. of Tokyo (Japan)
Atsushi Shimono, Kavli Institute for the Physics and Mathematics of the Universe, The Univ. of Tokyo (Japan)
Naoyuki Tamura, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Naruhisa Takato, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Akitoshi Ueda, Subaru Telescope, National Astronomical Observatory of Japan (United States)


Published in SPIE Proceedings Vol. 8446:
Ground-based and Airborne Instrumentation for Astronomy IV
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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