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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The MaNGA integral field unit fiber feed system for the sloan 2.5 m telescope
Astronomical Journal, Volume 149, No. 2, Article 77, Year 2015
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Description
We describe the design, manufacture, and performance of bare-fiber integral field units (IFUs) for the SDSS-IV survey Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) on the the Sloan 2.5 m telescope at Apache Point Observatory. MaNGA is a luminosity-selected integral-field spectroscopic survey of 104 local galaxies covering 360-1030 nm at R ∼ 2200. The IFUs have hexagonal dense packing of fibers with packing regularity of 3 μm (rms), and throughput of 96 ± 0.5% from 350 nm to 1 μm in the lab. Their sizes range from 19 to 127 fibers (3-7 hexagonal layers) using Polymicro FBP 120:132:150 μm core:clad:buffer fibers to reach a fill fraction of 56%. High throughput (and low focal-ratio degradation (FRD )) is achieved by maintaining the fiber cladding and buffer intact, ensuring excellent surface polish, and applying a multi-layer anti-reflection (AR) coating of the input and output surfaces. In operations on-sky, the IFUs show only an additional 2.3% FRD-related variability in throughput despite repeated mechanical stressing during plate plugging (however other losses are present). The IFUs achieve on-sky throughput 5% above the single-fiber feeds used in SDSS-III/BOSS, attributable to equivalent performance compared to single fibers and additional gains from the AR coating. The manufacturing process is geared toward mass-production of high-multiplex systems. The low-stress process involves a precision ferrule with a hexagonal inner shape designed to lead inserted fibers to settle in a dense hexagonal pattern. The ferrule ID is tapered at progressively shallower angles toward its tip and the final 2 mm are straight and only a few microns larger than necessary to hold the desired number of fibers. Our IFU manufacturing process scales easily to accommodate other fiber sizes and can produce IFUs with substantially larger fiber counts. To assure quality, automated testing in a simple and inexpensive system enables complete characterization of throughput and fiber metrology. Future applications include larger IFUs, higher fill factors with stripped buffer, decladding, and lenslet coupling. © 2015. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Drory, Niv
United States, Austin
The University of Texas at Austin
MacDonald, Nicholas K.
United States, Seattle
University of Washington
Bershady, Matthew A.
United States, Madison
University of Wisconsin-madison
Bundy, Kevin A.
Japan, Tokyo
The University of Tokyo
Gunn, James E.
United States, Princeton
Princeton University
Law, David R.
Canada, Toronto
University of Toronto
Smith, Michael P.
United States, Madison
University of Wisconsin-madison
Stoll, Robert
Unknown Affiliation
Tremonti, Christy A.
United States, Madison
University of Wisconsin-madison
Wake, David A.
United States, Madison
University of Wisconsin-madison
United Kingdom, Milton Keynes
The Open University
Yan, Renbin
United States, Lexington
University of Kentucky
Weijmans, Anne Marie
United Kingdom, St Andrews
University of st Andrews
Byler, Nell
United States, Seattle
University of Washington
Cherinka, Brian A.
Canada, Toronto
University of Toronto
Eigenbrot, Arthur Davis
United States, Madison
University of Wisconsin-madison
Harding, Paul
United States, Cleveland
Case Western Reserve University
Huehnerhoff, Joseph
United States, Sunspot
Apache Point Observatory
Klaene, Mark A.
United States, Sunspot
Apache Point Observatory
Percival, Jeffrey W.
United States, Madison
University of Wisconsin-madison
Sayres, Conor
United States, Seattle
University of Washington
Statistics
Citations: 332
Authors: 20
Affiliations: 11
Identifiers
Doi:
10.1088/0004-6256/149/2/77
ISSN:
00046256
Study Design
Cross Sectional Study
Study Approach
Quantitative