Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Developments in high-density Cobra fiber positioners for the Subaru
  Telescope's Prime Focus Spectrograph   The Prime Focus Spectrograph (PFS) is a fiber fed multi-object spectrometer
for the Subaru Telescope that will conduct a variety of targeted surveys for
studies of dark energy, galaxy evolution, and galactic archaeology. The key to
the instrument is a high density array of fiber positioners placed at the prime
focus of the Subaru Telescope. The system, nicknamed "Cobra", will be capable
of rapidly reconfiguring the array of 2394 optical fibers to the image
positions of astronomical targets in the focal plane with high accuracy. The
system uses 2394 individual "SCARA robot" mechanisms that are 7.7mm in diameter
and use 2 piezo-electric rotary motors to individually position each of the
optical fibers within its patrol region. Testing demonstrates that the Cobra
positioner can be moved to within 5{\mu}m of an astronomical target in 6 move
iterations with a success rate of 95 per cent. The Cobra system is a key aspect
of PFS that will enable its unprecedented combination of high-multiplex factor
and observing efficiency on the Subaru telescope. The requirements, design, and
prototyping efforts for the fiber positioner system for the PFS are described
here as are the plans for modular construction, assembly, integration,
functional testing, and performance validation.

23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
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The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
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The categories of this paper are: nucl-ex
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The categories of this paper are: stat
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The categories of this paper are: q-bio
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The categories of this paper are: math
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The categories of this paper are: comp-gas
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The categories of this paper are: eess