Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: LOTUS: A low cost, ultraviolet spectrograph   We describe the design, construction and commissioning of LOTUS; a simple,
low-cost long-slit spectrograph for the Liverpool Telescope. The design is
optimized for near-UV and visible wavelengths and uses all transmitting optics.
It exploits the instrument focal plane field curvature to partially correct
axial chromatic aberration. A stepped slit provides narrow (2.5x95 arcsec) and
wide (5x25 arcsec) options that are optimized for spectral resolution and flux
calibration respectively. On sky testing shows a wavelength range of 3200-6300
Angstroms with a peak system throughput (including detector quantum efficiency)
of 15 per cent and wavelength dependant spectral resolution of R=225-430. By
repeated observations of the symbiotic emission line star AG Peg we demonstrate
the wavelength stability of the system is less than 2 Angstroms rms and is
limited by the positioning of the object in the slit. The spectrograph is now
in routine operation monitoring the activity of comet 67P/Churyumov-Gerasimenko
during its current post-perihelion apparition.

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The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: eess
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The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
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The categories of this paper are: econ
31
The categories of this paper are: ao-sci
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The categories of this paper are: funct-an
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The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
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The categories of this paper are: hep-lat
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The categories of this paper are: solv-int
1
The categories of this paper are: cs
2
The categories of this paper are: math