Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stability and behavior of the outer array of small water Cherenkov
  detectors, outriggers, in the HAWC observatory   The High-Altitude Water Cherenkov (HAWC) Observatory is used for detecting
TeV gamma rays. HAWC is operating at 4,100 meters above level sea on the slope
of the Sierra Negra Volcano in the State of Puebla, Mexico, and consists of an
array of 300 water Cherenkov detectors (WCDs) covering an area of 22,000 $m^2$.
Each WCD is equipped with four photomultiplier tubes (PMTs) to detect Cherenkov
emission in the water from secondary particles of extensive air-shower (EAS)
that are produced in the interactions of primary particles (gamma rays or
charged cosmic rays) in the atmosphere. HAWC is able to reconstruct the EAS in
the 0.5 to 100 TeV energy range. In order to improve the core determination for
events with high energy ($>10$ TeV) when the events arrive outside of the HAWC
array, the Outrigger upgrade project is adding 350 small WCDs around the main
array. These outrigger tanks each have one PMT in a 1.5 meter diameter
cylindrical polyethylene tank, covering a total area four times larger than
that of the HAWC array. In this work we present leak light testing to identify
the stability of the detector and an analysis of deposited charges to
understand the detector performance.

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The categories of this paper are: nlin
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The categories of this paper are: mtrl-th
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The categories of this paper are: math
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The categories of this paper are: hep-lat
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The categories of this paper are: patt-sol
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The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
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The categories of this paper are: cs
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The categories of this paper are: plasm-ph
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The categories of this paper are: supr-con
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: nucl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ex
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The categories of this paper are: eess