Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: HAWC High Energy Upgrade with a Sparse Outrigger Array   The High Altitude Water Cherenkov (HAWC) gamma-ray observatory consists of
300 water Cherenkov detectors and has been fully operational since March 2015
in central Mexico. It detects cosmic- and gamma-ray showers in the TeV energy
range. For multi-TeV energies, the shower reconstruction and hence the
performance of the detector is affected by the partial containment of the
showers within the array. To improve the sensitivity at the highest energies,
HAWC is being upgraded with an outrigger array. It consists of 350 comparably
much smaller water Cherenkov detectors, sparsely distributed around the HAWC
main array. It will increase the instrumented area by a factor of 4-5. In this
contribution, we will present the current status of the upgrade as well as
simulation results on anticipated improvements in the performance of the
observatory.

25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph