Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Trigger System of the H.E.S.S. Telescope Array   H.E.S.S. -- The High Energy Stereoscopic System-- is a new system of large
atmospheric Cherenkov telescopes for GeV/TeV Gamma-ray astronomy. This paper
describes the trigger system of H.E.S.S. with emphasis on the multi-telescope
array level trigger. The system trigger requires the simultaneous detection of
air-showers by several telescopes at the hardware level. This requirement
allows a suppression of background events which in turn leads to a lower system
energy threshold for the detection of Gamma-rays. The implementation of the
H.E.S.S. trigger system is presented along with data taken to characterise its
performance.

28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics