Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Linear accelerators   Radio-frequency linear accelerators are used as injectors for synchrotrons
and as stand-alone accelerators for the production of intense particle beams,
thanks to their ability to accelerate high beam currents at high repetition
rates. This lecture introduces their main features, reviewing the different
types of accelerating structures used in linacs and presenting the main
characteristics of linac beam dynamics. Building on these bases, the
architecture of modern proton linear accelerators is presented with a
particular emphasis on high-energy and high-beam-power applications.

2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga