Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cyclotrons for Particle Therapy   In particle therapy with protons a cyclotron is one of the most used particle
accelerators. Here it will be explained how a cyclotron works, some beam
dynamics aspects, its major subsystems, as well as the advantages and
disadvantages of a cyclotron for this application are discussed. The difference
between the standard isochronous cyclotron and the synchrocyclotron is
explained. New developments are presented and especially those which aim to
reduce the size of the accelerator.

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The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ