Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Compact Rare-Earth Superconducting Cyclotron   The use of superconductivity is well-known as a method to increase the
average field of a cyclotron and thereby to allow a substantial reduction of
its size and mass. We present a compact high-field design for the first
superconducting cyclotron with rare-earth (holmium) poles. Our design supports
stable acceleration of protons to Ek = 70 MeV with no significant limit in beam
current, suitable for wide applications in ocular therapy, isotope production,
radiobiological studies and nuclear physics.

6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
2
The categories of this paper are: math
17
The categories of this paper are: q-fin