Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radioactive Ion Sources   This chapter provides an overview of the basic requirements for ion sources
designed and operated in radioactive ion beam facilities. The facilities where
these sources are operated exploit the isotope separation online (ISOL)
technique, in which a target is combined with an ion source to maximize the
secondary beam intensity and chemical element selectivity. Three main classes
of sources are operated, namely surface-type ion sources, arc discharge-type
ion sources, and finally radio-frequency-heated plasma-type ion sources.

28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th