Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Towards explanation of the two-frequency heating effect in electron
  cyclotron ion sources   The quasilinear model of electron cyclotron resonance (ECR) heating in a
mirror magnetic field predicts essential broadening of the electron
distribution function in case of bichromatic wave. This may stabilize kinetic
instabilities in the electron-cyclotron frequency range resulting in improved
performance of ECR ion sources, the effect which is observed in many
independent experiments.

20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex