Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coherent Synchrotron Radiation in Whispering Gallery Modes: Theory and
  Evidence   Theory predicts that Coherent Synchrotron Radiation (CSR) in electron storage
rings should appear in whispering gallery modes. In an idealized model these
are resonances of the vacuum chamber that are characterized by their high
frequencies and concentration of the field near the outer wall of the chamber.
  The resonant modes imply a series of sharp peaks in the frequency spectrum of
CSR, and very long wake fields which lead to interbunch communication.
  Theory and experimental evidence for this behavior will be reviewed.

1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th