Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Motion of particles in storage rings in the presence of a
  counterpropagating laser beam I   The dynamics of charged particle beams interacting with laser beams and
material targets in storage rings is presented. Formulas for the radiative
damping, quantum excitation and equilibrium parameters of ion and electron
beams determined by the backward rayleigh and backward compton scattering are
derived. General case is considered. It takes into account the possibility of
the periodical displacement of the laser beam in the radial direction with
varying velocity in the process of the interaction of the beams and includes
the possibility of the description of dynamics of muon beams interacting with
material targets in storage rings (enhanced ionization cooling). The example is
considered and some applications of being cooled beams are discussed.

17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph