Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Collimation and acceleration of mono-energetic electron beams in Laser
  Plasma accelerators   Motivated by rapid advances in plasma based accelerators, we propose a simple
mechanism for the production of highly collimated quasi monochromatic electrons
beams. By considering Compton scattering of electrons (in the plasma) with
virtual photons -- through an effective interaction --- we demonstrate angular
collimation with a divergence less than 3 mrad quasi mono-energetic nature of
the beam and an energy gain of O (1 GeV/cm), in laser induced accelerators.

17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga