Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electron Acceleration by a Bichromatic Chirped Laser Pulse in Underdense
  Plasmas   A theoretical study of laser and plasma based electron acceleration is
presented. An effective model has been used, in which the presence of an
underdense plasma has been taken account via its index of refraction $n_{m}$.
In the confines of this model, the basic phenomena can be studied by
numerically solving the classical relativistic equations of motion. The key
idea of this paper is the application of chirped, bichromatic laser fields. We
investigated the advantages and disadvantages of mixing the second harmonic to
the original $\lambda = 800 \, \mathrm{nm}$ wavelength pulse. We performed
calculations both for plane wave and Gaussian pulses.

14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg