Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: General features of experiments on the dynamics of laser-driven
  electron-positron beams   The experimental study of the dynamics of neutral electron-positron beams is
an emerging area of research, enabled by the recent results on the generation
of this exotic state of matter in the laboratory. Electron-positron beams and
plasmas are believed to play a major role in the dynamics of extreme
astrophysical objects such as supermassive black holes and pulsars. For
instance, they are believed to be the main constituents of a large number of
astrophysical jets, and they have been proposed to significantly contribute to
the emission of gamma-ray bursts and their afterglow. However, despite
extensive numerical modelling and indirect astrophysical observations, a
detailed experimental characterisation of the dynamics of these objects is
still at its infancy. Here, we will report on some of the general features of
experiments studying the dynamics of electron-positron beams in a fully
laser-driven setup.

22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat