Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electron Modulation Instability in the Strong Turbulent Regime for
  Electron Beam Propagation in Background Plasma   We study collective processes for an electron beam propagating through a
background plasma using simulations and analytical theory. A new regime where
the instability of a Langmuir wave packet can grow locally much faster than ion
frequency ({\omega}_pi) is clearly identified. The key feature of this new
regime is an Electron Modulational Instability that rapidly creates a local
Langmuir wave packet, which in its turn produces local charge separation and
strong ion density perturbations because of the action of the ponderomotive
force, such that the beam-plasma wave interaction stops being resonant. Three
evolution stages of the process and observed periodic burst features are
discussed. Different physical regimes in the plasma and beam parameter space
are clearly demonstrated for the first time.

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The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol