Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Self-acceleration and energy channeling in the saturation of the
  ion-sound instability in a bounded plasma   A novel regime of the saturation of the Pierce-type ion-sound instability in
bounded ion-beam-plasma system is revealed in 1D PIC simulations. It is found
that the saturation of the instability is mediated by the oscillating virtual
anode potential structure. The periodically oscillating potential barrier
separates the incoming beam ions into two groups. One component forms a
supersonic beam which is accelerated to an energy exceeding the energy of the
initial cold ion beam. The other component is organized as a self-consistent
phase space structure of trapped ions with a wide energy spread - the ion hole.
The effective temperature (energy spread) of the ions trapped in the hole is
lower than the initial beam energy. In the final stage the ion hole expands
over the whole system length.

34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin