Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Amplification due to Two-Stream Instability of Self-Electric and
  Magnetic Fields of an Ion Beam Propagating in Background Plasma   Propagation of charged particle beams in background plasma as a method of
space charge neutralization has been shown to achieve a high degree of charge
and current neutralization and therefore enables nearly ballistic propagation
and focusing of charged particle beams. Correspondingly, use of plasmas for
propagation of charged particle beams has important applications for transport
and focusing of intense particle beams in inertial fusion and high energy
density laboratory plasma physics. However, the streaming of beam ions through
a background plasma can lead to development of the two-stream instability
between the beam ions and the plasma electrons. The beam electric and magnetic
fields enhanced by the two-stream instability can lead to defocusing of the ion
beam. Using particle-in-cell (PIC) simulations, we study the scaling of the
instability-driven self-electromagnetic fields and consequent defocusing forces
with the background plasma density and beam ion mass. We identify plasma
parameters where the defocusing forces can be reduced.

29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs