Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic instability in a dilute circular rarefaction wave   The generation of a magnetic field in a circular rarefaction wave is examined
in form of a 2D particle-in-cell (PIC) simulation. Electrons with a temperature
of 32 keV are uniformly distributed within a cloud with a radius of 14.2
electron skin depths. They expand under their thermal pressure and carry with
them the cold protons, which are initially concentrated in a hollow ring at the
boundary of the electron cloud. The interior of the ring contains an immobile
positive charge background that compensates for the electron charge. The
protons expand in form of a circularly symmetric rarefaction wave and they
extract energy from the electrons. A thermal anisotropy of the electrons
develops and triggers through a Weibel-type instability the growth of TM waves
within the plasma cloud, which acts as a wave guide. The changing cross section
of this waveguide introduces a coupling between the TM wave and a TE wave and
in-plane magnetic fields grow. The relevance of the simulation results to a
previous experimental study of a laser-ablated wire is discussed.

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The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
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The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat