Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Numerical analysis of azimuthal rotating spokes in a crossed-field
  discharge plasma   Low-frequency rotating spokes are obtained in a cross-field discharge plasma
using two-dimensional numerical simulations. A particle-fluid hybrid model is
used to model the plasma flow in a configuration similar to a Hall thruster. It
has been reported that the drift-diffusion approximation for an electron fluid
results in an ill-conditioned matrix when solving for the potential because of
the differences in the electron mobilities across the magnetic field and in the
direction of the E$\times$B drift. In this paper, we employ a hyperbolic
approach that enables stable calculation, namely, better iterative convergence
of the electron fluid model. Our simulation results show a coherent rotating
structure propagating in the E$\times$B direction with a phase velocity of
2,500 m/s, which agrees with experimental data. The phase velocity obtained
from the numerical simulations shows good agreement with that predicted by the
dispersion relation of the gradient drift instability.

26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
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The categories of this paper are: acc-phys
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The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
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The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
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The categories of this paper are: cmp-lg