Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multi-scale magnetic field structures in an expanding elongated plasma
  cloud with hot electrons subject to an external magnetic field   We carry out 3D and 2D PIC-simulations of the expansion of a magnetized
plasma that initially uniformly fills a half-space and contains a
semi-cylindrical region of heated electrons elongated along the surface of the
plasma boundary. This geometry is related, for instance, to the ablation of a
plane target by a femtosecond laser beam under quasi-cylindrical focusing. We
find that the decay of the inhomogeneous plasma--vacuum discontinuity is
strongly affected by an external magnetic field parallel to its boundary.
  We observe various transient phenomena, including the anisotropic scattering
of electrons and the accompanying Weibel instability, and reveal various
spatial structures of the arising magnetic field and current, including
multiple flying apart filaments of a z-pinch type and slowly evolving current
sheets with different orientations. The magnitude of the self-generated
magnetic field can be of the order of or significantly exceed that of the
external one. Such phenomena are expected in the laser and cosmic plasmas,
including the explosive processes in the planetary magnetospheres and stellar
coronal arches.

37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th