Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evolution of an arched magnetized laboratory plasma in a sheared
  magnetic field   Arched magnetized structures are a common occurrence in space and laboratory
plasmas. Results from a laboratory experiment on spatio-temporal evolution of
an arched magnetized plasma ($\beta \approx 10^{-3}$, Lundquist number $\approx
10^{4}$, plasma radius/ion gyroradius $\approx 20$) in a sheared magnetic
configuration are presented. The experiment is designed to model conditions
relevant to the formation and destabilization of similar structures in the
solar atmosphere. The magnitude of a nearly horizontal overlying magnetic field
was varied to study its effects on the writhe and twist of the arched plasma.
In addition, the direction of guiding magnetic field was varied to investigate
its role in formation of either forward- or reverse-S shaped plasma structures.
The electrical current in the arched plasma was well below the current required
to make it kink unstable. A significant increase in the writhe of the arched
plasma was observed with larger magnitudes of overlying magnetic field.
Forward-S shaped arched plasma was observed for a guiding magnetic field
oriented nearly anti-parallel to the initial arched plasma current, while the
parallel orientation yielded the reverse-S shaped arched plasma.

20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: alg-geom
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con