Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Collision frequency dependence of polarization current in neoclassical
  tearing modes   The neoclassical polarization current, generated when a magnetic island
propagates through a tokamak plasma, is believed to influence the initial stage
of the neoclassical tearing mode evolution. Understanding the strength of its
contribution in the relevant plasma collision frequency regimes for future
tokamaks such as ITER is crucial for the successful control and/or avoidance of
the neoclassical tearing mode. A nonlinear drift kinetic theory is employed to
determine the full collision frequency dependence of the neoclassical
polarization current in the small island limit, comparable to the trapped ion
orbit width. Focusing on the region away from the island separatrix (where a
layer with a complex mix of physics processes exists), we evaluate for the
first time the variation of the neoclassical ion polarization current in the
transition regime between the analytically tractable collisionless and
collisional limits. In addition, the island propagation frequency-dependence of
the neoclassical polarization current and its contribution to the island
evolution is revealed. For a range of propagation frequencies, we find that the
neoclassical polarization current is a maximum in the intermediate collision
frequency regime analyzed here - a new and unexpected result.

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The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
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The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an