Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Anisotropic Inverse Cascade toward Zonal Flow in Magnetically Confined
  Plasmas   We propose a new mechanism for the generation of zonal flows in magnetically
confined plasmas, complementing previous theories based on a modulational
instability. We derive a new conservation law that operates in the regime of
weakly nonlinear dynamics, and show that it serves to focus the inverse cascade
of turbulent drift wave energy into zonal flows. This mechanism continues to
operate in the absence of the separation of dynamical scales typically assumed
in instability calculations.

31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg