Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Linear simulation of ion temperature gradient driven instabilities in
  W7-X and LHD stellarators using GTC   The global gyrokinetic toroidal code (GTC) has been recently upgraded to do
simulations in non-axisymmetric equilibrium configuration, such as
stellarators. Linear simulation of ion temperature gradient (ITG) driven
instabilities has been done in Wendelstein7-X (W7-X) and Large Helical Device
(LHD) stellarators using GTC. Several results are discussed to study
characteristics of ITG in stellarators, including toroidal grids convergence,
nmodes number convergence, poloidal and parallel spectrums, and electrostatic
potential mode structure on flux surface.

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The categories of this paper are: nlin
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The categories of this paper are: stat
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-th
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The categories of this paper are: bayes-an
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The categories of this paper are: eess
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: q-alg
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The categories of this paper are: adap-org
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The categories of this paper are: acc-phys
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The categories of this paper are: mtrl-th