Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electromagnetic effects in the stabilization of turbulence by sheared
  flow   We have extended our study of the competition between the drive and
stabilization of plasma microinstabilities by sheared flow to include
electromagnetic effects at low plasma $\beta$ (the ratio of plasma to magnetic
pressure). The extended system of characteristic equations is formulated, for a
dissipative fluid model developed from the gyrokinetic equation, using a
twisting mode representation in sheared slab geometry and focusing on the ion
temperature gradient mode. Perpendicular flow shear convects perturbations
along the field at the speed we denote as $Mc_s$ (where $c_s$ is the sound
speed). $M > 1/ \sqrt{\beta}$ is required to make the system characteristics
unidirectional and inhibit eigenmode formation, leaving only transitory
perturbations in the system. This typically represents a much larger flow shear
than in the electrostatic case, which only needs $M>1$. Numerical investigation
of the region $M < 1/\sqrt{\beta}$ shows the driving terms can conflict, as in
the electrostatic case, giving low growth rates over a range of parameters.
Also, at modest drive strengths and low $\beta$ values typical of experiments,
including electromagnetic effects does not significantly alter the growth
rates. For stronger flow shear and higher $\beta$, geometry characteristic of
the spherical tokamak mitigates the effect of an instability of the shear
Alfv\'{e}n wave, driven by the parallel flow shear.

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The categories of this paper are: supr-con
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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-fin
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The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: chao-dyn
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The categories of this paper are: eess
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The categories of this paper are: acc-phys
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The categories of this paper are: alg-geom
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The categories of this paper are: quant-ph
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The categories of this paper are: funct-an
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The categories of this paper are: astro-ph
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The categories of this paper are: q-alg
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The categories of this paper are: adap-org