Ion heating and flow driven by an Instability found in Plasma Couette Flow. (arXiv:2103.12657v1 [physics.plasm-ph])
<a href="http://arxiv.org/find/physics/1/au:+Milhone_J/0/1/0/all/0/1">J. Milhone</a>, <a href="http://arxiv.org/find/physics/1/au:+Flanagan_K/0/1/0/all/0/1">K. Flanagan</a>, <a href="http://arxiv.org/find/physics/1/au:+Egedal_J/0/1/0/all/0/1">J. Egedal</a>, <a href="http://arxiv.org/find/physics/1/au:+Endrizzi_D/0/1/0/all/0/1">D. Endrizzi</a>, <a href="http://arxiv.org/find/physics/1/au:+Olson_J/0/1/0/all/0/1">J. Olson</a>, <a href="http://arxiv.org/find/physics/1/au:+Peterson_E/0/1/0/all/0/1">E.E. Peterson</a>, <a href="http://arxiv.org/find/physics/1/au:+Wright_J/0/1/0/all/0/1">J.C. Wright</a>, <a href="http://arxiv.org/find/physics/1/au:+Forest_C/0/1/0/all/0/1">C.B. Forest</a>
We present the first observation of instability in weakly magnetized,
pressure dominated plasma Couette flow firmly in the Hall regime. Strong Hall
currents couple to a low frequency electromagnetic mode that is driven by
high-$beta$ ($>1$) pressure profiles. Spectroscopic measurements show heating
(factor of 3) of the cold, unmagnetized ions via a resonant Landau damping
process. A linear theory of this instability is derived that predicts positive
growth rates at finite $beta$ and shows the stabilizing effect of very large
$beta$, in line with observations.
We present the first observation of instability in weakly magnetized,
pressure dominated plasma Couette flow firmly in the Hall regime. Strong Hall
currents couple to a low frequency electromagnetic mode that is driven by
high-$beta$ ($>1$) pressure profiles. Spectroscopic measurements show heating
(factor of 3) of the cold, unmagnetized ions via a resonant Landau damping
process. A linear theory of this instability is derived that predicts positive
growth rates at finite $beta$ and shows the stabilizing effect of very large
$beta$, in line with observations.
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