Parameter-Space Survey of Linear G-mode and Interchange in Extended Magnetohydrodynamics

Howell, E. C.; Sovinec, C. R.

doi:10.1063/1.4993440

Parameter-Space Survey of Linear G-mode and Interchange in Extended Magnetohydrodynamics

Journal Article · Mon Sep 11 00:00:00 EDT 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4993440· OSTI ID:1390175

Howell, E. C. ^[1]; Sovinec, C. R. ^[2]

Univ. of Wisconsin, Madison, WI (United States). Dept. of Engineering Physics; Office of Science, Fusion Energy Sciences
Univ. of Wisconsin, Madison, WI (United States). Dept. of Engineering Physics

The extended magnetohydrodynamic stability of interchange modes is studied in two configurations. In slab geometry, a local dispersion relation for the gravitational interchange mode (g-mode) with three different extensions of the MHD model [P. Zhu, et al., Phys. Rev. Lett. 101, 085005 (2008)] is analyzed. Our results delineate where drifts stablize the g-mode with gyroviscosity alone and with a two-fluid Ohm’s law alone. Including the two-fluid Ohm’s law produces an ion drift wave that interacts with the g-mode. This interaction then gives rise to a second instability at finite k_y. A second instability is also observed in numerical extended MHD computations of linear interchange in cylindrical screw-pinch equilibria, the second configuration. Particularly with incomplete models, this mode limits the regions of stability for physically realistic conditions. But, applying a consistent two-temperature extended MHD model that includes the diamagnetic heat flux density ($$\vec{q}$$_*) makes the onset of the second mode occur at larger Hall parameter. For conditions relevant to the SSPX experiment [E.B. Hooper, Plasma Phys. Controlled Fusion 54, 113001 (2012)], significant stabilization is observed for Suydam parameters as large as unity (D_s≲1).

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Wisconsin, Madison, WI (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Grant/Contract Number:: FC02-05ER54813; FC02-08ER54975; FG02-06ER54850

OSTI ID:: 1390175

Alternate ID(s):: OSTI ID: 1436977
OSTI ID: 1395917

Report Number(s):: UW-CPTC 17--5

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 10 Vol. 24; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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