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

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

doi:10.1063/1.4993440

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

Journal Article · 11 September 2017 · Physics of Plasmas

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

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

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).

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

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

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

OSTI ID:: 1390175

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

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

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

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

Country of Publication:: United States

Language:: English

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

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