Role of electron inertia and electron/ion finite Larmor radius effects in low-beta, magneto-Rayleigh-Taylor instability

Srinivasan, Bhuvana; Hakim, A.

doi:10.1063/1.5046098

Role of electron inertia and electron/ion finite Larmor radius effects in low-beta, magneto-Rayleigh-Taylor instability

Journal Article · Wed Sep 19 00:00:00 EDT 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5046098· OSTI ID:1618115

^[1]; Hakim, A. ^[2]

Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States); Virginia Tech
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

The magneto-Rayleigh-Taylor (MRT) instability has been explored in great detail in previous work using magnetohydrodynamic and kinetic models for low-beta plasmas. The work presented here extends previous studies of this instability to regimes where finite-Larmor-Radius (FLR) effects may be important. Comparisons of the MRT instability are made using a 5-moment and a 10-moment two-fluid model, the two fluids being ions and electrons. The 5-moment model includes Hall stabilization, whereas the 10-moment model includes Hall and FLR stabilization. Results are presented for these two models using different electron mass to understand the role of electron iner- tia in the late-time nonlinear evolution of the MRT instability. For the 5-moment model, the late- time nonlinear MRT evolution does not significantly depend on the electron inertia. Yet, when FLR stabilization is important, the 10-moment results show that a lower ion-to-electron mass ratio (i.e., larger electron inertia) under-predicts the energy in high-wavenumber modes due to larger FLR stabilization.

View Accepted Manuscript (DOE)

Research Organization:: Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)

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

Grant/Contract Number:: SC0016515

OSTI ID:: 1618115

Alternate ID(s):: OSTI ID: 1471443

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 9 Vol. 25; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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