Two-temperature effects in Hall-MHD simulations of the HIT-SI experiment

Kaptanoglu, Alan A.; Benedett, Tom E.; Morgan, Kyle D.; Hansen, Chris J.; Jarboe, Thomas R.

doi:10.1063/5.0006311

Two-temperature effects in Hall-MHD simulations of the HIT-SI experiment

Journal Article · Tue Jul 14 00:00:00 EDT 2020 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0006311· OSTI ID:1638351

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Univ. of Washington, Seattle, WA (United States); University of Washington
Univ. of Washington, Seattle, WA (United States)
Univ. of Washington, Seattle, WA (United States); Columbia Univ., New York, NY (United States)

A two-temperature Hall-magnetohydrodynamic (Hall-MHD) model, which evolves the electron and ion temperatures separately, is implemented in the PSI-Tet 3D MHD code and used to model plasma dynamics in the Helicity Injected Torus–Steady Inductive (HIT-SI) experiment. The two-temperature model is utilized for HIT-SI simulations in both the PSI-Tet and NIMROD codes at a number of different injector frequencies in the 14.5–68.5 kHz range. At all frequencies, the NIMROD two-temperature model results in increased toroidal current, lower chord-averaged density, higher average temperatures, outward radial shift of the current centroid, and axial symmetrization of the current centroid, relative to the single-temperature NIMROD simulations. The two-temperature PSI-Tet model illustrates similar trends, but at high frequency operation, it exhibits lower electron temperature, smaller toroidal current, and decreased axial symmetrization with respect to the single-temperature PSI-Tet model. With all models, average temperatures and toroidal currents increase with the injector frequency. Power balance and heat fluxes to the wall are calculated for the two-temperature PSI-Tet model and illustrate considerable viscous and compressive heating, particularly at high injector frequency. Parameter scans are also presented for artificial diffusivity, wall temperature, and density. Both artificial diffusivity and the density boundary condition significantly modify the plasma density profiles, leading to larger average temperatures, toroidal current, and relative density fluctuations at low densities. As a result, a low density simulation achieves sufficiently high current gain (G > 5) to generate significant volumes of closed flux lasting 1–2 injector periods.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Washington, Seattle, WA (United States)

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

Grant/Contract Number:: AC02-05CH11231; FG02-96ER54361; SC0016256

OSTI ID:: 1638351

Alternate ID(s):: OSTI ID: 1638410

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 7 Vol. 27; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Two-temperature effects in Hall-MHD simulations of the HIT-SI experiment

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