Two-fluid biasing simulations of the large plasma device
Abstract
External biasing of the Large Plasma Device (LAPD) and its impact on plasma flows and turbulence are explored for the first time in 3D simulations using the Global Braginskii Solver code. Without external biasing, the LAPD plasma spontaneously rotates in the ion diamagnetic direction. The application of a positive bias increases the plasma rotation in the simulations, which show the emergence of a coherent Kelvin Helmholtz (KH) mode outside of the cathode edge with poloidal mode number $m≃6$. Negative biasing reduces the rotation in the simulations, which exhibit KH turbulence modestly weaker than but otherwise similar to unbiased simulations. Biasing either way, but especially positively, forces the plasma potential inside the cathode edge to a spatially constant, KH-stable profile, leading to a more quiescent core plasma than the unbiased case. A moderate increase in plasma confinement and an associated steepening of the profiles are seen in the biasing runs. The simulations thus show that the application of external biasing can improve confinement while also driving a Kelvin-Helmholtz instability. Ion-neutral collisions have only a weak effect in the biased or unbiased simulations.
- Authors:
-
[1];
- Department of Physics and Astronomy, Dartmouth College, Hanover, New Hampshire 03755, USA
- Publication Date:
- Research Org.:
- Univ. of New Hampshire, Durham, NH (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1361770
- Alternate Identifier(s):
- OSTI ID: 1349341; OSTI ID: 1535297
- Grant/Contract Number:
- FG02-10ER46372; FG02-07ER46372
- Resource Type:
- Published Article
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Name: Physics of Plasmas Journal Volume: 24 Journal Issue: 2; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; physics
Citation Formats
Fisher, Dustin M., and Rogers, Barrett N. Two-fluid biasing simulations of the large plasma device. United States: N. p., 2017.
Web. doi:10.1063/1.4975616.
Fisher, Dustin M., & Rogers, Barrett N. Two-fluid biasing simulations of the large plasma device. United States. https://doi.org/10.1063/1.4975616
Fisher, Dustin M., and Rogers, Barrett N. Wed .
"Two-fluid biasing simulations of the large plasma device". United States. https://doi.org/10.1063/1.4975616.
@article{osti_1361770,
title = {Two-fluid biasing simulations of the large plasma device},
author = {Fisher, Dustin M. and Rogers, Barrett N.},
abstractNote = {External biasing of the Large Plasma Device (LAPD) and its impact on plasma flows and turbulence are explored for the first time in 3D simulations using the Global Braginskii Solver code. Without external biasing, the LAPD plasma spontaneously rotates in the ion diamagnetic direction. The application of a positive bias increases the plasma rotation in the simulations, which show the emergence of a coherent Kelvin Helmholtz (KH) mode outside of the cathode edge with poloidal mode number $m≃6$. Negative biasing reduces the rotation in the simulations, which exhibit KH turbulence modestly weaker than but otherwise similar to unbiased simulations. Biasing either way, but especially positively, forces the plasma potential inside the cathode edge to a spatially constant, KH-stable profile, leading to a more quiescent core plasma than the unbiased case. A moderate increase in plasma confinement and an associated steepening of the profiles are seen in the biasing runs. The simulations thus show that the application of external biasing can improve confinement while also driving a Kelvin-Helmholtz instability. Ion-neutral collisions have only a weak effect in the biased or unbiased simulations.},
doi = {10.1063/1.4975616},
journal = {Physics of Plasmas},
number = 2,
volume = 24,
place = {United States},
year = {Wed Feb 08 00:00:00 EST 2017},
month = {Wed Feb 08 00:00:00 EST 2017}
}
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https://doi.org/10.1063/1.4975616
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Works referencing / citing this record:
Formation of spiral structures of turbulence driven by a strong rotation in magnetically cylindrical plasmas
journal, April 2019
- Sasaki, M.; Camenen, Y.; Escarguel, A.
- Physics of Plasmas, Vol. 26, Issue 4
On the nature of blob propagation and generation in the large plasma device: Global GRILLIX studies
journal, October 2019
- Ross, A.; Stegmeir, A.; Manz, P.
- Physics of Plasmas, Vol. 26, Issue 10
On the Importance of Spatial and Velocity Resolution in the Hybrid-Vlasov Modeling of Collisionless Shocks
journal, May 2018
- Pfau-Kempf, Yann; Battarbee, Markus; Ganse, Urs
- Frontiers in Physics, Vol. 6