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Electromagnetic turbulence in increased β plasmas in the Large Plasma Device

Published online by Cambridge University Press:  09 July 2021

G.D. Rossi Open the ORCID record for G.D. Rossi [Opens in a new window] ,
T.A. Carter Open the ORCID record for T.A. Carter [Opens in a new window] ,
B. Seo Open the ORCID record for B. Seo [Opens in a new window] ,
J. Robertson Open the ORCID record for J. Robertson [Opens in a new window] ,
M.J. Pueschel Open the ORCID record for M.J. Pueschel [Opens in a new window]  and
P.W. Terry
G.D. Rossi*
Affiliation:
Department of Physics and Astronomy, University of California, Los Angeles, 405 Hilgard Ave, Los Angeles, CA90034, USA
T.A. Carter
Affiliation:
Department of Physics and Astronomy, University of California, Los Angeles, 405 Hilgard Ave, Los Angeles, CA90034, USA
B. Seo
Affiliation:
Physical Sciences Department, Embry-Riddle Aeronautical University, Daytona Beach, FL32114, USA
J. Robertson
Affiliation:
Department of Physics and Astronomy, University of California, Los Angeles, 405 Hilgard Ave, Los Angeles, CA90034, USA
M.J. Pueschel
Affiliation:
Dutch Institute for Fundamental Energy Research, Eindhoven, Netherlands
P.W. Terry
Affiliation:
Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin53706, USA
*
†Email address for correspondence: grossi@g.ucla.edu
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Abstract

The variation of pressure-gradient-driven turbulence with plasma $\beta$ (up to $\beta \approx 15\,\%$) is investigated in linear, magnetized plasma. The magnitude of magnetic fluctuations is observed to increase substantially with increasing $\beta$. More importantly, parallel magnetic fluctuations are observed to dominate at higher $\beta$ values, with $\delta B_\parallel / \delta B_\perp \approx 2$ and $\delta B / B_0 \approx 1\,\%$. Parallel magnetic fluctuations are strongly correlated with density fluctuations and the two are observed to be out of phase. The relative magnitude of and cross-phase between density and parallel magnetic field fluctuations are consistent with the dynamic pressure balance ($P+{B_{0}^2}/{2\mu _0} = \textrm {constant}$). A local slab model theory for electromagnetic, modified drift Alfvén waves, including parallel magnetic fluctuations, shows partial agreement with experimental observations.

Keywords

plasma wavesplasma instabilities
Type
Research Article
Information
Journal of Plasma Physics , Volume 87 , Issue 4 , August 2021 , 905870401
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press

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References

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