Electromagnetic turbulence in increased β plasmas in the Large Plasma Device

Rossi, G. D.; Carter, T. A.; Seo, B.; Robertson, J.; Pueschel, M. J.; Terry, P. W.

doi:10.1017/s0022377821000672

Electromagnetic turbulence in increased β plasmas in the Large Plasma Device

Journal Article · 09 July 2021 · Journal of Plasma Physics

DOI:https://doi.org/10.1017/s0022377821000672· OSTI ID:1849048

; ; ; ; ; Terry, P. W.

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.

Research Organization:: Univ. of California, Los Angeles, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: FC02-07ER54918; SC0014113

OSTI ID:: 1849048

Journal Information:: Journal of Plasma Physics, Vol. 87, Issue 4; ISSN 0022-3778

Publisher:: Cambridge University Press

Country of Publication:: United States

Language:: English

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