Electromagnetic turbulence in increased β plasmas in the Large Plasma Device

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

doi:10.1017/S0022377821000672

Electromagnetic turbulence in increased β plasmas in the Large Plasma Device

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

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Abstract

The variation of pressure-gradient-driven turbulence with plasma β (up to β ≈ 15%) is investigated in linear, magnetized plasma. The magnitude of magnetic fluctuations is observed to increase substantially with increasing β. More importantly, parallel magnetic fluctuations are observed to dominate at higher β values, with δB_‖/δB_⊥ ≈ 2 and δB/B₀ ≈ 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 + B²₀ /2µ₀ = constant). A local slab model theory for electromagnetic, modified drift Alfvén waves, including parallel magnetic fluctuations, shows partial agreement with experimental observations.

Original language	English
Article number	905870401
Journal	Journal of Plasma Physics
Volume	87
Issue number	4
DOIs	https://doi.org/10.1017/S0022377821000672
State	Published - Aug 2021
Externally published	Yes

Funding

This work was performed using the Basic Plasma is supported by US DOE and NSF. Support for this awards DE-FC02-07ER54918:0023, DE-SC0014113:0003; PHY-1561912:004. The authors thank Z. Lucky, M. Drandell and P. Pribyl for technical support in executing the experiments. This work was performed using the Basic Plasma Science Facility, which is supported by US DOE and NSF. Support for this work came from DOE awards DE-FC02-07ER54918:0023, DE-SC0014113:0003; and from NSF award PHY-1561912:004.

Keywords

plasma instabilities
plasma waves

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10.1017/S0022377821000672

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title = "Electromagnetic turbulence in increased β plasmas in the Large Plasma Device",

abstract = "The variation of pressure-gradient-driven turbulence with plasma β (up to β ≈ 15\%) is investigated in linear, magnetized plasma. The magnitude of magnetic fluctuations is observed to increase substantially with increasing β. More importantly, parallel magnetic fluctuations are observed to dominate at higher β values, with δB‖/δB⊥ ≈ 2 and δB/B0 ≈ 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 + B20 /2µ0 = constant). A local slab model theory for electromagnetic, modified drift Alfv{\'e}n waves, including parallel magnetic fluctuations, shows partial agreement with experimental observations.",

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author = "Rossi, \{G. D.\} and Carter, \{T. A.\} and B. Seo and J. Robertson and Pueschel, \{M. J.\} and Terry, \{P. W.\}",

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T1 - Electromagnetic turbulence in increased β plasmas in the Large Plasma Device

AU - Rossi, G. D.

AU - Carter, T. A.

AU - Seo, B.

AU - Robertson, J.

AU - Pueschel, M. J.

AU - Terry, P. W.

PY - 2021/8

Y1 - 2021/8

N2 - The variation of pressure-gradient-driven turbulence with plasma β (up to β ≈ 15%) is investigated in linear, magnetized plasma. The magnitude of magnetic fluctuations is observed to increase substantially with increasing β. More importantly, parallel magnetic fluctuations are observed to dominate at higher β values, with δB‖/δB⊥ ≈ 2 and δB/B0 ≈ 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 + B20 /2µ0 = constant). A local slab model theory for electromagnetic, modified drift Alfvén waves, including parallel magnetic fluctuations, shows partial agreement with experimental observations.

AB - The variation of pressure-gradient-driven turbulence with plasma β (up to β ≈ 15%) is investigated in linear, magnetized plasma. The magnitude of magnetic fluctuations is observed to increase substantially with increasing β. More importantly, parallel magnetic fluctuations are observed to dominate at higher β values, with δB‖/δB⊥ ≈ 2 and δB/B0 ≈ 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 + B20 /2µ0 = constant). A local slab model theory for electromagnetic, modified drift Alfvén waves, including parallel magnetic fluctuations, shows partial agreement with experimental observations.

KW - plasma instabilities

KW - plasma waves

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DO - 10.1017/S0022377821000672

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JO - Journal of Plasma Physics

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ER -

Electromagnetic turbulence in increased β plasmas in the Large Plasma Device

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