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

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

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

Keywords

plasma instabilities
plasma waves

Access to Document

10.1017/S0022377821000672

Cite this

@article{48552401e7224a028a9768681fdb8397,

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.",

keywords = "plasma instabilities, plasma waves",

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

note = "Publisher Copyright: {\textcopyright} The Author(s), 2021.",

year = "2021",

month = aug,

doi = "10.1017/S0022377821000672",

language = "English",

volume = "87",

journal = "Journal of Plasma Physics",

issn = "0022-3778",

publisher = "Cambridge University Press",

number = "4",

}

TY - JOUR

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.

N1 - Publisher Copyright: © The Author(s), 2021.

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

UR - http://www.scopus.com/inward/record.url?scp=85125582743&partnerID=8YFLogxK

U2 - 10.1017/S0022377821000672

DO - 10.1017/S0022377821000672

M3 - Article

AN - SCOPUS:85125582743

SN - 0022-3778

VL - 87

JO - Journal of Plasma Physics

JF - Journal of Plasma Physics

IS - 4

M1 - 905870401

ER -

Electromagnetic turbulence in increased β plasmas in the Large Plasma Device

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this