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Bispectral analysis of broadband turbulence and geodesic acoustic modes in the T-10 tokamak

Part of: Focus on Fusion Advancing Plasma Physics Frontiers Through Collaboration with Fusion Science

Published online by Cambridge University Press:  11 June 2021

Greg A. Riggs Open the ORCID record for Greg A. Riggs [Opens in a new window] ,
S.H. Nogami Open the ORCID record for S.H. Nogami [Opens in a new window] ,
M.E. Koepke Open the ORCID record for M.E. Koepke [Opens in a new window] ,
A.V. Melnikov Open the ORCID record for A.V. Melnikov [Opens in a new window] ,
L.G. Eliseev Open the ORCID record for L.G. Eliseev [Opens in a new window] ,
S.E. Lysenko Open the ORCID record for S.E. Lysenko [Opens in a new window] ,
P.O. Khabanov Open the ORCID record for P.O. Khabanov [Opens in a new window] ,
M.A. Drabinskij ,
N.K. Kharchev Open the ORCID record for N.K. Kharchev [Opens in a new window]  and
A.S. Kozachek
...Show all authors
Greg A. Riggs
Affiliation:
Department of Physics and Astronomy, West Virginia University, Morgantown, WV 26505, USA
S.H. Nogami
Affiliation:
Department of Physics and Astronomy, West Virginia University, Morgantown, WV 26505, USA
M.E. Koepke*
Affiliation:
Department of Physics and Astronomy, West Virginia University, Morgantown, WV 26505, USA
A.V. Melnikov
Affiliation:
National Research Centre ‘Kurchatov Institute', Moscow 123182, Russian Federation National Research Nuclear University MEPhI, Moscow 115409, Russian Federation Moscow Institute of Physics and Technology, Dolgoprudny 141700, Russian Federation
L.G. Eliseev
Affiliation:
National Research Centre ‘Kurchatov Institute', Moscow 123182, Russian Federation
S.E. Lysenko
Affiliation:
National Research Centre ‘Kurchatov Institute', Moscow 123182, Russian Federation
P.O. Khabanov
Affiliation:
National Research Centre ‘Kurchatov Institute', Moscow 123182, Russian Federation Moscow Institute of Physics and Technology, Dolgoprudny 141700, Russian Federation
M.A. Drabinskij
Affiliation:
National Research Centre ‘Kurchatov Institute', Moscow 123182, Russian Federation Moscow Institute of Physics and Technology, Dolgoprudny 141700, Russian Federation
N.K. Kharchev
Affiliation:
National Research Centre ‘Kurchatov Institute', Moscow 123182, Russian Federation Prokhorov General Physics Institute, RAS, Moscow 117942, Russian Federation
A.S. Kozachek
Affiliation:
Institute of Plasma Physics, NSC KIPT, Kharkov 310108, Ukraine
M.V. Ufimtsev
Affiliation:
Department of Computational Mathematics and Cybernetics, Moscow State University, Moscow 119991, Russian Federation
HIBP Team
Affiliation:
Institute of Plasma Physics, NSC KIPT, Kharkov 310108, Ukraine
*
†Email address for correspondence: Mark.Koepke@mail.wvu.edu
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Abstract

Local fluctuations of electrostatic potential, poloidal electric field, magnetic potential and electron density are simultaneously measured in the T-10 tokamak by a heavy ion beam probe (HIBP) having a five-slit energy analyser, which allows an estimate of the turbulent particle flux and $\boldsymbol {E}\times \boldsymbol {B}$ rotation velocity in the off-minor-axis gradient zone of the toroidal plasma column. The high spatial and temporal resolution of the modern multichannel HIBP makes it an effective tool to study plasma oscillations. Motivated by previous work that has documented time-resolved interactions between measured plasma parameters using correlation analysis (coherence of $E_{\textrm {pol}}$ and density $n_e$, and cross-phase), a new result from bicorrelation analysis (bicoherence of magnetic potential $A_\zeta$ and density $n_e$, and biphase) is reported for documenting the evidence of wave–wave coupling and energy transfer associated with the interaction between geodesic acoustic modes (GAM) and broadband, quasi-coherent modes.

Keywords

plasma nonlinear phenomena
Type
Research Article
Information
Journal of Plasma Physics , Volume 87 , Issue 3 , June 2021 , 885870301
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press

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References

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