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

Riggs, Greg A.; Nogami, S. H.; Koepke, M. E.; Melnikov, A. V.; Eliseev, L. G.; Lysenko, S. E.; Khabanov, P. O.; Drabinskij, M. A.; Kharchev, N. K.; Kozachek, A. S.; Ufimtsev, M. V.

doi:10.1017/s0022377821000490

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

Journal Article · Tue Jun 01 00:00:00 EDT 2021 · Journal of Plasma Physics

DOI:https://doi.org/10.1017/s0022377821000490· OSTI ID:1852472

^[1]; ; ; ; ; ; ; Drabinskij, M. A.; ; Kozachek, A. S.; Ufimtsev, M. V.

OSTI

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.

Research Organization:: West Virginia Univ., Morgantown, WV (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Contributing Organization:: HIBP Team

DOE Contract Number:: SC0018036; SC0020269

OSTI ID:: 1852472

Journal Information:: Journal of Plasma Physics, Journal Name: Journal of Plasma Physics Journal Issue: 3 Vol. 87; ISSN 0022-3778

Publisher:: Cambridge University Press

Country of Publication:: United States

Language:: English

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