Characteristics of geodesic acoustic mode zonal flow and ambient turbulence at the edge of the HL-2A tokamak plasmas

2007 ◽  
Vol 14 (12) ◽  
pp. 122301 ◽  
Author(s):  
K. J. Zhao ◽  
J. Q. Dong ◽  
L. W. Yan ◽  
W. Y. Hong ◽  
T. Lan ◽  
...  
Keyword(s):  
Zonal Flow ◽  
Acoustic Mode ◽  
Tokamak Plasmas ◽  
Geodesic Acoustic Mode ◽  
Ambient Turbulence

Zonal flows in the geodesic acoustic mode frequency range in the JIPP T-IIU tokamak plasmas

2005 ◽  
Vol 45 (2) ◽  
pp. 81-88 ◽  
Author(s):  
Y Hamada ◽  
A Nishizawa ◽  
T Ido ◽  
T Watari ◽  
M Kojima ◽  
...  
Keyword(s):  
Acoustic Mode ◽  
Mode Frequency ◽  
Tokamak Plasmas ◽  
Frequency Range ◽  
Zonal Flows ◽  
Geodesic Acoustic Mode

Toroidal Symmetry of the Geodesic Acoustic Mode Zonal Flow in a Tokamak Plasma

2006 ◽  
Vol 96 (25) ◽  
Author(s):  
K. J. Zhao ◽  
T. Lan ◽  
J. Q. Dong ◽  
L. W. Yan ◽  
W. Y. Hong ◽  
...  
Keyword(s):  
Zonal Flow ◽  
Acoustic Mode ◽  
Tokamak Plasma ◽  
Geodesic Acoustic Mode

Excitation of zonal flow by nonlinear geodesic acoustic mode

2020 ◽  
Vol 27 (3) ◽  
pp. 034501
Author(s):  
Haijun Ren ◽  
X. Q. Xu
Keyword(s):  
Zonal Flow ◽  
Acoustic Mode ◽  
Geodesic Acoustic Mode

Geodesic–acoustic-mode in JFT-2M tokamak plasmas

2006 ◽  
Vol 48 (4) ◽  
pp. S41-S50 ◽  
Author(s):  
T Ido ◽  
Y Miura ◽  
K Kamiya ◽  
Y Hamada ◽  
K Hoshino ◽  
...  
Keyword(s):  
Acoustic Mode ◽  
Tokamak Plasmas ◽  
Geodesic Acoustic Mode

Electromagnetic effects of kinetic geodesic acoustic mode in tokamak plasmas

2011 ◽  
Vol 18 (5) ◽  
pp. 052506 ◽  
Author(s):  
Lingfeng Wang ◽  
J. Q. Dong ◽  
Y. Shen ◽  
H. D. He
Keyword(s):  
Acoustic Mode ◽  
Tokamak Plasmas ◽  
Electromagnetic Effects ◽  
Geodesic Acoustic Mode

Energetic-particle-induced electromagnetic geodesic acoustic mode in tokamak plasmas

2014 ◽  
Vol 21 (7) ◽  
pp. 072511 ◽  
Author(s):  
Lingfeng Wang ◽  
J. Q. Dong ◽  
Zhixiong He ◽  
Hongda He ◽  
Y. Shen
Keyword(s):  
Energetic Particle ◽  
Acoustic Mode ◽  
Tokamak Plasmas ◽  
Geodesic Acoustic Mode

scholarly journals Trapped particle precession and sub-bounce zonal flow dynamics in tokamaks

2018 ◽  
Vol 84 (1) ◽  
Author(s):  
W. Sengupta ◽  
A. B. Hassam
Keyword(s):  
Angular Momentum ◽  
Electric Field ◽  
Radial Electric Field ◽  
Zonal Flow ◽  
Acoustic Mode ◽  
Apparent Paradox ◽  
Zonal Flows ◽  
Long Wavelength ◽  
Particle Flows ◽  
Geodesic Acoustic Mode

A drift-kinetic calculation in an axisymmetric tokamak, with super-diamagnetic flows, is presented to elucidate the relation between the radial electric field, $E_{r}$, zonal flows and the rapid precession of the trapped particle (TP) population. It has been shown earlier (Rosenbluth & Hinton, Phys. Rev. Lett., vol. 80(4), 1998, p. 724, hereafter RH) that an initial radial electric field results in geodesic acoustic mode oscillations which subsequently Landau damp, resulting in a much smaller final residual electric field, and accompanying parallel zonal flows. We observe an apparent paradox: the final angular momentum in the RH parallel zonal flow is much smaller than the angular momentum expected from the well-known rapid precession of the trapped particle population in the RH residual electric field. We reconcile this paradox by illuminating the presence of a population of reverse circulating particle flows that, dominantly, are equal and opposite to the rapid TP precession. Mathematically, the calculation is facilitated by transforming to an energy coordinate shifted from conventional by an amount proportional to $E_{r}$. We also discuss the well-known RH coefficient in the context of effective mass and show how the TP precession and the opposite circulating flows contribute to this mass. Finally, we show that in the long wavelength limit, the RH flows and RH coefficient arise as a natural consequence of conservation of toroidal angular momentum and the second adiabatic invariant.

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