scholarly journals Short wavelength geodesic acoustic mode excitation by energetic particles

2018 ◽  
Vol 25 (1) ◽  
pp. 014505 ◽  
Author(s):  
Liu Chen ◽  
Zhiyong Qiu ◽  
Fulvio Zonca
Keyword(s):  
Short Wavelength ◽  
Energetic Particles ◽  
Acoustic Mode ◽  
Mode Excitation ◽  
Geodesic Acoustic Mode

Effects of passing energetic particles on geodesic acoustic mode

2014 ◽  
Vol 21 (10) ◽  
pp. 102506 ◽  
Author(s):  
Haijun Ren ◽  
Chao Dong
Keyword(s):  
Energetic Particles ◽  
Acoustic Mode ◽  
Geodesic Acoustic Mode

scholarly journals On nonlinear self-interaction of geodesic acoustic mode driven by energetic particles

2010 ◽  
Vol 77 (4) ◽  
pp. 457-467 ◽  
Author(s):  
G. Y. FU
Keyword(s):  
Electric Field ◽  
Plasma Density ◽  
Second Harmonic ◽  
Fluid Model ◽  
Density Perturbation ◽  
Radial Electric Field ◽  
Energetic Particles ◽  
Acoustic Mode ◽  
Second Order ◽  
Geodesic Acoustic Mode

AbstractIt is shown that nonlinear self-interaction of energetic particle-driven geodesic acoustic mode does not generate a second harmonic in radial electric field using the fluid model. However, kinetic effects of energetic particles can induce a second harmonic in the radial electric field. A formula for the second-order plasma density perturbation is derived. It is shown that a second harmonic of plasma density perturbation is generated by the convective nonlinearity of both thermal plasma and energetic particles. Near the midplane of a tokamak, the second-order plasma density perturbation (the sum of second harmonic and zero frequency sideband) is negative on the low field side with its size comparable to the main harmonic at low fluctuation level. These analytic predictions are consistent with the recent experimental observation in DIII-D.

scholarly journals Observation of subcritical geodesic acoustic mode excitation in the large helical device

2017 ◽  
Vol 57 (7) ◽  
pp. 072009 ◽  
Author(s):  
T. Ido ◽  
K. Itoh ◽  
M. Lesur ◽  
M. Osakabe ◽  
A. Shimizu ◽  
...  
Keyword(s):  
Acoustic Mode ◽  
Mode Excitation ◽  
Geodesic Acoustic Mode

Geodesic Acoustic Mode in Toroidal Plasma

2010 ◽  
Author(s):  
N. Chakrabarti ◽  
P. N. Guzdar ◽  
R. G. Kleva ◽  
R. Singh ◽  
P. K. Kaw ◽  
...  
Keyword(s):  
Acoustic Mode ◽  
Toroidal Plasma ◽  
Geodesic Acoustic Mode

Nonlinear excitation of a geodesic acoustic mode by reversed shear Alfvén eignemodes

2021 ◽  
Author(s):  
Yahui Wang ◽  
Tao Wang ◽  
Shizhao Wei ◽  
Zhiyong Qiu
Keyword(s):  
Steady State ◽  
Plasma Heating ◽  
Acoustic Mode ◽  
Decay Process ◽  
Nonlinear Excitation ◽  
Parametric Decay ◽  
Geodesic Acoustic Mode ◽  
Burning Plasmas ◽  
Reversed Shear ◽  
Excitation Conditions

Abstract The parametric decay process of a reversed shear Alfv\'{e}n eigenmeode (RSAE) into a geodesic acoustic mode (GAM) and a kinetic reversed shear Alfv\'{e}n eigenmode (KRSAE) is investigated using nonlinear gyrokinetic theory. The excitation conditions mainly require the pump RSAE amplitude to exceed a certain threshold, which could be readily satisfied in burning plasmas operated in steady-state advanced scenario. This decay process can contribute to thermal plasma heating and confinement improvement.

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