Nonlinear excitation of a geodesic acoustic mode by reversed shear Alfvén eignemodes
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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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2010 ◽
Keyword(s):
2014 ◽
Vol 56
(3)
◽
pp. 035001
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2018 ◽
Vol 60
(8)
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pp. 085016
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