Open AccessThermal ions heat transport induced by reversed shear Alfvén eigenmode on the HL-2A tokamak
Author(s) -
P.W. Shi,
Zhiyong Qiu,
W. Chen,
Z.X. Wang,
Z.B. Shi,
Liming Yu,
Z.C. Yang,
W.L. Zhong,
M. Jiang,
Xiao Ji,
Yang Qi,
M. Xu,
X.R. Duan
Publication year - 2020
Publication title -
nuclear fusion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.774
H-Index - 120
eISSN - 1741-4326
pISSN - 0029-5515
DOI - 10.1088/1741-4326/ab8546
Subject(s) - tokamak , sawtooth wave , ion , plasma , atomic physics , heat flux , thermal , physics , amplitude , excited state , materials science , heat transfer , mechanics , thermodynamics , nuclear physics , optics , quantum mechanics , computer science , computer vision
Experimental investigations of thermal ions heat transport induced by reversed shear Alfvén eigenmodes (RSAEs) have been carried out on the HL-2A tokamak. It is found that the RSAEs are driven unstable by passing particles during the second half of sawtooth periods, and can not only degrade the bremsstrahlung radiations, but also cause obvious reduction of the ion temperature in the core plasma. Interestingly, the RSAEs excited by energetic ions can resonant with the thermal ions, and then lead to a heat transport process. Statistical results suggest there is a quadratic dependence between thermal ion heat flux perturbation and mode amplitude, which indicates a diffusive mechanism of plasma transport and is well explained by the theoretical interpretations derived from quasi-linear transport theory.