| 1 | Observation and Simulation of n=1 Reversed Shear Alfvén Eigenmode on the HL-2A Tokamak显示文摘A branch of high-frequency Alfvenic modes is observed on the HL-2A tokamak.The electromagnetic mode can be driven unstably in the plasma with an off-axis neutral beam heating.Its mode frequency keeps almost unchanged or presents a slow-sweeping behavior,depending on the detail current evolution.The poloidal and toroidal mode numbers are��m/n=1/1.The mode has a quite short duration(≤20 ms)and usually appears 5-10 ms after the neutral beam being injected into the plasma.Hybrid simulations based on M3D-K have also been carried out.The result suggests that co-passing energetic particles are responsible for the mode excitation.The simulated mode structures are localized nearby location of minimum safety factor(q_(min))and agree with the structures obtained through tomography of soft x-ray arrays.Further,the modes are localized in the continuum gap and their frequencies increase with variation of��min in a wide range.Last but not least,the characteristic of unchanged frequency on experiment is also reproduced by the nonlinear simulation with a fixed safety factor.All those evidences indicate that the��n=1 high-frequency mode may belong to a reversed shear Alfven eigenmode. | P.W.Shi Y.R.Yang W.Chen Z.B.Shi Z.C.Yang L.M.Yu T.B.Wang X.X.He X.Q.Ji W.L.Zhong M.Xu X.R.Duan | 2022 | Chinese Physics Letters2022，39，10： | 0 |
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