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Soft H-L back transitions by applying resonant magnetic perturbations in the low q95 EAST plasmas

L M Shao, R Chen, Y W Sun, M F Wu, W Gao, K D Li, X Li, M N Jia, Q Ma, L Y Meng2024年Plasma Physics and Controlled FusionIF 2.2出版社

Controlled 'soft' H-L transitions with a simultaneous ramp-down of plasma density and stored energy, generated by applying resonant magnetic perturbations (n = 2 RMPs), relevant to the control of ITER terminations, are achieved in the EAST tokamak. These H-mode plasmas are run at median electron densities and a low safety factor q95 (–4.0) under neutral beam injection (NBI) dominant heating. During a slow ramp in the RMP current the internal transport barrier for the electron density collapses at the beginning and the edge transport barrier for the electron density collapses later. Before the controlled H-L back transitions, the plasma stored energy WMHD is linearly correlated with the core line-averaged density . These controlled H-L back transitions ensue from the collapse of the edge transport barrier and at a similar energy confinement time ms. These H-L transitions are not sensitive to the NBI power but are very sensitive to the fueling rate and ramp-up rate of the RMP current.

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EASTMagnetic perturbationResonant magnetic perturbation
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