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Xu, G S; Yang, Q Q; Yan, N; Wang, Y F; Xu, X Q; Guo, H Y; Maingi, R; Wang, L; Qian, J P; Gong, X Z; Chan, V S; Zhang, T; Zang, Q; Li, Y Y; Zhang, L; Hu, G H; Wan, B N
Physical review letters, 06/2019, Volume: 122, Issue: 25Journal Article
A reproducible stationary high-confinement regime with small "edge-localized modes" (ELMs) has been achieved recently in the Experimental Advanced Superconducting Tokamak, which has a metal wall and low plasma rotation as projected for a fusion reactor. We have uncovered that this small ELM regime is enabled by a wide edge transport barrier (pedestal) with a low density gradient and a high density ratio between the pedestal foot and top. Nonlinear simulations reveal, for the first time, that the underlying mechanism for the observed small ELM crashes is the upper movement of the peeling boundary induced by an initial radially localized collapse in the pedestal, which stops the growth of instabilities and further collapse of the pedestal, thus providing a physics basis for mitigating ELMs in future steady-state fusion reactors.
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