Bremen 2017 – scientific programme

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P: Fachverband Plasmaphysik

P 9: Magnetic Confinement I

P 9.3: Fachvortrag

Tuesday, March 14, 2017, 09:30–09:55, HS 2010

Control of Edge-Localized Mode in Magnetically Confined Fusion Plasmas — •Yunfeng Liang — Forschungszentrum Jülich GmbH, Jülich, Germany

A great challenge for fusion energy research and technology is to confine burning plasma while maintaining tolerable steady state and transient heat and particle fluxes on plasma-facing components. When tokamak plasmas operate in a high-confinement (H-mode) regime, a significant increase in the plasma energy confinement time is observed. However, as a consequence, a steep plasma pressure gradient and an associated increased current density at the plasma edge could exceed a threshold value to drive magnetohydrodynamic instabilities referred to as edge-localized modes (ELMs). ELMs lead to quasiperiodic expulsions of large amounts of energy and particles from the confined region, which in turn could result in serious damage to plasma-facing components. The next generation fusion machines, like ITER and DEMO, will need a reliable method for controlling or suppressing large ELMs.

In this paper, several newly developed ELM control methods on EAST and JET tokamaks including low n (1, 2) resonant magnetic perturbations (RMP) [Phys. Rev. Lett. 117, 115001 (2016), Phys. Rev. Lett. 105 , 065001 (2010)], Lower Hybrid Waves (LHW) [Nature Physics, 9, 817-821 (2013), Phys. Rev. Lett. 110, 235002 (2013)], Li pellets injection and Li powder [Phys. Rev. Lett. 114, 055001 (2015)] will be presented. In addition, the role of magnetic topology in accessing ELM suppression will be discussed.