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Oct 13 – 18, 2014
Hotel Park Inn Pribaltiyskaya
Europe/Moscow timezone

Progress in Active Control of Divertor Power Load in the EAST Superconducting Tokamak

Oct 15, 2014, 8:30 AM
4h
Green 8-9 (Hotel Park Inn Pribaltiyskaya)

Green 8-9

Hotel Park Inn Pribaltiyskaya

Saint Petersburg, Russian Federation
Poster Poster 3

Speaker

Dr Liang Wang (Institute of Plasma Physics, Chinese Academy of Sciences (ASIPP))

Description

Divertor power and particle exhaust is a critical issue facing the operation of next-step fusion devices such as ITER and DEMO. Active control of excessive heat and particle fluxes under high power steady-state plasma conditions has become a frontier hotspot in magnetic confinement fusion development. Significant progress has been made in controlling transient and stationary divertor heat fluxes in the Experimental Advanced Superconducting Tokamak (EAST) since the last IAEA-FEC, using many innovative techniques such as deuterium/lithium (D2/Li) pellet injection, Supersonic Molecular Beam Injection (SMBI), and integration of radiative divertor scenario with three-dimensional (3D) magnetic topology change induced by lower hybrid current drive (LHCD). We find that the injection of solid D2 pellets can directly induce divertor plasma detachment in the RF-heated plasmas, significantly reducing steady-state heat fluxes on the divertor target plates. Plasma detachment can be modulated periodically by multi-pellet injection. Furthermore, D2 pellet injection tends to trigger compound ELMs in H-modes, mitigating transient heat fluxes, compared to the standard Type I ELMs. In addition, Li granule injection has been demonstrated, for the first time in tokamaks, to be effective at triggering small ELMs with near 100% efficiency, thus providing a novel means for divertor power load control. ELM mitigation with SMBI has also been successfully achieved in EAST, significantly reducing the amplitude and increasing the frequency of ELMs. With multi-pulse SMBI, we demonstrated for the first time that the stationary divertor heat footprint can be actively modified by transferring heat from the outer strike point to the striated heat flux area in the far scrape-off layer, which is induced by LHCD. Similar results have been observed with divertor argon seeding. This provides an additional knob for the control of the stationary divertor power load, beyond or in addition to the achievement of highly radiating divertor conditions, which may be of great interest for future fusion devices such as ITER.
Paper Number EX/P3-10
Country or International Organisation China

Primary author

Dr Liang Wang (Institute of Plasma Physics, Chinese Academy of Sciences (ASIPP))

Co-authors

Dr Alberto Loarte (ITER Organization) Dr Baonian Wan (Institute of Plasma Physics, Chinese Academy of Sciences) Mr Changzheng Li (Institute of Plasma Physics, Chinese Academy of Sciences) Dr Dennis Mansfield (Princeton University Plasma Physics Laboratory) Mr GUANGNAN LUO (Institute Of Plasma Physics, Chinese Academy Of Sciences) Dr Guosheng Xu (Institute of Plasma Physics, Chinese Academy of Sciences) Prof. Houyang Guo (Institute of Plasma Physics, Chinese Academy of Sciences) Mr Huiqian Wang (Institute of Plasma Physics, Chinese Academy of Sciences) Prof. Igor Vinyar (PELIN, LLC, 27A, Gzhatskaya, Saint Petersburg 195220, Russia) Mr Jiahong Li (Institute of Plasma Physics, Chinese Academy of Sciences) Prof. Jiangang Li (Institute of Plasma Physics, Chinese Academy of Sciences) Prof. Jiansheng Hu (Institute of Plasma Physics, Chinese Academy of Sciences) Dr Kaifu Gan (Institute of Plasma Physics, Chinese Academy of Sciences) Ms Lingyan Xiang (Institute of Plasma Physics, Chinese Academy of Sciences) Prof. Liqun Hu (Institute of Plasma Physics, Chinese Academy of Sciences) Dr Shaocheng Liu (Institute of Plasma Physics, Chinese Academy of Sciences) Prof. Xianzu Gong (Insititute of Plasma Physics, Chinese Academy Sciences) Mr Yue Chen (Institute of Plasma Physics, Chinese Academy of Sciences) Prof. Yunfeng Liang (Forschungszentrum Jülich GmbH, Germany) Mr Zhen Sun (Institute of Plasma Physics, Chinese Academy of Sciences) Dr xiaolan zou (CEA)

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