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4-7 November 2019
IAEA Headquarters, Vienna, Austria
Europe/Vienna timezone
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Latest advances in active control of H-mode detachment and its physics on EAST for ITER/CFETR

4 Nov 2019, 12:50
20m
Board Room C (C Building, 4th Floor) (IAEA Headquarters, Vienna, Austria)

Board Room C (C Building, 4th Floor)

IAEA Headquarters, Vienna, Austria

Oral (Plenary Session) Radiative Power Exhaust Divertor Plasma Control

Speaker

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

Description

Active handling of excessively high heat load and tungsten sputtering on divertor targets is of critical challenge for EAST and future fusion devices like ITER and CFETR. It is acknowledged by the fusion community that divertor detachment is the most promising means for steady state plasma-wall interaction control.

Significant progresses on the active feedback control of H-mode detachment for long-pulse high-performance operations have been made in EAST with ITER-like tungsten divertor in the last two years. A serial of methods and systematic experiments for detachment control including radiation power, particle flux roll-over, Te < 5 eV have been successfully developed, respectively. Both neon and argon impurity seeding have been demonstrated in maintaining the divertor detachment stably. More importantly, it has been observed that the core plasma performance exhibits no significant loss or even a slight increase during the stable feedback control phase, suggesting excellent divertor-edge-core plasma integration. A new periodic detached-attached dithering regime, which is of potential application for steady state operations, was clearly identified and reproduced with different target-Te values. A new detachment feedback control scheme, which combines divertor Te and radiation signals into feedback to achieve sustained detachment, has also been demonstrated successfully. It is indicated that the ExB drifts and other SOL flows play key important roles to the success of the detachment access and long pulse maintenance. The detachment density threshold exhibits a strong dependence on the divertor closure. The radiation feedback control for detachment was demonstrated in DIII-D high beta_p H-mode scenario within the joint DIII-D/EAST Task Force. Further experiments to demonstrate the latest EAST results of drift effect on detachment is scheduled in September on DIII-D in the high beta_p scenario with different divertor geometry. New advances that may arise will also be presented. These latest detachment advances and related physics understanding are of great importance to the design of CFETR divertor and the steady state operation of ITER.

This work was supported by the National Key Research and Development Program of China (No. 2017YFE0301300), the US Department of Energy (No. DE-FC02-04ER546981), the Anhui Natural Science Foundation (No. 1808085J07).

[1] K. Wu, Q. P. Quan, B. J. Xiao, L. Wang et al., Nucl. Fusion 58, 056019 (2018)
[2] L. Wang et al., Nucl. Fusion 59, 086036 (2019)
[3] J. B. Liu, L. Wang
et al., submitted to Nucl. Fusion (in revision)

Affiliation Institute of Plasma Physics, Chinese Academy of Sciences
Country or International Organization China, People’s Republic

Primary author

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

Co-authors

Qiping Yuan Mr Kedong Li (Institute of Plasma Physics, Chinese Academy of Sciences) Mr Kai Wu (Institute of Plasma Physics, Chinese Academy of Sciences) Dr Jichan Xu (Institute of Plasma Physics, Chinese Academy of Sciences) Dr Jianbin Liu (Institute of Plasma Physics, Chinese Academy of Sciences) Mr Lingyi Meng (Institute of Plasma Physics, Chinese Academy of Sciences) Dr Yanmin Duan (Institute of Plasma Physics, Chinese Academy of Sciences) Dr Bin Zhang (Institute of Plasma Physics, Chinese Academy of Sciences) Dr Bin Cao (Institute of Plasma Physics, Chinese Academy of Sciences) Dr Zhongshi Yang (Institute of Plasma Physics, Chinese Academy of Sciences) Dr Fang Ding (Institute of Plasma Physics, Chinese Academy of Sciences) Guosheng Xu (Institute of Plasma Physics, Chinese Academy of Sciences) Bingjia Xiao (Institute of Plasma Physics, Chinese Academy of Sciences) GUANG-NAN LUO (Institute Of Plasma Physics, Chinese Academy Of Sciences) Xianzu Gong (Insititute of Plasma Physics, Chinese Academy Sciences) David Eldond (Princeton University) Dr Huiqian Wang (General Atomics, San Diego, CA 92186 USA) Houyang Guo (General Atomics) Jayson Barr (General Atomics) Anthony W. Leonard (General Atomics) Mr Al Hyatt (Genaral Atomics, USA) Mr Dan Thomas (General Atomics, USA) David Humphreys (General Atomics) A. M. Garofalo (General Atomics) Jiangang Li (Institute of Plasma Physics, Chinese Academy of Sciences) Baonian Wan (Institute of Plasma Physics, Chinese Academy of Sciences)

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