Speaker
Zhong Yong Chen
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P1.1086.pdf
Suppression of runaway generation during disruptions by magnetic
perturbation on J-TEXT tokamak
Z. Y. Chen1 , Z. F. Lin1, D. W. Huang1, R. H. Tong1, W. Yan1, Y. H. Ding1, Y.
Liang1 and J-TEXT Team
1. International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics,
State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of
Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan,
430074, China
Corresponding author: Z Y Chen E-mail: zychen@mail.hust.edu.cn
High-energy runaway electrons generated during the plasma disruption could
result serious damage to plasma-facing components. The next generation fusion
machines, like ITER and DEMO, will need a reliable method for controlling or
suppressing runaway electrons. Previous experimental results show that the
massive gas injection can’t provide enough impurities to achieve robust
runaway suppression due to low gas mixture efficiency and extreme high
Rosenbluth density for runaway avoidance.The transport of runaway electrons
is affected by the magnetic perturbation. Robust runaway suppression has been
reached on J-TEXT with mode penetration or mode locking by the application
of resonant magnetic perturbation (RMP) with m/n=2/1 before the thermal
quench. The strong stochastics in the whole plasma cross section expel out the
runaway seed and results in runaway free disruptions on J-TEXT. This provides
alternative runaway suppression during disruptions for large scale tokamak. It is
found that hydrogen supersonic molecular beam injection has the capacity to
eliminate RE current by provoking magnetic perturbations which increase RE
losses rapidly.
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