Abstract Injection of high-Z impurities into plasma has been proved to be able to reduce the localized thermal load and mechanical forces on the in-vessel components and the vacuum vessel, caused by disruptions in Tokamaks. An advanced prediction and mitigation system of disruption is implemented in HL-2A to safely shut down plasmas by using the laser ablation of high-Z impurities with a perturbation real-time measuring and processing system. The injection is usually triggered by the amplitude and frequency of the MHD perturbation field which is detected with a Mirnov coil and leads to the onset of a mitigated disruption within a few milliseconds. It could be a simple and potential approach to significantly reducing the plasma thermal energy and magnetic energy before a disruption, thereby achieving safe plasma termination. The plasma response to impurity injection, a mechanism for improving plasma thermal and current quench in major disruptions, the design of the disruption prediction warner, and an evaluation of the mitigation success rate are discussed in the present paper.
Received: 26 June 2008
Revised: 06 March 2009
Accepted manuscript online:
Fund: Project supported by the National
Natural Science Foundation of China (Grant No 10475023).
Cite this article:
Zheng Yong-Zhen(郑永真), Qiu Ying(邱银), Zhang Peng(张鹏),Huang Yuan(黄渊), Cui Zheng-Ying(崔正英),Sun Ping(孙平), and Yang Qing-Wei(杨青巍) Mitigation and prediction of disruption on the HL-2A Tokamak 2009 Chin. Phys. B 18 5406
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