Mitigation and prediction of disruption on the HL-2A Tokamak |
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Authors: | Zheng Yong-Zhen Qiu Ying Zhang Peng Huang Yuan Cui Zheng-Ying Sun Ping and Yang Qing-Wei |
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Institution: | Southwestern Institute of Physics, Chengdu 610041, China |
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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. |
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Keywords: | disruption current quench electro-magnetic load thermal load mitigation and prediction of disruption |
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