Please wait a minute...
Chin. Phys. B, 2009, Vol. 18(12): 5406-5413    DOI: 10.1088/1674-1056/18/12/047
PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES Prev   Next  

Mitigation and prediction of disruption on the HL-2A Tokamak

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)
Southwestern Institute of Physics, Chengdu 610041, China
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.
Keywords:  disruption      current quench      electro-magnetic load      thermal load      mitigation and prediction of disruption  
Received:  26 June 2008      Revised:  06 March 2009      Accepted manuscript online: 
PACS:  52.55.Fa (Tokamaks, spherical tokamaks)  
  28.52.Fa (Materials)  
  52.25.Vy (Impurities in plasmas)  
  52.30.Cv (Magnetohydrodynamics (including electron magnetohydrodynamics))  
  52.38.Mf (Laser ablation)  
  52.55.Rk (Power exhaust; divertors)  
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

[1] Identification of m=2 competent mode of complex magneto-hydro-dynamics activities during internal soft disruption based on singular value decomposition and tomography of soft-X-ray emission on the HT-7 tokamak
Xu Li-Qing(徐立清), Hu Li-Qun(胡立群), Li Er-Zhong(李二众), Chen Kai-Yun(陈开云), Liu Zhi-Yuan(刘志远), Chen Ye-Bin(陈晔斌), Zhang Ji-Zong (张继宗), Zhou Rui-Jie(周瑞杰), Yang Mao(杨茂), Mao Song-Tao(毛松涛), and Duan Yan-Min(段艳敏) . Chin. Phys. B, 2012, 21(5): 055208.
[2] The thermal effect in diode-end-pumped continuous-wave 914-nm Nd:YVO4 laser
Yan Ren-Peng(闫仁鹏), Yu Xin(于欣), Chen De-Ying(陈德应), Chen Fei(陈飞), Li Xu-Dong(李旭东), Ma Yu-Fei(马欲飞), and Yu Jun-Hua(于俊华) . Chin. Phys. B, 2012, 21(2): 024208.
[3] HL-2A tokamak disruption forecasting based on an artificial neural network
Wang Hao(王灏), Wang Ai-Ke(王爱科), Yang Qing-Wei(杨青巍), Ding Xuan-Tong(丁玄同), Dong Jia-Qi(董家齐), Sanuki H, and Itoh K. Chin. Phys. B, 2007, 16(12): 3738-3741.
[4] Disruption mitigation using laser ablation of high-Z impurities in HL-1M tokamak
Zheng Yong-Zhen(郑永真), Feng Xing-Ya(冯兴亚), Guo Gan-Cheng(郭干城), Xu De-Ming(徐德明), and Zheng Yin-Jia(郑银甲). Chin. Phys. B, 2006, 15(9): 2053-2057.
No Suggested Reading articles found!