Comparison of different noble gas injections by massive gas injection on plasma disruption mitigation on Experimental Advanced Superconducting Tokamak
Sheng-Bo Zhao(赵胜波)1,2, Hui-Dong Zhuang(庄会东)1,†, Jing-Sheng Yuan(元京升)1,2, De-Hao Zhang(张德皓)1,2, Li Li(黎立)1,2, Long Zeng(曾龙)3, Da-Long Chen(陈大龙)1, Song-Tao Mao(毛松涛)1, Ming Huang(黄明)1, Gui-Zhong Zuo(左桂忠)1,‡, and Jian-Sheng Hu(胡建生)1
1 Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China; 2 University of Science and Technology of China, Hefei 230026, China; 3 Department of Engineering Physics, Tsinghua University, Beijing 100084, China
Abstract Massive gas injection (MGI) is a traditional plasma disruption mitigation method. This method directly injected massive gas into the pre-disruption plasma and had been developed on the Experimental Advanced Superconducting Tokamak (EAST). Different noble gas injection experiments, including He, Ne, and Ar, were performed to compare the mitigation effect of plasma disruption by evaluating the key parameters such as flight time, pre-thermal quench (pre-TQ), and current quench (CQ). The flight time was shorter for low atomic number (Z) gas, and the decrease in flight time by increasing the amount of gas was insignificant. However, both pre-TQ and CQ durations decreased considerably with the increase in gas injection amount. The effect of atomic mass on pre-TQ and CQ durations showed the opposite trend. The observed trend could help in controlling CQ duration in a reasonable area. Moreover, the analysis of radiation distribution with different impurity injections indicated that low Z impurity could reduce the asymmetry of radiation, which is valuable in mitigating plasma disruption. These results provided essential data support for plasma disruption mitigation on EAST and future fusion devices.
Fund: Project supported by the National Key Research and Development Program of China (Grant Nos. 2017YFE0301100 and 2022YFE03130000), the National Natural Science Foundation of China (Grant Nos. 12105322, 11905138, 11905148, and 11905254), the Natural Science Foundation of Anhui Province of China (Grant No. 2108085QA38), the Chinese Postdoctoral Science Found (Grant No. 2021000278), the Presidential Foundation of Hefei Institutes of Physical Science (Grant No. YZJJ2021QN12), the U.S. Department of Energy contract DE-AC02-09CH11466 (Grant No. DE-SC0016553), the Users with Excellence Program of Hefei Science Center CAS (Grant Nos. 2020HSC-UE010 and 2021HSC-UE013), and Interdisciplinary and Collaborative Teams of CAS.
Sheng-Bo Zhao(赵胜波), Hui-Dong Zhuang(庄会东), Jing-Sheng Yuan(元京升), De-Hao Zhang(张德皓),Li Li(黎立), Long Zeng(曾龙), Da-Long Chen(陈大龙), Song-Tao Mao(毛松涛), Ming Huang(黄明),Gui-Zhong Zuo(左桂忠), and Jian-Sheng Hu(胡建生) Comparison of different noble gas injections by massive gas injection on plasma disruption mitigation on Experimental Advanced Superconducting Tokamak 2023 Chin. Phys. B 32 075207
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