Comparison of ELM-Filament Mitigation Between Supersonic Molecular Beam Injection and Pellet Injection on HL-2A*supported by National Natural Science Foundation of China (Nos. 11075046, 10975049, 11375054, 11275060), the National Magnetic Confinement Fusion Science Program of China (Nos. 2013GB112008, 2013GB107000, 2013GB104002, 2014GB107000, 2014GB108000), and the China-Korean Joint Research Program (No. 2012DFG02230). (February 2016)

• Record Type: Journal Article
• Authors: Nie 聂, Lin 林; Cheng 程, Jun 钧; Xu 徐, Hongbing 红兵; Huang 黄, Yuan 渊; Yan 严, Longwen 龙文; Ding 丁, Xuantong 玄同; Xu 许, Min 敏; Xu 许, Yuhong 宇鸿; Yao 姚, Lianghua 良骅; Feng 冯, Beibin 北滨; Zhu 朱, Genliang 根良; Liu 刘, Wandong 万东; Dong 董, Jiaqi 家齐; Yu 余, Deliang 德良; Zhong 钟, Wulv 武律; Gao 高, Jinming 金明; Chen 陈, Chengyuan 程远; Yang 杨, Qingwei 青巍; Duan 段, Xuru 旭如
• Is Part Of: Plasma science and technology. Volume 18:Number 2(2016:Feb.)
• Page Start: 120
• Page End: 125
• Publication Date: 2016-02
• Subjects: 52.25.Fi; ELM-filament -- SMBI -- pellet injection -- convective transport -- electron-ion collisionality -- long-range correlation; Plasma (Ionized gases) -- Periodicals; 530.44
• DOI: 10.1088/1009-0630/18/2/04
• Languages: English
• ISSNs: 1009-0630

Abstract

Abstract: On HL-2A, two different injections (supersonic molecular beam injection (SMBI) and pellet injection (PI)) are used to mitigate edge localized mode (ELM)-filament convective transport. The changes of their characteristics are studied in this paper. A high spatiotemporal resolution probe shows there are many similar phenomena, and the filament density amplitude and radial velocity are both suppressed. Our statistical results indicate that: the velocity suppression comes from the decrease of filament density and temperature; the transient particle and heat fluxes drop strongly; and long-range correlation along a magnetic flux surface also decreases, when the electron-ion collisionality increases significantly, which may have a role on the filament parallel current during ELM mitigation.