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Bak, Jun-Gyo; Kim, Heung-Su; Juhn, Jun-Woo; Seo, Dong-Cheol; Bang, Eun-Nam; Hong, Suk-Ho; Bae, Min-Keun; Chung, Kyu-Sun, E-mail: jgbak@nfri.re.kr
Proceeding of A3 foresight program seminar on critical physics issues specific to steady state sustainment of high-performance plasmas 20142014
Proceeding of A3 foresight program seminar on critical physics issues specific to steady state sustainment of high-performance plasmas 20142014
AbstractAbstract
[en] The characteristics of the divertor particle fluxes are investigated from the edge Langmuir probe assembly (ELPA) measurements at the lower divertor region in the lower single null (LSN) configuration during ELMy H-mode discharges in Korea Superconducting Tokamak Advanced Research (KSTAR). Firstly, it is found that the peak amplitude of the divertor particle flux near the strike point during an ELM burst, Γ_d_i_v"p"e"a"k decreases by about 20% as the ELM frequency f_E_L_M increases by a factor of ∼3 when the plasma elongation becomes higher. In addition, similar trends of the peak amplitude during an ELM phase are observed when the ELMs are mitigated by using several methods as resonant magnetic perturbation (RMP), supersonic molecular beam injection (SMBI) and electron cyclotron heating (ECH): Γ_d_i_v"p"e"a"k decreases by about 30 - 50% as f_E_L_M increases by a factor of 1.4 - 6.8. Secondly, profile of the divertor particle flux, which is mapped to the outboard mid-plane (OMP), is comparable to the upstream scrap-off layer (SOL) profile of the particle flux obtained from a fast reciprocating Langmuire probe assembly (FRLAP) measurement at the OMP. Thirdly, the characteristic e-folding length of the divertor particle flux during an ELM phase is about two times larger than ones at inter-ELM phases, and larger e-folding lengths (λ_T_e and λ_n_e) during the ELM phase are also observed from the upstream SOL profile measurements. (author)
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Morita, Shigeru (ed.) (National Institute for Fusion Science, Toki, Gifu (Japan)); Hu Liqun (ed.) (Institute of Plasma Physics, Chinese Academy of Sciences, Hefei (China)); Oh, Yeong-Kook (ed.) (National Fusion Research Institute, Daejeon (Korea, Republic of)); National Institute for Fusion Science, Toki, Gifu (Japan); 224 p; Oct 2014; p. 188-192; A3 foresight program seminar on critical physics issues specific to steady state sustainment of high-performance plasmas 2014 Japan; Kagoshima (Japan); 23-26 Jun 2014; 8 res., 8 figs.
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