Investigation of Non-inductive Plasma Current Start-up by RF on QUEST

15th International Congress on Plasma Physics; 13th Latin American Workshop on Plasma Physics

Ishiguro, Masaki^1 ; Hanada, Kazuaki^2 ; Liu, Hiqing^1 ; Ogata, Ryota^1 ; Isobe, Mitsutaka^3 ; Tashima, Saya^1 ; Zushi, Hideki^2 ; Sato, Khonosuke^2 ; Fujisawa, Akihide^2 ; Nakamura, Kazuo^2 ; Idei, Hiroshi^2 ; Sakamoto, Mizuki^2 ; Hasegawa, Makoto^2 ; Takase, Yuichi^4 ; Maekawa, Takashi^5 ; Kishimoto, Yasuaki^5 ; Mitarai, Osamu^6 ; Kawasaki, Shoji^2 ; Nakashima, Hisatoshi^2 ; Higashijima, Aki^2

IGSES Kyushu University, Kasuga 816-8580, Japan^1

RIAM Kyushu University, Kasuga 816-8580, Japan^2

NIFS, Toki 509-5292, Japan^3

Graduate School of Frontier Science, University of Tokyo, Kashiwa 277-8561, Japan^4

Graduate School of Energy Science, Kyoto University, Kyoto 606-8502, Japan^5

Liberal Arts Education Center, Tokai University, Kumamoto 862-8652, Japan^6

关键词: Electron cyclotron resonance heating;    Flux surfaces;    Inductive plasma;    Magnetic configuration;    Non-inductive currents;    Particle recycling;    Plasma production;    Wall conditioning;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/511/1/012041/pdf
DOI  :  10.1088/1742-6596/511/1/012041

来源: IOP

【 摘 要 】

Formations of a closed flux surface (CFS) on QUEST are achieved by fully non-inductive current start-up driven by RF, which is 8.2GHz in frequency and more than 40kW in power. It found that appropriate magnetic configuration with positive n-index and reduction of particle recycling was crucial to achieve the non-inductive plasma current start-up (PCS) successfully. Especially the controllability of particle recycling should be improved by wall conditioning based on successive plasma production and wall cleaning with electron cyclotron resonance heating (ECR) plasmas induced by RF in frequency of 2.45GHz.