Non-inductive current start-up assisted by energetic electrons in Q-shu University experiment with steady-state spherical tokamak

Masaki Ishiguro, Kazuaki Hanada, Haiqing Liu, Hideki Zushi, Kazuo Nakamura, Akihide Fujisawa, Hiroshi Idei, Yoshihiko Nagashima, Makoto Hasegawa, Saya Tashima, Yuichi Takase, Yasuaki Kishimoto, Osamu Mitarai, Shoji Kawasaki, Hisatoshi Nakashima, Aki Higashijima

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

After intensive discharge cleaning of the chamber wall, non-inductive current start-up experiments have been successfully performed in QUEST in moderate vertical fields of about 1.0-1.5 mT with positive n-index. Simultaneously, with increasing plasma current, an asymmetric toroidal flow of energetic electrons was observed and direct measurements of current driven by this asymmetric flow were taken with a newly developed Langmuir probe technique. A numerical study of the energetic electron orbits indicates that the total current is enough to play a dominant role in the formation of a closed flux surface in QUEST.

Original languageEnglish
Article number062508
JournalPhysics of Plasmas
Volume19
Issue number6
DOIs
Publication statusPublished - Jun 2012

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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