Role of energetic electrons during current ramp-up and production of high poloidal beta plasma in non-inductive current drive on QUEST

Saya Tashima, H. Zushi, M. Isobe, K. Hanada, H. Idei, K. Nakamura, A. Fujisawa, K. Matsuoka, M. Hasegawa, Y. Nagashima, S. Okamura, S. Banerjee, S. Kawasaki, H. Nakashima, A. Higashijima

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

A scenario for non-inductive current ramp-up has been demonstrated using electron cyclotron waves in the spherical tokamak QUEST. The configuration was characterized by a high toroidal magnetic mirror ratio of 2 and a steady vertical magnetic field of more than 10% of the toroidal magnetic field. The generation and confinement of energetic electrons having energy greater than 10 keV were studied using hard x-rays. Because of the energetic electron pressure, a natural divertor formed with an inboard poloidal field null at the high poloidal beta (approximately 3-4).

Original languageEnglish
Article number023010
JournalNuclear Fusion
Volume54
Issue number2
DOIs
Publication statusPublished - Feb 1 2014

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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