TY - JOUR
T1 - Non-inductive current drive by EC waves in an inboard poloidal magnetic field null configuration on the spherical tokamak QUEST
AU - QUEST Team
AU - Tashima, Saya
AU - Zushi, Hideki
AU - Isobe, Mitsutaka
AU - Idei, Hiroshi
AU - Okamura, Shoichi
AU - Hanada, Kazuaki
AU - Nakamura, Kazuo
AU - Fujisawa, Akihide
AU - Matsuoka, Keisuke
AU - Hasegawa, Makoto
AU - Nagashima, Yoshihiko
AU - Kawasaki, Shoji
AU - Nakashima, Hisatoshi
AU - Higashijima, Aki
N1 - Funding Information:
It is a pleasure to acknowledge the invaluable contribution of the QUEST technical and data acquisition staffs. This work is supported by a Grant-in-aid for Scientific Research (23·4190). This work is also performed with the support and under the auspices of the NIFS Collaboration Research Program (NIFS11KUTR063).
Publisher Copyright:
© 2013 The Japan Society of Plasma Science and Nuclear Fusion Research.
PY - 2013
Y1 - 2013
N2 - To investigate the effects of confinement of fast electrons on poloidal beta equilibrium, experiments under different toroidal magnetic mirror ratios, MOMFC, were performed in electron cyclotron heated plasma in the spherical tokamak QUEST. The proportional constants of the relation between plasma current and vertical magnetic fields decreased with increase in MOMFC. The poloidal field null point appeared in the chamber for MOMFC > 1.8 at a plasma current value of ~15 kA. Poloidal beta and temperature of hard X-rays increased with MOMFC. This suggests that high poloidal beta equilibrium plasma is produced by better confinement of energetic trapped particles.
AB - To investigate the effects of confinement of fast electrons on poloidal beta equilibrium, experiments under different toroidal magnetic mirror ratios, MOMFC, were performed in electron cyclotron heated plasma in the spherical tokamak QUEST. The proportional constants of the relation between plasma current and vertical magnetic fields decreased with increase in MOMFC. The poloidal field null point appeared in the chamber for MOMFC > 1.8 at a plasma current value of ~15 kA. Poloidal beta and temperature of hard X-rays increased with MOMFC. This suggests that high poloidal beta equilibrium plasma is produced by better confinement of energetic trapped particles.
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U2 - 10.1585/pfr.8.2402118
DO - 10.1585/pfr.8.2402118
M3 - Article
AN - SCOPUS:85034749969
SN - 1880-6821
VL - 8
JO - Plasma and Fusion Research
JF - Plasma and Fusion Research
M1 - 2402118
ER -