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

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. Th...

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Published inNuclear fusion Vol. 54; no. 2; pp. 23010 - 11
Main Authors Tashima, Saya, Zushi, H., Isobe, M., Hanada, K., Idei, H., Nakamura, K., Fujisawa, A., Matsuoka, K., Hasegawa, M., Nagashima, Y., Okamura, S., Banerjee, S., Kawasaki, S., Nakashima, H., Higashijima, A.
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.02.2014
Subjects
Confinement
Electron pressure
energetic electron
Energy use
Magnetic fields
Magnetic mirrors
non-inductive current drive
Nuclear fusion
spherical tokamak
Tokamak devices
X-rays
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Summary: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).
Bibliography:International Atomic Energy Agency
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0029-5515
1741-4326
DOI:10.1088/0029-5515/54/2/023010