Observation of improved confinement by non-axisymmetric magnetic field in KSTAR

Abstract We report the observation of improved confinement discharge in a magnetic braking experiment in the KSTAR tokamak. The improved confinement is achieved with reduced toroidal plasma rotation by non-axisymmetric magnetic field induced toroidal rotation braking along with significant reduction...

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Bibliographic Details
Published in:	Nuclear fusion Vol. 63; no. 6; pp. 66003 - 66010
Main Authors:	Kim, Kimin, Kang, Jisung, Kim, Hyunseok, Yi, Sumin, Yoo, Jeongwon, Choi, Minjun, Rhee, Tongnyeol, Kim, Junghee, Lee, Myungwon, Ko, Won-Ha, Kwon, Jaemin
Format:	Journal Article
Language:	English
Published:	IOP Publishing 01-06-2023
Subjects:	3D magnetic field improved confinement magnetic braking plasma response tokamak
Online Access:	Get full text
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Summary:	Abstract We report the observation of improved confinement discharge in a magnetic braking experiment in the KSTAR tokamak. The improved confinement is achieved with reduced toroidal plasma rotation by non-axisymmetric magnetic field induced toroidal rotation braking along with significant reduction of edge localized modes (ELMs). Modifications in multi-channel transport raise fast ion slowing-down time and improve neutral beam deposition, leading to improved fast ion confinement. We show that modifications of radial electric field and E × B shear flow by magnetic braking provoke an enhanced pedestal to sustain thermal confinement against degradation in the typical 3D field experiment.
Bibliography:	NF-105997
ISSN:	0029-5515 1741-4326
DOI:	10.1088/1741-4326/acc3ad