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

Nuclear Fushion

article

Kimin Kim¹  Jisung Kang¹  Hyunseok Kim¹  Sumin Yi¹  Jeongwon Yoo²  Minjun Choi¹  Tongnyeol Rhee¹  Junghee Kim¹  Myungwon Lee²  Won-Ha Ko¹  Jaemin Kwon¹ 

[1] Korea Institute of Fusion Energy;Korea Advanced Institute of Science and Technology

关键词: 3D magnetic field;    plasma response;    magnetic braking;    tokamak;    improved confinement;   

DOI  :  10.1088/1741-4326/acc3ad

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

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 andE   ×   Bshear flow by magnetic braking provoke an enhanced pedestal to sustain thermal confinement against degradation in the typical 3D field experiment.

【 授权许可】

Unknown