Parametric dependencies of locked mode thresholds in KSTAR L-mode plasmas

Resonant error fields with toroidal harmonics n = 1 and n = 2 in otherwise axisymmetric tokamak plasmas can drive disruptive locked modes when their strength exceeds a threshold value. This paper presents the sensitivity of error field threshold in global parameters such as line-averaged density and...

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Bibliographic Details
Published in:Nuclear fusion 2021-08, Vol.61 (8), p.86009
Main Authors: Yang, S.M., Park, J.-K., Na, Y.S., In, Y., Hahn, H., Jeon, J.W., Yoo, J.W., Ko, W.H., Lee, K.D., Lee, J.H., Lee, J.W., Hong, S.C., Shi, Y.J., Logan, N.C., Hu, Q., Choi, G.J.
Format: Article
Language:English
Subjects:
2 locking
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
error field
error field threshold
mode locking
tokamak
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Summary:Resonant error fields with toroidal harmonics n = 1 and n = 2 in otherwise axisymmetric tokamak plasmas can drive disruptive locked modes when their strength exceeds a threshold value. This paper presents the sensitivity of error field threshold in global parameters such as line-averaged density and toroidal magnetic field as well as toroidal harmonics dependence in KSTAR L-mode plasmas. The error field threshold for mode-locking increases along with density up to a roll-over density, which coincides well with the linear ohmic confinement (LOC) to saturated ohmic confinement (SOC) density for the studied KSTAR plasmas. As a result, this non-monotonic density correlation of the error field threshold in LOC–SOC can be explained by a modification of existing theoretical scaling in SOC, while plasma rotation can also play an important role in setting the resonant error field threshold.
ISSN:0029-5515
1741-4326
DOI:10.1088/1741-4326/ac0165