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Title: Influence of plasma boundary shape on helical core/long-lived mode in tokamak plasmas
Authors: Nakamura, Y.
Ishizawa, A.
Ishida, Y.
Author's alias: 中村, 祐司
石澤, 明宏
Issue Date: Sep-2020
Publisher: AIP Publishing
Journal title: Physics of Plasmas
Volume: 27
Issue: 9
Thesis number: 092509
Abstract: Helical distortion of the core part of tokamak plasma, which is called a helical core or a long-lived mode, is investigated by means of three-dimensional magnetohydrodynamic equilibrium calculations. It is found that the magnitude of the helical distortion strongly depends on the shape of the plasma boundary for weakly reversed shear plasmas. The triangularity of the boundary enhances the amplitude of helical distortion. In addition, reversed D-shape plasmas also exhibit a helical core. It is also found that the triangularity lowers the critical β for the onset of a helical core; furthermore, the critical β vanishes when the triangularity exceeds a certain value. On the other hand, the influence of the ellipticity on the amplitude of helical distortion strongly depends on β. The ellipticity enhances the amplitude at high β, while it reduces the amplitude at low β.
Rights: This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Physics of Plasmas 27, 092509 (2020) and may be found at
The full-text file will be made open to the public on 23 September 2021 in accordance with publisher's 'Terms and Conditions for Self-Archiving'.
DOI(Published Version): 10.1063/5.0013652
Appears in Collections:Journal Articles

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