Current status of ECE system on EAST tokamak

Zhao, Hailin; Ti, Ang; Zhou, Tianfu; Zhang, Zhu; Liu, Yong; Ling, Bili; Zang, Qing; Huang, Juan; Gong, Xianzu

doi:10.1051/epjconf/202327703007

Cited by 1 publication

(1 citation statement)

References 14 publications

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“…schematically. Here α is a constant value provided by ECE (electron cyclotron emission) [41,42], and hence it accounts for the distance between the two ECE channels, which is less than 2cm in EAST experiments, resulting in a constant error value of less than 40%. Being constant, α does not impact the qualitative behaviour of 2wc as a function of β ϑ observed in experiment but might quantitatively influence the entire functional dependence.…”

Section: Threshold Island Widthmentioning

confidence: 99%

Drift kinetic theory of neoclassical tearing modes in tokamak plasmas: polarisation current and its effect on magnetic island threshold physics

Dudkovskaia,

Connor,

Dickinson

et al. 2023

Nucl. Fusion

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A nonlinear 4-dimensional drift island theory derived in [K Imada et al. Nucl. Fusion 59 (2019) 046016 and references therein] provides qualitative predictions of the plasma response to a stationary neoclassical tearing mode (NTM) magnetic island in a low beta, large aspect ratio tokamak plasma. [A V Dudkovskaia et al. Plasma Phys. Control. Fusion 63 (2021) 054001] refines a model for the magnetic drift frequency and exploits the limit of rare collisions, reducing this theory to 3-dimensional and thus providing a more accurate treatment of the trapped-passing boundary layer. The drift island theory is further improved in [A V Dudkovskaia et al. Nucl. Fusion 63 (2023) 016020] by introducing plasma shaping and finite beta effects. In the present paper, an improved model is adopted to resolve the drift island separatrix boundary layer, allowing one to investigate the polarisation current contribution that exists around the magnetic island separatrix, including in the presence of the background electric field. In particular, different magnetic topologies from both sides of the separatrix generate a radial discontinuity in the distribution function gradient there, when collisions are neglected. Allowing for collisional dissipation in the leading order distribution function around the separatrix resolves this discontinuity, smoothing the density distribution. The overall effect of the polarisation current on the NTM threshold is then combined from the outer contributions that exist outside the layer, as well as the separatrix layer piece, and self-consistently accounts for the electrostatic potential reconstructed from plasma quasi-neutrality. The corresponding NTM threshold is quantified and compared with previous predictions of [A V Dudkovskaia et al. Plasma Phys. Control. Fusion 63 (2021) 054001, A V Dudkovskaia et al. Nucl. Fusion 63 (2023) 016020].

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Section: Threshold Island Widthmentioning

confidence: 99%