Evaluation of ECCD power requirement for neoclassical tearing modes suppression in the CFETR hybrid scenario

He, Lihua; Zheng, Pingwei; Yu, T.

doi:10.1016/j.net.2023.04.046

Cited by 1 publication

(1 citation statement)

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“…[3] Because the current driven by EC waves is highly localized, it is the most effective way to suppress NTMs by using EC wave to drive non-inductive current in the same direction as plasma current near the O-point of the magnetic island. However, when the deposition position of co-ECCD, which is in the same direction as the plasma current, is significant distance away from the O-point of the magnetic island or the resonant magnetic surface, the effect of inhibiting NTMs is not only very limited, [16][17][18][19] but even further promotes the growth of NTM magnetic island.…”

Section: Introductionmentioning

confidence: 99%

Effects of counter-current driven by electron cyclotron waves on neoclassical tearing mode suppression

Gao 高,

Zheng 郑

2024

Chinese Phys. B

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Through theoretical analysis, this paper constructs a physical model that includes the influence of counter-external driven current opposite to the plasma current direction on the neoclassical tearing mode (NTM). The equation is used with this model to get the modified Rutherford equation with co- and counter-current contributions. Consistent with the reported experimental results, numerical simulations have shown that the localized counter external current can only partially suppress NTM when it is far from the resonant magnetic surface. Under some circumstances, the Ohkawa mechanism dominated (OKCD) of electron cyclotron waves can concurrently create both co- and counter-current. In this instance, the minimal electron cyclotron wave power that suppresses a particular NTM was calculated by the Rutherford equation. The result is marginally less than when taking co-current alone into consideration. As a result, to suppress NTM using OKCD, one only needs to align the co-current with a greater OKCD peak well with the resonant magnetic surface; the effect of its lower counter-current need not be considered because the location of the counter-current deviates greatly from the resonant magnetic surface.

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