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首页> 外文期刊>Plasma physics and controlled fusion >Nonlinear MHD simulations of QH-mode DIII-D plasmas and implications for ITER high Q scenarios
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Nonlinear MHD simulations of QH-mode DIII-D plasmas and implications for ITER high Q scenarios

机译：QH模式DIII-D等离子体的非线性MHD模拟和迭代高Q场景的影响

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摘要

In nonlinear MHD simulations of DIII-D QH-mode plasmas it has been found that low n kink/peeling modes (KPMs) are unstable and grow to a saturated kink-peeling mode. The features of the dominant saturated KPMs, which are localised toroidally by nonlinear coupling of harmonics, such as mode frequencies, density fluctuations and their effect on pedestal particle and energy transport, are in good agreement with the observations of the edge harmonic oscillation typically present in DIII-D QH-mode experiments. The nonlinear evolution of MHD modes including both kink-peeling modes and ballooning modes, is investigated through MHD simulations by varying the pedestal current and pressure relative to the initial conditions of DIII-D QH-mode plasma. The edge current and pressure at the pedestal are key parameters for the plasma either saturating to a QH-mode regime or a ballooning mode dominant regime. The influence of E x B flow and its shear on the QH-mode plasma has been investigated. E x B flow shear has a strong stabilisation effect on the medium to high-n modes but is destabilising for the n = 2 mode. The QH-mode extrapolation results of an ITER Q = 10 plasma show that the pedestal currents are large enough to destabilise n = 1-5 KPMs, leading to a stationary saturated kink-peeling mode.
机译：在非线性MHD模拟DIII-D QH模式等离子体中，已经发现，低N扭结模式（KPMS）不稳定并且成长为饱和的扭结模式。通过谐波的非线性耦合，诸如模式频率，密度波动及其对基座粒子和能量传输的影响的非线性耦合，与通常存在的边缘谐波振荡的观察结果非常一致地DIII-D QH模式实验。通过改变基座电流和相对于DIII-D QH模式等离子体的初始条件，通过MHD模拟来研究包括扭剥模式和膨胀模式的MHD模式的非线性演化。底座的边缘电流和压力是饱和QH模式制度的等离子体的关键参数或膨胀模式主导地区。研究了E X B流动及其剪切对QH模式等离子体的影响。 E X B流量剪切对介质的强稳定效应至高N模式，但对N = 2模式不稳定。近迭代Q = 10等离子体的QH模式外推结果表明基座电流足够大以使n = 1-5千克稳定，导致静止饱和的扭结模式。

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