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Gyrokinetic study of turbulence suppression in a JET-ILW power scan

机译：喷气机电力扫描中湍流抑制的热能研究

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For exploring tokamak operation regimes that deliver both high beta and good energy confinement, power scans at JET with ITER-like wall have been performed. Relatively weak degradation of the confinement time coincides with increased core temperature of the ions at high power. The changes in core turbulence characteristics during a power scan with an optimized (broad) q profile are analyzed by means of nonlinear gyrokinetic simulations. The increase in beta is crucial for stabilizing ion temperature gradient driven turbulence, accompanied by increased ion to electron temperature ratio, the presence of a dynamic fast ion species, as well as the geometric stabilization by increased thermal and suprathermal pressure. A sensitivity study with respect to the q profile reveals that electromagnetic effects are more pronounced at larger values of q. Further, it is confirmed that turbulence suppression due to rotation becomes less effective in such strongly electromagnetic systems. Electrostatic simplified models may thus perform well in present-day devices, in which high beta is often correlated with high rotation, but provide poor extrapolation towards low rotation devices. Implications for ITER and reactor plasmas are discussed.
机译：为了探索托卡马克既能提供高β又能提供良好能量约束的运行机制，已经在带有ITER壁的喷流上进行了功率扫描。限制时间相对较弱的退化与高功率下离子的核心温度升高相一致。通过非线性回转动力学模拟，分析了在优化（宽）q剖面的功率扫描过程中，堆芯湍流特性的变化。β的增加对于稳定离子温度梯度驱动的湍流至关重要，伴随着离子与电子温度比的增加、动态快离子物种的存在，以及通过增加热压力和超热压力实现几何稳定。关于q剖面的敏感性研究表明，q值越大，电磁效应越明显。此外，还证实，在这种强电磁系统中，由于旋转而产生的湍流抑制效果越差。因此，静电简化模型在当今的设备中可能表现良好，其中高β通常与高旋转相关，但对低旋转设备的推断较差。讨论了对ITER和反应堆等离子体的影响。

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