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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：为了探索提供高β和良好能源限制的托卡马克操作制度，已经进行了艾特样墙的喷气机的电力扫描。限制时间的相对较弱的降解与高功率高的离子的核心温度增加一致。通过非线性陀螺模拟分析了具有优化（广泛的）Q轮廓的功率扫描期间的核心湍流特性的变化。对于稳定离子温度梯度驱动的湍流，β的增加是至关重要的，伴随着电温度比增加，动态快速离子物质的存在，以及通过增加的热和上班压力的几何稳定性。关于Q型谱的敏感性研究揭示了电磁效应在Q的较大值下更明显。此外，证实，在这种强电磁系统中，由于旋转而导致的湍流抑制变得较低。因此，静电简化模型可以在本日设备中表现良好，其中高β通常与高旋转相关，但为低旋转装置提供较差的外推。讨论了对艾尔和反应堆等离子体的影响。

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