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首页> 外文期刊>Plasma physics and controlled fusion >Quantitative comparisons of electron-scale turbulence measurements in NSTX via synthetic diagnostics for high-k scattering
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Quantitative comparisons of electron-scale turbulence measurements in NSTX via synthetic diagnostics for high-k scattering

机译：通过高k散射的合成诊断测量NSTX电子速率湍流测量的定量比较

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摘要

Two synthetic diagnostics are implemented for the high-k scattering system in NSTX (Smith et al 2008 Rev. Sci. Instrum. 79 123501) allowing direct comparisons between the synthetic and experimentally detected frequency and wavenumber spectra of electron-scale turbulence fluctuations. Synthetic diagnostics are formulated in real-space and in wavenumber space, and are deployed in realistic electron-scale simulations carried out with the GYRO code (Candy and Waltz 2003 J. Comput. Phys. 186 545). A highly unstable electron temperature gradient (ETG) mode regime in a modest-beta NSTX NBI-heated H-mode discharge is chosen for the analysis. Mapping the measured wavenumbers to field aligned coordinates shows that the high-k system is sensitive to fluctuations that are closer to the spectral peak in the density fluctuation wavenumber spectrum (streamers) than originally predicted. The analyses of synthetic spectra show that the frequency response of the detected fluctuations is dominated by Doppler shift and is insensitive to the turbulence drive. The shape of the high-k density fluctuation wavenumber spectrum is sensitive to the ETG turbulence drive conditions, and can be reproduced in a sensitivity scan of the most pertinent turbulent drive terms in the simulation.
机译：在NSTX中的高k散射系统实施了两个合成诊断（Smith等人2008年SCI。79 123501），允许在综合和实验检测的频率和波数频率波动之间直接比较。合成诊断在现实空间和波数空间中配制，并在与陀螺码（Candy和Waltz 2003 J.Comput）进行的现实电子级模拟中部署。186 545）。选择在适度βNSTXNBI加热的H模式放电中的高度不稳定的电子温度梯度（ETG）模式制度用于分析。将测量的波纹贴图映射到场对准的坐标，表明高k系统对比最初预测的密度波动波数谱（飘带）更靠近光谱峰值的波动敏感。合成光谱的分析表明，检测到的波动的频率响应由多普勒移位支配，并且对湍流驱动不敏感。高k密度波动波数谱的形状对ETG湍流驱动条件敏感，并且可以在模拟中最相关的湍流驱动术语的灵敏度扫描中再现。

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