通过DIII-D托卡马克上的交叉极化散射和多普勒背散射同时测量磁涨落和密度涨落。
Simultaneous measurement of magnetic and density fluctuations via cross-polarization scattering and Doppler backscattering on the DIII-D tokamak.
作者信息
Rhodes T L, Barada K, Peebles W A, Crocker N A
机构信息
Physics and Astronomy Department, University of California, Los Angeles, California 90098, USA.
出版信息
Rev Sci Instrum. 2016 Nov;87(11):11E726. doi: 10.1063/1.4960601.
An upgraded cross-polarization scattering (CPS) system for the simultaneous measurement of internal magnetic fluctuations B̃ and density fluctuations ñ is presented. The system has eight radial quadrature channels acquired simultaneously with an eight-channel Doppler backscattering system (measures density fluctuations ñ and flows). 3-D ray tracing calculations based on the GENRAY ray tracing code are used to illustrate the scattering and geometric considerations involved in the CPS implementation on DIII-D. A unique quasi-optical design and IF electronics system allow direct comparison of B̃ and ñ during dynamic or transient plasma events (e.g., Edge Localized Modes or ELMs, L to H-mode transitions, etc.). The system design allows the interesting possibility of both magnetic-density (B̃-ñ) fluctuation and magnetic-temperature (B̃-T̃) fluctuation cross-phase measurements suitable for detailed tests of turbulence simulations.
本文介绍了一种用于同时测量内部磁涨落B̃和密度涨落ñ的升级型交叉极化散射（CPS）系统。该系统有八个径向正交通道，与一个八通道多普勒背散射系统（测量密度涨落ñ和流）同时采集数据。基于GENRAY射线追踪代码的三维射线追踪计算用于说明在DIII-D上实施CPS时涉及的散射和几何考虑因素。独特的准光学设计和中频电子系统允许在动态或瞬态等离子体事件（如边缘局域模或ELMs、L到H模转换等）期间直接比较B̃和ñ。该系统设计允许进行磁密度（B̃-ñ）涨落和磁温度（B̃-T̃）涨落交叉相位测量，这对于湍流模拟的详细测试来说是一种有趣的可能性。
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