Hillesheim J C, Holland C, Schmitz L, Kubota S, Rhodes T L, Carter T A
Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA.
Rev Sci Instrum. 2012 Oct;83(10):10E331. doi: 10.1063/1.4733549.
Doppler backscattering (DBS) is a plasma diagnostic used in tokamaks and other magnetic confinement devices to measure the fluctuation level of intermediate wavenumber (k(θ)ρ(s) ~ 1) density fluctuations and the lab frame propagation velocity of turbulence. Here, a synthetic DBS diagnostic is described, which has been used for comparisons between measurements in the DIII-D tokamak and predictions from nonlinear gyrokinetic simulations. To estimate the wavenumber range to which a Gaussian beam would be sensitive, a ray tracing code and a 2D finite difference, time domain full wave code are used. Experimental density profiles and magnetic geometry are used along with the experimental antenna and beam characteristics. An example of the effect of the synthetic diagnostic on the output of a nonlinear gyrokinetic simulation is presented.
多普勒背散射（DBS）是一种用于托卡马克及其他磁约束装置的等离子体诊断方法，用于测量中间波数（k(θ)ρ(s) ~ 1）密度涨落的波动水平以及湍流在实验室坐标系中的传播速度。这里描述了一种合成DBS诊断方法，它已被用于比较DIII-D托卡马克中的测量结果与非线性回旋动理学模拟的预测结果。为了估计高斯光束敏感的波数范围，使用了射线追踪代码和二维有限差分、时域全波代码。实验密度剖面和磁几何结构与实验天线及光束特性一起使用。给出了合成诊断对非线性回旋动理学模拟输出影响的一个示例。
