Uzun-Kaymak I U, Fonck R J, McKee G R, Schoenbeck N, Smith D, Winz G, Yan Z
Engineering Physics, University of Wisconsin-Madison, Wisconsin 53706, USA.
Rev Sci Instrum. 2010 Oct;81(10):10D714. doi: 10.1063/1.3479114.
A dual-channel high-efficiency, high-throughput custom spectroscopic system has been designed and implemented at DIII-D to measure localized ion thermal fluctuations associated with drift wave turbulence. A large-area prism-coupled transmission grating and high-throughput collection optics are employed to observe C VI emission centered near λ=529 nm. The diagnostic achieves 0.25 nm resolution over a 2.0 nm spectral band via eight discrete spectral channels. A turbulence-relevant time resolution of 1 μs is achieved using cooled high-speed avalanche photodiodes and ultralow-noise preamplifiers. The system sensitivity is designed to provide measurements of normalized ion temperature fluctuations on the order of δT(i)/T(i)≤1%.
在DIII-D装置上设计并实现了一种双通道高效、高通量的定制光谱系统，用于测量与漂移波湍流相关的局部离子热涨落。采用大面积棱镜耦合透射光栅和高通量收集光学器件来观测中心波长接近λ=529nm的CⅥ发射。该诊断系统通过八个离散光谱通道在2.0nm光谱波段内实现了0.25nm的分辨率。使用冷却的高速雪崩光电二极管和超低噪声前置放大器实现了与湍流相关的1μs时间分辨率。系统灵敏度设计为能够测量归一化离子温度涨落，其量级为δT(i)/T(i)≤1%。
