Lee M W, Lim S, Jeong W, Kim S, Kim J H, Hwang Y S, Sung C
Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea.
Department of Energy Systems Engineering, Seoul National University, Seoul 08826, Republic of Korea.
Sensors (Basel). 2023 Oct 10;23(20):8357. doi: 10.3390/s23208357.
A multichannel soft X-ray (SXR) array has been developed to measure the electron temperature in the Versatile Experiment Spherical Torus (VEST). To estimate electron temperature using the two-filter method applied to SXR intensity, we designed a pinhole camera that has two photodiode arrays with different metallic filters. We also adopted a filter wheel and tested various filter parameters to find the optimal filter set. Through tests, the combination of aluminum and beryllium was found to be the most suitable for the current experimental conditions in VEST. The filtered SXR signals were acquired with a low-noise preamplifier, exhibiting sufficient signal-to-noise ratios for electron temperature estimation based on the intensity ratio of two signals obtained with different filters. The estimated electron temperature from the developed two-filter SXR array showed reasonably matched levels and consistent trends with Thomson scattering measurements. Error contribution from impurity line emission is also discussed.
已开发出一种多通道软X射线（SXR）阵列，用于测量通用实验球形环面（VEST）中的电子温度。为了使用应用于SXR强度的双滤光片方法估计电子温度，我们设计了一种针孔相机，它具有两个带有不同金属滤光片的光电二极管阵列。我们还采用了一个滤光轮，并测试了各种滤光片参数以找到最佳滤光片组。通过测试，发现铝和铍的组合最适合VEST当前的实验条件。用低噪声前置放大器采集经过滤的SXR信号，基于用不同滤光片获得的两个信号的强度比，该信号具有足够的信噪比用于电子温度估计。从开发的双滤光片SXR阵列估计的电子温度显示出与汤姆逊散射测量结果相当匹配的水平和一致的趋势。还讨论了杂质线发射的误差贡献。
