Li Y L, Xu G S, Tritz K, Zhu Y B, Wan B N, Lan H, Liu Y L, Wei J, Zhang W, Hu G H, Wang H Q, Duan Y M, Zhao J L, Wang L, Liu S C, Ye Y, Li J, Lin X, Li X L
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China.
Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.
Rev Sci Instrum. 2015 Dec;86(12):123512. doi: 10.1063/1.4938155.
A multi-energy soft x-ray (ME-SXR) diagnostic has been built for electron temperature profile in the edge plasma region in Experimental Advanced Superconducting Tokamak (EAST) after two rounds of campaigns. Originally, five preamplifiers were mounted inside the EAST vacuum vessel chamber attached to five vertically stacked compact diode arrays. A custom mechanical structure was designed to protect the detectors and electronics under constraints of the tangential field of view for plasma edge and the allocation of space. In the next experiment, the mechanical structure was redesigned with a barrel structure to absolutely isolate it from the vacuum vessel. Multiple shielding structures were mounted at the pinhole head to protect the metal foils from lithium coating. The pre-amplifiers were moved to the outside of the vacuum chamber to avoid introducing interference. Twisted copper cooling tube was embedded into the back-shell near the diode to limit the temperature of the preamplifiers and diode arrays during vacuum vessel baking when the temperature reached 150 °C. Electron temperature profiles were reconstructed from ME-SXR measurements using neural networks.
经过两轮实验，已在先进超导托卡马克实验装置（EAST）中构建了一种多能量软X射线（ME-SXR）诊断设备，用于测量边缘等离子体区域的电子温度分布。最初，五个前置放大器安装在EAST真空容器腔内，与五个垂直堆叠的紧凑型二极管阵列相连。设计了一种定制机械结构，以便在满足等离子体边缘切向视场和空间分配要求的条件下，保护探测器和电子设备。在下一次实验中，机械结构重新设计为桶形结构，使其与真空容器完全隔离。在针孔头部安装了多个屏蔽结构，以保护金属箔不被锂涂层污染。前置放大器移到了真空腔外部，以避免引入干扰。在二极管附近的后壳中嵌入了扭曲的铜冷却管，以便在真空容器烘烤温度达到150°C时，限制前置放大器和二极管阵列的温度。利用神经网络从ME-SXR测量结果中重建了电子温度分布。
