低真空测量光学谐振腔的设计与分析

基于磁约束核聚变运行真空测量需求和强磁场高辐照运行环境要求,本文设计了一种光学真空测量手段,介绍了该方法的原理,结合理论计算与有限元仿真,模拟分析了温度、气压和振动等主要因素对光学谐振腔测量不确定度的影响,并提出优化方案,验证了光学谐振腔应用于聚变环境测量的可行性。本研究为光学谐振腔的工程化设计提供了理论指导与依据,也为优化提高测量装置精确度提供了可行性方案。     

The Design and Test of a Be Window for the ITER Radial X-Ray Camera

Beryllium(Be) window is a key component of the ITER radial X-ray camera(RXC).The Be window presented in this paper has a mechanical clamping structure, the thickness of the Be foil is 80 μm, and the X-ray threshold of the 80 μm Be foil is 1.24 keV. A honeycomb support is designed and applied to strengthen the Be foil to prevent it from breakage when it is exposed to1 atm perssure. Based on analysis results, the hole diameter of the support is chosen as 4 mm. A metal seal is used to isolate the vacuum on two sides of the Be window, the hollow metal sealing ring ensures the He leakage rate of the Be window being lower than 6×10-10Pa·m3·s-1. Baking(240°C, 2 h) and vibration(3.3 Hz, 2 h) tests are carried out and the feasibility of the Be window's sealant in these situations is tested. The Be window has good stability that can save maintenance cost as well as enhancing the safety of the RXC.     

EAST窗口插件式低温泵热辐射特性的数值模拟研究

EAST窗口插件式低温泵是用于偏滤器粒子排出的重要部件,辐射热负荷对其抽气性能具有显著影响。本文首先设计了基于不同挡板形式的低温泵主要结构,并用仿真软件COMSOL分析低温板所受的辐射热。结果表明采用百叶窗挡板时低温板的辐射热负荷是人字型挡板的三倍左右,对照分析得到较为合理的挡板结构;对低温泵的表面处理方法进行探究,发现冷屏内壁抛光和发黑对低温板所受辐射热负荷的影响基本相当,但相比发黑,抛光可降低冷屏所受的辐射热量。在对低温板辐射热负荷的影响不大的前提下,对辐射挡板部分表面抛光可使其所受辐射热量比全部表面发黑处理减小40%左右。最后分析了挡板阵列和低温板阵列辐射热负荷的分布情况,为其冷却结构设计提供指导。研究为EAST窗口插件式低温泵的研发提供数据参考和设计依据。