EAST ICRF天线法拉第屏蔽的热-结构分析
Thermal-Structural Analysis of EAST ICRF Antenna Faraday Shield
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摘要: 在EAST ICRF天线中，法拉第屏蔽是ICRF天线中的一个非常重要的部件。实验时，它位于真空室内直接面对等离子体，将承受着很大的热负荷。基于EAST ICRF天线法拉第屏蔽结构的安全性，本文利用有限元的方法，首先对热负荷最大的法拉第屏蔽冷却管道在不同水流速下进行热分析，考察在不同水流速工况下法拉第屏蔽冷却管道上的温度分布情况，再通过热结构耦合方法对法拉第屏蔽冷却管道进行结构分析，了解法拉第屏蔽在不同水流速下的应力大小和分布情况，分析结果为未来EAST ICRF天线实验提供理论指导。另外，对法拉第屏蔽冷却管道结构进行了优化改进，并对优化改进后的法拉第屏蔽冷却管道在相同工况下进行了热和热结构分析，分析结果确定了优化改进后的法拉第屏蔽冷却管道结构的优越性，分析数据为未来法拉第屏蔽冷却管道的优化改进提供理论指导，分析方法为其他同类装置提供有益的参考。Abstract: The Faraday shield is one of the important components in the ion cyclotron resonance frequency (ICRF) heating antenna of EAST. In the physical experiment process, the Faraday shield which is located in the vacuum chamber facing plasma, will endure high heat loads. In consideration of the structural safety of the Faraday shield of EAST ICRF antenna, the thermal analysis for the actively cooled tube of the Faraday shield was performed using the finite element method (FEM) under different cooling water velocities. The results of temperature distribution on the Faraday shield tube under different water velocities were presented and studied. Then the structural analysis for the Faraday shield cooled tube was done applying the thermal-structural coupling method. The results of stresses and displacements on the Faraday shied tube under different water velocities were obtained and studied. Results of the stresses and displacements on the Faraday shield cooled tube will provide theoretical guidance for physical experiments in the future. In addition, the structure of the Faraday shield cooled tube was optimized, and the same analyses were performed for the new Faraday shield tube using the identical methods under the same conditions. Results of the analysis demonstrate that the new Faraday shield tube is better than the original one, and will provide theoretical guidance for the optimization of Faraday shield cooled tube in the future. The methods of analysis will also give a useful reference for the other similar devices.
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Keywords:
- ICRF antenna ,
- Faraday shield ,
- cooled tube ,
- thermal analysis ,
- thermal-structural coupling method
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