650 MHz双cell超导腔冷氦气自动降温方案研究

本文以先进光源技术研发与测试平台（PAPS）中的650 MHz双cell超导腔的降温过程为主要研究对象，采用准则关系式法及计算流体力学方法构建了整体换热模型并编程计算，得到了降温过程中超导腔所需的冷氦气入口腔前参数。根据腔前参数反推流程，考虑整体布局和局部阻力的损失，计算了兑温阀门开度与腔前参数的对应关系，从而可通过兑温阀门开度时刻表来实现整体降温过程的自动控制。

Research on Cold Helium Automatic Cooling Scheme of 650 MHz Double-cell Superconducting Cavity

In this paper, the cooling process of the 650 MHz double-cell superconducting cavity in Platform of Advanced Photon Source Technology R&D (PAPS) was taken as the main research object. The integral heat transfer model was constructed by using the criterion relation method and computational fluid dynamics (CFD) method, and the pre-inlet parameters of cold helium for superconducting cavity in the cooling process were obtained by programming calculation. According to the back-stepping process of the pre-inlet parameters, the relation between the opening percent of the temperature changing valve and the pre-inlet parameters was calculated with full consideration of the overall layout and local resistance loss. The automatic control of the whole cooling process can be realized by the timetable of the opening percent of the temperature changing valve.