【摘要】 先进光源技术研发与测试平台(PAPS)2 K超流氦低温系统流程设计与计算需根据系统热负荷以及功能需求,进行方案设计和管道的规格选型,确定氦制冷机制冷能力。使用关联式编程计算方法对PAPS氦低温系统进行了流程模拟和计算,确定了2 K超流氦的获得方式,并研究了不同的节流前温度与节流效率以及相分离器供液质量流量的关系,重点介绍超导腔的垂直测试站流程计算结果。经过流程计算可得:氦制冷机制冷能力选择2 500 W@4.5 K,5 000 L液氦储存杜瓦需为3个站点设备端提供21.52 g/s的1.3×10~5Pa饱和液氦。主供液管内径选择23 mm,主回气管内经选择250 mm,超导腔氦池回气至减压降温泵入口的沿程阻力为195.12 Pa,不超过200 Pa,管道选型合适,能够满足要求。更多还原

【Abstract】 The process design and calculation of Platform of Advanced Photon Source(PAPS) 2 K superfluid helium cryogenic system should be determined the to the system heat load and functional requirements. In this paper, the process calculation of PAPS helium cryogenic system is simulated and calculated by using the correlation programming method, and the way to obtain 2 K superfluid helium is determined. The relationship between different temperature before Joule-Tomson(JT) throttling and throttling efficiency as well as the mass flow rate of the phase separator was studied. The process calculation results of the vertical test station for the superconducting cavity are mainly introduced. According to the process calculation, the following conclusions can be obtained:(1) The of refrigeration capacity of helium refrigerator is 2 500 W@ 4. 5 K,and the 5 000 L liquid helium storage Dewar shall provide 1. 3 × 105 Pa saturated liquid helium with mass flow rate of 21. 52 g/s for the equipment end of three test stations.(2) The inner diameter of the main liquid supply transfer line is 23 mm, the inner diameter of the main return transfer line is 250 mm, and the resistance from the return gas of the helium vessel of the superconducting cavity to the inlet of the room temperature vacuum pump station is 195. 12 Pa, which is not more than 200 Pa. The selections of the transfer lines are appropriate and can meet the requirements.更多还原