【摘要】 为了保障中国散裂中子源(CSNS)低温系统的平稳、顺利降温,减小降温过程中的压力波动,避免放气造成冷源的损失和温度的反复,研究了低温系统近两年多轮降温实验的降温曲线和数据,逐渐优化了氢降温控制逻辑。通过制冷机控制软件的升级和控制逻辑的修改,实现了300—34 K的平稳降温,使降温过程由完全不可控提升到了半可控阶段。通过34 K以下降温控制逻辑的修改和优化,实现了氢循环34—16 K的平稳降温,使整个降温过程完全平稳、可控。因此,经过长达两年的氢降温优化研究,终于找到了一种可靠的超临界氢降温方法,成功实现了CSNS低温系统的平稳、顺利降温。更多还原

【Abstract】 In order to ensure the stable and smooth cooling of cryogenic system of China Spallation Neutron Source(CSNS),reduce the pressure fluctuation during cooling,and avoid the loss of cold source and temperature repetition caused by outgassing,the cooling curves and data of several rounds of cooling experiments in recent two years were studied,and the control logic of hydrogen cooling was gradually optimized. By upgrading the control software and modifying the control logic of the refrigerator,the steady cooling of 300-34 K is realized,which makes the cooling process from completely uncontrollable to semi controllable. By modifying and optimizing the control logic below 34 K,the steady cooling of 34-16 K in hydrogen cycle is realized,and the whole cooling process is completely stable and controllable. Therefore,after two years of research on optimization of hydrogen cooling, a reliable method of supercritical hydrogen cooling was finally found,and the stable and smooth cooling of CSNS cryogenic system was successfully realized.更多还原