—、引言 高能物理实验中所用大型谱仪的气体供应是一个重要而复杂的问题。气体质量的好坏会影响谱仪中气体介质探测器的性能,气体中杂质的种类及含量影响着谱仪的寿命,尘埃粒子的多少关系到探测器的内部放电,易燃易爆成分的渗漏将威胁整个实验大厅内仪器设备和工作人员的安全。因此,世界上各高能物理实验室,包括我国正负电子对撞机上的 -, Introduction The gas supply to large spectrometers used in high energy physics experiments is an important and complex issue. The quality of the gas will affect the performance of the gas medium detector in the spectrometer. The type and content of impurities in the gas affect the life of the spectrometer. The amount of dust particles is related to the internal discharge of the detector and the infiltration of flammable and explosive components Leaks will threaten the safety of instrumentation and personnel throughout the experiment hall. Therefore, the world’s high-energy physics laboratories, including our positive and negative electron collider