A circulating hydrogen ultra-high purification system for the MuCap experiment

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment(2007)

引用 28|浏览16
暂无评分
摘要
The MuCap experiment is a high-precision measurement of the rate for the basic electroweak process of muon capture, μ−+p→n+νμ. The experimental approach is based on an active target consisting of a time projection chamber (TPC) operating with pure hydrogen gas. The hydrogen has to be kept extremely pure and at a stable pressure. A Circulating Hydrogen Ultra-high Purification System was designed at the Petersburg Nuclear Physics Institute (PNPI) to continuously clean the hydrogen from impurities. The system is based on an adsorption cryo pump to stimulate the hydrogen flow and on a cold adsorbent for the hydrogen cleaning. It was installed at the Paul Scherrer Institute (PSI) in 2004 and performed reliably during three experiment runs. During several months long operating periods the system maintained the hydrogen purity in the detector on the level of 20ppb for moisture, which is the main contaminant, and of better than 7 and 5ppb for nitrogen and oxygen, respectively. The pressure inside the TPC was stabilized to within 0.024% of 10bar at a hydrogen flow rate of three standard liters per minute.
更多
查看译文
关键词
29.40.Cs,07.20.Mc,23.40.−s
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要