期刊
PHYSICAL REVIEW ACCELERATORS AND BEAMS
卷 24, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevAccelBeams.24.042802
关键词
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资金
- National Key R&D Program of China [2016YFA0400504, 2018YFA0404401]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB34000000]
- NSFC [1905261, 11805032, 11975280, 11605248]
- CAS Light of West China Program
- China Postdoctoral Science Foundation [2019M660250]
- FRIB-CSC Fellowship, China [201704910964]
- Office of China Postdoctoral Council
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program [682841]
- JSPS
- NSFC
Isochronous mass spectrometry based on heavy-ion storage rings allows for direct mass measurements of short-lived nuclei, utilizing time-of-flight detectors to accurately determine the velocity of each stored ion for high mass resolving power within a limited range.
Isochronous mass spectrometry based on heavy-ion storage rings is a powerful tool for direct mass measurements of very short-lived nuclei. Owing to the nature of in-flight separation of high-energy reaction products, many ion species with different mass-to-charge ratios (m/q) can be transmitted to and stored in the ring in one shot. However, high mass resolving power can be achieved only for a limited range of ion species with velocities well matching the isochronous condition of the ring. The knowledge of velocities of each stored ions is required to overcome this restriction. For this purpose, two time-of-flight (TOF) detectors were installed 18 m apart in one straight section of the cooler-storage ring CSRe in Lanzhou. The time sequences measured by the two TOF detectors for each stored ion were used for the precision determination of its velocity. A relative precision of the velocity is achieved to the level of 10(-5) for individual ions. The betatron oscillations of the ion motion in the ring were clearly identified in the data and were taken into account in the analysis. The presented technique can be used for measurements of machine tunes and their dependence on particle momenta.
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