Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
Volume 463, Issue -, Pages 138-142Publisher
ELSEVIER
DOI: 10.1016/j.nimb.2019.06.007
Keywords
Storage ring; Isochronous mass spectrometry; Mass resolving power
Categories
Funding
- National Key R&D Program of China [2018YF A0404401, 2016YFA0400504]
- National Nature Science Foundation of China [11605249, 11605248, 11605252, 11505267, 11575112, 11575007]
- CAS External Cooperation Program [GJHZ1305]
- CAS through the Key Research Program of Frontier Sciences [QYZDJ-SSW-SLH005]
- Key Research Program of the Chinese Academy of Sciences [XDPB09]
- Helmholtz-CAS Joint Research Group [HCJRG-108]
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme [682841]
- CAS President's International Fellowship Initiative Grant [2016VMA 043]
- Nuclear Astrophysics Virtual Institute (NAVI) of the Helmholtz Association
- CAS Light of West China Program
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Isochronous Mass Spectrometry (IMS) in heavy-ion storage rings is an excellent experimental method for precision mass measurements of exotic nuclei. In the IMS, the storage ring is tuned in a special isochronous ion-optical mode. Thus, the mass-over-charge ratios of the stored ions are directly reflected by their respective revolution times in first order. However, the inevitable momentum spread of secondary ions increases the peak widths in the measured spectra and consequently limits the achieved mass precision. In order to achieve a higher mass resolving power, the ring aperture was reduced to 60 mm by applying a mechanical slit system at the dispersive straight section. The momentum acceptance was reduced as well as better isochronous conditions were achieved. The results showed a significant improvement of the mass resolving power reaching 5.2 x 10(5), though at the cost of about 40% ion loss.
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