Improving the resolving power of Isochronous Mass Spectrometry by employing an 
in-ring mechanical slit

Liu, J. H.; Xu, X.; Zhang, P.; Shuai, P.; Yan, X. L.; Zhang, Y. H.; Wang, M.; Litvinov, Y. A.; Xu, H. S.; Blaum, K.; Bao, T.; Chen, H.; Chen, X. C.; Chen, R. J.; Fu, C. Y.; Liu, D. W.; Ge, W. W.; Mao, R. S.; Ma, X. W.; Sun, M. Z.; Tu, X. L.; Xing, Y. M.; Yang, J. C.; Yuan, Y. J.; Zeng, Q.; Zhou, X.; Zhou, X. H.; Zhan, W. L.; Litvinov, S.; Uesaka, T.; Yamaguchi, Y.; Yamaguchi, T.; Ozawa, A.; Sun, B. H.

doi:10.1016/j.nimb.2019.06.007

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Improving the resolving power of Isochronous Mass Spectrometry by employing an in-ring mechanical slit

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Litvinov, Y. A.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Blaum, K.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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https://doi.org/10.1016/j.nimb.2019.06.007
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Liu, J. H., Xu, X., Zhang, P., Shuai, P., Yan, X. L., Zhang, Y. H., et al. (2020). Improving the resolving power of Isochronous Mass Spectrometry by employing an in-ring mechanical slit. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 463, 138-142. doi:10.1016/j.nimb.2019.06.007.

Cite as: https://hdl.handle.net/21.11116/0000-0005-A3C1-8

Abstract

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 10⁵ , though at the cost of about 40% ion loss.