STORI'24: Recent developments at the Rare-RI Ring facility

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Abstract The Rare-RI Ring (R3) is an isochronous storage ring for the purpose of deriving the masses of extremely short-lived rare RIs by applying TOF measurement method. Since the successful commissioning experiment in 2015, the technical developments have been continued to improve the efficiency and precision for mass measurements. Through initial experiments using unstable nuclei with well-known masses conducted up to 2017, the mass derivation method was established [1]. After, experiments for unknown masses were started because realistic extraction yield and precise isochronous condition were achieved. Recent developments to further improve the efficiency of mass measurement, which were carried out in parallel with the experiments represented in [2], are described below.
The improved kicker system can perform an extraction kick with a long duration equal to revolution time of the ring. In addition to shortening the measurement time, it is essential for extracting extremely rare events whose extraction timing cannot be specified. It has been found that the extraction yields can be dramatically improved by tuning the injection optics with the vertical steering magnets. In addition, a new Schottky detector is able to detect single events in timeframes on the order of milliseconds. It will be useful not only for beam diagnostics of short-lived rare RIs, but also for lifetime measurement experiments for rare RIs planned as a future application of R3. Details of these developments will be presented.

References
[1] D. Nagae et al., Phys. Rev. C 110, 014310 (2024).
[2] H.F. Li et al., Phys. Rev. Lett. 128, 152701 (2022).