Using a double-frequency RF system to facilitate on-axis beam accumulation in a storage ring

Abstract

An on-axis injection scheme using a double-frequency RF system in a storage ring with small dynamic aperture is proposed. By altering RF voltages, empty RF buckets can be created which will be used for on-axis injection. After bunches are injected, a reverse RF voltage altering process is performed and the injected bunches can be longitudinally dumped to the main RF buckets. The scheme allows reaping the advantages of the on-axis injection while still performing accumulation.

Single-shot measurement of longitudinal phase space beam profile in an electron storage ring

“…Beam manipulation in the longitudinal phase can be used to generate coherent radiation (Ratner & Chao, 2010) and beam dynamics in the longitudinal phase space to enable exploration of a new injection scheme (Kim et al, 2019;Aiba et al, 2015;Jiang et al, 2016;Jiang & Xu, 2018;Kuske et al, 2020). These goals invoke a need to measure the longitudinal beam profile.…”

Design study of APS-U-type hybrid-MBA lattice for mid-energy DLSR

“…For such a small DA, an on-axis "swap-out" injection [38] or a longitudinal injection [e.g. [39][40][41][42][43] can be used for the beam injection. 1), the horizontal natural emittance ε 0 scales approximately as E 2 /N b 3 .…”

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“…研究表明, 将两种优化方法交替 使用, 其效果优于单独使用其中任何一种方法 [43] . [50,51] , 以及三高频频率的纵向注入方法 [52] . 其中, 三高频频率 纵向注入(图5(d)) [52] , 将基频腔与二次谐波腔、三次谐 波腔组合起来, 形成一个更大的相稳定区, 可以有效降 低对快速冲击器脉宽的要求.…”