Studies of transverse single-bunch instabilities in booster synchrotrons

Studies of transverse single-bunch instabilities in booster synchrotrons
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助推同步加速器横向单束不稳定性研究

DOI：
10.1016/j.nima.2019.06.048
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发表时间：
2019-10
期刊：
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
影响因子：
--
通讯作者：
Na Wang
Na Wang
中科院分区：
其他
文献类型：
--
作者：
Haisheng Xu;Yuemei Peng;Na Wang

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提供全电荷束团的能力已成为超低发射度储存环同步辐射光源中许多助推器的重要要求。横向单束团不稳定性可能会限制单束团装药在这些类型的助推器。相对较弱的同步辐射阻尼使得束团在注入能量处比在提取能量处更不稳定。因此，研究的横向单束团不稳定性进行了第一次在注入能量，与色度变化，以了解如何相应的阈值变化。我们的研究表明，当所使用的助推器晶格的注入能量的色度成为非零时，单束团阈值电流趋于下降。给出了相应的仿真结果并进行了分析。此外，还研究了能量斜升过程中的横向单束团不稳定性。
The capability of providing full-charge bunches has become an important requirement for quite a few boosters used in ultralow-emittance storage rings based synchrotron light sources. The transverse single-bunch instabilities may limit the single-bunch charge in these type of boosters. The relatively weak synchrotron radiation damping makes the bunch more unstable at the injection energy than at the extraction energy. Therefore, studies of the transverse single-bunch instabilities are carried out first at the injection energy, with the chromaticity varied, to understand how the threshold changes accordingly. Our studies show that the single-bunch threshold current tends to drop when the chromaticity becomes nonzero at the injection energy of the used booster lattice. The corresponding simulation results are presented and analyzed. Furthermore, the transverse single-bunch instabilities during the energy ramping process are also studied.
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