论文标题
通过高频同步器运动通过束束式溢出的溢出纹波缓解
Spill ripple mitigation by bunched beam extraction with high frequency synchrotron motion
论文作者
论文摘要
由于加速器磁体的波纹在提取的梁上的波纹引起的波小结构的形成缓慢，用于缓解微型结构的形成，这也称为溢出。这尤其有助于使用缓慢的检测器或较低的提取速率进行实验。此外，该技术被广泛用于避免在电离室中测得的溢出物中的长间隙，这又会触发互锁。 另一方面，束在RF频率定义的时间尺度上创建溢出结构。此外，持续时间的宏观溢出结构可通过同步加速器运动可以产生足够大的同步加速器调子而产生。 该报告的目的是研究由RF电压的振幅和谐波数确定的同步加速器调子的影响，这还取决于循环束的横向发射率和纵向束区域以及颗粒过境时间的分布。
Slow extraction of bunched beams is widely used for mitigating the formation of micro structures due to ripples of the accelerator magnets power supplies on the extracted beam which is also referred to as spill. That helps, in particular, experiments with slow detectors or with low extraction rates. Furthermore, this technique is widely used for avoiding long gaps in the spill measured in ionisation chambers which in turn would trigger interlocks. On the other hand, the bunches create spill structures on time scales defined by the rf frequency. In addition, macroscopic spill structures of duration up to some hundred milliseconds can be created by the synchrotron motion for a sufficiently large synchrotron tune. The aim of this report is to study the influence of the synchrotron tune determined by amplitude and harmonic number of the rf voltage which additionally depends on the transverse emittance and the longitudinal bunch area of the circulating beam as well as the distribution of the particles' transit times.
