Longitudinal emittance measurement for an external-bunching-based heavy-ion RFQ

Longitudinal emittance measurement for an external-bunching-based heavy-ion RFQ
复制标题

DOI：
10.1016/j.nima.2022.166457
复制
发表时间：
2022-02
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：
Yao Yang;Y. Zhai;Ruixia Tian;X. Jin;Xianwu Wang;L. Jing;Xianbo Xu;Y. Zhai;Yuran Tang;Bo Zhang-;Libing Li;Liepeng Sun;Yu-hui Guo;Peng Zhang;Liangting Sun;Hongwei Zhao
Yao Yang;Y. Zhai;Ruixia Tian;X. Jin;Xianwu Wang;L. Jing;Xianbo Xu;Y. Zhai;Yuran Tang;Bo Zhang-;Libing Li;Liepeng Sun;Yu-hui Guo;Peng Zhang;Liangting Sun;Hongwei Zhao
中科院分区：
其他
文献类型：
--
作者：
Yao Yang;Y. Zhai;Ruixia Tian;X. Jin;Xianwu Wang;L. Jing;Xianbo Xu;Y. Zhai;Yuran Tang;Bo Zhang-;Libing Li;Liepeng Sun;Yu-hui Guo;Peng Zhang;Liangting Sun;Hongwei Zhao

文献摘要

相似文献

纵向发射度是决定后续直线加速器中粒子损失的重要参数。为了了解基于外部聚束的重离子加速器输出束流的质量，并为强流重离子加速器（HIAF）超导直线加速器提供关键信息，在中国科学院近代物理研究所（IMP）的HIAF前端样机上测量了纵向发射度。一个81.25 MHz的四分之一波谐振器（QWR）的再聚束器的开发和安装在后面的微波。再聚束器的电压扫描和相应的聚束长度测量确定纵向发射度。测量是针对预聚束器的不同操作条件实施的，预聚束器安装在预聚束器的上游，并且是以两个频率操作的多谐波聚束器（MHB）。不同的预聚束变体测量的纵向发射度趋势遵循从模拟中预期的那些，但系统地低于估计。模拟和测量都预测了一个相对较低的发射度，而MHB工作在100kHz的基频。本研究对这一现象的原因进行了探讨。
Longitudinal emittance at the RFQ output is a very important parameter to determine the particle loss in the subsequent linac. To understand the quality of beams delivered by an external-bunching-based heavy-ion RFQ and to provide key information for High Intensity heavy ion Accelerator Facility (HIAF) superconducting linac, longitudinal emittance was measured at the protype of HIAF front-end at Institute of Modern Physics (IMP). An 81.25 MHz quarter wave resonator (QWR) re-buncher was developed and installed behind the RFQ. A voltage scan of the re-buncher and the corresponding bunch length measurement determine the longitudinal emittance. The measurements were implemented for different operation conditions of the pre-buncher which is installed upstream of the RFQ and is a Multi-Harmonic-Buncher (MHB) operating with two frequencies. Measured longitudinal emittance trends for different pre-bunching variants follow those expected from simulation but are systematically lower than estimated. Both simulation and measurement predict a relatively lower emittance while the MHB operating with the RFQ fundamental frequency. The reason has been discussed in this study.