Experimental investigation of beam instabilities in BEPCII

IF 1.5 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment Pub Date : 2024-11-06 DOI:10.1016/j.nima.2024.170036

Jinliu Su , Yudong Liu , Zhi Liu , Di Yin , Huizhou Ma , Yanru Wei , Huiping Geng , Dechong Zhu , Ge Lei , Junhui Yue , Wan Zhang , Chenghui Yu , Cunyang Que

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Abstract

With the high current physical operations of the upgraded Beijing Electron–Positron Collider (BEPCII), thresholds on collision luminosity and beam current have been presented due to various factors such as collision background, noise, equipment stability under high power operation, and so on. One of the most serious influences on beam dynamics was beam instability which has been clearly exhibited. The comprehensive experimental investigation of beam instabilities in BEPCII is an indispensable part of beam physics research and can provide references for the upgrade project of BEPCII. Over the past two years, the experimental investigation of beam instabilities in BEPCII has been carried on with the single and multiple bunch filling in the storage ring. Various impedances, the sources of beam instabilities, including broadband and narrowband impedances in longitudinal and transverse planes are studied. The measured impedance values are compared with the initial design of BEPCII.

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BEPCII 中横梁不稳定性的实验研究

随着升级后的北京正负电子对撞机（BEPCII）的大电流物理运行，由于碰撞背景、噪声、大功率运行下的设备稳定性等各种因素，对撞光度和束流都出现了阈值。对光束动力学影响最大的因素之一是光束的不稳定性，这一点已经得到了清晰的展示。对 BEPCII 的光束不稳定性进行全面的实验研究是光束物理研究不可或缺的一部分，可以为 BEPCII 的升级项目提供参考。近两年来，BEPCII 在存储环中进行了单束和多束填充的束不稳定性实验研究。研究了作为光束不稳定性来源的各种阻抗，包括纵向和横向平面上的宽带和窄带阻抗。测量的阻抗值与 BEPCII 的初始设计进行了比较。

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来源期刊

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment 物理-光谱学

CiteScore

3.20

自引率

21.40%

发文量

787

审稿时长

1 months

期刊介绍： Section A of Nuclear Instruments and Methods in Physics Research publishes papers on design, manufacturing and performance of scientific instruments with an emphasis on large scale facilities. This includes the development of particle accelerators, ion sources, beam transport systems and target arrangements as well as the use of secondary phenomena such as synchrotron radiation and free electron lasers. It also includes all types of instrumentation for the detection and spectrometry of radiations from high energy processes and nuclear decays, as well as instrumentation for experiments at nuclear reactors. Specialized electronics for nuclear and other types of spectrometry as well as computerization of measurements and control systems in this area also find their place in the A section. Theoretical as well as experimental papers are accepted.

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