Design and optimization of a longitudinal feedback kicker cavity for the HLS-Ⅱ storage ring

• Published in: Chinese physics C 2013-03, Vol.37 (3), p.84-92
• Main Author: 徐卫 W.Z.Wu 何多慧 Y.K.Wu
• Format: Article
• Language: English
• Subjects: Beams (radiation); Design engineering; Feedback; HLS储存环; Holes; Instability; Light sources; Optimization; Stability; Storage rings (particle accelerators); 不稳定性; 优化技术; 反馈系统; 合肥光源; 朗道阻尼; 腔体; 设计
• ISSN: 1674-1137; 0254-3052
• DOI: 10.1088/1674-1137/37/3/037003

In the Hefei Light Source （HLS） storage ring, multibunch operation is used to obtain a high luminosity. Multibunch instabilities can severely limit light source performance with a variety of negative impacts, including beam loss, low injection efficiency, and overall degradation of the beam quality. Instabilities of a multibunch beam can be mitigated using certain techniques including increasing natural damping （operating at a higher energy）, lowering the beam current, and increasing Landau damping. However, these methods are not adequate to stabilize a multibunch electron beam at a low energy and with a high current. In order to combat beam instabilities in the HLS storage ring, active feedback systems including a longitudinal feedback system （LFB） and a transverse feedback system （TFB） will be developed as part of the HLS upgrade project, the HLS-Ⅱ storage ring project. As a key component of the longitudinal bunch-by-bunch feedback system, an LFB kicker cavity with a wide bandwidth and high shunt impedance is required. In this paper we report our work on the design of the LFB kicker cavity for the HLS-Ⅱ storage ring and present the new tuning and optimization techniques developed in designing this high performance LFB kicker.