Nuclear Science and Techniques ›› 2019, Vol. 42 ›› Issue (3): 30401-030401.doi: 10.11889/j.0253-3219.2019.hjs.42.030401

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Research of the double feedback system operating in BEPCII

Qinghong LAN1,2,Di YIN1,Junhui YUE1,2(),Huizhou MA1,Jun HE1(),Jingxia ZHAO1   

  1. 1. CAO Jianshe1, 2 SUI Yanfeng1, 2
    2. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • Received:2018-12-03 Revised:2019-02-19 Online:2019-03-10 Published:2019-03-14
  • Contact: Junhui YUE,Jun HE E-mail:yuejh@ihep.ac.cn
  • About author:<named-content content-type="corresp-name">LAN Qinghong</named-content>, female, born in 1992, graduated from Wuhan University in 2015, master student, major in electronics and communication engineering, focusing on accelerator beam measurement technology research|<named-content content-type="corresp-name">LAN Qinghong</named-content>, female, born in 1992, graduated from Wuhan University in 2015, master student, major in electronics and communication engineering, focusing on accelerator beam measurement technology research|YUE Junhui, E-mail:<email>yuejh@ihep.ac.cn</email>|YUE Junhui, E-mail:<email>yuejh@ihep.ac.cn</email>
  • Supported by:
    Supported by National Natural Science Foundation of China(No.11475204);Supported by National Natural Science Foundation of China (No.11475204)

Abstract: Background

Digital bunch-by-bunch feedback control is the best way to control bunch instability. It will be applied to the super collider to suppress the beam oscillation within a dozen or even several cycles. The damping time of circular electron positron collider (CEPC) and FCC-ee ( Future Circle Collider e-e+ ) is very short, but it is impossible to realize through using traditional digital feedback system.

Purpose

This study aims to cure the coupled-bunch instability by using a dual-feedback control system to reduce the damping time for BEPCII (Beijing Electron Positron Collider II).

Methods

Several feedback systems operate simultaneously and act on the same time beam in storage ring can superimpose the damping effect and then reduce the damping time of the system. With the favorable condition of two stripline kicker located on the outer ring, we make a experimental research about double feedback system in BEPCII synchrotron mode. Among the double feedback system, one system is the self-make digital bunch-by-bunch transverse feedback system based commercial card, the other system is the commercial feedback system produced by the Dimtel company.

Results

The damping time of commercial feedback system is measured as 0.93 ms, the damping time of self-make digital bunch-by-bunch transverse feedback system based commercial card is measured as 2.98 ms, and the damping time of double feedback system is measured as 0.70 ms.

Conclusions

Several feedback systems work simultaneously can effectively reduce the damping time turn by turn.

Key words: Double feedback system, Damping time, Beam oscillation, Linear fitting

CLC Number: 

  • TL506