Abstract
The electron cloud instability (ECI) in the Beijing Electron Positron Collider (BEPC) was studied systematically with experiments and simulations in recent years. Several electron cloud detectors have been installed into the BEPC storage ring to measure the electron yield. The effects of solenoid, the clearing electrode, the chromaticity, and the octupole on ECI have been investigated in BEPC experimentally. To evaluate the ECI in BEPCII, the upgrade project of BEPC, a computer code has been developed to simulate the electron density in the antechamber under different conditions, as well as the progress of the single bunch and coupled-bunch instabilities caused by the electron cloud. The experimental and simulation results, as well as the activities, are reported in this paper.
Highlights
Since the electron cloud instability (ECI) was first observed on the Beijing Electron Positron Collider (BEPC) in 1996 [1], many experiments have been carried out to study the characteristics of the ECI, the generation of electron cloud (EC), and its effect on the beam performance
A long term study on the beam electron cloud instability has been progressing in BEPC for years, and quite rich study results have been obtained from the experiments and the simulations
We have investigated experimentally the effective ways to suppress ECI, such as solenoid winding, clearing electrode, large chromaticity, octupole, etc
Summary
Since the electron cloud instability (ECI) was first observed on the Beijing Electron Positron Collider (BEPC) in 1996 [1], many experiments have been carried out to study the characteristics of the ECI, the generation of electron cloud (EC), and its effect on the beam performance. BEPC is being upgraded to a two-ring collider, namely, BEPCII, with electron and positron beams circulating in separated rings. The single and coupled-bunch instabilities due to EC are simulated. To get more practical experience for BEPCII, experiments were continued on BEPC in recent years, such as ECI measurement, solenoid effect, and clearing electrodes [a special detector and beam position monitor (BPM) buttons], as well as octupole to cure ECI. The simulation studies about the ECI in BEPCII are introduced sequentially on the EC density and the single and coupled-bunch instabilities. A summary with some discussions on the results is given
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