Electron Cloud Effects in Cornell Electron Storage Ring Test Accelerator and International Linear Collider Damping Ring
SCIE
SCOPUS
- Title
- Electron Cloud Effects in Cornell Electron Storage Ring Test Accelerator and International Linear Collider Damping Ring
- Authors
- Jin, HC; Yoon, M; Ohmi, K; Flanagan, JW; Palmer, MA
- Date Issued
- 2011-02
- Publisher
- JAPAN SOC APPLIED PHYSICS
- Abstract
- In this paper, the effects of electron cloud are discussed for the ultra low emittance positron beam in Cornell Electron Storage Ring Test Accelerator (Cesr-TA) and the International Linear Collider (ILC) damping ring. We have investigated the electron-cloud instabilities with Cesr-TA which has been operating to experiment for the ILC damping ring with different positron beam energies: 2 and 5 GeV. The electron phase factor, omega(e),y sigma(z)/c, is given differently to each case. The single-bunch instability is investigated with a simulation based on the strong-strong model by using the simplified lattice. The threshold densities obtained by simulations agree with the predicted values within a factor 1.3. We investigate the effects of the bunch-by-bunch feedback of about 50 turns and non-zero dispersion. The simulation results show that the feedback system suppresses the dipole motion and increases the threshold density in 2 GeV case, but is less effective in 5 GeV case. The threshold densities are degraded with non-zero dispersion in both cases, but the rates of degradation appear differently. We discuss an incoherent emittance growth using the realistic lattice model for Cesr-TA. Below the threshold, the incoherent emittance growth may not be serious in Cesr-TA and the ILC damping ring. (C) 2011 The Japan Society of Applied Physics
- Keywords
- INSTABILITY; BEAM
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/24967
- DOI
- 10.1143/JJAP.50.026401
- ISSN
- 0021-4922
- Article Type
- Article
- Citation
- JAPANESE JOURNAL OF APPLIED PHYSICS, vol. 50, no. 2, page. 26401-1 - 26401-9, 2011-02
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