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Title: Properties of the electron cloud in a high-energy positron and electron storage ring

Journal Article · · Physical Review Special Topics. Accelerators and Beams
 [1];  [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
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Low-energy, background electrons are ubiquitous in high-energy particle accelerators. Under certain conditions, interactions between this electron cloud and the high-energy beam can give rise to numerous effects that can seriously degrade the accelerator performance. These effects range from vacuum degradation to collective beam instabilities and emittance blowup. Although electron-cloud effects were first observed two decades ago in a few proton storage rings, they have in recent years been widely observed and intensely studied in positron and proton rings. Electron-cloud diagnostics developed at the Advanced Photon Source enabled for the first time detailed, direct characterization of the electron-cloud properties in a positron and electron storage ring. From in situ measurements of the electron flux and energy distribution at the vacuum chamber wall, electron-cloud production mechanisms and details of the beam-cloud interaction can be inferred. A significant longitudinal variation of the electron cloud is also observed, due primarily to geometrical details of the vacuum chamber. Furthermore, such experimental data can be used to provide realistic limits on key input parameters in modeling efforts, leading ultimately to greater confidence in predicting electron-cloud effects in future accelerators.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
W-31-109-ENG-38
OSTI ID:
15003703
Journal Information:
Physical Review Special Topics. Accelerators and Beams, Vol. 6, Issue 3; ISSN 1098-4402
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

References (8)

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Head-Tail Instability Caused by Electron Clouds in Positron Storage Rings journal October 2000
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A rudimentary electron energy analyzer for accelerator diagnostics
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journal October 2000
Secondary electron emission yields from PEP-II accelerator materials journal August 2001
Secondary electron emission in the scanning electron microscope journal November 1983
VUV photoemission studies of candidate Large Hadron Collider vacuum chamber materials journal June 1999

Cited By (2)

Effect of the surface processing on the secondary electron yield of Al alloy samples journal May 2013
Effect of the surface processing on the secondary electron yield of Al alloy samples text January 2013

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Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
ADVANCED PHOTON SOURCE
CLOUDS
ELECTRONS
ENERGY SPECTRA
PERFORMANCE
POSITRONS
PRODUCTION
PROTONS
SIMULATION
STORAGE RINGS
advanced photon source