Absolute Measurement of Electron Cloud Density in a Positively-Charged Particle Beam

Journal Article · Thu May 18 00:00:00 EDT 2006 · Physical Review Letters

OSTI ID:900451

Covo, M K; Molvik, A W; Friedman, A; Vay, J; Seidl, P A; Logan, B G; Baca, D; Vujic, J L

Clouds of stray electrons are ubiquitous in particle accelerators and frequently limit the performance of storage rings. Earlier measurements of electron energy distribution and flux to the walls provided only a relative electron cloud density. We have measured electron accumulation using ions expelled by the beam. The ion energy distribution maps the depressed beam potential and gives the dynamic cloud density. Clearing electrode current reveals the static background cloud density, allowing the first absolute measurement of the time-dependent electron cloud density during the beam pulse.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 900451
• Report Number(s): UCRL-JRNL-221485; PRLTAO; TRN: US0702279
• Journal Information: Physical Review Letters, Vol. 97, Issue 5; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
29 ENERGY PLANNING
POLICY AND ECONOMY
70 PLASMA PHYSICS AND FUSION
ACCELERATORS
CLOUDS
ELECTRODES
ELECTRONS
ENERGY SPECTRA
PARTICLE BEAMS
PERFORMANCE
STORAGE RINGS