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APS » Journals » Phys. Rev. Lett. » Volume 97 » Issue 5
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Phys. Rev. Lett. 97, 054801 (2006) [4 pages]

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

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Michel Kireeff Covo1,3, Arthur W. Molvik1, Alex Friedman1, Jean-Luc Vay2, Peter A. Seidl2, Grant Logan2, David Baca2, and Jasmina L. Vujic3
1Heavy-Ion Fusion Science Virtual National Laboratory, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
2Heavy-Ion Fusion Science Virtual National Laboratory, Ernest Orlando Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
3Department of Nuclear Engineering, University of California at Berkeley, 4155 Etcheverry Hall, MC 1730, Berkeley, California 94720, USA

Received 26 May 2006; published 31 July 2006

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.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.97.054801
DOI:
10.1103/PhysRevLett.97.054801
PACS:
29.27.Bd, 29.30.Aj, 34.50.Dy, 41.75.Ak
 
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