Observation of Magnetic Resonances in Electron Clouds in a Positron Storage Ring Page: 1 of 15
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Observation of Magnetic Resonances in
Electron Clouds in a Positron Storage Ring *
M. T. F. Pivi, * J. S. T. Ng, * F. Cooper, D. Kharakh, F. King,
R. E. Kirby, B. Kuekan, C. M. Spencer, T. O. Raubenheimer,
and L. F. Wang
SLAC National Accelerator Laboratory, Menlo Park, CA 94025.
The first experimental observation of magnetic resonances in electron clouds is
reported. The resonance was observed as a modulation in cloud intensity for un-
coated as well as TiN-coated aluminum surfaces in the positron storage ring of the
PEP-II collider at SLAC. Electron clouds frequently arise in accelerators of posi-
tively charged particles, and severely impact the machines' performance. The TiN
coating was found to be an effective remedy, reducing the cloud intensity by three
orders of magnitude.
Key words: Electron cloud instability, secondary emission, positron storage rings,
PA CS: 29.27.Bd, 29.20.db, 79.20.Hx, 52.20.Dq
In the vacuum chamber of particle storage rings or accelerators, the formation
of electron clouds may be initiated by photoelectrons released from surfaces
and ionized residual gas molecules. The cloud density increases when elec-
trons accelerated by the beam field impinge on the chamber wall and cause
surface secondary emissions. Electron clouds, at sufficiently high density, can
* Work supported by the US Department of Energy, Contract DE-AC03-
* Corresponding authors: email@example.com, firstname.lastname@example.org.
Preprint submitted to Nucl. Instr. and Methods A
12 April 2010
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Pivi, M.T.F.; Ng, J.S.T.; Cooper, F.; Kharakh, D.; King, F.; Kirby, R.E. et al. Observation of Magnetic Resonances in Electron Clouds in a Positron Storage Ring, article, August 24, 2011; United States. (digital.library.unt.edu/ark:/67531/metadc931780/m1/1/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.