Emittance growth of a short electron bunch in circular motion Page: 4 of 20
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1
Emittance Growth of a Short Electron Bunch
in Circular Motion*
Bruce E. Carlsten and John C. Goldstein
Los Alamos National Laboratory, Los Alamos, NM 87545, USA
Abstract
A short electron bunch undergoing circular motion produces space-charge forces that do
not decrease with increasing bunch energy, unlike those induced by straight-line motion. These
energy-independent forces can be separated into a noninertial space-charge force and a coherent
synchrotron radiation force. These forces result in an energy spread in the bunch, and can lead to a
potentially large emittance growth. These effects can take place in both (1) bunch compression
systems used to increase the peak current and (2) the wiggler itself. Numerical estimates of the
emittance growth in a wiggler for a 1-ps long, 1-mm radius, 1-nC electron bunch can be as large as
0.1 n mm mrad per wiggle period; the energy spread can grow as much as 30 keV per wiggle
period. These types of beam quality degradation may become significant for future, short-
wavelength free-electron lasers requiring high-brightness electron beams, especially for self-
amplified spontaneous emission operation.
* This work was supported by the Los Alamos Laboratory Directed Research and Development
program, under the auspices of the U. S. Department of Energy
1 Corresponding author. Tel. +1 505 667 5657, fax +1 505 667 8207, e-mail bcarlsten@lanl.gov.
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Carlsten, B. E. & Goldstein, J. C. Emittance growth of a short electron bunch in circular motion, article, September 1996; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc681741/m1/4/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.