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Phys. Rev. Lett. 88, 154801 (2002) [4 pages]

Transverse Envelope Dynamics of a 28.5-GeV Electron Beam in a Long Plasma

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C. E. Clayton, B. E. Blue, E. S. Dodd, C. Joshi, K. A. Marsh, W. B. Mori, and S. Wang
University of California, Los Angeles, California 90095

P. Catravas, S. Chattopadhyay, E. Esarey, and W. P. Leemans
Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720

R. Assmann*, F. J. Decker, M. J. Hogan, R. Iverson, P. Raimondi, R. H. Siemann, and D. Walz
Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309

T. Katsouleas, S. Lee, and P. Muggli†
University of Southern California, Los Angeles, California 90089

Received 9 October 2001; published 2 April 2002

The transverse dynamics of a 28.5-GeV electron beam propagating in a 1.4 m long, (0–2)×1014 cm-3 plasma are studied experimentally in the underdense or blowout regime. The transverse component of the wake field excited by the short electron bunch focuses the bunch, which experiences multiple betatron oscillations as the plasma density is increased. The spot-size variations are observed using optical transition radiation and Cherenkov radiation. In this regime, the behavior of the spot size as a function of the plasma density is well described by a simple beam-envelope model. Dynamic changes of the beam envelope are observed by time resolving the Cherenkov light.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.154801
DOI:
10.1103/PhysRevLett.88.154801
PACS:
52.40.Mj, 29.27.-a, 41.75.Lx, 41.85.-p

*Present address: CERN, Geneva, Switzerland.

†Corresponding author.Electronic address: muggli@usc.edu

 
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