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Proceedings Paper

Ultrashort-pulse prebunched FEL
Author(s): Gregory P. Le Sage; Scott N. Fochs; Frederic V. Hartemann; David B. McDermott; Neville C. Luhmann; Michael D. Perry; Jonathan Paul Heritage
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Paper Abstract

Currently under design is an X-band photocathode linac FEL system which produces ultra- short (picosecond), high-power (MW) pulses of coherent microwave and millimeter-wave radiation. In this system, the resultant electron bunches are considerably shorter than the wavelength of the emitted radiation, and these bunches coherently emit synchrotron radiation in the wiggler interaction region to generate subnanosecond, millimeter-wave MW pulses. The output radiation pulse length is essentially determined by the slippage between the electron bunch and the electromagnetic waves through the wiggler. The wiggler, which has already been constructed and characterized, produces a 5 kG helically polarized field, with an 84 mm period over a length of 2 meters. The device operates in the fundamental TE11 cylindrical waveguide mode. Close to grazing, where slippage is minimal, the pulses are further compressed because of the very wide instantaneous interaction bandwidth. In this regime, the output pulse duration is determined by the group velocity dispersion in the waveguide and the interaction bandwidth. A planned upgrade for the system is also described.

Paper Details

Date Published: 13 May 1994
PDF: 12 pages
Proc. SPIE 2154, Intense Microwave Pulses II, (13 May 1994); doi: 10.1117/12.175767
Show Author Affiliations
Gregory P. Le Sage, Univ. of California/Los Angeles (United States)
Scott N. Fochs, Univ. of California/Los Angeles (United States)
Frederic V. Hartemann, Univ. of California/Davis (United States)
David B. McDermott, Univ. of California/Davis (United States)
Neville C. Luhmann, Univ. of California/Davis (United States)
Michael D. Perry, Lawrence Livermore National Lab. (United States)
Jonathan Paul Heritage, Univ. of California/Davis (United States)

Published in SPIE Proceedings Vol. 2154:
Intense Microwave Pulses II
Howard E. Brandt, Editor(s)

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