Ultrashort-pulse prebunched FEL

Gregory P. Le Sage; Scott N. Fochs; Frederic V. Hartemann; David B. McDermott; Neville C. Luhmann Jr.; Michael D. Perry; Jonathan Paul Heritage

doi:10.1117/12.175767

13 May 1994 Ultrashort-pulse prebunched FEL

Gregory P. Le Sage, Scott N. Fochs, Frederic V. Hartemann, David B. McDermott, Neville C. Luhmann Jr., Michael D. Perry, Jonathan Paul Heritage

Author Affiliations +

Proceedings Volume 2154, Intense Microwave Pulses II; (1994) https://doi.org/10.1117/12.175767
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

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.

Citation Download Citation

Gregory P. Le Sage, Scott N. Fochs, Frederic V. Hartemann, David B. McDermott, Neville C. Luhmann Jr., Michael D. Perry, and Jonathan Paul Heritage "Ultrashort-pulse prebunched FEL", Proc. SPIE 2154, Intense Microwave Pulses II, (13 May 1994); https://doi.org/10.1117/12.175767

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