Share Email Print

Proceedings Paper

Photoinjector-driven chirped-pulse free-electron maser
Author(s): Frederic V. Hartemann; Gregory P. Le Sage; Scott N. Fochs; Helena X.C. Feng; L. L. Laurent; S. A. Rosenau; Neville C. Luhmann
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

A compact, high repetition rate (2.142 GHz in burst mode), relativistic (5 MeV) photoinjector facility is currently under construction at the UC Davis Department of Applied Science, on the LLNL site. Photoelectron bunches are produced by irradiating a high quantum efficiency Cs2Te photocathode with a train of 100 UV (210 nm), ultrashort (250 fs) laser pulses. These bunches are accelerated in a 1-1/2 cell, (pi) -mode, X-band rf structure energized by a 20 MW, 8.568 GHz SLAC klystron. The peak current is 0.25 kA (0.25 nC, 1 ps bunches), with a normalized emittance (epsilon) < 2.5 (pi) mm-mrad. This prebunched electron beam is then transversally accelerated in a cylindrical waveguide by a 30-mm period, 10 period long helical wiggler. The peak wiggler field is adjusted to 8.5 kG, so that the group velocity of the radiated electromagnetic waves matches the axial velocity of the electron bunch (grazing condition). Chirped pulses in excess of 2 MW power are produced with an instantaneous bandwidth extending from 125 GHz to 225 GHz, and pulse duration of 15 ps.

Paper Details

Date Published: 8 September 1995
PDF: 6 pages
Proc. SPIE 2557, Intense Microwave Pulses III, (8 September 1995); doi: 10.1117/12.218558
Show Author Affiliations
Frederic V. Hartemann, Univ. of California/Davis (United States)
Gregory P. Le Sage, Univ. of California/Davis (United States)
Scott N. Fochs, Univ. of California/Davis (United States)
Helena X.C. Feng, Univ. of California/Davis (United States)
L. L. Laurent, Univ. of California/Davis (United States)
S. A. Rosenau, Univ. of California/Davis (United States)
Neville C. Luhmann, Univ. of California/Davis (United States)

Published in SPIE Proceedings Vol. 2557:
Intense Microwave Pulses III
Howard E. Brandt, Editor(s)

© SPIE. Terms of Use
Back to Top