High-Gain 35-GHz Free-Electron Laser-Amplifier Experiment

Abstract

A new intense-beam free-electron laser experiment, operating as a short-pulse amplifier at 35 GHz, has demonstrated linear growth rates of 1.2 dB/cm, total gain of 50 dB, and coherent emission of 17 MW, corresponding to an experimental efficiency of greater than 3%.

Laser-Seeded Free-Electron Lasers at the NSLS

“…After the first FEL amplifier experiment at 10 μm in the 1970s [14], nearly all of the FEL amplifier experiments performed during the last three decades were in the millimeter wavelength regime [15,16]. The SDL laser-seeded FEL amplifier experiment program was initiated to investigate the basic FEL amplification process with a coherent laser seed and to demonstrate efficiency enhancement.…”

High-power microwave plasma pulse compression

“…Note that since we assume no variation of the medium for tt, Vg (t,t )=V (tl,t o ) for t>t 1 . Then the condition that all elements of the " pulse reach the end of the dispersive line at the same time is …”

Gyrotron and ubitron amplifier research at the Naval Research Laboratory

“…Recent studies have focused on the gyro travellingwave tube (GTWT) (Andronov et al 1978, Barnett et al 1979) and the gyro-klystron (Jory et al 1977) as specific embodiments of the ECR M and the ubitron (Phillips 1963, Parker et al 1982, Gold et al 1984 as an FEM. These devices bypass the need for a conventional slow-wave circuit by using the undulatory or periodic motion of the electrons, induced by external fields applied in the interaction region, to couple (synchronize) a natural beam resonance to a selected waveguide mode.…”