Abstract
A free-electron-laser (FEL)-type interaction is observed between a low-energy electron beam (∼0.7 keV) and a radio wave in the VHF range (λ = 1.1 m). The experimental device consists of a transmission-line (TEM-mode) cavity, and a folded-foil planar wiggler (λw = 4 cm). Coherent oscillations are observed in the fundamental-cavity mode (0.28GHz) and in higher-order modes. The FEL-type mechanism is demonstrated here in a new regime, λ ≫ λw.
Original language | English |
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Pages (from-to) | 284-288 |
Number of pages | 5 |
Journal | Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment |
Volume | 393 |
Issue number | 1-3 |
DOIs | |
State | Published - 1 Jul 1997 |
Keywords
- Free-electron laser
- Free-electron maser
- Radio waves
- UHF
- VHF