Tunable fluid-loaded free-electron laser in the low-electron-energy and long-wavelength extreme

R. Drori, E. Jerby*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

A tunable fluid-loaded free-electron laser (FEL) oscillator is demonstrated. This FEL-type experiment employs low-energy electrons, down to 0.4 keV. Therefore, it interacts with extremely long radio waves, in the VHF range [Formula Presented] The device consists of a folded-foil planar wiggler [Formula Presented] and a double-stripline cavity. The variable dielectric loading is implemented by distilled water in glass pipes situated on both sides of the stripline structure. Coherent oscillations are observed at the fundamental cavity mode, around 270 MHz. By varying the fluid dielectric loading, the operating frequency is tuned in a range of 10 MHz. This paper presents (a) the effect of a variable dielectric loading on the FEL tunability in general, and (b) an extremely low-electron-energy and long radiation wavelength, in the lowest end of the known FEL operating spectrum.

Original languageEnglish
Pages (from-to)3588-3593
Number of pages6
JournalPhysical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
Volume59
Issue number3
DOIs
StatePublished - 1999

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