Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprk16008b&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
An electron beam traveling perpendicular to the groves of a metallic grating produces radiation with a wavelength depending on the beam velocity and the observation angle. Named the Smith-Purcell effect after its discoverers, this process is the basis of a compact THz free electron laser (SP-FEL). Currently, a modified scanning electron microscope serves as an electron beam source and provides precise control of the operating parameters. Superradiant emission in this device was achieved in 1997. The output power just below threshold oscillates with beam current, exhibiting distinct features attributable to the beating of three co-propagating waves, as predicted by the Pierce theory for traveling-wave tubes. Observation of this behavior confirms the gain mechanism underlying the SP-FEL.
Bakhtyari Arash
Brownell James Hayden
Walsh John E.
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