Other
Scientific paper
Feb 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phrvl..94e4803k&link_type=abstract
Physical Review Letters, vol. 94, Issue 5, id. 054803
Other
49
Radiation By Moving Charges, Infrared, Submillimeter Wave, Microwave, And Radiowave Sources, Beam Characteristics, Optical Measurements
Scientific paper
We report the observation of enhanced coherent Smith-Purcell radiation (SPR) at terahertz (THz) frequencies from a train of picosecond bunches of 15 MeV electrons passing above a grating. SPR is more intense than other sources, such as transition radiation, by a factor of Ng, the number of grating periods. For electron bunches that are short compared with the radiation wavelength, coherent emission occurs, enhanced by a factor of Ne, the number of electrons in the bunch. The electron beam consists of a train of Nb bunches, giving an energy density spectrum restricted to harmonics of the 17 GHz bunch train frequency, with an increased energy density at these frequencies by a factor of Nb. We report the first observation of SPR displaying all three of these enhancements, NgNeNb. This powerful SPR THz radiation can be detected with a high signal to noise ratio by a heterodyne receiver.
Kesar A. S.
Korbly S. E.
Sirigiri J. R.
Temkin Richard J.
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