Publicou 12 edições por ano
ISSN Imprimir: 0040-2508
ISSN On-line: 1943-6009
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On the Feedback in Smith-Purcell Experiments
RESUMO
Excitation of fast (bulk) waves 0.9 and 3.6 mm band and at angles close to 90° from an electron beam which is not modulated by an external signal has been experimentally detected. The above experiments were similar to those of Smith-Purcell, but they were made over the millimeter wavelength range and at an accelerating voltage from 2.5 to 5.2 kV. The minus first space harmonic of a slow (surface) wave of the periodic structure excited in the wavelength range from 11 to 0.5 mm in the BWT regime has been used for the self-modulation of the electron beam.
Analysis of the known conditions has been performed notably the excitation of fast and slow waves, modulation of an electron beam by a slow wave, both spatial and time retardation of the higher-order harmonics of an electron beam. The results have been verified experimentally.
It is stated that a principally unavoidable positive feedback via a slow wave of a plane grating has been used to obtain the electron beam modulation in the Smith-Purcell experiments as in the case of this particular experiment.
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Jarvis J. D., Andrews H. L., Brau C. A., Small-signal theory of a grating-based free-electron laser in three dimensions, Physical Review Special Topics - Accelerators and Beams, 13, 2, 2010. Crossref
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Gardelle J., Donohue J. T., Three-Dimensional Simulations of Coherent Smith–Purcell Radiation Using a Particle-in-Cell Code, IEEE Transactions on Electron Devices, 56, 5, 2009. Crossref
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Cao Miaomiao, Liu Wenxin, Wang Yong, Li Ke, Enhance the terahertz Smith-Purcell superradiant radiation by using dielectric loaded grating, Physics of Plasmas, 22, 8, 2015. Crossref
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Gardelle Jacques, Modin Patrick, Donohue John T., Radiation at 100 and 200 GHz From a Compact Planar Smith–Purcell Free-Electron Laser, IEEE Transactions on Terahertz Science and Technology, 7, 2, 2017. Crossref