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On the feedback in the Smith-Purcell experiment

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3 Author(s)
Skrynnik, B.K. ; A. Usikov Inst. of Radiophys. & Electron., Acad. of Sci., Kharkov, Ukraine ; Korneenkov, V.K. ; Demchenko, M.Yu.

Refers to the well understood mm-wave region with a standard accelerating voltage 3-5 kV. The positive feedback is held not on the zeroth but minus first space harmonic of the grating surface wave, i.e. the modulated electron beam is self-excited in BWT mode at λ≈ 11 mm. The high time harmonics of the modulated electron beam are radiated under certain conditions nearly orthogonal to it as fast (volume) waves. Just an experimental verification of the near-millimeter radiation of the fast (volume) waves not from externally modulated but self-excited surface eigenwave mode electron beam is proof that the coherent radiation of light on fast (volume) waves is due to the nonrecognized Smith-Purcell beam automodulation by infrared surface eigenwaves of the planar reflecting grating

Published in:

Physics and Engineering of Millimeter and Sub-Millimeter Waves, 2001. The Fourth International Kharkov Symposium on  (Volume:2 )

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