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VOLUME 105 | ISSUE 9 | PAGE 531
First experimental observation of conical effect in Smith-Purcell radiation
The conical effect in Smith-Purcell radiation arising from electrons moving at non-zero angle ψ to the direction of grating periodicity has been observed for the first time. It was found that the maximum of radiation intensity for \psi\neq0 shifts in both polar and azimuthal angles. The experimental and theoretical results were compared, and the good agreement was shown. The experiment has been performed for 6 MeV electrons and at millimeter wavelengths