Observation of coherent Smith-Purcell radiation using an initially continuous flat beam

Open Access

Observation of coherent Smith-Purcell radiation using an initially continuous flat beam

J. Gardelle, L. Courtois, P. Modin, and J. T. Donohue

Phys. Rev. ST Accel. Beams 12, 110701 – Published 9 November 2009

Abstract

A few years ago a new theory for producing coherent Smith-Purcell (SP) radiation from an initially continuous beam was proposed. This experiment confirms that two-dimensional theory. The beam was typically 10 cm wide, a few mm thick, with a peak current of 200 A and beam energy of 85 keV. The 10 cm-wide grating had twenty 2-cm periods, and radiation was produced at the fundamental frequency near 4.5 GHz. Second and third harmonics were observed at the expected angles. Beam bunching was measured using a B-dot probe placed at the end of a groove. Generally good agreement between this experiment and the 2D theory is found.

Received 15 April 2009

DOI:https://doi.org/10.1103/PhysRevSTAB.12.110701

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