Abstract

The dispersion relations of electromagnetic surface waves in a magnetized relativistic beam propagating in a cylindrical column surrounded by vacuum have been recently derived by Lee, 2024, using relativistic fluid equations. We would like to draw attention to an important body of work to study the problem of electromagnetic surface waves propagating at the surface of a relativistic beam, both in a cylindrical column and in cartesian geometry, and both in the absence and in the presence of an external magnetic field of arbitrary intensity.

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