Peculiarities of electromagnetic field oscillations of a charged particle rotating about a conductive ball

Abstract

Abstract. The paper investigates some characteristic features of the electromagnetic field of a relativistic charged particle that uniformly rotates about a conductive ball in its equatorial plane. It is assumed that the braking of the particle due to radiation is compensated by an external influence (e.g. the electric force) that compels the particle to turn uniformly in a circle. The magnetic permittivity of the ball is assumed to be one. The work is based on the corresponding exact analytic solutions of Maxwell’s equations. The generalized Drude-Lorentz-Sommerfeld formula for the dielectric function of the conductive ball is used in numerical calculations. It is shown that localized oscillations of a high-amplitude electromagnetic field can be generated at a given harmonic inside the ball at a certain (resonant) particle rotation frequency at a small distance from the surface of the ball. Herewith, at large distances from the trajectory of the particle, these localized oscillations are accompanied by intense radiation at the same harmonic, which is many times more intense than the analogous radiation in the case when the ball is absent. The possibilities of using this phenomenon to develop sources of quasi-monochromatic electromagnetic radiation in the range from giga- to terra hertz frequencies are discussed.

On investigations of radiation processes in media under external influences conducted at the IAPP

“…In [59][60][61][62][63][64][65][66][67][68][69][70][71][72][73] the radiation of relativistic charged particles/bunches moving along various trajectories in layered media with spherical symmetry is investigated. In [59,60] the Green function of the electromagnetic field for a medium with spherically-symmetric layers, and formulas for spectralangular distribution of radiation intensity is derived.…”

“…In [59,60] the Green function of the electromagnetic field for a medium with spherically-symmetric layers, and formulas for spectralangular distribution of radiation intensity is derived. In [61][62][63][64][65][66][67][68][69][70][71][72][73] it is shown, that the influence of spherical boundaries on radiation processes can be essential and has a resonant nature. Below we briefly discuss some of the results of those works.…”

“…Resonant influence of conductive ball on the radiation from a uniformly moving or rotating charged particle [69,70] In [70] the features of the electromagnetic radiation generated by a charged particle rotating around a conductive ball is studied. The generalized Drude-Lorentz-Sommerfeld formula is used for the dielectric function of the conductive ball.…”

“…emitted by the electron at the first harmonic during one period of its rotation about the conductive ball. For explanations see [70].…”