Direct Observation of a Semi-Bare Electron Coulomb Field Recover

TL;DR

This paper reports the first direct experimental observation of a semi-bare electron Coulomb field recovering after passing through a hole in a conductive screen, confirming theoretical predictions and demonstrating field recovery with forward radiation.

Contribution

It provides the first direct measurement of semi-bare electron Coulomb field recovery in a macroscopic setup, validating theoretical models.

Findings

Observed the spatial distribution of the electron's Coulomb field recovering.

Detected forward radiation associated with the field recovery process.

Confirmed theoretical predictions of semi-bare electron behavior.

Abstract

The problem of "semi-bare electron" was first considered in frame of quantum electrodynamics by E.L. Feinberg in 1980. In theory in frame of classical electrodynamics this problem was touched on in articles of N.F. Shul'ga and X. Artru. In 2008 the experimental investigations of this phenomenon in millimeter wavelength region were started by the group of scientists, including authors of this article. Used technique allowed us to study this effect in macroscopic mode. In this paper we present the results of direct observation of a semi-bare electron coulomb field recovery. The semi-bare state was obtained by passing of electron beam through the hole in a conductive screen. Measured spatial distribution of electromagnetic field shows the process of recover of the electron coulomb field, which is followed by a forward radiation. The experiments were performed on the relativistic electron beam of the microtron of Tomsk Polytechnic University.