Experimental study of the microwave emission from electrons in air
Abstract
We searched for the emission of microwave radiation in the Ku band generated by a 95 keV electron beam in air. We unequivocally detected the radiation, and measured its yield and angular dependence. Both the emitted power and its angular pattern are well described by a model, where microwave photons are generated via bremsstrahlung in the free-electron atomic-nucleus collisions, during the slowdown of the electrons. As a consequence, the radiation is not isotropic but peaked in the forward direction. The emission yield scales proportionally with the number of electrons. This contrasts a previous claim that the yield scales with the number squared, due to coherence. With a Monte Carlo simulation we extrapolate our results to the Ultra High Energy Cosmic Ray energy range.
Keywords
Cite
@article{arxiv.1408.5886,
title = {Experimental study of the microwave emission from electrons in air},
author = {E. Conti and G. Collazuol and G. Sartori},
journal= {arXiv preprint arXiv:1408.5886},
year = {2014}
}
Comments
5 pages, 4 figures. Accepted for publication in Phys.Rev.D