Electrostatic electron cyclotron waves generated by low-energy electron beams

Saturation of electron cyclotron maser by lower-hybrid waves

We perform a numerical study on the quasilinear relaxation of an electron cyclotron maser on the initially dominant mode. We focus thereby on a situation where the initially dominant modes are quasi-electrostatic lower hybrid (lh) waves, which have not been treated in preceding studies. To this end, we chose 0.2 ≤ ωp/ωBe < 0.5 (ωp: plasma-, ωBe: electron cyclotron frequency) and an initial loss...

Electron Beams in the Low

Selected high resolution spectrograms of solar fast-drift bursts in the 6.2{8.4 GHz range are presented. The bursts have similar characteristics as metric and decimetric type III bursts: rise and decay in a few thermal collision times, total bandwidth > 3% of the center frequency, low polarization , drift rate of the order of the center frequency per second, and are association. They appear in ...

Highly efficient electron vortex beams generated by nanofabricated phase holograms

Collective and Single-Electron Interactions of Electron Beams with Electromagnetic Waves, and Free-Electron Lasers*

The field of radiation emission from electron beams is reviewed with special reference to work related to free-electron lasers. Different schemes o f interaction in periodic structures, electromagnetic slow-wave structures, and in transverse confining force are distinguished. Various effects and devices such as traveling wave amplifiers, Smith-Purcell radiators, Cerenkov and bremsstrahlung-free...

Novel toroidal electrostatic electron energy analyser

The characteristics of a novel, double toroidal, electrostatic electron energy analyser, with input and output optics, have been established. The energy and angular dispersed image on the surface of a microchannel plate detector enables parallel data processing and signifcant gains in efficiency. The characteristics of the toroids and lenses, including time dispersion, have been modelled using ...