We consider the production of electron cyclotron maser emission by lowdensity, highly magnetized plasmas in relativistic jets. The population inversion required to drive cyclotron maser instability could occur in localized, transient sites where hydromagnetic instabilities, shocks, and/or turbulence lead to magnetic mirroring along current-carrying flux tubes. The maser is pumped by the convers...

We present a new approximation for the frequencies where electron-cyclotron-maser is produced by a loss-cone distribution. This approximation is fully relativistic, and is good also for masering frequencies far from the cyclotron harmonics.

The electron cyclotron maser (ECM) is based on a stimulated cyclotron emission process involving energetic electrons in gyrational motion. It constitutes a cornerstone of relativistic electronics, a discipline that has emerged from our understanding and utilization of relativistic effects for the generation of coherent radiation from free electrons. Over a span of four decades, the ECM has unde...

A two-dimensional, self-consistent, nonlinear model is used to determine the growth rate and saturation level of the cyclotron two-stream instability for two weakly relativistic electron beams co-propagating along a uniform magnetic field with an inverted population in the perpendicular momentum. This instability has been proposed recently as the basis for a double-stream cyclotron maser. Good ...

An analysis of recent free electron laser experiments in combined wiggler and strong axial magnetic fields shows that near resonance, Q,,=kwv,,, the proximity of the cyclotron maser instability precludes an unambiguous identification of the radiation mechanism ( 2,, is the cyclotron frequency in the axial field, kw is the wiggler wavenumber, and v,, the axial electron velocity).

The concept of a cyclotron-resonance maser (CRM) with a ferrite loading incorporated in its waveguide is proposed. The CRM interaction occurs between the rotating electron beam and the em wave propagating along a longitudinally magnetized ferrite medium. The ferrite anisotropic permeability resembles the CRM susceptibility in many aspects, and particularly in their similar response to the axial...

We investigated wave amplification through the Electron-Cyclotron-Masermechanism. We calculated absorption and emission coefficients without any approximations, also taking into account absorption by the ambient thermal plasma. A power-law energy distribution for the fast electrons was used, as is indicated by X-ray and microwave observations. We developed a model for the saturation length and ...