Experimental investigation of structure, spectral and energy characteristics of intense multiple-velocity electron beams

Summary form only given. In microwave electronics devices a laminar (or close to them) intensive electron beams are using basically. Recently, however, due to the design and development of microwave generators of broadband noise-like oscillations¹ (including chaotic) the non-laminar (turbulent) electron beams and the study of their structure and properties are worthy of attention. Such turbulent electron beams are usually multi-speed and allow to form a dense space charge bunches in different transverse planes. Such dense space charge bunches are strongly unstable and perform intensive spatio-temporal fluctuations. These spatio-temporary fluctuations are the sources of broadband noise microwave radiation of low and medium power². In this paper we consider the results of experimental studies of spectral and energy characteristics of space charge bunches in intense nonlaminar (turbulent) electron beams. It is shown that the presence of spread of electron velocities in the drift space is the cause of the formation of internal distributed electronic feedback. These internal distributed electronic feedback is a necessary condition for the existence of generation. Impact of an inhomogeneous magnetic field, the decelerating electric field on the multispeed electron beams leads to increasing the turbulence in multispeed electron beams.