High-power microwave radiation at 8 GHz from a gas-filled backward wave oscillator driven by an intense relativistic electron beam has been measured.  It has been observed that an order of magnitude resonant increase in microwave output power occurs at a particular pressure of the background gas.  This resonance has also been observed to be strongly dependent on the value of applied axial magnetic field.  Possible explanations for the observed results are discussed. 

Focuses on a silicon complementary metal-oxide-semiconductor receiver front-end designed by Behzad Razavi of the Department of Electrical Engineering of the University of California in Los Angeles, California.  Ability of the receiver design to overcome limited speed of transistors; Inclusion of...

We analyzed the possibility of improving the efficiency of microwave devices operating with relativistic electron beams in systems with particle postacceleration in the interaction space.  The fundamental feature of this approach is the formation of the accelerating-potential profile with the...

In this paper, a comprehensive theoretical treatment is developed for backward wave oscillators composed of a relativistic electron beam guided by a strong magnetic field through a slow wave structure consisting of a cylindrical waveguide with a sinusoidally varying wall radius.  This analysis,...

Demonstrates high power microwave generation at 9 gigahertz.  Dimensions of the annular electron beam used; Propagation of beam in a coaxial drift tube; Reduction of the surface fields from existing power sources; Effect of optimizing the interaction length. 

In this article we describe an experimental technique to measure the total electron-impact cross section by measurement of the attenuation of an electron beam passing through a gas at constant pressure with the unwanted forward scattering contribution removed.  The technique is based on the...

A 2.5-dimensional particle-in-cell code was used to simulate different scenarios for the establishment of an electron beam "squeezed state" in a magnetically insulated vircator.  Vircators with and without anode foils were compared.  It was found that the squeezed state is established in both...

Presents a study that investigated the generation of microwave by relativistic electron beam injected in a virtual-cathode reflex triode.  Calculation of the voltage dependencies; Analysis of the variation of the cathode radius; Examination of the separation of reflex and virtual cathode effects.