M. B. Goykhman

Measurement of high-power microwave pulses by resistive hot-electron sensors

Use of hot-electron semiconductor detectors for the measurement of high-power microwave pulses may lead to anomalously large errors. Methods of separation of the error signal and determination of the measurement error are considered.

Low-impedance relativistic backward wave oscillator

It is shown that the limiting electron-beam current in a relativistic backward wave oscillator (BWO) can be increased using a slow-wave system (SWS) in the form of a circular waveguide with shallow rectangular corrugation. This idea was checked both experimentally and numerically for a 3-cm BWO with a short homogeneously corrugated SWS and a resonance reflector-modulator. The experiments showed that the proposed BWO with an explosion-emission electron gun and said SWS can effectively operate on 60-Ohm electron beams at a gigawatt output power.

Relativistic backward wave oscillator with multijet electron beam

The influence of the multijet structure of an annular electron beam on the operation of a high-current relativistic backward wave oscillator (BWO) has been experimentally studied. Multijet annular electron beams were generated using graphite explosive-emission cathodes shaped as tubes with comb-shaped ridges. It is established that the BWO working characteristics are highly stable with respect to the multijet beam structure. Potential possibilities of using multijet electron beams in BWOs are pointed out.

A high-power relativistic backward wave oscillator with a longitudinal slot slow-wave system

It is established that longitudinal slots in the slow-wave system of a high-current relativistic backward wave oscillator (BWO) can be used as additional means of mode selection and effective absorption of near-wall plasma. Using these properties, it is possible to increase the limiting pulse duration and repetition rate of BWO output radiation pulses.

Relativistic backward-wave tube with a smooth control over output radiation pulse duration

The effect of failure of oscillations in a low-impedance backward-wave tube is described and the possibility of using this effect for controlling the duration of output radiation pulses is considered.

Relativistic BWO with Short Interaction Space

Summary form only given. The results of experimental investigations of two high power relativistic BWOs with short electrodynamic systems and input reflectors that convert an operating wave to a wave extracting radiation from the interaction space, and modulate the electron beam are presented. A variation of the quasi-static potential of the electron beam takes place in the section with deep corrugation of the waveguide wall. This variation significantly alters phase relations and the magnitude of coupling between interacting waves. In the experiments amplitude and phase relations are chosen by varying the length of the drift channel between the reflector and the interaction space and by applying resonant modulators. We have used a system of coupled cavities or a Bragg reflector as a resonant modulator. We also demonstrate that these gigawatt BWO-oscillators can work at high repetition rate and with low impedance (down to 50 Omega) electron beams.

Influence of dispersion on Rogowski loop operation in the short-pulse regime

Basic effects and conditions limiting application of the Rogowski loop in ultrashort current pulse measurements are considered. A technique for partial reconstruction of the current pulse shape is suggested that substantially extends the potential of related sensors.