Innovations in Applied Physics

Topic and aim. The dynamics of a double-resonator gyroklystron of the 93 GHz band with delayed feedback is studied. A comparative analysis of the dynamical regimes of amplifier generation obtained in the numerical experiment both on the basis of averaged equations and in the framework of direct numerical simulation by the «particle-in-cells» method using the KARAT code is carried out. Method.

The aim of our research is to study the noise in the resistive-wall amplifier with crossed electric and magnetic fields with a beam of finite thickness. The theory of the O-type resistive wall amplifier is well known, at least as a classical example of using of waves with negative energy. Theory of resistive-wall amplifier M-type, in which negative energy waves are also used, has not been studied until recently.

In the present work, a numerical and experimental study of the nonlinear dynamics of spin waves in lateral magnetic microwave guides was made. The mechanism of nonlinear spin-wave coupling between different types of modes in lateral waveguides was revealed. The investigation of lateral magnetic microstructures supporting both linear and nonlinear propagation of spin waves is of great interest nowadays.

At present, the actual task is to study magnetic microstructures, the characteristics of which can be controlled by changing static magnetic and electric fields. Thin films of yttriumiron garnet show much lower damping of spin waves in comparison with metallic magnetic films. The propagation length of spin waves in magnetic microwaveguides and magnonic crystals is of the order of a few millimeters at room temperature.

The development of the terahertz frequency range is one of the priority problems of modern vacuum microwave electronics. For increasing power and efficiency of such devices, it is favorable to use spatially developed slow-wave structures (SWSs) and electron beams with a large cross section. For miniaturization of vacuum-tube devices, reducing of the accelerating voltage becomes a problem of principal importance.

In this paper, brief review of new and early publications devoted to the interaction of electron streams and the enhancement due to the interference of partial waves in streams, and due to instability is adduced.

In this paper we present overview of devices using a dielectric as a slow-wave structure. There are increased focus on consideration of dielectric Cherenkov maser (DCM) and resistive-wall amplifier (RWA). This type of devices may be advance in THz range. The principle of the DCM operation is described by two-dimensional planar model with the indication of main advantages of this device.

In this paper, noise in resistive wall amplifier – vacuum microwave device is studied, in

Resistive wall amplifier is vacuum microwave device. The gain is due to the phase shift between a.c. of electron beam and the alternating field components. The absorbing device walls influence on the alternating field components is considered. It is interesting that there is no need for a slowing system that is important to learn the submillimeter range. Furthermore the feedback is completely absent between the output and the input.

Propagation of nonlinear magnetostatic surface waves through the one-dimensional magnonic crystal based on yttrium-iron garnet film with the defect of periodic array was experimentally studied.