The results of numerical three-dimensional PIC simulations self-consistent dynamics off-axis charged particles under the influence excited wake field in a three-zone rectangular dielectric-plasma accelerating structure are presented, which showed possibility simultaneous acceleration test electron bunch and its focusing, that made it possible to transport bunches. In vacuum structure, focusing is completely absent, but stable over finite length also possible, although somewhat smaller range...

The paper presents the results of numerical PIC-simulation accelerated (test) and drive bunches dynamics in a dielectric waveguide THz frequency range filled with radially inhomogeneous plasma. wakefield was excited by azimuthally-symmetric on-axis electron bunch quartz tube embedded metal waveguide. A radial displacement test is absent too. At simulations plasma, we used different transverse density profiles, viz., profile formed capillary discharge, nonuniform vacuum channel along axis....

Abstract The paper presents the results of numerical particle-in-cell simulation positron bunch focusing during acceleration in a plasma dielectric wakefield accelerator. is excited by drive electron quartz tube, embedded cylindrical metal waveguide. internal area tube filled with having general case paraxial vacuum channel. Two different models density radius-relationship are investigated: homogeneous model and inhomogeneous dependence characterized capillary discharge. Results show that...

To mitigate the BBU instability and improve characteristics of accelerated bunches in Dielectric Wakefield Accelerator one can be used isotropic plasma filling transport channel. Here we present results analytical numerical studies dynamics electron/positron drive electron under wake acceleration a DWA (PDWA) with vacuum The field is excited by an bunch quartz dielectric tube inserted into cylindrical metal waveguide. inner region filled channel along waveguide axis. At simulations energy...

The main results of theoretical and experimental researches concerning the physical processes in a dielectric wakefield accelerator based on accelerating excitation structure with use long sequence electron bunches are presented. enhancement excited amplitude is achieved owing to coherent summation wakefields generated by separate bunches. accelerated total arbitrarily dividing bunch into exciting parts, using appropriate frequency detuning repetition respect principal transverse mode....

In leading laboratories of the world intensive research on powerful microwave generators with magnetic self-isolation (MILO) is being carried out. present work results calculation and theoretical analysis MILO, designed tested in Institute Electromagnetic Research (IEMR), are given.

A theoretical and experimental study of wakefield excitation by a profiled sequence relativistic electron bunches in the plasma-dielectric structure, parameters which provide conditions for small decelerating field all driver with simultaneous growth number accelerating total was carried out. Theoretically, transformation ratio found experiment as to that decelerates bunches. In performed experiments, measured microwave probe. The magnitude is determined shift maximum spectrum magnetic...

The results of numerical PIC-simulation focusing accelerated (test) positron and drive electron bunches in the dielectric waveguide filled with radially heterogeneous plasma vacuum channel are given paper. wakefield was excited by bunch quartz tube, inserted into cylindrical metal waveguide. internal area tube has been different transverse density profiles, on radius, along axis. Plasma for all studied cases so low that frequency less, than main mode. Results PIC simulation have shown...

The nonlinear analysis of electron-beam amplification a wide packet monochromatic electromagnetic waves in the slow-wave structure with linear dispersion range is carried out. coaxial transmission line disks at internal and external conductors. Distribution electric field amplitudes averaged over cross-section has been investigated as function longitudinal coordinate. dependence characteristic maximum values excited on electron beam energy found. It shown, that an output signal spectrum can...

A result of numerical simulation acceleration the test electron bunch following a sequence relativistic bunches in rectangular dielectric resonator when filling drift channel with plasma different density is provided. We have found out that at change linear growth energy gain electrons observed. It connected structure ordering longitudinal accelerating electric field and also increase its amplitude. due to periodic injection drive on axis areas increased are formed.

The excitation by an electron beam of UHF oscillations in a coaxial slowing down transmission line with comb on internal and external cylinders is considered. analytical numerical analysis the received dispersion equation carried out. dependence gain energy investigated. It shown, that frequency has maximum nearby Cherenkov resonance eigen wave structure. Outside falls under linear law reduction frequency. nonlinear theory amplifier constructed basis chosen maximal amplitude longitudinal...

The results of studies wakefield excitation in a section dielectric tube inserted metal waveguide are presented. is shorter than waveguide. Dependences the longitudinal electric field registered some points from length For PIC simulations parameters experimental installation "Almaz-2" were chosen. It shown that radiated and recorded vacuum part cylindrical has character sinusoid growing when increasing tube. oscillation period equal to half wavelength E01 mode resonance with electron...

Wakefield excitation by a single relativistic electron bunch in plasma-dielectric accelerating structure has been studied both analytically and numerically. The represents dielectric-loaded cylindrical metal waveguide, which partially plasma-filled channel (the hollow plasma channel) to transport charged particles. Assuming the linear regime of excitation, analytical expressions have derived for longitudinal radial wakefields generated finite-size bunch. Axial profiles wakefield component...

The results of numerical PIC-simulation the dynamics accelerated positron and drive electron bunches under wake acceleration in a dielectric waveguide filled with plasma vacuum channel are presented. field was excited by an bunch quartz tube inserted into cylindrical metal waveguide. inner region along axis. difference energy spatial characteristics, efficiency, emittance, spread for is studied different radii two models density dependence on radius: homogeneous inhomogeneous characteristic...