Abstract The recent Parker Solar Probe observations of type III radio bursts show that the effects finite background magnetic field can be an important factor in interpretation data. In present paper, on plasma-emission process, which is believed to main emission mechanism for solar coronal and interplanetary bursts, are investigated by means particle-in-cell simulation method. ambient systemat...

The standard model prediction for a magnetic dipole moment of a neutrino is proportional to the neutrino mass and extremely small. It also generates a flavor-changing process, but the GIM mechanism reduces the corresponding amplitude. These properties of a neutrino magnetic moment change drastically in a degenerate electron plasma. We have shown that an electron-hole excitation gives a contribu...

It is known that vacuum polarization can modify the photon propagation modes in the atmospheric plasma of a strongly magnetized neutron star. A resonance occurs when the effect of vacuum polarization on the photon modes balances that of the plasma. We show that a photon (with energy E >∼ a few keV) propagating outward in the atmosphere can convert from one polarization mode into another as it t...

Pulsar magnetospheres admit non-stationary vacuum gaps that are characterized by non-vanishing ${\bf{E}} \cdot {\bf{B}}$. The play an important role in plasma production and electromagnetic wave emission. We show these generate axions whose energy is set the gap oscillation frequency. density of produced a can be several orders magnitude greater than ambient dark matter density. In strong pulsa...

We predict the self-excitation of terahertz (THz) oscillations due to plasma instability in lateral n+-i-n-n+ graphene field-effect transistors (G-FETs). The is associated with Coulomb drag quasi-equilibrium electrons gated channel by injected ballistic resulting a positive feedback between amplified dragged current and current. excitations arise when effect sufficiently strong. efficiency freq...

The author of the paper presents a quite new theoretical model of a double radiosource designed on the basis of the data of radiotelescopic observations and the new conception of the physics of active cores of galaxies. The paper contains a detailed description of the physics of the central point source of radiogalaxy, the mechanism of the doublesided ejection of the relativistic plasma and the...

Powerful coherent emission around the plasma oscillation frequency can be produced from a laser wakefield through linear mode conversion. This occurs when the laser pulse is incident obliquely to the density gradient of inhomogeneous plasmas. The emission spectrum and conversion efficiency are obtained analytically, which are in agreement with particle-in-cell simulations. The emission can be t...

Microbunching instability is one of the most challenging threats to FEL performances. The most effective ways to cure the microbunching instability include suppression of the density modulation sources and suppression of the amplification process. In this paper we study the microbunching instability in velocity bunching. Our simulations show that the initial current and energy modulations are s...

We report on a broadband terahertz emission from a doubly interdigitated grating gates high electron mobility transistor. The observed emission was explained as due to the excitation of multi mode of plasmons: thermally excited incoherent modes and instability-driven coherent modes. The experiment was performed using Fourier spectrometer system coupled with high sensitive 4K Silicon bolometer u...

The evolution of beam phase space in ionization injection into plasma wakefields is studied using theory and particle-in-cell simulations. The injection process involves both longitudinal and transverse phase mixing, leading initially to a rapid emittance growth followed by oscillation, decay, and a slow growth to saturation. An analytic theory for this evolution is presented and verified throu...