Broadband Instability of the Whistler Band in a Magnetized Plasma Density Depletion with a Parallel Current

JETP Letters ◽  
2021 ◽  
Vol 113 (2) ◽  
pp. 86-91
Author(s):  
I. Yu. Zudin ◽  
M. E. Gushchin ◽  
N. A. Aidakina ◽  
S. V. Korobkov ◽  
A. V. Strikovskiy
Keyword(s):  
Plasma Density ◽  
Magnetized Plasma ◽  
Density Depletion ◽  
Parallel Current

The use of high‐order TM0m0modes of a resonant cavity for magnetized plasma density measurements

1990 ◽  
Vol 67 (1) ◽  
pp. 124-129 ◽  
Author(s):  
P. J. Paris ◽  
M. L. Sawley ◽  
M. Q. Tran ◽  
K. Voser
Keyword(s):  
Plasma Density ◽  
Resonant Cavity ◽  
High Order ◽  
Magnetized Plasma ◽  
Density Measurements

Transmission characteristics of terahertz Bessel vortex beams through a multi-layered anisotropic magnetized plasma slab

2021 ◽  
Author(s):  
Haiying Li ◽  
Jiachen Tong ◽  
Wei Ding ◽  
Bing Xu ◽  
Lu Bai
Keyword(s):  
Magnetic Field ◽  
Plasma Density ◽  
Applied Magnetic Field ◽  
Incident Angle ◽  
Polarization State ◽  
Major Effect ◽  
Magnetized Plasma ◽  
Transmitted Beam ◽  
Plasma Slab ◽  
Vortex Beams

Abstract The transmission of terahertz (THz) Bessel vortex beams through a multi-layered anisotropic magnetized plasma slab is investigated by using a hybrid method of cylindrical vector wave functions (CVWFs) and Fourier transform. On the basis of the electromagnetic boundary conditions on each interface, a cascade form of expansion coefficients of the reflected and transmitted fields is obtained. Taking a double Gaussian distribution of the plasma density as an example, the influences of the applied magnetic field, the incident angle and polarization mode of the incident beams on the magnitude, OAM mode and polarization of the transmitted beams are analyzed in detail. The results indicate that the applied magnetic field has a major effect upon the polarization state of the transmitted fields but not upon the transmitted OAM spectrum. The incident angle has a powerful influence upon both the amplitude profile and the OAM spectrum of the transmitted beam. Furthermore, for multiple coaxial vortex beams, an increase of the maximum value of the plasma density causes more remarkable distortion of both the profile and OAM spectrum of the transmitted beam. This research makes a stable foundation for the THz OAM multiplexing/demultiplexing technology in magnetized plasma environment.

scholarly journals GAS DISCHARGE IN PLASMA-METAL WAVEGUIDE WITH VARYING RADIUS OF METAL ENCLOSURE PARTIALLY FILLED BY RADIALLY NON-UNIFORM MAGNETIZED PLASMA

2020 ◽  
pp. 69-73
Author(s):  
N.A. Azarenkov ◽  
V.P. Olefir ◽  
A.E. Sporov
Keyword(s):  
Plasma Density ◽  
Theoretical Study ◽  
Gas Discharge ◽  
Waveguide Structure ◽  
Magnetized Plasma ◽  
Axial Distribution ◽  
Density Profiles ◽  
Metal Waveguide ◽  
Steady Magnetic Field ◽  
Uniform Plasma

The article presents the results of theoretical study of phase and attenuation characteristics of the symmetric electromagnetic wave in long waveguide structure that partially filled by radially non-uniform plasma immersed in external steady magnetic field. The results of theoretical study of stationary gas discharge sustained by this wave in the considered waveguide structure with slightly varying radius of metal enclosure in the framework of electrodynamic model are presented as well. It was studied the influence of the effective plasma collision frequency on the phase and attenuation wave properties and on the plasma density axial distribution in gas discharge considered for different radial plasma density profiles.

Dispersion of dipolar electromagnetic waves in a radially inhomogeneous axially magnetized plasma column

1997 ◽  
Vol 58 (4) ◽  
pp. 633-646 ◽  
Author(s):  
I. GHANASHEV ◽  
I. ARESTOVA ◽  
E. TATAROVA ◽  
I. ZHELYAZKOV ◽  
Sv. STOYKOV
Keyword(s):  
Plasma Density ◽  
Plasma Column ◽  
Electromagnetic Waves ◽  
Wave Attenuation ◽  
Magnetized Plasma ◽  
Plasma Inhomogeneity ◽  
Polarized Waves ◽  
Plasma Density Profile ◽  
Order Of Magnitude ◽  
Radially Inhomogeneous

The wavelengths and attenuation coefficients of dipolar left and right-hand circularly polarized waves in a radially inhomogeneous axially magnetized plasma column are computed by means of step approximation of the radial plasma density profile. A comparison with theoretical results assuming radial plasma homogeneity shows that the radial plasma inhomogeneity is significant for wave propagation. In particular, it facilitates the occurrence of backward waves and increases by up to one order of magnitude the wave attenuation coefficient compared with a homogeneous plasma column having the same average plasma density.

scholarly journals Computer Simulations of Electromagnetic Emissions Produced via Injection of Electron Beam into a Plasma with Strong Transverse Density Gradients

2019 ◽  
Vol 14 (4) ◽  
pp. 5-16
Author(s):  
V. V. Glinskiy ◽  
I. V. Timofeev ◽  
V. V. Annenkov ◽  
A. V. Arzhannikov
Keyword(s):  
Magnetic Field ◽  
Plasma Density ◽  
Plasma Frequency ◽  
Spatial Scales ◽  
Longitudinal Direction ◽  
Magnetized Plasma ◽  
Density Gradients ◽  
The Real ◽  
Particle In Cell ◽  
Strong Transverse

Recent experiments on the injection of kiloampere electron beams into a magnetized plasma at the GOL-PET facility have shown that the power of sub-terahertz radiation escaping from the plasma along the magnetic field increases by more than an order of magnitude if strong transverse density gradients are preliminarily created in the plasma. In this paper, the influence of transverse in homogeneities of plasma density on the efficiency of electromagnetic radiation generation near the harmonics of the plasma frequency is studied using particle-in-cell simulations. Simulations performed for the real relative density of the beam and the real spatial scales of the in homogeneity show that the beam instability develops only in the density wells, and the small transverse size of its localization comparable with the wavelength contributes to a more efficient conversion of unstable oscillations into electromagnetic ones. Despite the fact that radiation at the plasma frequency is blocked across the leading magnetic field, it can leave the generation region with the decrease of the plasma density in the longitudinal direction.

The intrinsic electromagnetic solitary vortices in magnetized plasma

1986 ◽  
Vol 36 (1) ◽  
pp. 1-24 ◽  
Author(s):  
Jixing Liu ◽  
Wendell Horton
Keyword(s):  
Magnetic Field ◽  
Differential Equations ◽  
Fourth Order ◽  
Magnetized Plasma ◽  
Dipole Structure ◽  
Vortex Solutions ◽  
New Type ◽  
Special Solutions ◽  
Parallel Current ◽  
Perturbed Magnetic Field

Several Rossby-type vortex solutions constructed for electromagnetic perturbations in magnetized plasma encounter the difficulty that the perturbed magnetic field and the parallel current are not continuous on the boundary between two regions. We find that fourth-order differential equations must be solved to remove this discontinuity. Special solutions for two types of boundary value problem for the fourth-order partial differential equations are presented. By applying these solutions to different nonlinear equations in magnetized plasma, the intrinsic electromagnetic solitary drift-Alfvén vortex (along with solitary Alfvén vortex) and the intrinsic electromagnetic solitary electron vortex (along with short-wavelength drift vortex) are constructed. While still keeping a localized dipole structure, these new vortices have more complicated radial structures in the inner and outer regions than the usual Rossby-wave vortex. The new type of vortex guarantees the continuity of the perturbed magnetic field δB⊥ and the parallel current j‖ on the boundary between inner and outer regions of the vortex. The allowed regions of propagation speeds for these vortices are analysed, and we find that the complementary relation between the vortex propagating speeds and the corresponding phase velocities of the linear modes no longer exists.

scholarly journals The Alfvén edge in asymmetric reconnection

2010 ◽  
Vol 28 (6) ◽  
pp. 1327-1331 ◽  
Author(s):  
A. Vaivads ◽  
A. Retinò ◽  
Yu. V. Khotyaintsev ◽  
M. André
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
Magnetic Reconnection ◽  
Current Sheet ◽  
Plasma Density ◽  
The Other ◽  
Alfven Wave ◽  
Wave Pulse ◽  
Parallel Current ◽  
Alfven Velocity

Abstract. We show that in the case of magnetic reconnection where the Alfvén velocity is much higher in the plasma on one side of the current sheet than the other, an Alfvén edge is formed. This edge is located between the electron and ion edges on the high Alfvén velocity side of the current sheet. The Alfvén edge forms because the Alfvén wave generated near the X-line will propagate faster than the accelerated ions forming the ion edge. We discuss possible generation mechanism and the polarization of the Alfvén wave in the case when higher Alfvén speed is due to larger magnetic field and smaller plasma density, as in the case of magnetopause reconnection. The Alfvén wave can be generated due to Hall dynamics near the X-line. The Alfvén wave pulse has a unipolar electric field and the parallel current will be such that the outer current on the high magnetic field side is flowing away from the X-line. Understanding Alfvén edges is important for understanding the separatrix regions at the boundaries of reconnection jets. We present an example of Alfvén edge observed by the Cluster spacecraft at the magnetopause.

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