The effect of superluminal phase velocity on electron acceleration in a powerful electromagnetic wave

2015 ◽  
Vol 22 (8) ◽  
pp. 083114 ◽  
Author(s):  
A. P. L. Robinson ◽  
A. V. Arefiev ◽  
V. N. Khudik
Keyword(s):  
Electromagnetic Wave ◽  
Phase Velocity ◽  
Electron Acceleration ◽  
Powerful Electromagnetic Wave

A Novel Method to Realize Zero Phase Delay of Electromagnetic Wave

2013 ◽  
Vol 760-762 ◽  
pp. 315-319
Author(s):  
Guo Yan Dong ◽  
Xiu Lun Yang ◽  
Xiang Feng Meng
Keyword(s):  
Electromagnetic Wave ◽  
Phase Velocity ◽  
Energy Flow ◽  
Phase Delay ◽  
Delay Propagation ◽  
Transmission Process ◽  
Transmitted Waves ◽  
Novel Method ◽  
Zero Index ◽  
Zero Phase

Zero phase delay of electromagnetic wave (EMW) transmission can be realized based on the wavefront modulation of photonic crystals (PhCs). When the phase velocity is controlled perpendicular to the group velocity with wavefronts (or phasefronts) parallel to the direction of energy flow, the phase will keep constant in transmission process despite of the increase of propagating length. The phase different between the incident and transmitted waves is measured to demonstrate that the phase can remain invariable in PhCs instead of zero-index materials or zero-averaged-index PhC superlattices. This effect can be extended to other artificially engineered materials, and will open a new route to obtain perfect zero-phase delay propagation for EMW.

Method for determining the intrinsic parameters of strip transmission lines

2021 ◽  
pp. 47-52
Author(s):  
Elena A. Lupanova ◽  
Sergey M. Nikulin
Keyword(s):  
Electromagnetic Wave ◽  
Phase Velocity ◽  
Transmission Lines ◽  
Electromagnetic Waves ◽  
Wave Impedance ◽  
Frequency Range ◽  
Intrinsic Parameters ◽  
S Parameter ◽  
Strip Lines ◽  
Phase Velocity And Attenuation

The features of the propagation of electromagnetic waves in strip transmission lines have been studied. Methods for measuring the phase velocity and attenuation coefficient of an electromagnetic wave in strip transmission lines are considered. The problem of the lack of methods for measuring their wave impedance is analyzed. A method is proposed for determining the intrinsic parameters of strip lines from the results of measurements by a vector analyzer of S-parameter circuits of electrically long and short lines in a coaxial channel. The intrinsic parameters of the strip lines are determined by the proposed method in the frequency range 0.01–26.50 GHz.

Electron acceleration by a circularly polarized electromagnetic wave publishing in plasma with a periodic magnetic field and an axial guide magnetic field

2018 ◽  
Vol 32 (20) ◽  
pp. 1850225 ◽  
Author(s):  
Mehdi Abedi-Varaki
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Wave ◽  
Laser Pulse ◽  
Electron Energy ◽  
Electron Acceleration ◽  
Electron Trajectory ◽  
Field Frequency ◽  
Circularly Polarized ◽  
Runge Kutta Method ◽  
Guide Magnetic Field

In this paper, we study the electron acceleration by a circularly polarized electromagnetic wave propagating through plasma in the presence of a periodic and an axial guide magnetic field. A numerical calculation in MATLAB software was developed by employing the fourth-order Runge–Kutta method for studying the electron energy and electron trajectory in plasma medium. The equations governing the electron momentum and energy which describe electron acceleration by a circularly polarized laser pulse have been obtained. It is shown that by choosing an appropriate wiggler field frequency at short distances, the electron retains an adequate amount of energy. In addition, it is found that due to the simultaneous existence of the wiggler field and field of laser pulse and their combined effects, the electron in the direction of the laser pulse propagating, turns around and subsequently, the electron transverse momentum increases and as a result the electron escapes from the laser pulse near the laser pulse peak. Furthermore, it is seen that by increasing the laser intensity, the electron energy decreases and by decreasing to an appropriate value while employing a wiggler magnetic field, a higher peak of energy is gained.

Sign in / Sign up

Export Citation Format

Share Document