Parametric excitation of electromagnetic and surface plasma waves of a ribbon electron beam in a periodic magnetic field

1990 ◽  
Vol 33 (4) ◽  
pp. 363-370
Author(s):  
K. O. Kachalov ◽  
N. G. Popkov
Keyword(s):  
Magnetic Field ◽  
Electron Beam ◽  
Parametric Excitation ◽  
Plasma Waves ◽  
Surface Plasma ◽  
Periodic Magnetic Field ◽  
Surface Plasma Waves

Scattering of an unmagnetized sheet electron beam by surface plasma waves

1992 ◽  
Vol 35 (1) ◽  
pp. 58-65
Author(s):  
S. S. Moiseev ◽  
O. Yu. Naguchev ◽  
V. I. Tkachenko ◽  
V. N. Dubovik
Keyword(s):  
Electron Beam ◽  
Plasma Waves ◽  
Surface Plasma ◽  
Surface Plasma Waves ◽  
Sheet Electron Beam

scholarly journals Electron acceleration by surface plasma waves in the presence of static magnetic field

2015 ◽  
Vol 33 (1) ◽  
pp. 109-115 ◽  
Author(s):  
Prashant Chauhan ◽  
Deepika Anshu Varshney ◽  
Vivek Sajal
Keyword(s):  
Magnetic Field ◽  
Electron Beam ◽  
Static Magnetic Field ◽  
Electron Acceleration ◽  
Resonant Interaction ◽  
Zero Magnetic Field ◽  
Surface Plasma ◽  
Amplitude Maximum ◽  
Surface Plasma Waves ◽  
Metal Sheets

AbstractElectron acceleration is studied during the resonant interaction of launched electron beam with the surface plasma wave (SPW) in the presence of static magnetic field. A configuration of two parallel metal sheets separated by a vacuum region supports the SPW of amplitude maximum on the two parallel interfaces and minimum in the middle. Kretschmann geometry is used to excite surface plasma mode by shinning laser on a glass prism. Dispersion relation of SPW is established in the presence of magnetic field and smaller cut-off frequencies are observed as compared with that of without magnetic field. An electron beam launched in the middle region, experiences a longitudinal ponderomotive force due to SPWs and gets accelerated to the velocity of the order of phase velocity of the surface wave. The energy gained by electron is higher in the presence of magnetic field as compared with zero magnetic field. The electron energy and trajectory are also presented for varying parameters such as amplitude of SPW and magnetic field strength. In the present scheme, electron beams can achieve maximum 550 KeV energy for the SPW amplitude ESP = 1.2 × 1011 V/m, plasma frequency ωp = 1.3 × 1016 rad/s, and cyclotron frequency ωc/ωp = 0.05.

scholarly journals Parametric excitation of surface plasma waves over a metallic surface by laser in an external magnetic field

2018 ◽  
Vol 36 (1) ◽  
pp. 92-97
Author(s):  
Prashant Chauhan ◽  
Deepika Goel ◽  
Anshu Varshney ◽  
D. B. Singh ◽  
Vivek Sajal
Keyword(s):  
Magnetic Field ◽  
Growth Rate ◽  
Space Charge ◽  
Ponderomotive Force ◽  
Laser Energy ◽  
Incidence Angle ◽  
Plasma Waves ◽  
Metallic Surface ◽  
Surface Plasma ◽  
Surface Plasma Waves

AbstractEffects of external static magnetic field (applied in$\hat y$-direction) on resonant excitation of surface plasma waves (SPW) have been investigated over the metal free space interface. The high power laser$({\rm \omega} _0,\;\vec k_{0z})$is incident over the metal surface and exerts a ponderomotive force on the metal electrons in the skin layer. The ponderomotive force disturbs the quasi-neutrality of plasma which results into the excitation of space charge field at the frequency 2ω0. The electron density perturbation at frequency 2ω0driven by self-consistent space charge potential couples with the oscillatory velocity due to the seed SPW$({\rm \omega}, \;\vec k_z)$and produces nonlinear current to drive another counter propagating SPW$({\rm \omega} _1,\;\vec k_{1z})$at the phase matching conditions of frequency ω = ω1− 2ω0and wavenumber$\vec k_z = \vec k_{1z} - 2\vec k{}_{0z}$(by feedback mechanism). The parametric process becomes resonant at 2ω0≈ ωpand the maximum growth rate is achieved for an incidence angle of laser θ = 40°. The growth rate of the process reduces to half on increasing the magnetic field from 0.49 to 2.45 MG. The present study may be significant to the laser absorption experiments where surface rippling can strongly affect the laser energy absorption.

scholarly journals Surface plasma waves induced electron acceleration in a static magnetic field

2016 ◽  
Vol 34 (3) ◽  
pp. 474-479 ◽  
Author(s):  
D. Goel ◽  
P. Chauhan ◽  
A. Varshney ◽  
V. Sajal
Keyword(s):  
Magnetic Field ◽  
Static Magnetic Field ◽  
Equations Of Motion ◽  
Maximum Amplitude ◽  
Plasma Waves ◽  
Surface Plasma ◽  
Present Scheme ◽  
Surface Plasma Waves ◽  
Vacuum Interface ◽  
Interface Equations

AbstractThe acceleration of an electron beam by surface plasma waves (SPW), in the presence of external magnetic field parallel to surface and perpendicular to direction of propagation of SPW has been studied. This wave propagating along the$\hat z$-axis is excited using Kretschmann geometry, having maximum amplitude at the metal–vacuum interface. Equations of motion have been solved for electron energy and trajectory. The electron gains and retains energy in the form of cyclotron oscillations due to the combined effect of the static magnetic field and SPW field. The energy gained by the beam increases with the strength of magnetic field and laser intensity. In the present scheme, electron beams can achieve ~15 KeV energy for the SPW amplitudeA1= 1.6 × 1011V/m, plasma frequency ωp= 1.3 × 1016rad/s and cyclotron frequency ωc/ωp= 0.003.

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