Latest Research News on Electron Plasma: Dec – 2019

Ultrahigh-gradient acceleration of injected electrons by laser-excited relativistic electron plasma waves

High-gradient acceleration of outwardly injected two.1-MeV electrons by a optical device beat wave driven relativistic plasma wave has been incontestable  for the primary time. Electrons with energies up to the detection limit of nine.1 MeV were detected once such a plasma wave was resonantly excited employing a two-frequency optical device. this means a gradient of zero.7 GeV/m, like a plasma-wave amplitude of quite 8 May 1945. The lepton signal was below detection threshold while not injection or once the optical device was operated on one frequency. [1]

ON THE OSCILLATIONS OF AN ELECTRON PLASMA IN A MAGNETIC FIELD

The kinetic theory of gases of the oscillations of Associate in Nursing lepton plasma during a constant magnetic flux is examined. Associate in Nursing investigation is created of plasma oscillations of frequencies that area unit integral multiples of the gyromagnetic frequency. The indices of refraction area unit determined for the normal, the extraordinary and also the plasma waves that area unit propagated at Associate in Nursing arbitrary  angle alphabetic character with relation to the magnetic flux. it’s shown that at frequencies that area unit integral multiples of the gyromagnetic frequency the plasma wave is very damped if alphabetic character T < pi /2. If alphabetic character around pi /2 then the plasma waves akin to these frequencies can’t be propagated the least bit. The dimension of the gaps” within the frequency spectrum of the plasma oscillations is decided. [2]

Long-Time Containment of a Pure Electron Plasma

A pure negatron plasma has been confined in cylindrical pure mathematics for several minutes. Confinement scalings with background pressure and force field show that the utmost confinement times, while long, square measure 100-5000 times shorter than the limit set by electron-neutral collisions. [3]

Resonant plasma excitation by single-cycle THz pulses

In this paper, an alternate perspective for the generation of millimetric high-gradient resonant plasma waves is mentioned. This methodology is predicated on the plasma-wave excitation by energetic single-cycle THz pulses whose temporal length is cherish the plasma wavelength. The excitation regime mentioned during this paper is that the quasi-nonlinear regime that may be achieved once the normalized vector potential of the driving THz pulse is on the order of unity. to research this regime and confirm the strength of the excited electrical fields, a Particle-In-Cell (PIC) code has been used. [4]

Jeans Instability of Self-gravitating Porous Medium under the Effect of Electron Plasma Frequency and Coriolis Force

This paper deals with the theoretical investigation of the combined result of negatron plasma frequency and force on the hydromagnetic waves through a self gravitating porous medium within the presence of fine dirt particles subjected to a cross uniform field of force. A general dispersion relation is obtained victimization the traditional mode analysis with the assistance of relevant linearized perturbation equation of motion. This dispersion relation is reduced for longitudinal and cross modes of propagation. Dispersion relations for 2 modes square measure more reduced for the axis of rotation parallel and perpendicular to the direction of the field of force. we discover that Jean’s criterion of instability remains valid however the expression of the vital Jean’s frequency is changed. [5]

Reference

[1] Clayton, C.E., Marsh, K.A., Dyson, A., Everett, M., Lal, A., Leemans, W.P., Williams, R. and Joshi, C., 1993. Ultrahigh-gradient acceleration of injected electrons by laser-excited relativistic electron plasma waves. Physical review letters, 70(1), (Web Link)

[2] Sitenko, A.G. and Stepanov, K.N., 1957. On the oscillations of an electron plasma in a magnetic field. Soviet Phys. JETP, 4. (Web Link)

[3] Malmberg, J.H. and Driscoll, C.F., 1980. Long-time containment of a pure electron plasma. Physical Review Letters, 44(10), (Web Link)

[4] Resonant plasma excitation by single-cycle THz pulses
A. Curcio, A. Marocchino, V. Dolci, S. Lupi & M. Petrarca
Scientific Reports volume 8, (Web Link)

[5] Kumar, A., L. Sutar, D. and K. Pensia, R. (2017) “Jeans Instability of Self-gravitating Porous Medium under the Effect of Electron Plasma Frequency and Coriolis Force”, Physical Science International Journal, 13(2), (Web Link)

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