Stochastic acceleration of particles in the presence of high-frequency and low-frequency plasma turbulence

1990 ◽  
Vol 33 (8) ◽  
pp. 674-682 ◽  
Author(s):  
S. V. Vladimirov ◽  
V. S. Krivitskii
Keyword(s):  
High Frequency ◽  
Low Frequency ◽  
Plasma Turbulence ◽  
Acceleration Of Particles ◽  
Stochastic Acceleration ◽  
Frequency Plasma

scholarly journals A Facile, Low-Cost Plasma Etching Method for Achieving Size Controlled Non-Close-Packed Monolayer Arrays of Polystyrene Nano-Spheres

Nanomaterials ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 605 ◽  
Author(s):  
Yun Chen ◽  
Dachuang Shi ◽  
Yanhui Chen ◽  
Xun Chen ◽  
Jian Gao ◽  
...  
Keyword(s):  
Plasma Etching ◽  
Silicon Nanowires ◽  
High Frequency ◽  
Low Cost ◽  
Etching Rate ◽  
Low Frequency ◽  
Etching Time ◽  
High Frequency Plasma ◽  
Frequency Plasma ◽  
Etching System

Monolayer nano-sphere arrays attract great research interest as they can be used as templates to fabricate various nano-structures. Plasma etching, and in particular high-frequency plasma etching, is the most commonly used method to obtain non-close-packed monolayer arrays. However, the method is still limited in terms of cost and efficiency. In this study, we demonstrate that a low frequency (40 kHz) plasma etching system can be used to fabricate non-close-packed monolayer arrays of polystyrene (PS) nano-spheres with smooth surfaces and that the etching rate is nearly doubled compared to that of the high-frequency systems. The study reveals that the low-frequency plasma etching process is dominated by a thermal evaporation etching mechanism, which is different from the atom-scale dissociation mechanism that underlines the high-frequency plasma etching. It is found that the polystyrene nano-sphere size can be precisely controlled by either adjusting the etching time or power. Through introducing oxygen as the assisting gas in the low frequency plasma etching system, we achieved a coalesced polystyrene nano-sphere array and used it as a template for metal-assisted chemical etching. We demonstrate that the method can significantly improve the aspect ratio of the silicon nanowires to over 200 due to the improved flexure rigidity.

The evolution of probability characteristics of low-frequency plasma turbulence

2012 ◽  
Vol 4 (1) ◽  
pp. 10-25 ◽  
Author(s):  
G. M. Batanov ◽  
A. K. Gorshenin ◽  
V. Yu. Korolev ◽  
D. V. Malakhov ◽  
N. N. Skvortsova
Keyword(s):  
Low Frequency ◽  
Plasma Turbulence ◽  
Frequency Plasma

Observation of nonlinear coupling between drift and ion-acoustic oscillations in low-frequency plasma turbulence

2001 ◽  
Vol 27 (1) ◽  
pp. 56-61
Author(s):  
A. E. Petrov ◽  
K. A. Sarksyan ◽  
N. N. Skvortsova ◽  
N. K. Kharchev
Keyword(s):  
Low Frequency ◽  
Plasma Turbulence ◽  
Nonlinear Coupling ◽  
Acoustic Oscillations ◽  
Frequency Plasma ◽  
Ion Acoustic

Change in Primordial Abundances Due to a Change in the Primordial Plasma Energy Density

2000 ◽  
Vol 198 ◽  
pp. 116-117
Author(s):  
M. Opher ◽  
R. Opher
Keyword(s):  
Energy Density ◽  
High Frequency ◽  
Low Frequency ◽  
Plasma Fluctuations ◽  
Neutron Temperature ◽  
Plasma Energy ◽  
Primordial Plasma ◽  
High Frequency Plasma ◽  
Frequency Plasma ◽  
The Universe

We recently showed that the energy density of a plasma is appreciably different than previously thought when high frequency plasma fluctuations, ω ≥ kB/ħ, are taken into account (M. Opher &R. Opher, 1999). A change in the primordial plasma energy density changes the primordial expansion rate of the universe, the neutron temperature freeze-out, and the primordial nucleosythesis abundances. The change in the primordial abundances due to the change in the primordial plasma energy density is evaluated, taking into account the high frequency, as well as the low frequency fluctuations of the plasma.

scholarly journals High-frequency Magnetic Fluctuations in Space Plasmas and the Role of Electron Landau Damping

2022 ◽  
Vol 924 (2) ◽  
pp. L26
Author(s):  
Vincenzo Carbone ◽  
Daniele Telloni ◽  
Fabio Lepreti ◽  
Antonio Vecchio
Keyword(s):  
High Frequency ◽  
Interplanetary Space ◽  
Magnetic Energy ◽  
Low Frequency ◽  
Theoretical Models ◽  
Landau Damping ◽  
Magnetic Fluctuations ◽  
Frequency Plasma ◽  
New Framework

Abstract While low-frequency plasma fluctuations in the interplanetary space have been successfully described in the framework of classical turbulence, high-frequency fluctuations still represent a challenge for theoretical models. At these scales, kinetic plasma processes are at work, but although some of them have been identified in spacecraft measurements, their global effects on observable quantities are sometimes not fully understood. In this paper we present a new framework to the aim of describing the observed magnetic energy spectrum and directly identify in the data the presence of Landau damping as the main collisionless dissipative process in the solar wind.

On investigation of the fine structure of processes in low-frequency plasma turbulence

2013 ◽  
Author(s):  
Andrey K. Gorshenin ◽  
Victor Yu. Korolev ◽  
German M. Batanov ◽  
Nina N. Skvortsova ◽  
Dmitry V. Malakhov
Keyword(s):  
Fine Structure ◽  
Low Frequency ◽  
Plasma Turbulence ◽  
Frequency Plasma

Spectral characteristics of low-frequency plasma turbulence upstream of comet P/Halley

1989 ◽  
Vol 94 (A1) ◽  
pp. 37 ◽  
Author(s):  
K.-H. Glassmeier ◽  
A. J. Coates ◽  
M. H. Acuña ◽  
M. L. Goldstein ◽  
A. D. Johnstone ◽  
...  
Keyword(s):  
Spectral Characteristics ◽  
Low Frequency ◽  
Plasma Turbulence ◽  
Frequency Plasma
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