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Title: Energy efficiency of electron plasma emitters

Abstract

Electron emission influence from gas-discharge plasma on plasma emitter energy parameters is considered. It is shown, that electron emission from plasma is accompanied by energy contribution redistribution in the gas-discharge from plasma emitter supplies sources-the gas-discharge power supply and the accelerating voltage power supply. Some modes of electron emission as a result can be realized: 'a probe measurements mode,' 'a transitive mode,' and 'a full switching mode.'.

Authors:
 [1]
  1. Polotsk State University (Belarus)
Publication Date:
OSTI Identifier:
22047453
Resource Type:
Journal Article
Resource Relation:
Journal Name: Plasma Physics Reports; Journal Volume: 37; Journal Issue: 13; Other Information: Copyright (c) 2011 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ELECTRIC DISCHARGES; ELECTRIC POTENTIAL; ELECTRON EMISSION; ELECTRONS; ENERGY EFFICIENCY; PLASMA; PLASMA DIAGNOSTICS; PROBES

Citation Formats

Zalesski, V. G., E-mail: V.Zalesski@mail.ru. Energy efficiency of electron plasma emitters. United States: N. p., 2011. Web. doi:10.1134/S1063780X11090145.
Zalesski, V. G., E-mail: V.Zalesski@mail.ru. Energy efficiency of electron plasma emitters. United States. doi:10.1134/S1063780X11090145.
Zalesski, V. G., E-mail: V.Zalesski@mail.ru. Thu . "Energy efficiency of electron plasma emitters". United States. doi:10.1134/S1063780X11090145.
@article{osti_22047453,
title = {Energy efficiency of electron plasma emitters},
author = {Zalesski, V. G., E-mail: V.Zalesski@mail.ru},
abstractNote = {Electron emission influence from gas-discharge plasma on plasma emitter energy parameters is considered. It is shown, that electron emission from plasma is accompanied by energy contribution redistribution in the gas-discharge from plasma emitter supplies sources-the gas-discharge power supply and the accelerating voltage power supply. Some modes of electron emission as a result can be realized: 'a probe measurements mode,' 'a transitive mode,' and 'a full switching mode.'.},
doi = {10.1134/S1063780X11090145},
journal = {Plasma Physics Reports},
number = 13,
volume = 37,
place = {United States},
year = {Thu Dec 15 00:00:00 EST 2011},
month = {Thu Dec 15 00:00:00 EST 2011}
}
  • The method proposed to determine the electron energy distribution is based on the numerical simulation of the effect induced by a sinusoidal perturbation superimposed to the direct current voltage applied to the probe. The simulation is generating a multiple harmonic components signal over the rough experimental data. Each harmonic component can be isolated by means of finite impulse response filters. Then, the second derivative is deduced from the second harmonic component using the Taylor expansion. The efficiency of the method is proved first on simple cases and second on typical Langmuir probes characteristics recorded in the expansion of a microwavemore » plasma containing argon or nitrogen-hydrogen gas mixture. Results obtained using this method are compared to those, which are determined using a classical Savitzsky-Golay filter.« less
  • The energy distribution of electrons emitted from an Al/Al{sub 2}O{sub 3}/Au metal--insulator--metal (MIM) electron emitter is measured. The thickness of the insulator is 5.5 nm. The energy distribution becomes narrower as the operating voltage {ital V}{sub {ital d}} decreases since the low energy tail of the distribution is cut off by the potential barrier of the surface work function {phi} of the emitter. When the emitter is operated in the nonformed state, {Delta}{ital E}, the full width at half-maximum of the distribution, is 0.32 eV for {ital V}{sub {ital d}}=5.0 V, which is slightly above {phi} of Au (4.7 eV).more » As {ital V}{sub {ital d}} increases, the high-energy tail of the distribution broadens whereas the shape of the low-energy tail remains unchanged. For a formed MIM emitter, {Delta}{ital E} becomes broader by 0.15--0.2 eV more than {Delta}{ital E} of a nonformed emitter at each {ital V}{sub {ital d}}; thus, operation in the nonformed state is essential to obtain good monochromaticity. The spatial distribution of the work function in the emitter surface is also measured by the retarding potential method. The variation of {phi}, which limits the ultimately attainable monochromaticity with the near-threshold drive method, is measured as 0.05 eV. It is estimated that {Delta}{ital E} less than 0.2 eV could be attained by the near-threshold drive if the insulator thickness and {ital V}{sub {ital d}} are further reduced. {copyright} {ital 1995} {ital American} {ital Vacuum} {ital Society}« less
  • A model of the plasma electron emitter is considered, in which the current redistribution over electrodes of the emitter gas-discharge structure and weak electric field formation in plasma are taken into account as functions of the emission current. The calculated and experimental dependences of the switching parameters, extraction efficiency, and strength of the electric field in plasma on the accelerating voltage and geometrical sizes of the emission channel are presented.