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MICROWAVE NOISE MEASUREMENT OF ELECTRON TEMPERATURES IN AFTERGLOW PLASMAS

Abstract

Transient electron temperatures in afterglow plasmas were determined for He (5 and 10 torr), Ne, and Ne plus or minus 5% Ar (2.4 and 24 torr) by combining measurements of plasma microwave noise power, and plasma reflectivity and absorptivity. Use of a low-noise parametric preamplifier permitted continuous detection during the afterglow of noise power at 5.5 Bc in a 1 Mc bandwidth. Electron temperature decays were a function of pressure and gas but were slower than predicted by electron energy loss mechanisms. The addition of argon altered the electron density decay in the neon afterglow but the electron temperature decay was not appreciably changed. Resonances in detected noise power vs time in the afterglow were observed for two of the three plasma waveguide geometries studied. These resonances correlate with observed resonances in absorptivity and occur over the same range of electron densities for a given geometry independent of gas type and pressure. (auth)
Publication Date:
Oct 15, 1963
Product Type:
Conference
Report Number:
CONF-364-2; AED-Conf-62-195-2
Reference Number:
NSA-18-009551
Resource Relation:
Conference: 16th Annual Gaseous Electronics Conference, Pittsburgh, PA (United States) 16-18 Oct 1963
Subject:
PHYSICS; ABSORPTION; ARGON; CIRCUITS; CONFIGURATION; DECAY; ELECTRONIC EQUIPMENT; ELECTRONS; ENERGY; GLOW DISCHARGES; HELIUM; LOSSES; MEASURED VALUES; MICROWAVES; NEON; NOISE; PLASMA; PRESSURE; REFLECTION; RESONANCE; TEMPERATURE
Sponsoring Organizations:
Sponsor not identified
OSTI ID:
4879285
Research Organizations:
Sperry Rand Research Center, Sudbury, MA (United States)
Country of Origin:
United States
Language:
English
Submitting Site:
DTIE
Size:
Pages: 21
Announcement Date:
Aug 16, 2013

Citation Formats

Leiby, Jr., C. C., and McBee, W. D. MICROWAVE NOISE MEASUREMENT OF ELECTRON TEMPERATURES IN AFTERGLOW PLASMAS. United States: N. p., 1963. Web.
Leiby, Jr., C. C., & McBee, W. D. MICROWAVE NOISE MEASUREMENT OF ELECTRON TEMPERATURES IN AFTERGLOW PLASMAS. United States.
Leiby, Jr., C. C., and McBee, W. D. 1963. "MICROWAVE NOISE MEASUREMENT OF ELECTRON TEMPERATURES IN AFTERGLOW PLASMAS." United States.
@misc{etde_4879285,
title = {MICROWAVE NOISE MEASUREMENT OF ELECTRON TEMPERATURES IN AFTERGLOW PLASMAS}
author = {Leiby, Jr., C. C., and McBee, W. D.}
abstractNote = {Transient electron temperatures in afterglow plasmas were determined for He (5 and 10 torr), Ne, and Ne plus or minus 5% Ar (2.4 and 24 torr) by combining measurements of plasma microwave noise power, and plasma reflectivity and absorptivity. Use of a low-noise parametric preamplifier permitted continuous detection during the afterglow of noise power at 5.5 Bc in a 1 Mc bandwidth. Electron temperature decays were a function of pressure and gas but were slower than predicted by electron energy loss mechanisms. The addition of argon altered the electron density decay in the neon afterglow but the electron temperature decay was not appreciably changed. Resonances in detected noise power vs time in the afterglow were observed for two of the three plasma waveguide geometries studied. These resonances correlate with observed resonances in absorptivity and occur over the same range of electron densities for a given geometry independent of gas type and pressure. (auth)}
place = {United States}
year = {1963}
month = {Oct}
}