You need JavaScript to view this

ELECTRON ENERGY DECAY IN HELIUM AFTERGLOW PLASMAS AT CRYOGENIC TEMPERATURES

Abstract

Studies of decaying afterglow plasmas in helium were ined near 4 deg K by immersion in a liquid helium bath. By means of a Maser Radiometer System, the electron temperature was followed below 200 deg K. Guided microwave propagation and wave interaction techniques premit determination of election number density and collision frequencies for momentum transfer. Electron temperature decay rates of the order of 150 mu sec/p(mm Hg alpha 4.2 deg K) were found. Since thermal relaxation by elastic collisions should be some two orders of magnitude faster than this, the electrons appear to be in quasiequilibrium with a slowly decaying internal heating source. Correlation of the expected decay rates of singlet metastable helium atoms with the electron temperature decay gives good agreement with the present experiment. (auth)
Publication Date:
Oct 15, 1963
Product Type:
Conference
Report Number:
CONF-364-3; AED-Conf-195-6
Reference Number:
NSA-18-009552
Resource Relation:
Conference: 16th Annual Gaseous Electronics Conference, Pittsburgh, PA (United States) 16-18 Oct 1963
Subject:
PHYSICS; ABSORPTION; COLLISIONS; DECAY; DENSITY; ELASTICITY; ELECTRONS; ENERGY; FREQUENCY; GLOW DISCHARGES; HEATING; HELIUM; INTERACTIONS; LOW TEMPERATURE; MASERS; MICROWAVES; MOTION; PLASMA; RADIATIONS; STABILITY; THERMODYNAMICS
Sponsoring Organizations:
Sponsor not identified
OSTI ID:
4879286
Research Organizations:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Country of Origin:
United States
Language:
English
Submitting Site:
DTIE
Size:
Pages: 13
Announcement Date:
Aug 16, 2013

Citation Formats

Goldan, P. D., Cahn, J. H., and Goldstein, L. ELECTRON ENERGY DECAY IN HELIUM AFTERGLOW PLASMAS AT CRYOGENIC TEMPERATURES. United States: N. p., 1963. Web.
Goldan, P. D., Cahn, J. H., & Goldstein, L. ELECTRON ENERGY DECAY IN HELIUM AFTERGLOW PLASMAS AT CRYOGENIC TEMPERATURES. United States.
Goldan, P. D., Cahn, J. H., and Goldstein, L. 1963. "ELECTRON ENERGY DECAY IN HELIUM AFTERGLOW PLASMAS AT CRYOGENIC TEMPERATURES." United States.
@misc{etde_4879286,
title = {ELECTRON ENERGY DECAY IN HELIUM AFTERGLOW PLASMAS AT CRYOGENIC TEMPERATURES}
author = {Goldan, P. D., Cahn, J. H., and Goldstein, L.}
abstractNote = {Studies of decaying afterglow plasmas in helium were ined near 4 deg K by immersion in a liquid helium bath. By means of a Maser Radiometer System, the electron temperature was followed below 200 deg K. Guided microwave propagation and wave interaction techniques premit determination of election number density and collision frequencies for momentum transfer. Electron temperature decay rates of the order of 150 mu sec/p(mm Hg alpha 4.2 deg K) were found. Since thermal relaxation by elastic collisions should be some two orders of magnitude faster than this, the electrons appear to be in quasiequilibrium with a slowly decaying internal heating source. Correlation of the expected decay rates of singlet metastable helium atoms with the electron temperature decay gives good agreement with the present experiment. (auth)}
place = {United States}
year = {1963}
month = {Oct}
}