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Title: Beat wave launch of lower-hybrid wave for alpha particle diagnostic

Abstract

By use of nonlinear mixing of oppositely-directed pump waves of frequency {ital f}{sub 0}{plus_minus}{delta}{ital f}{gt}{ital f}{sub {ital pe}},{ital f}{sub {ital ce}}, a beat wave of frequency {ital f}{sub 12}=2{delta}{ital f} and velocity {ital v}{sub 12}={ital c}{delta}{ital f}/{ital f}{sub 0} may be launched deeply into the interior of a confined plasma. For launch perpendicular to magnetic field at a beat frequency in the lower-hybrid range, {ital f}{sub {ital ci}}{lt}{ital f}{sub 12}{lt}{ital f}{sub {ital ce}}, wave damping is proportional to the local derivative of the fast ion distribution function, {partial_derivative}{ital f}{sub {alpha}}/{ital dv}{parallel}{sub {ital v}}{sub 12}, thus providing (in combination with a wave-scattering diagnostic) a potential means for direct, noninvasive measurement of the local alpha-particle distribution. Present experiments on the Davis Divertor Torus (DDT) are aimed at developing quantitative agreement between computed and actual Langmuir probe measurements of spatial and temporal beat-wave distributions in a three-dimensional plasma volume. {copyright} {ital 1996 American Institute of Physics.}

Authors:
; ; ;  [1];  [2]
  1. UC Davis/LLNL Livermore, California 94551 (United States)
  2. Princeton Plasma Physics Laboratory, Princeton, New Jersey (United States)
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
284162
Report Number(s):
CONF-9505105-
Journal ID: APCPCS; ISSN 0094-243X; TRN: 96:020048
DOE Contract Number:  
FG03-94ER54269
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 355; Journal Issue: 1; Conference: 11. topical conference on radio frequency in plasmas, Palm Springs, CA (United States), 17-19 May 1995; Other Information: PBD: Feb 1996
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; PLASMA DIAGNOSTICS; ALPHA PARTICLES; LANGMUIR PROBE; HOT PLASMA; LOWER HYBRID HEATING; PLASMA DENSITY; ANTENNAS; BEATS

Citation Formats

Horton, R.D., Evans, R.W., Hwang, D.Q., McLean, H.S., and Rogers, J.H. Beat wave launch of lower-hybrid wave for alpha particle diagnostic. United States: N. p., 1996. Web. doi:10.1063/1.49500.
Horton, R.D., Evans, R.W., Hwang, D.Q., McLean, H.S., & Rogers, J.H. Beat wave launch of lower-hybrid wave for alpha particle diagnostic. United States. doi:10.1063/1.49500.
Horton, R.D., Evans, R.W., Hwang, D.Q., McLean, H.S., and Rogers, J.H. Thu . "Beat wave launch of lower-hybrid wave for alpha particle diagnostic". United States. doi:10.1063/1.49500.
@article{osti_284162,
title = {Beat wave launch of lower-hybrid wave for alpha particle diagnostic},
author = {Horton, R.D. and Evans, R.W. and Hwang, D.Q. and McLean, H.S. and Rogers, J.H.},
abstractNote = {By use of nonlinear mixing of oppositely-directed pump waves of frequency {ital f}{sub 0}{plus_minus}{delta}{ital f}{gt}{ital f}{sub {ital pe}},{ital f}{sub {ital ce}}, a beat wave of frequency {ital f}{sub 12}=2{delta}{ital f} and velocity {ital v}{sub 12}={ital c}{delta}{ital f}/{ital f}{sub 0} may be launched deeply into the interior of a confined plasma. For launch perpendicular to magnetic field at a beat frequency in the lower-hybrid range, {ital f}{sub {ital ci}}{lt}{ital f}{sub 12}{lt}{ital f}{sub {ital ce}}, wave damping is proportional to the local derivative of the fast ion distribution function, {partial_derivative}{ital f}{sub {alpha}}/{ital dv}{parallel}{sub {ital v}}{sub 12}, thus providing (in combination with a wave-scattering diagnostic) a potential means for direct, noninvasive measurement of the local alpha-particle distribution. Present experiments on the Davis Divertor Torus (DDT) are aimed at developing quantitative agreement between computed and actual Langmuir probe measurements of spatial and temporal beat-wave distributions in a three-dimensional plasma volume. {copyright} {ital 1996 American Institute of Physics.}},
doi = {10.1063/1.49500},
journal = {AIP Conference Proceedings},
number = 1,
volume = 355,
place = {United States},
year = {1996},
month = {2}
}