Electron cyclotron wave propagation, absorption, and backscatter measurements in a laboratory plasma

Broadband microwave propagation and absorption processes and backscatter from objects immersed in a magnetized, finite, warm plasma column is addressed. In particular, the propagation, absorption, and backscatter of electron cyclotron waves are measured and compared with bounded vacuum hot plasma wa...

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Published inIEEE transactions on plasma science Vol. 21; no. 3; pp. 271 - 281
Main Authors Scharer, J.E., Eldridge, O.C., Chang, S.-F.R., Zhang, Y.-S., Bettenhausen, M.H., Lam, N.T.
Format Journal Article
LanguageEnglish
Published New York, NY IEEE 01.06.1993
Institute of Electrical and Electronics Engineers
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ISSN0093-3813
1939-9375
DOI10.1109/27.277552

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Abstract Broadband microwave propagation and absorption processes and backscatter from objects immersed in a magnetized, finite, warm plasma column is addressed. In particular, the propagation, absorption, and backscatter of electron cyclotron waves are measured and compared with bounded vacuum hot plasma wave propagation, absorption, and ray tracing theory. The nonreciprocal nature of the transmission and absorption in an anisotropic plasma is measured. A homodyne technique which isolates the scattering from a single object in the plasma from the scattering from all other objects in the plasma and the walls of the containment device is developed and utilized. The range of absorption frequencies and nonreciprocity of the transmission signal are shown to be well correlated with wave trajectories in the associated regions of the Clemmow-Mullaly-Allis (CMA) diagram. It is shown that quasi-parallel propagation of electron cyclotron waves near resonance is present and that the transverse effects of wavenumber on propagation in the cylindrical plasma are small.< >
AbstractList Broadband microwave propagation and absorption processes and backscatter from objects immersed in a magnetized, finite, warm plasma column is addressed. In particular, the propagation, absorption, and backscatter of electron cyclotron waves are measured and compared with bounded vacuum hot plasma wave propagation, absorption, and ray tracing theory. The nonreciprocal nature of the transmission and absorption in an anisotropic plasma is measured. A homodyne technique which isolates the scattering from a single object in the plasma from the scattering from all other objects in the plasma and the walls of the containment device is developed and utilized. The range of absorption frequencies and nonreciprocity of the transmission signal are shown to be well correlated with wave trajectories in the associated regions of the Clemmow-Mullaly-Allis (CMA) diagram. It is shown that quasi-parallel propagation of electron cyclotron waves near resonance is present and that the transverse effects of wavenumber on propagation in the cylindrical plasma are small
The subject of broadband microwave propagation and absorption processes and backscatter from objects immersed in a magnetized, finite plasma column is addressed. The propagation, absorption, and backscatter of electron cyclotron waves from an object in a warm, magnetized plasma are measured and compared with bounded vacuum hot plasma wave propagation, absorption, and ray tracing theory. The nonreciprocal nature of the electron cyclotron wave transmission and absorption in an anisotropic plasma is measured. A homodyne technique which isolates the scattering from a single object in the plasma from the scattering from all other objects in the plasma and the walls of the containment device is developed and utilized. The range of absorption frequencies and nonreciprocity of the transmission signal are shown to be well correlated with wave trajectories in the associated regions of the Clemmow-Mullaly-Allis (CMA) diagram. It is shown by experimental measurement, ray tracing and analysis of a vacuum boundary plasma column that quasiparallel propagation of electron cyclotron waves near resonance is present and that the transverse wavenumber effects on propagation in the cylindrical plasma ((f[sub p]/f)[sup 2] [approx gt] 6, f/f[sub ce] [approx equal] 0.9) are small. An examination of cases in which damping occurs is shown to provide a stronger damping than WKB theory would predict, which is suggested by previous theoretical work. The experimental methods have a powerful potential for further basic plasma physics wave studies.
Broadband microwave propagation and absorption processes and backscatter from objects immersed in a magnetized, finite, warm plasma column is addressed. In particular, the propagation, absorption, and backscatter of electron cyclotron waves are measured and compared with bounded vacuum hot plasma wave propagation, absorption, and ray tracing theory. The nonreciprocal nature of the transmission and absorption in an anisotropic plasma is measured. A homodyne technique which isolates the scattering from a single object in the plasma from the scattering from all other objects in the plasma and the walls of the containment device is developed and utilized. The range of absorption frequencies and nonreciprocity of the transmission signal are shown to be well correlated with wave trajectories in the associated regions of the Clemmow-Mullaly-Allis (CMA) diagram. It is shown that quasi-parallel propagation of electron cyclotron waves near resonance is present and that the transverse effects of wavenumber on propagation in the cylindrical plasma are small.< >
Author Lam, N.T.
Zhang, Y.-S.
Chang, S.-F.R.
Bettenhausen, M.H.
Scharer, J.E.
Eldridge, O.C.
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Cites_doi 10.1103/PhysRevLett.31.14
10.1109/27.41211
10.1103/PhysRevLett.65.2011
10.1063/1.866177
10.1063/1.866893
10.1063/1.348829
10.1887/075030927X
10.1063/1.1694578
10.1088/0032-1028/19/5/003
10.1109/TPS.1986.4316491
10.1109/TPS.1985.4316355
10.1088/0032-1028/18/8/009
10.1063/1.865353
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Issue 3
Keywords Wave absorption
Helical antenna
Plasma column
Immersed body
Electron cyclotron wave
Wave propagation
Backscattering
Magnetoactive plasma
Ray tracing
Homodyne detection
Experimental study
Dipole antenna
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  doi: 10.1063/1.865353
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SubjectTerms 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700350 - Plasma Production, Heating, Current Drive, & Interactions- (1992-)
ABSORPTION
ANTENNAS
Backscatter
BACKSCATTERING
COMPARATIVE EVALUATIONS
CYCLOTRON RESONANCE
Cyclotrons
DAMPING
ELECTRICAL EQUIPMENT
Electromagnetic heating
ELECTROMAGNETIC RADIATION
Electromagnetic wave absorption
ELECTRON CYCLOTRON-RESONANCE
Electrons
EVALUATION
Exact sciences and technology
INHOMOGENEOUS PLASMA
Microwave propagation
MICROWAVE RADIATION
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
PLASMA
Plasma devices
Plasma measurements
Plasma waves
RADIATIONS
RESONANCE
SCATTERING
SORPTION
WAVE PROPAGATION
Waves, oscillations, and instabilities in plasmas and intense beams
Title Electron cyclotron wave propagation, absorption, and backscatter measurements in a laboratory plasma
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