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 in | IEEE transactions on plasma science Vol. 21; no. 3; pp. 271 - 281 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
New York, NY
IEEE
01.06.1993
Institute of Electrical and Electronics Engineers |
Subjects | |
Online Access | Get full text |
ISSN | 0093-3813 1939-9375 |
DOI | 10.1109/27.277552 |
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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.< > |
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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. |
Author_xml | – sequence: 1 givenname: J.E. surname: Scharer fullname: Scharer, J.E. organization: Wisconsin Univ., Madison, WI, USA – sequence: 2 givenname: O.C. surname: Eldridge fullname: Eldridge, O.C. organization: Wisconsin Univ., Madison, WI, USA – sequence: 3 givenname: S.-F.R. surname: Chang fullname: Chang, S.-F.R. organization: Wisconsin Univ., Madison, WI, USA – sequence: 4 givenname: Y.-S. surname: Zhang fullname: Zhang, Y.-S. organization: Wisconsin Univ., Madison, WI, USA – sequence: 5 givenname: M.H. surname: Bettenhausen fullname: Bettenhausen, M.H. organization: Wisconsin Univ., Madison, WI, USA – sequence: 6 givenname: N.T. surname: Lam fullname: Lam, N.T. organization: Wisconsin Univ., Madison, WI, USA |
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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 |
Language | English |
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References | ref13 bettenhausen (ref12) 1990; 35 ref15 stutzman (ref9) 1981 ref2 ref1 pozar (ref11) 1990 ref16 ref19 ref18 mcvey (ref17) 1984 ref8 ref7 stix (ref14) 1992 ref4 ref3 king (ref10) 1978 ref6 ref5 |
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Snippet | Broadband microwave propagation and absorption processes and backscatter from objects immersed in a magnetized, finite, warm plasma column is addressed. In... The subject of broadband microwave propagation and absorption processes and backscatter from objects immersed in a magnetized, finite plasma column is... |
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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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