Journal Article10.1063/1.1134697
Microwave resonator probe for localized density measurements in weakly magnetized plasmas
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TL;DR: In this article, a simple diagnostic tool for performing spatially resolved density measurements in a large, weakly magnetized, low-temperature plasma is described based on a microwave technique to determine the cold plasma dielectric property e = 1−ωp2/ω2, where ωp is the electron plasma frequency.
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Abstract: A simple diagnostic tool for performing spatially resolved density measurements in a large, weakly magnetized, low‐temperature plasma is described The principle is based on a microwave technique to determine the cold plasma dielectric property e=1−ωp2/ω2, where ωp is the electron plasma frequency A parallel‐wire quarter‐wavelength resonator is immersed into the plasma, the resonance frequency (ωres≳ωp) is measured and the density derived from the simple relation ωp2=ω2res−ω2res(e=1) In contrast to the familiar cavity resonance shift method, the present method is suited for localized density measurements The spatial resolution is comparable to the size of the resonator (2‐mm width×8 mm length, fres=745 GHz) The microwave technique is largely independent of sheath and thermal effects and is thus more reliable than probe measurements in nonuniformly rf‐heated magnetoplasmas A comparison with independent density diagnostic tools is presented and additional applications are pointed out
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Citations
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TL;DR: A floating hairpin resonance probe has been used for the first time to measure the spatial and time evolution of local electron density in a laser-produced plasma expanding in vacuum as mentioned in this paper, and the measured variation in electron density agrees closely with the variation of ion charge density as measured with a time-of-flight planar Langmuir ion probe.
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Density irregularities, currents, and magnetic fields generated by pulsed local rf heating of a magnetoplasma: Disturbances in rf antenna vicinity
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Whistler excitation by short current pulses in a magnetoplasma
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TL;DR: In this paper, a large-volume laboratory plasma is filled with Whistler waves launched from an electric dipole of length L in a large volume laboratory plasma, and the radiation pattern narrows and forms a duct of diameter approximately equal to L. The observed nonlinear effects are explained by waveparticle interactions.
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Filamentation of large amplitude whistler waves
TL;DR: In this paper, a filamentation instability of large amplitude whistler waves is observed in a laboratory experiment and it is predicted that similar nonlinear effects may arise in the ionosphere in connection with the planned high power whistler wave experiments of the AMPS mission.
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