Microwave resonator probe for localized density measurements in weakly magnetized plasmas
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- R. L. Stenzel
- TRW Systems, Redondo Beach, California 90278
書誌事項
- 公開日
- 1976-05-01
- DOI
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- 10.1063/1.1134697
- 公開者
- AIP Publishing
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説明
<jats:p>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 ε=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(ε=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=7.45 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.</jats:p>
収録刊行物
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- Review of Scientific Instruments
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Review of Scientific Instruments 47 (5), 603-607, 1976-05-01
AIP Publishing