Two-resonance probe for measuring electron density in low-pressure plasmas

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A technique for measuring double-checked electron density using two types of microwave resonance is presented. Simultaneous measurement of the resonances (plasma and quarter-wavelength resonator resonances), which were used for the cutoff probe (CP) and hairpin probe (HP), was achieved by the proposed microwave resonance probe. The developed two-resonance probe (TRP) consists of parallel separated coaxial cables exposing the radiation and detection tips. The structure resembles that of the CP, except the gapped coaxial cables operate not only as a microwave feeder for the CP but also as a U-shaped quarter-wavelength resonator for the HP. By virtue of this structure, the microwave resonances that have typically been used for measuring the electron density for the CP and HP were clearly identified on the microwave transmission spectrum of the TRP. The two types of resonances were measured experimentally under various power and pressure conditions for the plasma. A three-dimensional full-wave simulation model for the TRP is also presented and used to investigate and reproduce the resonances. The electron densities inferred from the resonances were compared and showed good agreement. Quantitative differences between the densities were attributed to the effects of the sheath width and spatial density gradient on the resonances. This accessible technique of using the TRP to obtain double-checked electron densities may be useful for comparative study and provides complementary uses for the CP and
Publisher
IOP PUBLISHING LTD
Issue Date
2017-04
Language
English
Article Type
Article
Keywords

WAVE CUTOFF METHOD; HAIRPIN RESONATOR

Citation

PLASMA SOURCES SCIENCE & TECHNOLOGY, v.26, no.4

ISSN
0963-0252
DOI
10.1088/1361-6595/aa5fe7
URI
http://hdl.handle.net/10203/223791
Appears in Collection
ME-Journal Papers(저널논문)
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