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Langmuir probe plasma diagnostics to investigate the dielectric properties of cryogenic gas mixtures
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Langmuir probe plasma diagnostics to investigate the dielectric properties of cryogenic gas mixtures
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Journal Article
Langmuir probe plasma diagnostics to investigate the dielectric properties of cryogenic gas mixtures
2017
Overview
Use of the Langmuir probe plasma diagnostics to investigate the dielectric properties of gas mixtures is discussed as a continuation our previous experimental and theoretical work on understanding the dielectric strength of helium gas mixtures for superconducting and other cryogenic applications. Here we report the results of Langmuir probe experiments conducted on the gas mixtures to obtain plasma parameters including plasma density and the electron temperature. The experimental procedure used in the Langmuir probe plasma measurements, the derivation of the plasma characteristic parameters, and the implications of the results to the dielectric characteristics are discussed. The plasma characteristics obtained under various discharge power, gas pressure, and gas composition are also discussed. The results support the findings of the our previous theoretical and experimental studies that showed substantial enhancement of dielectric strength of He gas obtained by the addition of small mol% of H2 and relate the enhancements to the plasma characteristics observed.
Publisher
IOP Publishing
