Monopole Antenna Probe for Density Measurements in Cold Plasmas

WANG Huihui; LI Hong; WANG Yuhou; LI Bin; YOU Wei; CHEN Zhipeng; XIE Jinlin; LIU Wandong

Plasma Science and Technology > 2011 > 13(2): 197-200.

WANG Huihui, LI Hong, WANG Yuhou, LI Bin, YOU Wei, CHEN Zhipeng, XIE Jinlin, LIU Wandong. Monopole Antenna Probe for Density Measurements in Cold Plasmas[J]. Plasma Science and Technology, 2011, 13(2): 197-200.

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Monopole Antenna Probe for Density Measurements in Cold Plasmas

CAS Key Laboratory of Basic Plasma Physics, Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China

Funds: supported by National Natural Science Foundation of China (Nos. 10705028, 10835009) and National Basic Research Program of China (No. 2008CB717800).

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Abstract

Abstract

A simple diagnostic tool for density measurements in plasma with a certain spatial resolution is proposed in the this paper. It uses the emission characteristics of monopole antenna to determine the dielectic property of plasma ε=1-ƒ_p²/ƒ², with ƒ_pthe electron plasma frequency related to plasma density. We immersed a monopole antenna probe into plasma and introduced a microwave signal via a network analyzer. When the emitted power is maximized, the reflected power is minimized and there occurs a resonance. Since ε can be derived from the resonant frequency, this is actually a method to measure the absolute electron density. Validated by a comparison with the amended Langmuir double-probe method, the monopole antenna probe is valuable. In addition, it is free from the difficulties, such as fluctuation in plasma potential.
- electron density,
- monopole antenna probe,
- Langmuir double probe,
- relative permittivity,
- resonance frequency

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