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Monopole Antenna Probe for Density Measurements in Cold Plasmas
- Source :
- Plasma Science and Technology. 13:197-200
- Publication Year :
- 2011
- Publisher :
- IOP Publishing, 2011.
-
Abstract
- A simple diagnostic tool for density measurements in plasma with a certain spatial resolution is proposed in this paper. It uses the emission characteristics of monopole antenna to determine the dielectic property of plasma = 1 − fp2/f2, with the fp 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 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.
Details
- ISSN :
- 10090630
- Volume :
- 13
- Database :
- OpenAIRE
- Journal :
- Plasma Science and Technology
- Accession number :
- edsair.doi...........2f984679e89ab0253e0b45ae2492ad81