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Electron and ion sheath effects on a microwave 'hairpin' probe

Haas, F. A.; Al-Kuzee, J. and Braithwaite, N. St. J. (2005). Electron and ion sheath effects on a microwave 'hairpin' probe. Applied Physics Letters, 87(201503)

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1063/1.2131196
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Abstract

A microwave measurement of electron density in low-pressure plasmas can be based on a hairpin probe. The hairpin forms a transmission line that supports a quarter-wavelength standing wave. The resonance is related to the relative permittivity of the surroundings, and hence, in a plasma, electron density can be evaluated. For improved fidelity, a general model is developed to include the effects of positive and negative space-charge sheaths formed around the hairpin wires. The former tends to lower the resonance, whereas the latter tends to raise it initially. This is qualitatively in agreement with experiments in dc argon plasmas.

Item Type: Journal Article
Copyright Holders: 2005 American Institute of Physics
ISSN: 1077-3118
Keywords: plasma diagnostics; probes; low temperature plasmas
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
eSTEeM
Item ID: 2436
Depositing User: Tracey Moore
Date Deposited: 13 Jun 2006
Last Modified: 23 May 2014 09:20
URI: http://oro.open.ac.uk/id/eprint/2436
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