NDLI: Probes in non-uniform plasma

Content Provider	IEEE Xplore Digital Library
Author	Oksuz, L. Hershkowitz, N. Lho, T.
Copyright Year	2000
Description	Author affiliation: Dept. of Eng. Phys., Wisconsin Univ., Madison, WI, USA (Oksuz, L.)
Abstract	Mach probes and Langmuir probes are investigated experimentally in a non-uniform, unmagnetized plasma, drifting in a wall presheath. A Mach probe consists of two single sided Langmuir probes back to back with an insulator between them. Two different probe diameter sets 0.125" and 0.375", (smaller than the ion collision length /spl sim/3 cm at 1 mTorr) are used. The upstream side of the Mach probe (which faces the bulk plasma) indicated higher plasma potential than the local plasma potential in the absence of the probe. The plasma potential and density indicated by the upstream side of the Mach probe is almost the same plasma potential and density found an ion collision length (presheath length) from the probe. The downstream side of the Mach probe indicated lower plasma potential and density than the unperturbed local plasma potential and density. But the absolute value of the deviations from the local plasma potential and density were the same value for both sides of the Mach probe. The shadowing effect for the downstream side of the Mach probe is investigated when the probe is biased negatively and near the plasma potential. The potential and density profiles are also obtained by an emissive probe and a Langmuir probe near the upstream side and the downstream side of the Mach probe.
File Size	99692
File Format	PDF
ISBN	0780359828
ISSN	07309244
DOI	10.1109/PLASMA.2000.854986
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-06-04
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Probes Plasma density Plasma measurements Pulse measurements Plasma chemistry Pollution measurement Optical pulses Spatial resolution Fluorescence Dielectrics
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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