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Accession Number ADA570716
Title Improved Analysis Techniques for Cylindrical and Spherical Double Probes (Preprint).
Publication Date Mar 2012
Media Count 10p
Personal Author B. Beal D. Bromaghim D. Brown J. Blakely L. Johnson
Abstract A versatile double Langmuir probe technique has been developed by incorporating analytical fits to Laframboise's numerical results for ion current collection by biased electrodes of various sizes relative to the local electron Debye length. Application of these fits to the double probe circuit has produced a set of coupled equations that express the potential of each electrode relative to the plasma potential as well as the resulting probe current as a function of applied probe voltage. These equations can be readily solved via standard numerical techniques in order to infer electron temperature and plasma density from experimental data. Because this method self- consistently accounts for the effects of sheath expansion, it can be readily applied to low-temperature plasmas with a wide range of densities without a priori tailoring of probe dimensions to the expected electron Debye length. The presented approach has been successfully applied to experimental measurements obtained in the plume of a low-power Hall thruster.
Keywords Circuits
Cylindrical bodies
Electron energy
Experimental data
Hall thrusters
Ionic current
Langmuir probes
Low power
Numerical methods and procedures

Source Agency Non Paid ADAS
NTIS Subject Category 94K - Laboratory & Test Facility Design & Operation
46G - Plasma Physics
Corporate Author Air Force Research Lab., Edwards AFB, CA. Propulsion Directorate West.
Document Type Journal article
Title Note Journal article preprint.
NTIS Issue Number 1315
Contract Number N/A

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