A Theoretical and Experimental Investigation of Langmuir Probes in a Helium Discharge.
Abstract
The Langmuir probe theories of Self and Shih, Waymouth, and Kiel for collisional plasmas are examined theoretically. A probe theory for a collision dominated plasma with a collision dominated probe sheath is presented. Spherical probe measurements were made in a hot cathode helium discharge at 0.3 and 0.4 Torr. Good agreement on the ion densities between the Self and Shih method and a method suggested by Medicus was obtained. The Medicus method gave better agreement with second derivative techniques on the determination of plasma potential than the Self and Shih method. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1971
- Accession Number
- AD0726986
Entities
People
- Willard J. Ekman
Organizations
- Air Force Institute of Technology