Preliminary Langmuir Probe Study of Argon Plasma in a Hollow, Hot Oxide Cathode Using Second Derivative Diagnostic Techniques.
Abstract
A plasma facility was constructed to perform a preliminary study of argon plasma with a movable Langmuir probe inside a hot oxide cathode using second derivative diagnostic techniques. The discharge conditions were: pressure about 0.248 Torr, constant discharge current about 430 milliamps, and heater current about 5.9 amperes. Plasma measurements were taken radially and profiles of the temperature and number density of low-energy electrons and the potential distribution obtained. Strong variations in number density with variations in plasma potential were found. The electron spectrum consisted of three distinct energy groups with the bulk of plasma ions being produced by direct ionization. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1969
- Accession Number
- AD0855123
Entities
People
- Harold S. Hughes
Organizations
- Air Force Institute of Technology