Accession Number : AD0726986

Title :   A Theoretical and Experimental Investigation of Langmuir Probes in a Helium Discharge.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING

Personal Author(s) : Ekman,Willard J.

Report Date : MAR 1971

Pagination or Media Count : 56

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)

Descriptors :   (*GAS DISCHARGES, *LANGMUIR PROBES), ELECTRON DENSITY, PLASMA SHEATHS, PARTIAL DIFFERENTIAL EQUATIONS, INTEGRAL EQUATIONS, DISCHARGE TUBES, DISTRIBUTION FUNCTIONS, THESES

Subject Categories : Plasma Physics and Magnetohydrodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE