
Accession Number : AD0263449
Title : TRANSVERSE DIFFUSION IN A QUASISTATIC POSITIVE COLUMN
Corporate Author : BOEING SCIENTIFIC RESEARCH LABS SEATTLE WASH
Personal Author(s) : JOHNSON,ROY R. ; JERDE,DAVID A.
Report Date : SEP 1961
Pagination or Media Count : 1
Abstract : The transverse diffusion of a diverging positive column in a slowly varying magnetic field is measured experimentally, and compared with the corresponding steadystate theory. The theory is developed from the macroscopic equations for momentum and particle conservation, taking into account only charged particleneutral atom collisions. Reasonable agreement is found between theory and experiment for discharge currents in Helium of the order of 50  500 ma, pressures of 0.6 to 1.0 mm Hg, and peak magnetic fields of up to 15 kilogauss. Rise times of the magnetic field are between 1 and 8 kilogauss/m sec. Unstable behavior of the current is observed only after the peak magnetic field is reached, even though the peak values are greater than the critical values observed by Lehnert (Phys. of fluids 3:600, 1960) and Allen et al (Phys. Rev. Hr. 5:409, 1960) for the onset of enhanced diffusion. (Author)
Descriptors : *DIFFUSION, *MAGNETIC FIELDS, *PARTICLES, DISCHARGE TUBES, ELECTRIC DISCHARGES, HELIUM, INTEGRAL EQUATIONS, KINETIC THEORY, MATHEMATICAL ANALYSIS, PLASMAS(PHYSICS)
Distribution Statement : APPROVED FOR PUBLIC RELEASE