Plasma Diffusion in a Space-Simulation Beam-Plasma Discharge.
NAVAL RESEARCH LAB WASHINGTON D C
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Electron density and temperature profiles have been measured in a large-facility beam-plasma-dischargeV sub B 1.3 KeV, I sub B 63 ma at low pressure P 2-410 to the -6th powerTorr and low magnetic fields B 1.2 G. The results follow an exponential behavior and are found to be in good agreement with a simple diffusion model. The favorable comparison between theory and experiment yields the first estimate of cross-field electron diffusion perpendicular diffusion coefficientnom 2.2 million sq cmsec under conditions intended to simulate Spacelab-borne beam-plasma investigations. This value for perpendicular diffusion coefficient is orders of magnitude larger than would be expected for a cross-field collisional diffusion process, a result which is identified with the turbulent state of collective beam-plasma interactions.
- Plasma Physics and Magnetohydrodynamics