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MERCURY ARC PLASMA TUBE,
HARRY DIAMOND LABS WASHINGTON D C
A general description of a cylindrical, low-pressure mercury arc plasma tube, 51 cm high and 60 cm across, is given. The tube is operated at 15 v dc and may be continuously evacuated by a 6-in mercury diffusion pump. Controlled electron densities of 10 to the 17th power to 10 to the 19th powercu.m. are achieved by adjusting the current from 50 to 2500 amp. The tube was designed for studying interactions between plasma and immersed microwave antenna array systems, and for other studies in which a relatively extensive plasma is desirable. Author