Impurity Status of Dee-Shaped Discharges in Doublet III with Inconel Wall and Limiters; with and Without Titanium Gettering. Doublet III Experimental Report, 5

摘要

Dee-shaped discharges in the Doublet III device have the following plasma parameters: maximum discharge current 1.0 MA, maximum mean density 1.0 x 10 exp 14 cm exp -3 , elongation 1.0 - 1.6. The dominant impurities are oxygen and nickel, which are the major constituents of the Inconel limiters and vessel wall. Discharges with Z sub(eff) = 1 - 3 are attained without titanium gettering. Lower density and/or higher current discharges are characterized by a large influx of nickel impurity. During some conditions, impurity accumulations near the center are observed. (Atomindex citation 12:623594)