Spectroscopic Measurements of Impurities in the Upgraded DIVA Tokamak Plasma
1979
Detailed spectroscopic studies of impurities have been made on the hydrogen plasma in the wavelength region from 10 to 1300 A with the upgraded DIVA tokamak device with a divertor. The toroidal field is 20 kG and the peak plasma current is 40 kA. Oxygen is the dominant impurity with the density of about 2% of the electron density. The effective ionic charge estimated from the amount of low-Z impurities (oxygen and carbon) is 2.4 to 3 in agreement with the value derived from the plasma conductivity. The emission spectrum of many lines observed in the region from 42 to 200 A is due to gold as impurity. Its spatial distribution has a peaked profile at a shorter wavelength and a hollow profile at a longer wavelength. The radiation power losses due to low-Z impurities and gold are estimated to be 30–35 kW and 27 kW, respectively, and the total power loss corresponds to 41–44% of the Joule-input power.
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