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- W1639821418 abstract "Two absolutely calibrated EUV instruments have been used to study the impurity characteristics in the Tandem Mirror Experiment-Upgrade (TMX-U). One instrument is a normal incidence spectrograph that measures the time histories of several impurity emission lines (300 to 1800 A) in a single shot; radial scans can be obtained on a shot-by-shot basis. The other instrument is a monochromator that measures time-resolved radial profiles of a given impurity emission line in a single shot. The common intrinsic impurities measured in TMX-U are C,N,O and Ti. It has been shown that large fractions of the oxygen and nitrogen in the plasma are associated with the neutral beams while the main source of carbon is the plasma wall. In general, the concentration of each of the impurities is low (<1%), and the power radiated by them is less than 10 kW, which is a small portion of the total input power to the plasma. The concentrations of the impurities can be reduced substantially blow discharge cleaning and titanium gettering. No significant accumulation of impurity ions in the thermal barrier region has been observed." @default.
- W1639821418 created "2016-06-24" @default.
- W1639821418 creator A5052832391 @default.
- W1639821418 date "1986-09-01" @default.
- W1639821418 modified "2023-09-25" @default.
- W1639821418 title "Spectroscopic analysis of low Z impurities in the Tandem Mirror Experiment-upgrade" @default.
- W1639821418 doi "https://doi.org/10.2172/5169331" @default.
- W1639821418 hasPublicationYear "1986" @default.
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