Impurity studies and discharge cleaning in Doublet III

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The goal of present and next generation tokamak experiments is to produce high-density, high-purity plasmas during high-power, extended-duration discharges. Plasma discharges with Z/sub eff/ values near unity and low concentrations of medium and high-Z metallic impurities have been obtained in Doublet III using a combination of low-power hydrogen discharge cleaning, gas puffing, precise plasma shape and position control, and high-Z limiters. Analysis of the first wall surface and residual gas impurities confirmed that clean conditions have been achieved. The high-Z limiters showed very limited amounts of melting or arcing. The progress of the wall cleaning process was monitored by three ... continued below

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Pages: 26

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Marcus, F.B. October 1, 1979.

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Description

The goal of present and next generation tokamak experiments is to produce high-density, high-purity plasmas during high-power, extended-duration discharges. Plasma discharges with Z/sub eff/ values near unity and low concentrations of medium and high-Z metallic impurities have been obtained in Doublet III using a combination of low-power hydrogen discharge cleaning, gas puffing, precise plasma shape and position control, and high-Z limiters. Analysis of the first wall surface and residual gas impurities confirmed that clean conditions have been achieved. The high-Z limiters showed very limited amounts of melting or arcing. The progress of the wall cleaning process was monitored by three diagnostic techniques: Auger electron spectroscopy of metallic samples at the vessel wall, residual gas analysis, and the resistivity of full power discharges.

Physical Description

Pages: 26

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Dep. NTIS, PC A03/MF A01.

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  • IAEA technical committee meeting on impurities in tokamaks: source, effect, and control, Alushta, USSR, 8 Oct 1979

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  • Report No.: GA-A-15613
  • Report No.: CONF-7910124-1
  • Grant Number: AT03-76ET51011
  • Office of Scientific & Technical Information Report Number: 5610497
  • Archival Resource Key: ark:/67531/metadc1093763

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • October 1, 1979

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

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  • March 29, 2018, 1 p.m.

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Marcus, F.B. Impurity studies and discharge cleaning in Doublet III, article, October 1, 1979; United States. (digital.library.unt.edu/ark:/67531/metadc1093763/: accessed October 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.