Particle Flows in Pumped DIII-D Discharges

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The dynamics of particle flows in the DIII-D tokamak for two divertor configurations is considered. Fuel and intrinsic carbon impurity flows are analyzed using experimental data and 2D fluid plasma simulations. The flows in puff and pump experiments done in an open and a closed divertor geometry are described. It is shown that the flow of fuel particles is sensitive to divertor geometry. The pumping efficiency of the DIII-D cryopumps is a factor of 2 higher in a closed geometry than an open. The core refueling rate of an open divertor is a factor of 2 higher than that of ... continued below

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166 Kilobytes pages

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Porter, G.D.; Rognlien, T.D.; Rensink, M.E.; Wolf, N. & West, W.P. May 17, 2000.

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Description

The dynamics of particle flows in the DIII-D tokamak for two divertor configurations is considered. Fuel and intrinsic carbon impurity flows are analyzed using experimental data and 2D fluid plasma simulations. The flows in puff and pump experiments done in an open and a closed divertor geometry are described. It is shown that the flow of fuel particles is sensitive to divertor geometry. The pumping efficiency of the DIII-D cryopumps is a factor of 2 higher in a closed geometry than an open. The core refueling rate of an open divertor is a factor of 2 higher than that of a closed divertor. In contrast, the flow of impurity carbon particles is insensitive to divertor geometry. Both the core carbon content and the fraction of the carbon source which penetrates to the core is unchanged between an open and closed divertor. In addition, the core impurity content is found to be insensitive to the amplitude of gas puffing in the simulations.

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166 Kilobytes pages

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  • 14th International Conference on Plasma Surface Interactions (PSI), Rosenheim (DE), 05/22/2000--05/26/2000

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  • Report No.: UCRL-JC-136718
  • Grant Number: W-7405-Eng-48
  • Office of Scientific & Technical Information Report Number: 793991
  • Archival Resource Key: ark:/67531/metadc736297

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  • May 17, 2000

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  • Oct. 19, 2015, 7:39 p.m.

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  • May 6, 2016, 2:50 p.m.

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Porter, G.D.; Rognlien, T.D.; Rensink, M.E.; Wolf, N. & West, W.P. Particle Flows in Pumped DIII-D Discharges, article, May 17, 2000; California. (digital.library.unt.edu/ark:/67531/metadc736297/: accessed December 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.