Migration of Artificially Introduced Micron Size Carbon Dust in the DIII-D Divertor

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Migration of pre-characterized carbon dust in a tokamak environment was studied by introducing about 30 milligrams of dust flakes 5-10 {micro}m in diameter in the lower divertor of DIII-D using the DiMES sample holder. The dust was exposed to high power ELMing Hmode discharges in lower-single-null magnetic configuration with the strike points swept across the divertor floor. When the outer strike point (OSP) passed over the dust holder exposing it to high particle and heat fluxes, part of the dust was injected into the plasma. In about 0.1 sec following the OSP pass over the dust, 1-2% of the total ... continued below

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PDF-file: 15 pages; size: 0.5 Mbytes

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Rudakov, D; West, W; Wong, C; Brooks, N; Evans, T; Fenstermacher, M et al. May 15, 2006.

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Migration of pre-characterized carbon dust in a tokamak environment was studied by introducing about 30 milligrams of dust flakes 5-10 {micro}m in diameter in the lower divertor of DIII-D using the DiMES sample holder. The dust was exposed to high power ELMing Hmode discharges in lower-single-null magnetic configuration with the strike points swept across the divertor floor. When the outer strike point (OSP) passed over the dust holder exposing it to high particle and heat fluxes, part of the dust was injected into the plasma. In about 0.1 sec following the OSP pass over the dust, 1-2% of the total dust carbon content (2-4 x 10{sup 19} carbon atoms, equivalent to a few million dust particles) penetrated the core plasma, raising the core carbon density by a factor of 2-3. When the OSP was inboard of the dust holder, the dust injection continued at a lower rate. Individual dust particles were observed moving at velocities of 10-100 m/s, predominantly in the toroidal direction for deuteron flow to the outer divertor target, consistent with the ion drag force. The observed behavior of the dust is in qualitative agreement with modeling by the 3D DustT code.

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PDF-file: 15 pages; size: 0.5 Mbytes

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  • Journal Name: Journal of Nuclear Materials, vol. 363-365, n/a, June 15, 2007, pp. 227-232; Journal Volume: 363-365

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  • Report No.: UCRL-JRNL-221419
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 940152
  • Archival Resource Key: ark:/67531/metadc895381

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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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  • May 15, 2006

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 9, 2016, 6:40 p.m.

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Rudakov, D; West, W; Wong, C; Brooks, N; Evans, T; Fenstermacher, M et al. Migration of Artificially Introduced Micron Size Carbon Dust in the DIII-D Divertor, article, May 15, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc895381/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.