Electron cyclotron discharge cleaning (ECDC) experiments on Alcator C-Mod

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Experiments were performed on Alcator C-Mod with Electron Cyclotron resonance plasmas to help determine their applicability to a fusion reactor. Strong radial inhomogeneity of the plasma density was measured, decreasing by a factor of ten a few centimeters inside the resonance location, but remaining approximately constant (n{sub e} {approx} 10{sup 16} m{sup {minus}3}) outside the resonance location. Electron and ion temperatures remained mostly constant outside the resonance location ({Tau}{sub e} {approx} 10eV, {Tau}{sub i} {approx} 2eV). Toroidal asymmetries in ion saturation current density were observed, indicating local toroidal plasma flow. The ECR plasma was used to remove a diamond-like carbon ... continued below

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11 p.

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Nachtrieb, R.T.; LaBombard, B.L.; Terry, J.L.; Reardon, J.C.; Rowan, W.L. & Wampler, W.R. May 1, 1998.

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Experiments were performed on Alcator C-Mod with Electron Cyclotron resonance plasmas to help determine their applicability to a fusion reactor. Strong radial inhomogeneity of the plasma density was measured, decreasing by a factor of ten a few centimeters inside the resonance location, but remaining approximately constant (n{sub e} {approx} 10{sup 16} m{sup {minus}3}) outside the resonance location. Electron and ion temperatures remained mostly constant outside the resonance location ({Tau}{sub e} {approx} 10eV, {Tau}{sub i} {approx} 2eV). Toroidal asymmetries in ion saturation current density were observed, indicating local toroidal plasma flow. The ECR plasma was used to remove a diamond-like carbon coating from a stainless-steel sample. Removal rates peaked at 4.2 {+-} 0.4 nm/hour with the sample a few centimeters outside the resonance location. Removal rates decreased inside and further outside the resonance location. The plasma did not remove the carbon from the sample uniformly, possibly due to plasma flow. Yields were calculated (Y {approx}10{sup {minus}3}) to be lower than other published results for chemical sputtering of deuterium ions on carbon, possibly due to toroidally asymmetric plasma conditions. Significant redeposition was not observed.

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11 p.

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INIS; OSTI as DE98005504

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  • 13. international conference on plasma surface interactions, San Diego, CA (United States), 18-22 May 1998

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  • Other: DE98005504
  • Report No.: SAND--98-1237C
  • Report No.: CONF-980560--
  • Grant Number: AC02-78ET51013;AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 658413
  • Archival Resource Key: ark:/67531/metadc709415

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  • May 1, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • April 14, 2016, 9:37 p.m.

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Nachtrieb, R.T.; LaBombard, B.L.; Terry, J.L.; Reardon, J.C.; Rowan, W.L. & Wampler, W.R. Electron cyclotron discharge cleaning (ECDC) experiments on Alcator C-Mod, article, May 1, 1998; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc709415/: accessed August 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.