DiMES Studies of Temperature Dependence of Carbon Erosion and Re-Deposition in the DIII-D Divertor

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A strong effect of a moderately elevated surface temperature on net carbon deposition and deuterium co-deposition in the DIII-D divertor was observed under detached conditions. A DiMES sample with a gap 2 mm wide and 18 mm deep was exposed to lower-single-null (LSN) L-mode plasmas first at room temperature, and then at 200 C. At the elevated temperature, deuterium co-deposition in the gap was reduced by an order of magnitude. At the plasma-facing surface of the heated sample net carbon erosion was measured at a rate of 3 nm/s, whereas without heating net deposition is normally observed under detachment. In ... continued below

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Rudakov, D L; Jacob, W; Krieger, K; Litnovsky, A; Philipps, V; West, W P et al. March 15, 2007.

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A strong effect of a moderately elevated surface temperature on net carbon deposition and deuterium co-deposition in the DIII-D divertor was observed under detached conditions. A DiMES sample with a gap 2 mm wide and 18 mm deep was exposed to lower-single-null (LSN) L-mode plasmas first at room temperature, and then at 200 C. At the elevated temperature, deuterium co-deposition in the gap was reduced by an order of magnitude. At the plasma-facing surface of the heated sample net carbon erosion was measured at a rate of 3 nm/s, whereas without heating net deposition is normally observed under detachment. In a related experiment three sets of molybdenum mirrors recessed 2 cm below the divertor floor were exposed to identical LSN ELMy H-mode discharges. The first set of mirrors exposed at ambient temperature exhibited net carbon deposition at a rate of up to 3.7 nm/s and suffered a significant drop in reflectivity. In contrast, two other mirror sets exposed at elevated temperatures between 90 C and 175 C exhibited practically no carbon deposition.

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PDF-file: 18 pages; size: 0.2 Mbytes

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  • Journal Name: Physica Scripta, T128, N/A, March 28, 2007, pp. 29-34; Journal Volume: T128

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  • Report No.: UCRL-JRNL-229141
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 940469
  • Archival Resource Key: ark:/67531/metadc899622

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  • March 15, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 23, 2016, 3:59 p.m.

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Rudakov, D L; Jacob, W; Krieger, K; Litnovsky, A; Philipps, V; West, W P et al. DiMES Studies of Temperature Dependence of Carbon Erosion and Re-Deposition in the DIII-D Divertor, article, March 15, 2007; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc899622/: accessed June 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.