Erosion/redeposition analysis : status of modeling and code validation for semi-detached tokamak edge plasmas.

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We are analyzing erosion and tritium codeposition for ITER, DIII-D, and other devices with a focus on carbon divertor and metallic wall sputtering, for detached and semi-detached edge plasmas. Carbon chemical-sputtering hydrocarbon-transport is computed in detail using upgraded models for sputtering yields, species, and atomic and molecular processes. For the DIII-D analysis this includes proton impact and dissociative recombination for the full methane and higher hydrocarbon chains. Several mixed material (Si-C doping and Be/C) effects on erosion are examined. A semi-detached reactor plasma regime yields peak net wall erosion rates of {approximately}1.0 (Be), {approximately}0.3 (Fe), and {approximately}0.01 (W) cm/burn-yr, and ... continued below

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27 p.

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Brooks, J. N. January 19, 1999.

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Description

We are analyzing erosion and tritium codeposition for ITER, DIII-D, and other devices with a focus on carbon divertor and metallic wall sputtering, for detached and semi-detached edge plasmas. Carbon chemical-sputtering hydrocarbon-transport is computed in detail using upgraded models for sputtering yields, species, and atomic and molecular processes. For the DIII-D analysis this includes proton impact and dissociative recombination for the full methane and higher hydrocarbon chains. Several mixed material (Si-C doping and Be/C) effects on erosion are examined. A semi-detached reactor plasma regime yields peak net wall erosion rates of {approximately}1.0 (Be), {approximately}0.3 (Fe), and {approximately}0.01 (W) cm/burn-yr, and {approximately}50 cm/burn-yr for a carbon divertor. Net carbon erosion is dominated by chemical sputtering in the {approximately}1-3 eV detached plasma zone. Tritium codeposition in divertor-sputtered redeposited carbon is high ({approximately}10-20 g-T/1000 s ). Silicon and beryllium mixing tends to reduce carbon erosion. Initial hydrocarbon transport calculations for the DIII-D DiMES-73 detached plasma experiment show a broad spectrum of redeposited molecules with {approximately}90% redeposition fraction.

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27 p.

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INIS; OSTI as DE00010811

Medium: P; Size: 27 pages

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  • 13th PSI Conference, San Diego, CA (US), 05/18/1998--05/22/1998

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  • Report No.: ANL/TD/CP-96490
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 10811
  • Archival Resource Key: ark:/67531/metadc625970

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  • January 19, 1999

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  • June 16, 2015, 7:43 a.m.

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  • April 10, 2017, 6:39 p.m.

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Brooks, J. N. Erosion/redeposition analysis : status of modeling and code validation for semi-detached tokamak edge plasmas., article, January 19, 1999; Illinois. (digital.library.unt.edu/ark:/67531/metadc625970/: accessed October 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.