Simulations of carbon sputtering in fusion reactor divertor plates

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The interaction of edge plasma with material surfaces raises key issues for the viability of the International Thermonuclear Reactor (ITER) and future fusion reactors, including heat-flux limits, net material erosion, and impurity production. After exposure of the graphite divertor plate to the plasma in a fusion device, an amorphous C/H layer forms. This layer contains 20-30 atomic percent D/T bonded to C. Subsequent D/T impingement on this layer produces a variety of hydrocarbons that are sputtered back into the sheath region. We present molecular dynamics (MD) simulations of D/T impacts on amorphous carbon layer as a function of ion energy ... continued below

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PDF-file: 13 pages; size: 0.3 Mbytes

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Marian, J; Zepeda-Ruiz, L A; Gilmer, G H; Bringa, E M & Rognlien, T October 3, 2005.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 12 times . More information about this article can be viewed below.

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The interaction of edge plasma with material surfaces raises key issues for the viability of the International Thermonuclear Reactor (ITER) and future fusion reactors, including heat-flux limits, net material erosion, and impurity production. After exposure of the graphite divertor plate to the plasma in a fusion device, an amorphous C/H layer forms. This layer contains 20-30 atomic percent D/T bonded to C. Subsequent D/T impingement on this layer produces a variety of hydrocarbons that are sputtered back into the sheath region. We present molecular dynamics (MD) simulations of D/T impacts on amorphous carbon layer as a function of ion energy and orientation, using the AIREBO potential. In particular, energies are varied between 10 and 150 eV to transition from chemical to physical sputtering. These results are used to quantify yield, hydrocarbon composition and eventual plasma contamination.

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PDF-file: 13 pages; size: 0.3 Mbytes

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  • Presented at: PSIF, Oak Ridge, TN, United States, Mar 07 - Mar 11, 2005

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  • Report No.: UCRL-CONF-215875
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 883579
  • Archival Resource Key: ark:/67531/metadc891513

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Office of Scientific & Technical Information Technical Reports

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  • October 3, 2005

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  • Sept. 23, 2016, 2:42 p.m.

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  • Dec. 7, 2016, 9:20 p.m.

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Marian, J; Zepeda-Ruiz, L A; Gilmer, G H; Bringa, E M & Rognlien, T. Simulations of carbon sputtering in fusion reactor divertor plates, article, October 3, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc891513/: accessed January 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.