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A molecular dynamics study of diamond exposed to tritium bombardment for fusion applications

Dunn, AR; Duffy, DM; Stoneham, AM; (2011) A molecular dynamics study of diamond exposed to tritium bombardment for fusion applications. In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. (pp. 1724 - 1726). Elsevier Science BV Green open access

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Abstract

Diamond, with its low atomic number and high thermal conductivity, is being assessed as a possible plasma facing material within a fusion reactor. Molecular dynamics simulations using the AIREBO potential were performed simulating the exposure of diamond to a plasma in conditions similar to those of the divertor region of a tokamak. Diamond surfaces at temperatures of 300 and 600 K were bombarded with 15 eV tritium at a high flux (10(29) ions m(-2) s(-1)). A layer-by-layer etching process was observed which, with the lack of any tritium diffusion though the remaining diamond structure, was responsible for limiting damage, and thus tritium retention, to the top 4-5 diamond layers. Analysis of this damaged region also showed a large amount of residual structure suggesting that bombardment below the physical sputtering threshold (similar to 30 eV) may not lead to amorphisation of the surface. (C) 2010 Elsevier B.V. All rights reserved.

Type: Proceedings paper
Title: A molecular dynamics study of diamond exposed to tritium bombardment for fusion applications
Event: 10th International Conference on Computer Simulation of Radiation Effects in Solids
Location: Jagiellonian Univ, Krakow, POLAND
Dates: 2010-07-19 - 2010-07-23
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.nimb.2010.12.009
Publisher version: http://dx.doi.org/10.1016/j.nimb.2010.12.009
Language: English
Additional information: Text made available to UCL Discovery by kind permission of Elsevier B.V., 2012
Keywords: Diamond, Tritium, Fusion, Divertor, Plasma facing material, High flux, SIMULATIONS
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1319963
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