Deuterium Uptake in Magnetic-Fusion Devices with Lithium-Conditioned Carbon Walls

P. S. Krstic, J. P. Allain, C. N. Taylor, J. Dadras, S. Maeda, K. Morokuma, J. Jakowski, A. Allouche, and C. H. Skinner
Phys. Rev. Lett. 110, 105001 – Published 4 March 2013

Abstract

Lithium wall conditioning has lowered hydrogenic recycling and dramatically improved plasma performance in many magnetic-fusion devices. In this Letter, we report quantum-classical atomistic simulations and laboratory experiments that elucidate the roles of lithium and oxygen in the uptake of hydrogen in amorphous carbon. Surprisingly, we show that lithium creates a high oxygen concentration on a carbon surface when bombarded by deuterium. Furthermore, surface oxygen, rather than lithium, plays the key role in trapping hydrogen.

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  • Received 7 December 2012

DOI:https://doi.org/10.1103/PhysRevLett.110.105001

© 2013 American Physical Society

Authors & Affiliations

P. S. Krstic*

  • Joint Institute of Computational Sciences, University of Tennessee, Knoxville, Tennessee 37996-3460, USA; Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1200, USA; and Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6372, USA

J. P. Allain

  • School of Nuclear Engineering, Purdue University, West Lafayette, Indiana, USA and Birck Nanotechnology Center, West Lafayette, Indiana 47907, USA

C. N. Taylor

  • School of Nuclear Engineering, Purdue University, West Lafayette, Indiana 47907, USA and Fusion Safety Program, Idaho National Laboratory, Idaho Falls, Idaho 83415, USA

J. Dadras

  • Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1200, USA
  • Department of Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, California 90095-1569, USA

S. Maeda and K. Morokuma

  • Fukui Institute for Fundamental Chemistry, Kyoto University, Kyoto 606 8103, Japan

J. Jakowski

  • National Institute for Computational Sciences, University of Tennessee, Oak Ridge, Tennessee 37831-6173, USA

A. Allouche

  • PIIM, CNRS, and Aix-Marseille University, 13397 Marseille cedex 20, France

C. H. Skinner

  • Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA

  • *pkrstic@utk.edu

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Vol. 110, Iss. 10 — 8 March 2013

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