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Phys Rev Lett. 2013 Mar 8;110(10):105001. Epub 2013 Mar 4.

Deuterium uptake in magnetic-fusion devices with lithium-conditioned carbon walls.

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1
Joint Institute of Computational Sciences, University of Tennessee, Knoxville, Tennessee 37996-3460, USA.

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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