title: Deuterium uptake in magnetic-fusion devices with lithium-conditioned carbon walls.
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.
authors.affiliation: Joint Institute of Computational Sciences, University of Tennessee, Knoxville, Tennessee 37996-3460, USA.
authors.forename: P S
authors.initials: PS
authors.lastname: Krstic
authors.forename: J P
authors.initials: JP
authors.lastname: Allain
authors.forename: C N
authors.initials: CN
authors.lastname: Taylor
authors.forename: J
authors.initials: J
authors.lastname: Dadras
authors.forename: S
authors.initials: S
authors.lastname: Maeda
authors.forename: K
authors.initials: K
authors.lastname: Morokuma
authors.forename: J
authors.initials: J
authors.lastname: Jakowski
authors.forename: A
authors.initials: A
authors.lastname: Allouche
authors.forename: C H
authors.initials: CH
authors.lastname: Skinner