Surface chemistry and physics of deuterium retention in lithiated graphite
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چکیده
Lithium wall conditioning in TFTR, CDX-U, T-11M, TJ-II and NSTX is found to yield enhanced plasma performance manifest, in part, through improved deuterium particle control. X-ray photoelectron spectroscopy (XPS) experiments examine the affect of D irradiation on lithiated graphite and show that the surface chemistry of lithiated graphite after D ion bombardment (500 eV/amu) is fundamentally different from that of non-Li conditioned graphite. Instead of simple LiD bonding seen in pure liquid Li, graphite introduces additional complexities. XPS spectra show that Li–O–D (533.0 ± 0.6 eV) and Li–C–D (291.4 ± 0.6 eV) bonds, for a nominal Li dose of 2 lm, become ‘‘saturated” with D at fluences between 3.8 and 5.2 10 cm . Atomistic modeling indicate that Li–O–D–C interactions may be a result of multibody effects as opposed to molecular bonding. 2010 Elsevier B.V. All rights reserved.
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تاریخ انتشار 2017