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Initial studies of plasma facing component surface conditioning in the national spherical tokamak experiment upgrade with the materials analysis particle probe

Author(s): Bedoya, F.; Allain, J.P.; Kaita, R.; Skinner, C.H.; Koel, Bruce E.; et al

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dc.contributor.authorBedoya, F.-
dc.contributor.authorAllain, J.P.-
dc.contributor.authorKaita, R.-
dc.contributor.authorSkinner, C.H.-
dc.contributor.authorKoel, Bruce E.-
dc.contributor.authorScotti, F.-
dc.date.accessioned2020-01-30T21:54:06Z-
dc.date.available2020-01-30T21:54:06Z-
dc.date.issued2017-03-29en_US
dc.identifier.citationBedoya, F, Allain, JP, Kaita, R, Skinner, CH, Koel, BE, Scotti, F. (2017). Initial studies of plasma facing component surface conditioning in the national spherical tokamak experiment upgrade with the materials analysis particle probe. Nuclear Materials and Energy, 12 (1248 - 1252). doi:10.1016/j.nme.2017.03.035en_US
dc.identifier.urihttp://arks.princeton.edu/ark:/88435/pr1pb42-
dc.description.abstractAn innovative PFC diagnostic, the Materials Analysis Particle Probe (MAPP) was used to study the chemistry of Plasma Facing Components (PFCs) in the National Spherical Tokamak Experiment Upgrade (NSTX-U). NSTX-U used boronization as conditioning strategy during the 2015–2016 experimental campaign. Deposition with ∼9.1 g of deuterated tri-methyl boron (d-TMB) in a helium glow discharge resulted in coatings with an equivalent thickness of 7.0 nm at the lower outer divertor region. MAPP was used to capture for the first time the in-vacuo evolution of the chemical state of ATJ graphite PFCs after boronization and plasma exposure via X-ray Photoelectron Spectroscopy (XPS) on a day-to-day basis. The XPS data shows the formation of B 4 C on the PFCs surface during boronization. We observed the gradual increase of the B 2 O 3 fraction in the coatings with plasma exposures. In contrast, we measured the formation of non-stoichiometric oxides when the samples were only exposed to residual gases and an argon vent. MAPP data revealed erosion and oxidation of deposited boron coatings over the course of tens of shots (a time resolution improved several orders-of-magnitude compared to post-campaign PFC characterization) that is correlated with the transitory nature of plasma performance enhancement with boron conditioning.en_US
dc.format.extent1248 - 1252en_US
dc.language.isoen_USen_US
dc.relation.ispartofNuclear Materials and Energyen_US
dc.rightsFinal published version. This is an open access article.en_US
dc.titleInitial studies of plasma facing component surface conditioning in the national spherical tokamak experiment upgrade with the materials analysis particle probeen_US
dc.typeJournal Articleen_US
dc.identifier.doidoi:10.1016/j.nme.2017.03.035-
dc.date.eissued2017en_US
pu.type.symplectichttp://www.symplectic.co.uk/publications/atom-terms/1.0/journal-articleen_US

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