title: Unraveling wall conditioning effects on plasma facing components in NSTX-U with the Materials Analysis Particle Probe (MAPP).
abstract: A novel Plasma Facing Components (PFCs) diagnostic, the Materials Analysis Particle Probe (MAPP), has been recently commissioned in the National Spherical Torus Experiment Upgrade (NSTX-U). MAPP is currently monitoring the chemical evolution of the PFCs in the NSTX-U lower divertor at 107 cm from the tokamak axis on a day-to-day basis. In this work, we summarize the methodology that was adopted to obtain qualitative and quantitative descriptions of the samples chemistry. Using this methodology, we were able to describe all the features in all our spectra to within a standard deviation of ±0.22 eV in position and ±248 s-1eV in area. Additionally, we provide an example of this methodology with data of boronized ATJ graphite exposed to NSTX-U plasmas.
authors.affiliation: Department of Nuclear, Plasma and Radiological Engineering, University of Illinois, Urbana, Illinois 61801, USA.
authors.forename: F
authors.initials: F
authors.lastname: Bedoya
authors.affiliation: Department of Nuclear, Plasma and Radiological Engineering, University of Illinois, Urbana, Illinois 61801, USA.
authors.forename: J P
authors.initials: JP
authors.lastname: Allain
authors.affiliation: Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
authors.forename: R
authors.initials: R
authors.lastname: Kaita
authors.affiliation: Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
authors.forename: C H
authors.initials: CH
authors.lastname: Skinner
authors.affiliation: Department of Chemical and Biological Engineering, Princeton University, Princeton, New Jersey 08540, USA.
authors.forename: L
authors.initials: L
authors.lastname: Buzi
authors.affiliation: Department of Chemical and Biological Engineering, Princeton University, Princeton, New Jersey 08540, USA.
authors.forename: B E
authors.initials: BE
authors.lastname: Koel