Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session CP11: Poster Session II: In-Person, Hall A (2:00-3:30pm) and Virtual Poster Presentations (3:45-5:00pm)
MFE: Low Aspect Ratio; Superconducting
FUND: Nonneutral, Antimatter, Strong coupled Plasmas; Waves
2:00 PM - 5:00 PM
Monday, October 17, 2022
Room: Exhibit Hall A and Online
Abstract: CP11.00028 : Investigating emissivity evolution of NSTX-U graphite and Li-coated stainless steel for IR thermography*
Presenter:
Promise O Adebayo-Ige
(University of Tennessee)
Authors:
Promise O Adebayo-Ige
(University of Tennessee)
Shota Abe
(Princeton Plasma Physics Laboratory)
Anurag Maan
(PPPL)
Kaifu Gan
(University of Tennessee)
Evan T Ostrowski
(Princeton University)
Jhovanna Garcia
(San Diego State University)
Richard Majeski
(Princeton Plasma Physics Laboratory)
Bruce E Koel
(Princeton University)
Rajesh Maingi
(Princeton Plasma Physics Laboratory)
Brian D Wirth
(University of Tennessee)
Infrared (IR) thermography is essential to measuring the spatial and temporal heat flux evolution in fusion tokamaks, as well as performing power balance studies. As a result, the emissivity of the plasma-facing components (PFCs) in any tokamak must be correctly characterized to guarantee accurate temperature measurements. The emissivity of W PFCs have been shown to evolve significantly [J. Gaspar et al., FED 149 (2019)] due to changes in surface roughness, plasma conditioning, and surface temperature. We present recently conducted experiments where we observe the emissivity evolution in Li-coated stainless steel, post-mortem NSTX-U ATJ graphite, and unexposed NSTX-U R6510 graphite. Both graphite and stainless steel samples underwent Li deposition in LTX-β. Samples were transferred in-vacuo utilizing the Sample Exposure Probe from LTX-β to the Sample Exposure Station for plasma conditioning and surface analysis. A Telops IR camera with a wavelength spectrum of 7.7-9.3 µm was used to analyze the emissivity of the heated samples in an ultra-high vacuum environment as a function of temperature. XPS and TPD were used to characterize the samples.
*Sponsored in part by U.S. DOE grant DOE DE-SC0008309 and contract DE-AC02-09CH11466.
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