Transport of tungsten to collector probes in DIII-D

Zamperini, Shawn A.; Donovan, David C.; Unterberg, Ezekial; Stangeby, Peter; Nichols, Jacob H.; Duran, Jonah D.; Elder, D.; Neff, Anton; Rudakov, D. L.; Zach, Mike

doi:10.1016/j.nme.2018.12.013

Title: Transport of tungsten to collector probes in DIII-D

Journal Article · 12 December 2018 · Nuclear Materials and Energy

DOI: https://doi.org/10.1016/j.nme.2018.12.013 · OSTI ID:1530109

^[1]; Donovan, David C. ^[1];

^[2]; Stangeby, Peter ^[3]; Nichols, Jacob H. ^[1];

^[1];

^[3]; Neff, Anton ^[2]; Rudakov, D. L. ^[4];

^[2]

Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Toronto Inst. for Aerospace Studies (UTIAS), Toronto, ON (Canada)
Univ. of California, San Diego (UCSD), San Diego, CA (United State)

Collector probes have long been used to measure impurity fluxes in the scrape off layer (SOL) of tokamaks. In this study, collector probes were inserted in the main SOL of DIII-D during the tungsten Metal Rings Campaign, and the W deposits on the probes were analyzed ex situ using Rutherford backscattering spectrometry analysis to obtain radial profiles of W deposition. A simple picture is hypothesized for how the W transports through the SOL from the target to the two sides of the probe, based on a long-theorized impurity accumulation at the crown (i.e. the top) of the plasma. The patterns observed in the deposition profiles along the probes support the hypothesized picture; however, 3D modeling and further experimental studies are needed to support more definitive conclusions.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC05-00OR22725; SC0019256

OSTI ID:: 1530109

Journal Information:: Nuclear Materials and Energy, Journal Name: Nuclear Materials and Energy Journal Issue: C Vol. 18; ISSN 2352-1791

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited By (2)

Multiple Analytical Approach to Isotopic Transport Analysis in Magnetic Fusion Devices Duran, Jonah D.; Unterberg, Ezekial A.; Zach, Mike P. Fusion Science and Technology, Vol. 75, Issue 6 https://doi.org/10.1080/15361055.2019.1610316	journal	May 2019
Localized divertor leakage measurements using isotopic tungsten sources during edge-localized mode-y H-mode discharges on DIII-D Unterberg, E. A.; Abrams, T.; Bykov, I. Nuclear Fusion, Vol. 60, Issue 1 https://doi.org/10.1088/1741-4326/ab537b	journal	November 2019

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