Tungsten erosion and divertor leakage from the DIII-D SAS-VW tungsten-coated divertor in experiments with neon gas seeding

Matthew S. Parsons; Jeremy D. Mateja; Seth H. Messer; Tyler Abrams; Jean Paul Allain; Alessandro Bortolon; Patrick Byrne; David C. Donovan; Florian Effenberg; Jeffrey L. Herfindal; Florian Laggner; Tomas Odstrcil; Jun Ren; Dmitry L. Rudakov; Gregory Sinclair; Robert S. Wilcox

doi:10.1016/j.nme.2023.101520

Tungsten erosion and divertor leakage from the DIII-D SAS-VW tungsten-coated divertor in experiments with neon gas seeding

Matthew S. Parsons, Jeremy D. Mateja, Seth H. Messer, Tyler Abrams, Jean Paul Allain, Alessandro Bortolon, Patrick Byrne, David C. Donovan, Florian Effenberg, Jeffrey L. Herfindal, Florian Laggner, Tomas Odstrcil, Jun Ren, Dmitry L. Rudakov, Gregory Sinclair, Robert S. Wilcox

Advanced Tokamak Physics

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

Collector probes have been used to examine tungsten divertor leakage in a variety of scenarios with low-Z impurity seeding during operation with the new tungsten-coated SAS-VW divertor in DIII-D. Measurements of tungsten deposition on collector probes inserted into the far Scrape-off-Layer (SOL) are used to deduce how efficiently tungsten leaks out of the closed, V-shaped divertor after it is eroded from the target surfaces. Qualitative differences in the tungsten deposition patterns across the collector probes provide clear experimental evidence that the SOL conditions depend on the low-Z impurity seeding conditions. These measurements show that in scenarios where neon gas is injected into the plasma, the tungsten divertor leakage and SOL transport depend on the poloidal location from which the neon is injected. In particular, neon injection from the Inner Midplane and Outer Midplane appear to each result in higher divertor leakage by a factor of 2 to 3 compared to cases with neon injection from either the SOL Crown or from the SAS-VW divertor itself.

Original language	English
Article number	101520
Journal	Nuclear Materials and Energy
Volume	37
DOIs	https://doi.org/10.1016/j.nme.2023.101520
State	Published - Dec 2023

Funding

This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences , using the DIII-D National Fusion Facility, a DOE Office of Science user facility, under Awards DE- FC02-04ER54698 , DE-SC0020093 , DE-SC0019256 , DE-AC02-09CH11466 , DE-FG02-07ER54917 , DE-AC05-00OR22725 . Disclaimer: This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. The authors would like to thank Ivo Carvalho and Al Hyatt for the insights they shared while serving as physics operators for the experiment on DIII-D. This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences, using the DIII-D National Fusion Facility, a DOE Office of Science user facility, under Awards DE-FC02-04ER54698, DE-SC0020093, DE-SC0019256, DE-AC02-09CH11466, DE-FG02-07ER54917, DE-AC05-00OR22725. Disclaimer: This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.

Funders	Funder number
DOE Office of Science user facility	DE-FC02-04ER54698
United States Government
U.S. Department of Energy
Office of Science	DE-AC05-00OR22725, DE-SC0019256, DE- FC02-04ER54698, DE-SC0020093, DE-AC02-09CH11466, DE-FG02-07ER54917
Fusion Energy Sciences

Keywords

Collector probes
Neon seeding
Tungsten divertor leakage
Tungsten erosion

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.nme.2023.101520

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Parsons, M. S., Mateja, J. D., Messer, S. H., Abrams, T., Allain, J. P., Bortolon, A., Byrne, P., Donovan, D. C., Effenberg, F., Herfindal, J. L., Laggner, F., Odstrcil, T., Ren, J., Rudakov, D. L., Sinclair, G., & Wilcox, R. S. (2023). Tungsten erosion and divertor leakage from the DIII-D SAS-VW tungsten-coated divertor in experiments with neon gas seeding. Nuclear Materials and Energy, 37, Article 101520. https://doi.org/10.1016/j.nme.2023.101520

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title = "Tungsten erosion and divertor leakage from the DIII-D SAS-VW tungsten-coated divertor in experiments with neon gas seeding",

abstract = "Collector probes have been used to examine tungsten divertor leakage in a variety of scenarios with low-Z impurity seeding during operation with the new tungsten-coated SAS-VW divertor in DIII-D. Measurements of tungsten deposition on collector probes inserted into the far Scrape-off-Layer (SOL) are used to deduce how efficiently tungsten leaks out of the closed, V-shaped divertor after it is eroded from the target surfaces. Qualitative differences in the tungsten deposition patterns across the collector probes provide clear experimental evidence that the SOL conditions depend on the low-Z impurity seeding conditions. These measurements show that in scenarios where neon gas is injected into the plasma, the tungsten divertor leakage and SOL transport depend on the poloidal location from which the neon is injected. In particular, neon injection from the Inner Midplane and Outer Midplane appear to each result in higher divertor leakage by a factor of 2 to 3 compared to cases with neon injection from either the SOL Crown or from the SAS-VW divertor itself.",

keywords = "Collector probes, Neon seeding, Tungsten divertor leakage, Tungsten erosion",

author = "Parsons, {Matthew S.} and Mateja, {Jeremy D.} and Messer, {Seth H.} and Tyler Abrams and Allain, {Jean Paul} and Alessandro Bortolon and Patrick Byrne and Donovan, {David C.} and Florian Effenberg and Herfindal, {Jeffrey L.} and Florian Laggner and Tomas Odstrcil and Jun Ren and Rudakov, {Dmitry L.} and Gregory Sinclair and Wilcox, {Robert S.}",

note = "Publisher Copyright: {\textcopyright} 2023 The Authors",

year = "2023",

month = dec,

doi = "10.1016/j.nme.2023.101520",

language = "English",

volume = "37",

journal = "Nuclear Materials and Energy",

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Parsons, MS, Mateja, JD, Messer, SH, Abrams, T, Allain, JP, Bortolon, A, Byrne, P, Donovan, DC, Effenberg, F, Herfindal, JL, Laggner, F, Odstrcil, T, Ren, J, Rudakov, DL, Sinclair, G & Wilcox, RS 2023, 'Tungsten erosion and divertor leakage from the DIII-D SAS-VW tungsten-coated divertor in experiments with neon gas seeding', Nuclear Materials and Energy, vol. 37, 101520. https://doi.org/10.1016/j.nme.2023.101520

TY - JOUR

T1 - Tungsten erosion and divertor leakage from the DIII-D SAS-VW tungsten-coated divertor in experiments with neon gas seeding

AU - Parsons, Matthew S.

AU - Mateja, Jeremy D.

AU - Messer, Seth H.

AU - Abrams, Tyler

AU - Allain, Jean Paul

AU - Bortolon, Alessandro

AU - Byrne, Patrick

AU - Donovan, David C.

AU - Effenberg, Florian

AU - Herfindal, Jeffrey L.

AU - Laggner, Florian

AU - Odstrcil, Tomas

AU - Ren, Jun

AU - Rudakov, Dmitry L.

AU - Sinclair, Gregory

AU - Wilcox, Robert S.

PY - 2023/12

Y1 - 2023/12

N2 - Collector probes have been used to examine tungsten divertor leakage in a variety of scenarios with low-Z impurity seeding during operation with the new tungsten-coated SAS-VW divertor in DIII-D. Measurements of tungsten deposition on collector probes inserted into the far Scrape-off-Layer (SOL) are used to deduce how efficiently tungsten leaks out of the closed, V-shaped divertor after it is eroded from the target surfaces. Qualitative differences in the tungsten deposition patterns across the collector probes provide clear experimental evidence that the SOL conditions depend on the low-Z impurity seeding conditions. These measurements show that in scenarios where neon gas is injected into the plasma, the tungsten divertor leakage and SOL transport depend on the poloidal location from which the neon is injected. In particular, neon injection from the Inner Midplane and Outer Midplane appear to each result in higher divertor leakage by a factor of 2 to 3 compared to cases with neon injection from either the SOL Crown or from the SAS-VW divertor itself.

AB - Collector probes have been used to examine tungsten divertor leakage in a variety of scenarios with low-Z impurity seeding during operation with the new tungsten-coated SAS-VW divertor in DIII-D. Measurements of tungsten deposition on collector probes inserted into the far Scrape-off-Layer (SOL) are used to deduce how efficiently tungsten leaks out of the closed, V-shaped divertor after it is eroded from the target surfaces. Qualitative differences in the tungsten deposition patterns across the collector probes provide clear experimental evidence that the SOL conditions depend on the low-Z impurity seeding conditions. These measurements show that in scenarios where neon gas is injected into the plasma, the tungsten divertor leakage and SOL transport depend on the poloidal location from which the neon is injected. In particular, neon injection from the Inner Midplane and Outer Midplane appear to each result in higher divertor leakage by a factor of 2 to 3 compared to cases with neon injection from either the SOL Crown or from the SAS-VW divertor itself.

KW - Collector probes

KW - Neon seeding

KW - Tungsten divertor leakage

KW - Tungsten erosion

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DO - 10.1016/j.nme.2023.101520

M3 - Article

AN - SCOPUS:85172480062

SN - 2352-1791

VL - 37

JO - Nuclear Materials and Energy

JF - Nuclear Materials and Energy

M1 - 101520

ER -

Tungsten erosion and divertor leakage from the DIII-D SAS-VW tungsten-coated divertor in experiments with neon gas seeding

Abstract

Funding

Keywords

UN SDGs

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