3D modeling of boron transport in DIII-D L-mode wall conditioning experiments

F. Effenberg; A. Bortolon; H. Frerichs; B. Grierson; J. D. Lore; T. Abrams; T. E. Evans; Y. Feng; R. Lunsford; R. Maingi; A. Nagy; R. Nazikian; D. Orlov; J. Ren; D. L. Rudakov; W. R. Wampler; H. Q. Wang

doi:10.1016/j.nme.2021.100900

3D modeling of boron transport in DIII-D L-mode wall conditioning experiments

F. Effenberg, A. Bortolon, H. Frerichs, B. Grierson, J. D. Lore, T. Abrams, T. E. Evans, Y. Feng, R. Lunsford, R. Maingi, A. Nagy, R. Nazikian, D. Orlov, J. Ren, D. L. Rudakov, W. R. Wampler, H. Q. Wang

Power Exhaust and Particle Control

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

15 Scopus citations

Abstract

DIII-D L-mode experiments with local boron powder injection for real-time wall conditioning have been interpreted for the first time with the 3D plasma edge transport Monte Carlo code EMC3-EIRENE. Local B sourcing in plasma scenarios with upstream densities 1.5⋅10¹⁹ m⁻³ and 2.2 MW heating results in a non-axisymmetric B distribution in the scrape-off layer (SOL) and on the divertor. The SOL frictional flows at high plasma density cause a strong inboard drag of injected impurities (≈90%), while lower background plasma densities tend to result in a more uniform distribution. The thermal forces prevent B deposition in the near SOL while the frictional force causes B fluxes to cover the divertor plasma-facing components in a region 7–10 cm beyond the strike line. Radiative dissipation occurs for B influxes above 1⋅10²⁰ s⁻¹ and causes a moderate, non-axisymmetric reduction of the far SOL divertor heat fluxes. A comparison of top and midplane B injection shows no substantial difference in inboard vs. outboard asymmetries of the B distribution. On the other hand, erosion or recycling at the strike line may distribute the boron more uniformly in the SOL.

Original language	English
Article number	100900
Journal	Nuclear Materials and Energy
Volume	26
DOIs	https://doi.org/10.1016/j.nme.2021.100900
State	Published - Mar 2021

Funding

This work was supported by the United States Department of Energy (DoE) under Grants No. DE-AC02-09CH11466 , DE-AC05-00OR22725 , DE-SC0020357 , DE-SC0020284 , DE-FC02-04ER54698 , DE-FG02-07ER54917 , DE-NA0003525 , and DE-SC0019256 . This work was supported by the United States Department of Energy (DoE) under Grants No. DE-AC02-09CH11466, DE-AC05-00OR22725, DE-SC0020357, DE-SC0020284, DE-FC02-04ER54698, DE-FG02-07ER54917, DE-NA0003525, and DE-SC0019256. 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.

Keywords

Boronization
EMC3-EIRENE
Impurity flows
Impurity seeding
Wall conditioning

UN SDGs

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

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Effenberg, F., Bortolon, A., Frerichs, H., Grierson, B., Lore, J. D., Abrams, T., Evans, T. E., Feng, Y., Lunsford, R., Maingi, R., Nagy, A., Nazikian, R., Orlov, D., Ren, J., Rudakov, D. L., Wampler, W. R., & Wang, H. Q. (2021). 3D modeling of boron transport in DIII-D L-mode wall conditioning experiments. Nuclear Materials and Energy, 26, Article 100900. https://doi.org/10.1016/j.nme.2021.100900

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title = "3D modeling of boron transport in DIII-D L-mode wall conditioning experiments",

abstract = "DIII-D L-mode experiments with local boron powder injection for real-time wall conditioning have been interpreted for the first time with the 3D plasma edge transport Monte Carlo code EMC3-EIRENE. Local B sourcing in plasma scenarios with upstream densities 1.5⋅1019 m−3 and 2.2 MW heating results in a non-axisymmetric B distribution in the scrape-off layer (SOL) and on the divertor. The SOL frictional flows at high plasma density cause a strong inboard drag of injected impurities (≈90%), while lower background plasma densities tend to result in a more uniform distribution. The thermal forces prevent B deposition in the near SOL while the frictional force causes B fluxes to cover the divertor plasma-facing components in a region 7–10 cm beyond the strike line. Radiative dissipation occurs for B influxes above 1⋅1020 s−1 and causes a moderate, non-axisymmetric reduction of the far SOL divertor heat fluxes. A comparison of top and midplane B injection shows no substantial difference in inboard vs. outboard asymmetries of the B distribution. On the other hand, erosion or recycling at the strike line may distribute the boron more uniformly in the SOL.",

keywords = "Boronization, EMC3-EIRENE, Impurity flows, Impurity seeding, Wall conditioning",

author = "F. Effenberg and A. Bortolon and H. Frerichs and B. Grierson and Lore, {J. D.} and T. Abrams and Evans, {T. E.} and Y. Feng and R. Lunsford and R. Maingi and A. Nagy and R. Nazikian and D. Orlov and J. Ren and Rudakov, {D. L.} and Wampler, {W. R.} and Wang, {H. Q.}",

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doi = "10.1016/j.nme.2021.100900",

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T1 - 3D modeling of boron transport in DIII-D L-mode wall conditioning experiments

AU - Effenberg, F.

AU - Bortolon, A.

AU - Frerichs, H.

AU - Grierson, B.

AU - Lore, J. D.

AU - Abrams, T.

AU - Evans, T. E.

AU - Feng, Y.

AU - Lunsford, R.

AU - Maingi, R.

AU - Nagy, A.

AU - Nazikian, R.

AU - Orlov, D.

AU - Ren, J.

AU - Rudakov, D. L.

AU - Wampler, W. R.

AU - Wang, H. Q.

PY - 2021/3

Y1 - 2021/3

N2 - DIII-D L-mode experiments with local boron powder injection for real-time wall conditioning have been interpreted for the first time with the 3D plasma edge transport Monte Carlo code EMC3-EIRENE. Local B sourcing in plasma scenarios with upstream densities 1.5⋅1019 m−3 and 2.2 MW heating results in a non-axisymmetric B distribution in the scrape-off layer (SOL) and on the divertor. The SOL frictional flows at high plasma density cause a strong inboard drag of injected impurities (≈90%), while lower background plasma densities tend to result in a more uniform distribution. The thermal forces prevent B deposition in the near SOL while the frictional force causes B fluxes to cover the divertor plasma-facing components in a region 7–10 cm beyond the strike line. Radiative dissipation occurs for B influxes above 1⋅1020 s−1 and causes a moderate, non-axisymmetric reduction of the far SOL divertor heat fluxes. A comparison of top and midplane B injection shows no substantial difference in inboard vs. outboard asymmetries of the B distribution. On the other hand, erosion or recycling at the strike line may distribute the boron more uniformly in the SOL.

AB - DIII-D L-mode experiments with local boron powder injection for real-time wall conditioning have been interpreted for the first time with the 3D plasma edge transport Monte Carlo code EMC3-EIRENE. Local B sourcing in plasma scenarios with upstream densities 1.5⋅1019 m−3 and 2.2 MW heating results in a non-axisymmetric B distribution in the scrape-off layer (SOL) and on the divertor. The SOL frictional flows at high plasma density cause a strong inboard drag of injected impurities (≈90%), while lower background plasma densities tend to result in a more uniform distribution. The thermal forces prevent B deposition in the near SOL while the frictional force causes B fluxes to cover the divertor plasma-facing components in a region 7–10 cm beyond the strike line. Radiative dissipation occurs for B influxes above 1⋅1020 s−1 and causes a moderate, non-axisymmetric reduction of the far SOL divertor heat fluxes. A comparison of top and midplane B injection shows no substantial difference in inboard vs. outboard asymmetries of the B distribution. On the other hand, erosion or recycling at the strike line may distribute the boron more uniformly in the SOL.

KW - Boronization

KW - EMC3-EIRENE

KW - Impurity flows

KW - Impurity seeding

KW - Wall conditioning

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DO - 10.1016/j.nme.2021.100900

M3 - Article

AN - SCOPUS:85099182007

SN - 2352-1791

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JO - Nuclear Materials and Energy

JF - Nuclear Materials and Energy

M1 - 100900

ER -

3D modeling of boron transport in DIII-D L-mode wall conditioning experiments

Abstract

Funding

Keywords

UN SDGs

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