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

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⋅1019m−3 and 2.2 MW heating results in...

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Main Authors: 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
Format: Article
Language:English
Published: Elsevier 2021-03-01
Series:Nuclear Materials and Energy
Subjects:
Online Access:http://www.sciencedirect.com/science/article/pii/S2352179121000016
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author 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
author_facet 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
author_sort F. Effenberg
collection DOAJ
description 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⋅1019m−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⋅1020s−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.
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spelling doaj.art-4cd9713e1c064682a98a9df4ac5d73382022-12-21T19:41:57ZengElsevierNuclear Materials and Energy2352-17912021-03-01261009003D modeling of boron transport in DIII-D L-mode wall conditioning experimentsF. Effenberg0A. Bortolon1H. Frerichs2B. Grierson3J.D. Lore4T. Abrams5T.E. Evans6Y. Feng7R. Lunsford8R. Maingi9A. Nagy10R. Nazikian11D. Orlov12J. Ren13D.L. Rudakov14W.R. Wampler15H.Q. Wang16Princeton Plasma Physics Laboratory, Princeton, NJ 08543, USA; Corresponding author.Princeton Plasma Physics Laboratory, Princeton, NJ 08543, USAUniversity of Wisconsin - Madison, Madison, WI 53706, USAPrinceton Plasma Physics Laboratory, Princeton, NJ 08543, USAOak Ridge National Laboratory, Oak Ridge, TN 37831, USAGeneral Atomics, San Diego, CA 92186, USAGeneral Atomics, San Diego, CA 92186, USAMax-Planck-Institut für Plasmaphysik, Association EURATOM IPP, 17491 Greifswald, GermanyPrinceton Plasma Physics Laboratory, Princeton, NJ 08543, USAPrinceton Plasma Physics Laboratory, Princeton, NJ 08543, USAPrinceton Plasma Physics Laboratory, Princeton, NJ 08543, USAPrinceton Plasma Physics Laboratory, Princeton, NJ 08543, USAUniversity of California - San Diego, La Jolla, CA 92093, USAUniversity of Tennessee, Knoxville, Knoxville, TN 37996, USAUniversity of California - San Diego, La Jolla, CA 92093, USASandia National Laboratories, Albuquerque, NM 87111, USAGeneral Atomics, San Diego, CA 92186, USADIII-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⋅1019m−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⋅1020s−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.http://www.sciencedirect.com/science/article/pii/S2352179121000016Wall conditioningBoronizationImpurity seedingImpurity flowsEMC3-EIRENE
spellingShingle 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
3D modeling of boron transport in DIII-D L-mode wall conditioning experiments
Nuclear Materials and Energy
Wall conditioning
Boronization
Impurity seeding
Impurity flows
EMC3-EIRENE
title 3D modeling of boron transport in DIII-D L-mode wall conditioning experiments
title_full 3D modeling of boron transport in DIII-D L-mode wall conditioning experiments
title_fullStr 3D modeling of boron transport in DIII-D L-mode wall conditioning experiments
title_full_unstemmed 3D modeling of boron transport in DIII-D L-mode wall conditioning experiments
title_short 3D modeling of boron transport in DIII-D L-mode wall conditioning experiments
title_sort 3d modeling of boron transport in diii d l mode wall conditioning experiments
topic Wall conditioning
Boronization
Impurity seeding
Impurity flows
EMC3-EIRENE
url http://www.sciencedirect.com/science/article/pii/S2352179121000016
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