13C surface characterization of midplane and crown collector probes on DIII-D

J. D. Duran; D. C. Donovan; J. H. Nichols; E. A. Unterberg; S. A. Zamperini; T. Abrams; R. Perillo; J. Ren; D. L. Rudakov; M. W. Shafer; P. C. Stangeby; D. A. Taussig; R. S. Wilcox; M. P. Zach

doi:10.1016/j.nme.2022.101339

¹³C surface characterization of midplane and crown collector probes on DIII-D

J. D. Duran, D. C. Donovan, J. H. Nichols, E. A. Unterberg, S. A. Zamperini, T. Abrams, R. Perillo, J. Ren, D. L. Rudakov, M. W. Shafer, P. C. Stangeby, D. A. Taussig, R. S. Wilcox, M. P. Zach

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

3 Scopus citations

Abstract

A dual collector probe system has been implemented on DIII-D for scrape-off-layer (SOL) impurity transport studies. These experiments injected isotopically enriched methane (¹³CD₄) and sampled the impurities from this extrinsic, primary source with graphite collector probes at the outboard midplane and crown of upper single null L-mode plasmas. Using a stable isotopic mixing model, results suggest that ¹³C from methane injections prior to these experiments has built up on the walls of DIII-D to act as a secondary, intrinsic source of enriched ¹³C to the collector probes. This secondary source accounts for nearly 60 % of the deposits on the midplane collector probes and nearly 90 % of the deposition on the collector probes in the crown. These results lay the foundation for future impurity transport models and suggest that further simulation of impurity transport during the methane injection experiments will require two sources of enriched impurities in order to accurately model the SOL impurity profiles of ¹³C.

Original language	English
Article number	101339
Journal	Nuclear Materials and Energy
Volume	34
DOIs	https://doi.org/10.1016/j.nme.2022.101339
State	Published - Mar 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 Award(s) DE-SC0019256 (UTK), DE-AC05-00OR22725 (ORNL), DE-FG02-07ER54917 (UCSD), DE-FC02-04ER54698 (DIII-D). 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. 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 Award(s) DE-SC0019256 (UTK), DE-AC05-00OR22725 (ORNL), DE-FG02-07ER54917 (UCSD), DE-FC02-04ER54698 (DIII-D).

Keywords

Collector probe
Fusion
Impurity
Isotopes
Tokamak
Transport

UN SDGs

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

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10.1016/j.nme.2022.101339

Cite this

Duran, J. D., Donovan, D. C., Nichols, J. H., Unterberg, E. A., Zamperini, S. A., Abrams, T., Perillo, R., Ren, J., Rudakov, D. L., Shafer, M. W., Stangeby, P. C., Taussig, D. A., Wilcox, R. S., & Zach, M. P. (2023). ¹³C surface characterization of midplane and crown collector probes on DIII-D. Nuclear Materials and Energy, 34, Article 101339. https://doi.org/10.1016/j.nme.2022.101339

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abstract = "A dual collector probe system has been implemented on DIII-D for scrape-off-layer (SOL) impurity transport studies. These experiments injected isotopically enriched methane (13CD4) and sampled the impurities from this extrinsic, primary source with graphite collector probes at the outboard midplane and crown of upper single null L-mode plasmas. Using a stable isotopic mixing model, results suggest that 13C from methane injections prior to these experiments has built up on the walls of DIII-D to act as a secondary, intrinsic source of enriched 13C to the collector probes. This secondary source accounts for nearly 60 % of the deposits on the midplane collector probes and nearly 90 % of the deposition on the collector probes in the crown. These results lay the foundation for future impurity transport models and suggest that further simulation of impurity transport during the methane injection experiments will require two sources of enriched impurities in order to accurately model the SOL impurity profiles of 13C.",

keywords = "Collector probe, Fusion, Impurity, Isotopes, Tokamak, Transport",

author = "Duran, {J. D.} and Donovan, {D. C.} and Nichols, {J. H.} and Unterberg, {E. A.} and Zamperini, {S. A.} and T. Abrams and R. Perillo and J. Ren and Rudakov, {D. L.} and Shafer, {M. W.} and Stangeby, {P. C.} and Taussig, {D. A.} and Wilcox, {R. S.} and Zach, {M. P.}",

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year = "2023",

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doi = "10.1016/j.nme.2022.101339",

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AU - Donovan, D. C.

AU - Nichols, J. H.

AU - Unterberg, E. A.

AU - Zamperini, S. A.

AU - Abrams, T.

AU - Perillo, R.

AU - Ren, J.

AU - Rudakov, D. L.

AU - Shafer, M. W.

AU - Stangeby, P. C.

AU - Taussig, D. A.

AU - Wilcox, R. S.

AU - Zach, M. P.

PY - 2023/3

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AB - A dual collector probe system has been implemented on DIII-D for scrape-off-layer (SOL) impurity transport studies. These experiments injected isotopically enriched methane (13CD4) and sampled the impurities from this extrinsic, primary source with graphite collector probes at the outboard midplane and crown of upper single null L-mode plasmas. Using a stable isotopic mixing model, results suggest that 13C from methane injections prior to these experiments has built up on the walls of DIII-D to act as a secondary, intrinsic source of enriched 13C to the collector probes. This secondary source accounts for nearly 60 % of the deposits on the midplane collector probes and nearly 90 % of the deposition on the collector probes in the crown. These results lay the foundation for future impurity transport models and suggest that further simulation of impurity transport during the methane injection experiments will require two sources of enriched impurities in order to accurately model the SOL impurity profiles of 13C.

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