Modeling the effect of nitrogen recycling on the erosion and leakage of tungsten impurities from the SAS-VW divertor in DIII-D during nitrogen gas injection
Abstract
The new SAS-VW divertor in DIII-D has tungsten-coated components to enable the study of tungsten erosion and leakage from a closed, slot-like divertor. A proposed method of actively managing the tungsten impurities is to inject low-Z impurities, such as nitrogen, into the Scrape-off-Layer (SOL) to modify the conditions in the plasma boundary and in turn manipulate both the erosion and subsequent transport of tungsten. Nitrogen injection from the SOL crown has been modeled using SOLPS-ITER to calculate the background plasma including the intrinsic carbon and the injected nitrogen impurities, and subsequently DIVIMP has been used to calculate the tungsten erosion and transport on top of the background plasma solution. This workflow has been used to model scenarios at a variety of nitrogen injection rates with different assumptions about the nitrogen recycling at the target. In the scenario modeled here, an optimal nitrogen injection rate around 3-4 x 1020 N/s is found to reduce the amount of tungsten reaching the core by a factor of about 2.4. However, when the nitrogen recycling rate at the divertor targets is high, the nitrogen redistributes within the slot leading to increased tungsten sputtering, and the range of injection rates resulting in tungsten mitigation becomesmore »
- Authors:
-
[1];
[2];
[2]
- Pennsylvania State Univ., University Park, PA (United States)
- General Atomics, San Diego, CA (United States)
- Publication Date:
- Research Org.:
- General Atomics, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1895115
- Grant/Contract Number:
- FC02-04ER54698; SC0020093
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Materials and Energy
- Additional Journal Information:
- Journal Volume: 33; Journal ID: ISSN 2352-1791
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Tungsten divertor Leakage; Tungsten mitigation; Nitrogen gas injection; Closed divertor; SAS-VW divertor
Citation Formats
Parsons, Matthew S., Sinclair, Gregory, and Abrams, Tyler. Modeling the effect of nitrogen recycling on the erosion and leakage of tungsten impurities from the SAS-VW divertor in DIII-D during nitrogen gas injection. United States: N. p., 2022.
Web. doi:10.1016/j.nme.2022.101254.
Parsons, Matthew S., Sinclair, Gregory, & Abrams, Tyler. Modeling the effect of nitrogen recycling on the erosion and leakage of tungsten impurities from the SAS-VW divertor in DIII-D during nitrogen gas injection. United States. https://doi.org/10.1016/j.nme.2022.101254
Parsons, Matthew S., Sinclair, Gregory, and Abrams, Tyler. Tue .
"Modeling the effect of nitrogen recycling on the erosion and leakage of tungsten impurities from the SAS-VW divertor in DIII-D during nitrogen gas injection". United States. https://doi.org/10.1016/j.nme.2022.101254. https://www.osti.gov/servlets/purl/1895115.
@article{osti_1895115,
title = {Modeling the effect of nitrogen recycling on the erosion and leakage of tungsten impurities from the SAS-VW divertor in DIII-D during nitrogen gas injection},
author = {Parsons, Matthew S. and Sinclair, Gregory and Abrams, Tyler},
abstractNote = {The new SAS-VW divertor in DIII-D has tungsten-coated components to enable the study of tungsten erosion and leakage from a closed, slot-like divertor. A proposed method of actively managing the tungsten impurities is to inject low-Z impurities, such as nitrogen, into the Scrape-off-Layer (SOL) to modify the conditions in the plasma boundary and in turn manipulate both the erosion and subsequent transport of tungsten. Nitrogen injection from the SOL crown has been modeled using SOLPS-ITER to calculate the background plasma including the intrinsic carbon and the injected nitrogen impurities, and subsequently DIVIMP has been used to calculate the tungsten erosion and transport on top of the background plasma solution. This workflow has been used to model scenarios at a variety of nitrogen injection rates with different assumptions about the nitrogen recycling at the target. In the scenario modeled here, an optimal nitrogen injection rate around 3-4 x 1020 N/s is found to reduce the amount of tungsten reaching the core by a factor of about 2.4. However, when the nitrogen recycling rate at the divertor targets is high, the nitrogen redistributes within the slot leading to increased tungsten sputtering, and the range of injection rates resulting in tungsten mitigation becomes narrower.},
doi = {10.1016/j.nme.2022.101254},
journal = {Nuclear Materials and Energy},
number = ,
volume = 33,
place = {United States},
year = {Tue Sep 20 00:00:00 EDT 2022},
month = {Tue Sep 20 00:00:00 EDT 2022}
}
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