SOLPS modeling of the effect on plasma detachment of closing the lower divertor in DIII-D
Abstract
SOLPS modeling has been carried out to assess the effect of tightly closing the lower divertor in DIII-D, which at present is almost fully open, on the achievement of cold dissipative/detached divertor conditions. To isolate the impact of other factors on the divertor plasma solution and to make direct comparisons, most of the parameters including the meshes were kept as similar as possible. Only the neutral baffling was modified to compare a fully open divertor with a tightly closed one. The modeling shows that the tightly closed divertor greatly improves trapping of recycling neutrals, thereby increasing radiative and charge exchange losses in the divertor and reducing the electron temperature Tet and deposited power density qdep at the target plate. Furthermore, the closed structure enables the divertor plasma to enter into highly dissipative and detached divertor conditions at a significantly lower upstream density. The effects of divertor closure on the neutral density and pressure, and their correlation with the divertor plasma conditions are also demonstrated. The effect of molecular D2- ion D+ elastic collisions and neutral-neutral collisions on the divertor plasma solution are assessed.
- Authors:
-
- General Atomics, San Diego, CA (United States); Dalian Univ. of Technology, Dalian (People's Republic of China)
- Univ. of Toronto, Toronto (Canada)
- General Atomics, San Diego, CA (United States)
- Publication Date:
- Research Org.:
- General Atomics, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE
- Contributing Org.:
- University of Toronto, Institute for Aerospace Studies, 4925 Dufferin St. Toronto, M3H5T6, Canada
- OSTI Identifier:
- 1372093
- Alternate Identifier(s):
- OSTI ID: 1336509
- Grant/Contract Number:
- FC02-04ER54698
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Plasma Physics and Controlled Fusion
- Additional Journal Information:
- Journal Volume: 59; Journal Issue: 2; Related Information: C.F. Sang, P.C. Stangeby, H.Y. Guo, A.W. Leonard, B. Covele, L.L. Lao, A.L. Moser, and D.M. Thomas, "SOLPS Modeling of the Effect on Plasma Detachment of Closing the Lower Divertor in DIII-D", Plasma Phys. control Fusion 59, 025009 (10pp) (2017); Journal ID: ISSN 0741-3335
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; divertor; detachment; modeling; DIII-D
Citation Formats
Sang, C. F., Stangeby, P. C., Guo, H. Y., Leonard, A. W., Covele, B., Lao, L. L., Moser, A. L., and Thomas, D. M. SOLPS modeling of the effect on plasma detachment of closing the lower divertor in DIII-D. United States: N. p., 2016.
Web. doi:10.1088/1361-6587/59/2/025009.
Sang, C. F., Stangeby, P. C., Guo, H. Y., Leonard, A. W., Covele, B., Lao, L. L., Moser, A. L., & Thomas, D. M. SOLPS modeling of the effect on plasma detachment of closing the lower divertor in DIII-D. United States. https://doi.org/10.1088/1361-6587/59/2/025009
Sang, C. F., Stangeby, P. C., Guo, H. Y., Leonard, A. W., Covele, B., Lao, L. L., Moser, A. L., and Thomas, D. M. Thu .
"SOLPS modeling of the effect on plasma detachment of closing the lower divertor in DIII-D". United States. https://doi.org/10.1088/1361-6587/59/2/025009. https://www.osti.gov/servlets/purl/1372093.
@article{osti_1372093,
title = {SOLPS modeling of the effect on plasma detachment of closing the lower divertor in DIII-D},
author = {Sang, C. F. and Stangeby, P. C. and Guo, H. Y. and Leonard, A. W. and Covele, B. and Lao, L. L. and Moser, A. L. and Thomas, D. M.},
abstractNote = {SOLPS modeling has been carried out to assess the effect of tightly closing the lower divertor in DIII-D, which at present is almost fully open, on the achievement of cold dissipative/detached divertor conditions. To isolate the impact of other factors on the divertor plasma solution and to make direct comparisons, most of the parameters including the meshes were kept as similar as possible. Only the neutral baffling was modified to compare a fully open divertor with a tightly closed one. The modeling shows that the tightly closed divertor greatly improves trapping of recycling neutrals, thereby increasing radiative and charge exchange losses in the divertor and reducing the electron temperature Tet and deposited power density qdep at the target plate. Furthermore, the closed structure enables the divertor plasma to enter into highly dissipative and detached divertor conditions at a significantly lower upstream density. The effects of divertor closure on the neutral density and pressure, and their correlation with the divertor plasma conditions are also demonstrated. The effect of molecular D2- ion D+ elastic collisions and neutral-neutral collisions on the divertor plasma solution are assessed.},
doi = {10.1088/1361-6587/59/2/025009},
journal = {Plasma Physics and Controlled Fusion},
number = 2,
volume = 59,
place = {United States},
year = {Thu Dec 15 00:00:00 EST 2016},
month = {Thu Dec 15 00:00:00 EST 2016}
}
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Works referencing / citing this record:
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Effects of carbon impurities on the power radiation and tungsten target erosion in EAST
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Modeling study of the onset density for divertor detachment on EAST
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