Testing the role of molecular physics in dissipative divertor operations through helium plasmas at DIII-D
Abstract
Recent experiments in DIII-D helium plasmas are examined to resolve the role of atomic and molecular physics in major discrepancies between experiment and modeling of dissipative divertor operation. Helium operation removes the complicated molecular processes of deuterium plasmas that are a prime candidate for the inability of standard fluid models to reproduce dissipative divertor operation, primarily the consistent under-prediction of radiated power. Modeling of these experiments shows that the full divertor radiation can be accounted for, but only if measures are taken to ensure that the model reproduces the measured divertor density. Relying on upstream measurements instead results in a lower divertor density and radiation than is measured, indicating a need for improved modeling of the connection between the divertor and the upstream scrape-off layer. In conclusion, these results show that fluid models are able to quantitatively describe the divertor-region plasma, including radiative losses, and indicate that efforts to improve the fidelity of the molecular deuterium models are likely to help resolve the discrepancy in radiation for deuterium plasmas.
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Aalto Univ., Espoo (Finland)
- General Atomics, San Diego, CA (United States)
- Publication Date:
- Research Org.:
- General Atomics, San Diego, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE
- Contributing Org.:
- BPMIC Team
- OSTI Identifier:
- 1373415
- Alternate Identifier(s):
- OSTI ID: 1361847; OSTI ID: 1394181
- Grant/Contract Number:
- FC02-04ER54698; AC05-00OR22725; AC52-07NA27344
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 24; Journal Issue: 5; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; divertors; experiment design; tokamaks; plasma temperature; atomic and molecular physics
Citation Formats
Canik, John M., Briesemeister, Alexis R., McLean, Adam G., Groth, Mathias, Leonard, Anthony W., Lore, Jeremy D., and Moser, Auna. Testing the role of molecular physics in dissipative divertor operations through helium plasmas at DIII-D. United States: N. p., 2017.
Web. doi:10.1063/1.4982057.
Canik, John M., Briesemeister, Alexis R., McLean, Adam G., Groth, Mathias, Leonard, Anthony W., Lore, Jeremy D., & Moser, Auna. Testing the role of molecular physics in dissipative divertor operations through helium plasmas at DIII-D. United States. https://doi.org/10.1063/1.4982057
Canik, John M., Briesemeister, Alexis R., McLean, Adam G., Groth, Mathias, Leonard, Anthony W., Lore, Jeremy D., and Moser, Auna. Wed .
"Testing the role of molecular physics in dissipative divertor operations through helium plasmas at DIII-D". United States. https://doi.org/10.1063/1.4982057. https://www.osti.gov/servlets/purl/1373415.
@article{osti_1373415,
title = {Testing the role of molecular physics in dissipative divertor operations through helium plasmas at DIII-D},
author = {Canik, John M. and Briesemeister, Alexis R. and McLean, Adam G. and Groth, Mathias and Leonard, Anthony W. and Lore, Jeremy D. and Moser, Auna},
abstractNote = {Recent experiments in DIII-D helium plasmas are examined to resolve the role of atomic and molecular physics in major discrepancies between experiment and modeling of dissipative divertor operation. Helium operation removes the complicated molecular processes of deuterium plasmas that are a prime candidate for the inability of standard fluid models to reproduce dissipative divertor operation, primarily the consistent under-prediction of radiated power. Modeling of these experiments shows that the full divertor radiation can be accounted for, but only if measures are taken to ensure that the model reproduces the measured divertor density. Relying on upstream measurements instead results in a lower divertor density and radiation than is measured, indicating a need for improved modeling of the connection between the divertor and the upstream scrape-off layer. In conclusion, these results show that fluid models are able to quantitatively describe the divertor-region plasma, including radiative losses, and indicate that efforts to improve the fidelity of the molecular deuterium models are likely to help resolve the discrepancy in radiation for deuterium plasmas.},
doi = {10.1063/1.4982057},
journal = {Physics of Plasmas},
number = 5,
volume = 24,
place = {United States},
year = {Wed May 10 00:00:00 EDT 2017},
month = {Wed May 10 00:00:00 EDT 2017}
}
Web of Science
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Works referencing / citing this record:
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