Attainment of a stable, fully detached plasma state in innovative divertor configurations
Abstract
A computational study of long-legged tokamak divertor configurations is performed with the edge transport code UEDGE. Several divertor configurations are considered, with radially or vertically extended, tightly baffled, outer divertor legs and with or without a secondary X-point in the divertor leg volume. For otherwise identical conditions, a scan of the input power from the core plasma is performed. As the power is reduced to a threshold value, the plasma in the outer leg transitions to a fully detached state, which defines the upper limit on the power for detached divertor operation. Reducing the power further results in the detachment front shifting upstream but remains stable. At low power, the detachment front eventually moves all the way to the primary X-point, which is usually associated with degradation of the core plasma, and this defines the lower limit on the power for the detached divertor operation. For the studied parameters, for long-legged divertors, the detached operation window is quite large, in particular, for the X-point target configuration using a secondary X-point in the divertor leg volume, allowing a factor of 5–10 variations in the input power. For the same parameters, for the standard divertor configuration, the detached operation window is verymore »
- Authors:
-
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- MIT Plasma Science and Fusion Center, Cambridge, MA (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1461739
- Alternate Identifier(s):
- OSTI ID: 1373961
- Report Number(s):
- LLNL-JRNL-712618
Journal ID: ISSN 1070-664X; 850966; TRN: US1902034
- Grant/Contract Number:
- 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
Citation Formats
Umansky, M. V., LaBombard, B., Brunner, D., Rensink, M. E., Rognlien, T. D., Terry, J. L., and Whyte, D. G. Attainment of a stable, fully detached plasma state in innovative divertor configurations. United States: N. p., 2017.
Web. doi:10.1063/1.4979193.
Umansky, M. V., LaBombard, B., Brunner, D., Rensink, M. E., Rognlien, T. D., Terry, J. L., & Whyte, D. G. Attainment of a stable, fully detached plasma state in innovative divertor configurations. United States. https://doi.org/10.1063/1.4979193
Umansky, M. V., LaBombard, B., Brunner, D., Rensink, M. E., Rognlien, T. D., Terry, J. L., and Whyte, D. G. Tue .
"Attainment of a stable, fully detached plasma state in innovative divertor configurations". United States. https://doi.org/10.1063/1.4979193. https://www.osti.gov/servlets/purl/1461739.
@article{osti_1461739,
title = {Attainment of a stable, fully detached plasma state in innovative divertor configurations},
author = {Umansky, M. V. and LaBombard, B. and Brunner, D. and Rensink, M. E. and Rognlien, T. D. and Terry, J. L. and Whyte, D. G.},
abstractNote = {A computational study of long-legged tokamak divertor configurations is performed with the edge transport code UEDGE. Several divertor configurations are considered, with radially or vertically extended, tightly baffled, outer divertor legs and with or without a secondary X-point in the divertor leg volume. For otherwise identical conditions, a scan of the input power from the core plasma is performed. As the power is reduced to a threshold value, the plasma in the outer leg transitions to a fully detached state, which defines the upper limit on the power for detached divertor operation. Reducing the power further results in the detachment front shifting upstream but remains stable. At low power, the detachment front eventually moves all the way to the primary X-point, which is usually associated with degradation of the core plasma, and this defines the lower limit on the power for the detached divertor operation. For the studied parameters, for long-legged divertors, the detached operation window is quite large, in particular, for the X-point target configuration using a secondary X-point in the divertor leg volume, allowing a factor of 5–10 variations in the input power. For the same parameters, for the standard divertor configuration, the detached operation window is very small or even non-existent. In conclusion, the present modeling results suggest the possibility of stable fully detached divertor operation for a tokamak with tightly baffled extended divertor legs.},
doi = {10.1063/1.4979193},
journal = {Physics of Plasmas},
number = 5,
volume = 24,
place = {United States},
year = {Tue Mar 28 00:00:00 EDT 2017},
month = {Tue Mar 28 00:00:00 EDT 2017}
}
Web of Science
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