Drifts, currents, and power scrape-off width in SOLPS-ITER modeling of DIII-D
Abstract
The effects of drifts and associated flows and currents on the width of the parallel heat flux channel (λq) in the tokamak scrape-off layer (SOL) are analyzed using the SOLPS-ITER 2D fluid transport code. Motivation is supplied by Goldston’s heuristic drift (HD) model for λq, which yields the same approximately inverse poloidal magnetic field dependence seen in multi-machine regression. The analysis, focusing on a DIII-D H-mode discharge, reveals HD-like features, including comparable density and temperature fall-off lengths in the SOL, and up-down ion pressure asymmetry that allows net cross-separatrix ion magnetic drift flux to exceed net anomalous ion flux. In experimentally relevant high-recycling cases, scans of both toroidal and poloidal magnetic field (Btor and Bpol) are conducted, showing minimal λq dependence on either component of the field. Insensitivity to Btor is expected, and suggests that SOLPS-ITER is effectively capturing some aspects of HD physics. Absence of λq dependence on Bpol, however, is inconsistent with both the HD model and experimental results. As a result, the inconsistency is attributed to strong variation in the parallel Mach number, which violates one of the premises of the HD model.
- Authors:
-
[1];
[2];
- College of William and Mary, Williamsburg, VA (United States)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Peter the Great St. Petersburg Polytechnic Univ., St. Petersburg (Russia)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Publication Date:
- Research Org.:
- College of William and Mary, Williamsburg, VA (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE
- Contributing Org.:
- College of William and Mary, Williamsburg, VA 23187, USA
- OSTI Identifier:
- 1349231
- Grant/Contract Number:
- SC0010434.
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Materials and Energy
- Additional Journal Information:
- Journal Volume: 12; Journal Issue: C; Journal ID: ISSN 2352-1791
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Power scrape-off width; SOLPS-ITER; Drift effects; SOL flows
Citation Formats
Meier, E. T., Goldston, R. J., Kaveeva, E. G., Makowski, M. A., Mordijck, S., Rozhansky, V. A., Senichenkov, I. Yu., and Voskoboynikov, S. P. Drifts, currents, and power scrape-off width in SOLPS-ITER modeling of DIII-D. United States: N. p., 2016.
Web. doi:10.1016/j.nme.2016.12.016.
Meier, E. T., Goldston, R. J., Kaveeva, E. G., Makowski, M. A., Mordijck, S., Rozhansky, V. A., Senichenkov, I. Yu., & Voskoboynikov, S. P. Drifts, currents, and power scrape-off width in SOLPS-ITER modeling of DIII-D. United States. https://doi.org/10.1016/j.nme.2016.12.016
Meier, E. T., Goldston, R. J., Kaveeva, E. G., Makowski, M. A., Mordijck, S., Rozhansky, V. A., Senichenkov, I. Yu., and Voskoboynikov, S. P. Tue .
"Drifts, currents, and power scrape-off width in SOLPS-ITER modeling of DIII-D". United States. https://doi.org/10.1016/j.nme.2016.12.016. https://www.osti.gov/servlets/purl/1349231.
@article{osti_1349231,
title = {Drifts, currents, and power scrape-off width in SOLPS-ITER modeling of DIII-D},
author = {Meier, E. T. and Goldston, R. J. and Kaveeva, E. G. and Makowski, M. A. and Mordijck, S. and Rozhansky, V. A. and Senichenkov, I. Yu. and Voskoboynikov, S. P.},
abstractNote = {The effects of drifts and associated flows and currents on the width of the parallel heat flux channel (λq) in the tokamak scrape-off layer (SOL) are analyzed using the SOLPS-ITER 2D fluid transport code. Motivation is supplied by Goldston’s heuristic drift (HD) model for λq, which yields the same approximately inverse poloidal magnetic field dependence seen in multi-machine regression. The analysis, focusing on a DIII-D H-mode discharge, reveals HD-like features, including comparable density and temperature fall-off lengths in the SOL, and up-down ion pressure asymmetry that allows net cross-separatrix ion magnetic drift flux to exceed net anomalous ion flux. In experimentally relevant high-recycling cases, scans of both toroidal and poloidal magnetic field (Btor and Bpol) are conducted, showing minimal λq dependence on either component of the field. Insensitivity to Btor is expected, and suggests that SOLPS-ITER is effectively capturing some aspects of HD physics. Absence of λq dependence on Bpol, however, is inconsistent with both the HD model and experimental results. As a result, the inconsistency is attributed to strong variation in the parallel Mach number, which violates one of the premises of the HD model.},
doi = {10.1016/j.nme.2016.12.016},
journal = {Nuclear Materials and Energy},
number = C,
volume = 12,
place = {United States},
year = {Tue Dec 27 00:00:00 EST 2016},
month = {Tue Dec 27 00:00:00 EST 2016}
}
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Works referencing / citing this record:
Drift effects and up-down asymmetry in balanced double-null DIII-D divertor configurations
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