Coupling extended magnetohydrodynamic fluid codes with radiofrequency ray tracing codes for fusion modeling
Abstract
Neoclassical tearing modes are macroscopic ($$L$$ ~ 1 m) instabilities in magnetic fusion experiments; if unchecked, these modes degrade plasma performance and may catastrophically destroy plasma confinement by inducing a disruption. Fortunately, the use of properly tuned and directed radiofrequency waves ($$λ$$ ~ 1 mm) can eliminate these modes. Numerical modeling of this difficult multiscale problem requires the integration of separate mathematical models for each length and time scale [T. G. Jenkins, S. E. Kruger, Phys. Plasmas 19 (2012) 122508]; the extended MHD model captures macroscopic plasma evolution while the RF model tracks the flow and deposition of injected RF power through the evolving plasma profiles. The scale separation enables use of the eikonal (ray-tracing) approximation to model the RF wave propagation. In this work we demonstrate a technique, based on methods of computational geometry, for mapping the ensuing RF data (associated with discrete ray trajectories) onto the finite-element/pseudospectral grid that is used to model the extended MHD physics. In the new representation, the RF data can then be used to construct source terms in the equations of the extended MHD model, enabling quantitative modeling of RF-induced tearing mode stabilization. Though our specific implementation uses the NIMROD extended MHD [C. R. Sovinec et al., J. Comp. Phys. 195 (2004) 355] and GENRAY RF [A. P. Smirnov, R. W. Harvey, K. Kupfer, Bull. Amer. Phys. Soc. 39 (1994) 1626] codes, the approach presented can be applied more generally to any code coupling requiring the mapping of ray tracing data onto Eulerian grids.
- Authors:
-
[1];
- Tech-X Corporation, Boulder, CO (United States)
- Utah State Univ., Logan, UT (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Univ. of California, Oakland, CA (United States); UT-Battelle LLC/ORNL, Oak Ridge, TN (United States); Univ. of Wisconsin, Madison, WI (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1565301
- Alternate Identifier(s):
- OSTI ID: 1249981
- Grant/Contract Number:
- AC02-05CH11231; AC05-00OR22725; FC02-06ER54899
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Computational Physics
- Additional Journal Information:
- Journal Volume: 297; Journal Issue: C; Journal ID: ISSN 0021-9991
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; computer science; physics; computational geometry; ray tracing; finite element methods; pseudospectral methods; magnetohydrodynamics; radiofrequency waves
Citation Formats
Jenkins, Thomas G., and Held, Eric D. Coupling extended magnetohydrodynamic fluid codes with radiofrequency ray tracing codes for fusion modeling. United States: N. p., 2015.
Web. doi:10.1016/j.jcp.2015.05.035.
Jenkins, Thomas G., & Held, Eric D. Coupling extended magnetohydrodynamic fluid codes with radiofrequency ray tracing codes for fusion modeling. United States. https://doi.org/10.1016/j.jcp.2015.05.035
Jenkins, Thomas G., and Held, Eric D. Tue .
"Coupling extended magnetohydrodynamic fluid codes with radiofrequency ray tracing codes for fusion modeling". United States. https://doi.org/10.1016/j.jcp.2015.05.035. https://www.osti.gov/servlets/purl/1565301.
@article{osti_1565301,
title = {Coupling extended magnetohydrodynamic fluid codes with radiofrequency ray tracing codes for fusion modeling},
author = {Jenkins, Thomas G. and Held, Eric D.},
abstractNote = {Neoclassical tearing modes are macroscopic ($L$ ~ 1 m) instabilities in magnetic fusion experiments; if unchecked, these modes degrade plasma performance and may catastrophically destroy plasma confinement by inducing a disruption. Fortunately, the use of properly tuned and directed radiofrequency waves ($λ$ ~ 1 mm) can eliminate these modes. Numerical modeling of this difficult multiscale problem requires the integration of separate mathematical models for each length and time scale [T. G. Jenkins, S. E. Kruger, Phys. Plasmas 19 (2012) 122508]; the extended MHD model captures macroscopic plasma evolution while the RF model tracks the flow and deposition of injected RF power through the evolving plasma profiles. The scale separation enables use of the eikonal (ray-tracing) approximation to model the RF wave propagation. In this work we demonstrate a technique, based on methods of computational geometry, for mapping the ensuing RF data (associated with discrete ray trajectories) onto the finite-element/pseudospectral grid that is used to model the extended MHD physics. In the new representation, the RF data can then be used to construct source terms in the equations of the extended MHD model, enabling quantitative modeling of RF-induced tearing mode stabilization. Though our specific implementation uses the NIMROD extended MHD [C. R. Sovinec et al., J. Comp. Phys. 195 (2004) 355] and GENRAY RF [A. P. Smirnov, R. W. Harvey, K. Kupfer, Bull. Amer. Phys. Soc. 39 (1994) 1626] codes, the approach presented can be applied more generally to any code coupling requiring the mapping of ray tracing data onto Eulerian grids.},
doi = {10.1016/j.jcp.2015.05.035},
journal = {Journal of Computational Physics},
number = C,
volume = 297,
place = {United States},
year = {Tue Sep 15 00:00:00 EDT 2015},
month = {Tue Sep 15 00:00:00 EDT 2015}
}
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