Effects of temperature and density evolution in MHD simulations of HIT-SI
Abstract
The helicity injected torus-steady inductive (HIT-SI) experiment uses steady inductive helicity injection to form a spheromak equilibrium and sustain the structure against resistive decay. Helicity injection is performed using two half-tori “injectors” connected to the main plasma volume, whose fields are oscillated in an AC manner. The properties of the sustained spheromak equilibrium have been experimentally observed to vary with the frequency of the injector oscillation, producing higher current gains and more-symmetric and outwardly shifted current centroids with higher frequency. A computational scan of injector frequency using the 3D MHD code PSI-Tet, which models the entire HIT-SI plasma volume including the injectors, has been performed, including a comparison of the results using the full Hall MHD model to those obtained using a simplified “zero-beta” (constant temperature and density) model. The results of both PSI-Tet models are also compared with experimental data and with simulations using the NIMROD code, which does not model the injector regions. The results of the PSI-Tet simulations show that the average temperature and current gain increase with injector frequency, in agreement with experimental trends. The simulations also show qualitative changes in the dynamics of several quantities with increasing injector frequency, such as density oscillations and currentmore »
- Authors:
-
[1];
[1];
[1];
[1]
- Department of Aeronautics and Astronautics, University of Washington, Seattle, Washington 98195, USA
- Publication Date:
- Research Org.:
- Univ. of Washington, Seattle, WA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1608226
- Alternate Identifier(s):
- OSTI ID: 1608171
- Grant/Contract Number:
- SC0016256; FG02-96ER54361
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 27; Journal Issue: 4; 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; 97 MATHEMATICS AND COMPUTING
Citation Formats
Benedett, T. E., Hansen, C. J., Morgan, K. D., and Jarboe, T. R. Effects of temperature and density evolution in MHD simulations of HIT-SI. United States: N. p., 2020.
Web. doi:10.1063/1.5142298.
Benedett, T. E., Hansen, C. J., Morgan, K. D., & Jarboe, T. R. Effects of temperature and density evolution in MHD simulations of HIT-SI. United States. https://doi.org/10.1063/1.5142298
Benedett, T. E., Hansen, C. J., Morgan, K. D., and Jarboe, T. R. Fri .
"Effects of temperature and density evolution in MHD simulations of HIT-SI". United States. https://doi.org/10.1063/1.5142298. https://www.osti.gov/servlets/purl/1608226.
@article{osti_1608226,
title = {Effects of temperature and density evolution in MHD simulations of HIT-SI},
author = {Benedett, T. E. and Hansen, C. J. and Morgan, K. D. and Jarboe, T. R.},
abstractNote = {The helicity injected torus-steady inductive (HIT-SI) experiment uses steady inductive helicity injection to form a spheromak equilibrium and sustain the structure against resistive decay. Helicity injection is performed using two half-tori “injectors” connected to the main plasma volume, whose fields are oscillated in an AC manner. The properties of the sustained spheromak equilibrium have been experimentally observed to vary with the frequency of the injector oscillation, producing higher current gains and more-symmetric and outwardly shifted current centroids with higher frequency. A computational scan of injector frequency using the 3D MHD code PSI-Tet, which models the entire HIT-SI plasma volume including the injectors, has been performed, including a comparison of the results using the full Hall MHD model to those obtained using a simplified “zero-beta” (constant temperature and density) model. The results of both PSI-Tet models are also compared with experimental data and with simulations using the NIMROD code, which does not model the injector regions. The results of the PSI-Tet simulations show that the average temperature and current gain increase with injector frequency, in agreement with experimental trends. The simulations also show qualitative changes in the dynamics of several quantities with increasing injector frequency, such as density oscillations and current evolution. However, the outward shift and symmetrizing of the current centroid, observed experimentally, are not observed in these MHD simulations, indicating that unresolved or excluded dynamics may be important.},
doi = {10.1063/1.5142298},
journal = {Physics of Plasmas},
number = 4,
volume = 27,
place = {United States},
year = {Fri Apr 03 00:00:00 EDT 2020},
month = {Fri Apr 03 00:00:00 EDT 2020}
}
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