Optimization of quasi-axisymmetric stellarators with varied elongation
Abstract
An optimization study of Quasi-Axisymmetric (QA) stellarators with varied elongation has been carried out using the optimization code STELLOPT. The starting point of our optimization is a previously obtained QA stellarator with 3 field periods and aspect ratio of 6. Here, a series of QA stellarators are obtained at zero plasma beta with varied elongation value ranging from 2.5 to 3.7. Good quasi-symmetry is kept when the elongation value is reduced from the original value of 3.7. The rotational transform profile and aspect ratio are kept fixed. The plasma volume is ether kept fixed or varied linearly with elongation. Furthermore, finite beta QA stellarators are considered. The corresponding bootstrap currents are calculated using the kinetic code SFINCS. A series of kink-stable QA stellarators are obtained via optimization with varied plasma beta up to 5% and self-consistent bootstrap current. This work demonstrates that good QA stellarators with finite beta and varied elongation exist that are stable to external kink modes.
- Authors:
-
[2];
[3];
[4];
[1]
- Zhejiang Univ., Hangzhou (China)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Max Planck Inst. fuer Plasmaphysik, Greifswald (Germany)
- Univ. of Maryland, College Park, MD (United States)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1659658
- Alternate Identifier(s):
- OSTI ID: 1597144
- Grant/Contract Number:
- AC02-09CH11466
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 27; Journal Issue: 2; 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
Feng, Zhichen, Gates, David A., Lazerson, Samuel A., Landreman, Matt, Pomphrey, Neil, and Fu, GuoYong. Optimization of quasi-axisymmetric stellarators with varied elongation. United States: N. p., 2020.
Web. doi:10.1063/1.5127948.
Feng, Zhichen, Gates, David A., Lazerson, Samuel A., Landreman, Matt, Pomphrey, Neil, & Fu, GuoYong. Optimization of quasi-axisymmetric stellarators with varied elongation. United States. https://doi.org/10.1063/1.5127948
Feng, Zhichen, Gates, David A., Lazerson, Samuel A., Landreman, Matt, Pomphrey, Neil, and Fu, GuoYong. Tue .
"Optimization of quasi-axisymmetric stellarators with varied elongation". United States. https://doi.org/10.1063/1.5127948. https://www.osti.gov/servlets/purl/1659658.
@article{osti_1659658,
title = {Optimization of quasi-axisymmetric stellarators with varied elongation},
author = {Feng, Zhichen and Gates, David A. and Lazerson, Samuel A. and Landreman, Matt and Pomphrey, Neil and Fu, GuoYong},
abstractNote = {An optimization study of Quasi-Axisymmetric (QA) stellarators with varied elongation has been carried out using the optimization code STELLOPT. The starting point of our optimization is a previously obtained QA stellarator with 3 field periods and aspect ratio of 6. Here, a series of QA stellarators are obtained at zero plasma beta with varied elongation value ranging from 2.5 to 3.7. Good quasi-symmetry is kept when the elongation value is reduced from the original value of 3.7. The rotational transform profile and aspect ratio are kept fixed. The plasma volume is ether kept fixed or varied linearly with elongation. Furthermore, finite beta QA stellarators are considered. The corresponding bootstrap currents are calculated using the kinetic code SFINCS. A series of kink-stable QA stellarators are obtained via optimization with varied plasma beta up to 5% and self-consistent bootstrap current. This work demonstrates that good QA stellarators with finite beta and varied elongation exist that are stable to external kink modes.},
doi = {10.1063/1.5127948},
journal = {Physics of Plasmas},
number = 2,
volume = 27,
place = {United States},
year = {Tue Feb 04 00:00:00 EST 2020},
month = {Tue Feb 04 00:00:00 EST 2020}
}
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