Pulsed RF schemes for tearing mode stabilization
Abstract
The RF stabilization of tearing modes with current condensation has the potential to increase stabilization efficiency and loosen power localization requirements. Such benefits stem from the cooperative feedback between the RF deposition and the resulting island temperature perturbation governed by diffusion. A self-consistent treatment of the damping of an rf ray as it traverses the island shows that low damping scenarios can require unfavorably high powers to overcome initial power leakage and effectively capitalize on the nonlinear effect. In this work, it is demonstrated that for such regimes, modulated stabilization schemes can achieve significant improvements in heating and current drive contributions to stabilization for the same average power as a continuous wave scheme. The impact of modulation frequency and duty cycle on the performance is explored, the results of which suggest modulation strategies in which the pulsing periods are kept on the order of a diffusive time.
- Authors:
-
[1];
[1];
[1]
- Princeton Univ., NJ (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1668079
- Alternate Identifier(s):
- OSTI ID: 1632731
- Grant/Contract Number:
- AC02-09CH11466; SC0016072
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 27; Journal Issue: 6; 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
Jin, S., Fisch, N. J., and Reiman, A. H. Pulsed RF schemes for tearing mode stabilization. United States: N. p., 2020.
Web. doi:10.1063/5.0007861.
Jin, S., Fisch, N. J., & Reiman, A. H. Pulsed RF schemes for tearing mode stabilization. United States. https://doi.org/10.1063/5.0007861
Jin, S., Fisch, N. J., and Reiman, A. H. Tue .
"Pulsed RF schemes for tearing mode stabilization". United States. https://doi.org/10.1063/5.0007861. https://www.osti.gov/servlets/purl/1668079.
@article{osti_1668079,
title = {Pulsed RF schemes for tearing mode stabilization},
author = {Jin, S. and Fisch, N. J. and Reiman, A. H.},
abstractNote = {The RF stabilization of tearing modes with current condensation has the potential to increase stabilization efficiency and loosen power localization requirements. Such benefits stem from the cooperative feedback between the RF deposition and the resulting island temperature perturbation governed by diffusion. A self-consistent treatment of the damping of an rf ray as it traverses the island shows that low damping scenarios can require unfavorably high powers to overcome initial power leakage and effectively capitalize on the nonlinear effect. In this work, it is demonstrated that for such regimes, modulated stabilization schemes can achieve significant improvements in heating and current drive contributions to stabilization for the same average power as a continuous wave scheme. The impact of modulation frequency and duty cycle on the performance is explored, the results of which suggest modulation strategies in which the pulsing periods are kept on the order of a diffusive time.},
doi = {10.1063/5.0007861},
journal = {Physics of Plasmas},
number = 6,
volume = 27,
place = {United States},
year = {Tue Jun 09 00:00:00 EDT 2020},
month = {Tue Jun 09 00:00:00 EDT 2020}
}
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