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Title: 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 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:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Princeton Univ., NJ (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (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. doi:10.1063/5.0007861.
Jin, S., Fisch, N. J., and Reiman, A. H. Tue . "Pulsed RF schemes for tearing mode stabilization". United States. doi:10.1063/5.0007861.
@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 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 = {2020},
month = {6}
}

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