Two-fluid model of rf current condensation in magnetic islands
Abstract
The stabilization of tearing modes with rf waves is subject to a nonlinear effect, termed rf current condensation, that has the potential to greatly enhance and localize current driven within magnetic islands. Here we extend previous investigations of this effect with a two fluid model that captures the balance of diffusive and thermal equilibration processes within the island. We show that the effective power and resulting strength of the condensation effect can be greatly enhanced by avoiding collisional heat loss to the ions. The relative impact of collisions on the overall power balance within the island depends on the ratio of the characteristic diffusion timescale and the electron–ion equilibration time, rather than the latter alone. Although relative heat loss to ions increases with island size, the heating efficiency does as well. In particular, we show that the latter safely dominates for large deposition profiles, as is typically the case for lower hybrid current drive. This supports the possibility of passive stabilization of neoclassical tearing modes without the precise aiming of the rf waves required for electron cyclotron current drive stabilization.
- Authors:
-
[1];
[1];
[1]
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Princeton Univ., NJ (United States)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1818909
- Alternate Identifier(s):
- OSTI ID: 1781878
- Grant/Contract Number:
- AC02-09CH11466; SC0016072
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 28; Journal Issue: 5; 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; plasma confinement; thermal diffusivity; plasma heating; tokamaks; RF waves
Citation Formats
Jin, S., Reiman, A. H., and Fisch, N. J. Two-fluid model of rf current condensation in magnetic islands. United States: N. p., 2021.
Web. doi:10.1063/5.0048506.
Jin, S., Reiman, A. H., & Fisch, N. J. Two-fluid model of rf current condensation in magnetic islands. United States. https://doi.org/10.1063/5.0048506
Jin, S., Reiman, A. H., and Fisch, N. J. Wed .
"Two-fluid model of rf current condensation in magnetic islands". United States. https://doi.org/10.1063/5.0048506. https://www.osti.gov/servlets/purl/1818909.
@article{osti_1818909,
title = {Two-fluid model of rf current condensation in magnetic islands},
author = {Jin, S. and Reiman, A. H. and Fisch, N. J.},
abstractNote = {The stabilization of tearing modes with rf waves is subject to a nonlinear effect, termed rf current condensation, that has the potential to greatly enhance and localize current driven within magnetic islands. Here we extend previous investigations of this effect with a two fluid model that captures the balance of diffusive and thermal equilibration processes within the island. We show that the effective power and resulting strength of the condensation effect can be greatly enhanced by avoiding collisional heat loss to the ions. The relative impact of collisions on the overall power balance within the island depends on the ratio of the characteristic diffusion timescale and the electron–ion equilibration time, rather than the latter alone. Although relative heat loss to ions increases with island size, the heating efficiency does as well. In particular, we show that the latter safely dominates for large deposition profiles, as is typically the case for lower hybrid current drive. This supports the possibility of passive stabilization of neoclassical tearing modes without the precise aiming of the rf waves required for electron cyclotron current drive stabilization.},
doi = {10.1063/5.0048506},
journal = {Physics of Plasmas},
number = 5,
volume = 28,
place = {United States},
year = {Wed May 05 00:00:00 EDT 2021},
month = {Wed May 05 00:00:00 EDT 2021}
}
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