Resistive wall tearing mode disruptions in DIII-D and ITER tokamaks
Abstract
Disruptions are a serious problem in tokamaks, in which thermal and magnetic energy confinement is lost. This paper uses data from the DIII-D experiment, theory, and simulations to demonstrate that resistive wall tearing modes (RWTMs) produce the thermal quench (TQ) in a typical locked mode shot. Analysis of the linear RWTM dispersion relation shows the parameter dependence of the growth rate, particularly on the resistive wall time. Linear simulations of the locked mode equilibrium show that it is unstable with a resistive wall and stable with an ideally conducting wall. Nonlinear simulations demonstrate that the RWTM grows to sufficient amplitude to cause a complete thermal quench. The RWTM growth time is proportional to the thermal quench time. The nonlinearly saturated RWTM magnetic perturbation amplitude agrees with experimental measurements. The onset condition is that the q = 2 rational surface is sufficiently close to the resistive wall. Collectively, this identifies the RWTM as the cause of the TQ. In ITER, RWTMs will produce long TQ times compared to present-day experiments. ITER disruptions may be significantly more benign than previously predicted.
- Authors:
-
[1];
[2];
[2]
- HRS Fusion, West Orange, NJ (United States)
- General Atomics, San Diego, CA (United States)
- Publication Date:
- Research Org.:
- HRS Fusion, West Orange, NJ (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1898074
- Alternate Identifier(s):
- OSTI ID: 1898223
- Grant/Contract Number:
- SC0020127; FC02-04ER54698; S015879; SC0018109
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 29; Journal Issue: 11; 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; disruptions; simulation; resistive wall tearing mode; plasma confinement; plasma waves; linear stability analysis; plasma simulation; magnetic energy; tokamaks; plasma instabilities; computer programming
Citation Formats
Strauss, Henry R., Lyons, Brendan C., and Knolker, Matthias. Resistive wall tearing mode disruptions in DIII-D and ITER tokamaks. United States: N. p., 2022.
Web. doi:10.1063/5.0107048.
Strauss, Henry R., Lyons, Brendan C., & Knolker, Matthias. Resistive wall tearing mode disruptions in DIII-D and ITER tokamaks. United States. https://doi.org/10.1063/5.0107048
Strauss, Henry R., Lyons, Brendan C., and Knolker, Matthias. Tue .
"Resistive wall tearing mode disruptions in DIII-D and ITER tokamaks". United States. https://doi.org/10.1063/5.0107048. https://www.osti.gov/servlets/purl/1898074.
@article{osti_1898074,
title = {Resistive wall tearing mode disruptions in DIII-D and ITER tokamaks},
author = {Strauss, Henry R. and Lyons, Brendan C. and Knolker, Matthias},
abstractNote = {Disruptions are a serious problem in tokamaks, in which thermal and magnetic energy confinement is lost. This paper uses data from the DIII-D experiment, theory, and simulations to demonstrate that resistive wall tearing modes (RWTMs) produce the thermal quench (TQ) in a typical locked mode shot. Analysis of the linear RWTM dispersion relation shows the parameter dependence of the growth rate, particularly on the resistive wall time. Linear simulations of the locked mode equilibrium show that it is unstable with a resistive wall and stable with an ideally conducting wall. Nonlinear simulations demonstrate that the RWTM grows to sufficient amplitude to cause a complete thermal quench. The RWTM growth time is proportional to the thermal quench time. The nonlinearly saturated RWTM magnetic perturbation amplitude agrees with experimental measurements. The onset condition is that the q = 2 rational surface is sufficiently close to the resistive wall. Collectively, this identifies the RWTM as the cause of the TQ. In ITER, RWTMs will produce long TQ times compared to present-day experiments. ITER disruptions may be significantly more benign than previously predicted.},
doi = {10.1063/5.0107048},
journal = {Physics of Plasmas},
number = 11,
volume = 29,
place = {United States},
year = {Tue Nov 15 00:00:00 EST 2022},
month = {Tue Nov 15 00:00:00 EST 2022}
}
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