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Title: 3D two-temperature magnetohydrodynamic modeling of fast thermal quenches due to injected impurities in tokamaks

Abstract

Here, an integrated model for the ionization, radiation, and advection of impurities in the extended-magnetohydrodynamic code M3D-C1 is described. This implementation makes use of the KPRAD model, which calculates bremsstrahlung radiation and impurity ionization, recombination, and radiation rates using a model in which the density of each charge state is advanced separately. The integrated model presented here allows the independent evolution of electron and ion temperatures, which is necessary to accurately model cases where the electron temperature drops more quickly than the electron-ion thermal equilibration time. This model is used to simulate the disruption of a model NSTX discharge caused by the introduction of argon impurities, using physically realistic resistivity. Despite well-mixed impurities, contraction of the current channel is found to lead to magnetohydrodynamic instabilities that result in stochastization of the magnetic field, a fast thermal quench, and localized parallel electric fields that can exceed the axisymmetric values by a factor of five for brief periods.

Authors:
 [1];  [2];  [3];  [2];  [1]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. General Atomics, San Diego, CA (United States)
  3. SLs2 Consulting, San Diego, CA (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1480324
Grant/Contract Number:  
AC02-05CH11231; AC02-09CH11466; FG02-95ER54309
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Name: Nuclear Fusion; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; tokamaks; disruptions; disruption mitigation

Citation Formats

Ferraro, N., Lyons, Brendan C., Kim, Charlson C., Liu, Yue -Qiang, and Jardin, Stephen C. 3D two-temperature magnetohydrodynamic modeling of fast thermal quenches due to injected impurities in tokamaks. United States: N. p., 2018. Web. doi:10.1088/1741-4326/aae990.
Ferraro, N., Lyons, Brendan C., Kim, Charlson C., Liu, Yue -Qiang, & Jardin, Stephen C. 3D two-temperature magnetohydrodynamic modeling of fast thermal quenches due to injected impurities in tokamaks. United States. doi:10.1088/1741-4326/aae990.
Ferraro, N., Lyons, Brendan C., Kim, Charlson C., Liu, Yue -Qiang, and Jardin, Stephen C. Fri . "3D two-temperature magnetohydrodynamic modeling of fast thermal quenches due to injected impurities in tokamaks". United States. doi:10.1088/1741-4326/aae990.
@article{osti_1480324,
title = {3D two-temperature magnetohydrodynamic modeling of fast thermal quenches due to injected impurities in tokamaks},
author = {Ferraro, N. and Lyons, Brendan C. and Kim, Charlson C. and Liu, Yue -Qiang and Jardin, Stephen C.},
abstractNote = {Here, an integrated model for the ionization, radiation, and advection of impurities in the extended-magnetohydrodynamic code M3D-C1 is described. This implementation makes use of the KPRAD model, which calculates bremsstrahlung radiation and impurity ionization, recombination, and radiation rates using a model in which the density of each charge state is advanced separately. The integrated model presented here allows the independent evolution of electron and ion temperatures, which is necessary to accurately model cases where the electron temperature drops more quickly than the electron-ion thermal equilibration time. This model is used to simulate the disruption of a model NSTX discharge caused by the introduction of argon impurities, using physically realistic resistivity. Despite well-mixed impurities, contraction of the current channel is found to lead to magnetohydrodynamic instabilities that result in stochastization of the magnetic field, a fast thermal quench, and localized parallel electric fields that can exceed the axisymmetric values by a factor of five for brief periods.},
doi = {10.1088/1741-4326/aae990},
journal = {Nuclear Fusion},
issn = {0029-5515},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on October 19, 2019
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