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

Ferraro, N.; Lyons, Brendan C.; Kim, Charlson C.; Liu, Yue -Qiang; Jardin, Stephen C.

doi:10.1088/1741-4326/aae990

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

Journal Article · Fri Oct 19 00:00:00 EDT 2018 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/aae990· OSTI ID:1480324

Ferraro, N. ^[1]; Lyons, Brendan C. ^[2]; Kim, Charlson C. ^[3]; Liu, Yue -Qiang ^[2]; Jardin, Stephen C. ^[1]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
General Atomics, San Diego, CA (United States)
SLs2 Consulting, San Diego, CA (United States)

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.

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Research Organization:: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-05CH11231; AC02-09CH11466; FG02-95ER54309

OSTI ID:: 1480324

Journal Information:: Nuclear Fusion, Vol. 59, Issue 1; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 25 works

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Cited By (3)

Shattered pellet injection simulations with NIMROD Kim, Charlson C.; Liu, Yueqiang; Parks, Paul B. Physics of Plasmas, Vol. 26, Issue 4 https://doi.org/10.1063/1.5088814	journal	April 2019
Axisymmetric simulations of vertical displacement events in tokamaks: A benchmark of M3D-C ¹ , NIMROD, and JOREK Krebs, I.; Artola, F. J.; Sovinec, C. R. Physics of Plasmas, Vol. 27, Issue 2 https://doi.org/10.1063/1.5127664	journal	February 2020
Axisymmetric benchmarks of impurity dynamics in extended-magnetohydrodynamic simulations Lyons, B. C.; Kim, C. C.; Liu, Y. Q. Plasma Physics and Controlled Fusion, Vol. 61, Issue 6 https://doi.org/10.1088/1361-6587/ab0e42	journal	April 2019

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