Parametric study of Alfvénic instabilities driven by runaway electrons during the current quench in DIII-D

Lvovskiy, A.; Paz-Soldan, C.; Eidietis, N. W.; Dal Molin, A.; DeGrandchamp, G. H.; Hollmann, E. M.; Lestz, J. B.; Liu, C.; Nocente, M.; Shiraki, D.; Du, X. D.

doi:10.1088/1741-4326/acb725

Title: Parametric study of Alfvénic instabilities driven by runaway electrons during the current quench in DIII-D

Journal Article · Wed Mar 01 00:00:00 EST 2023 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/acb725· OSTI ID:1959094

;

; Shiraki, D.;

To avoid or mitigate runaway electron (RE) beams in ITER, RE-driven instabilities are actively studied as a complimentary technique to massive material injection. In this work we report experimental dependencies of Alfvénic instabilities driven by REs during the current quench in DIII-D on plasma and material injection parameters. These instabilities, observed in the frequency range of 0.1–3 MHz, correlate with increased RE loss and thus may play a role in non-sustained RE beams. It was found that as the toroidal magnetic field ($$B_\mathrm {T}$$) decreases, the RE population becomes more energetic, the energy of instabilities increases, and no RE beam is observed when the maximum energy of REs exceeds 15 MeV (or when $$B_\mathrm {T}$$ is below 1.8 T). Analysis of disruptions at plasma core temperature ($$T_\mathrm {e}$$) of 1 keV and 8 keV shows that the RE population is much less energetic (with the maximum energy of only about 3 MeV) when $$T_\mathrm {e}$$ is high, and no instabilities are observed in this case. Besides disruptions above caused by Ar injection, cases with Ne and D₂ injections were also studied. Both Ne and D2 injections cause no sustained RE beams, however, for different reasons. Measurements of the instability polarization indicate that it is of predominantly compressional nature at the edge, which is consistent with modeling suggesting excitation of compressional Alfvén eigenmodes. However, drive of global Alfvén eigenmodes is also possible at low frequencies.

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Research Organization:: General Atomics, San Diego, CA (United States); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC02-09CH11466; FC02-04ER54698; FG02-07ER54917; SC0021624; SC0020337; SC0018270; AC05-00OR22725

OSTI ID:: 1959094

Alternate ID(s):: OSTI ID: 1922679; OSTI ID: 1961580; OSTI ID: 1963022; OSTI ID: 2281099

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Vol. 63 Journal Issue: 4; ISSN 0029-5515

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: IAEA

Language:: English

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