Compressional Alfvén eigenmodes excited by runaway electrons

Liu, Chang; Brennan, Dylan P.; Lvovskiy, Andrey; Paz-Soldan, Carlos; Fredrickson, Eric D.; Bhattacharjee, Amitava

doi:10.1088/1741-4326/abcfcf

Compressional Alfvén eigenmodes excited by runaway electrons

Journal Article · Sun Jan 31 23:00:00 EST 2021 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/abcfcf· OSTI ID:1779902

^[1]; ^[2]; ^[3]; ^[4]; Fredrickson, Eric D. ^[1]; ^[5]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Princeton Univ., NJ (United States)
General Atomics, San Diego, CA (United States); Oak Ridge Associated Univ., Oak Ridge, TN (United States)
General Atomics, San Diego, CA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Princeton Univ., NJ (United States)

Compressional Alfvén eigenmodes (CAEs) driven by energetic ions have been observed in magnetic fusion experiments. In this paper, we show that the modes can also be driven by runaway electrons formed in post-disruption plasma, which may explain kinetic instabilities observed in DIII-D disruption experiments with massive gas injection. The spatial structure is calculated, as are the frequencies which are in agreement with experimental observations. Using a runaway electron distribution function obtained from a kinetic simulation, the mode growth rates are calculated and found to exceed the collisional damping rate when the runaway electron density exceeds a threshold value. The excitation of CAEs poses a new possible approach to mitigate seed runaway electrons during the current quench and surpassing the avalanche.

View Accepted Manuscript (DOE)

Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (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

Grant/Contract Number:: AC02-09CH11466; SC0016268

OSTI ID:: 1779902

Alternate ID(s):: OSTI ID: 23129629

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 3 Vol. 61; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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