Compressional Alfvén eigenmodes excited by runaway electrons
Abstract
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.
- Authors:
-
[1];
[2];
[3];
[4];
[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)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
- OSTI Identifier:
- 1779902
- Grant/Contract Number:
- AC02-09CH11466; SC0016268
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 61; Journal Issue: 3; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Liu, Chang, Brennan, Dylan P., Lvovskiy, Andrey, Paz-Soldan, Carlos, Fredrickson, Eric D., and Bhattacharjee, Amitava. Compressional Alfvén eigenmodes excited by runaway electrons. United States: N. p., 2021.
Web. doi:10.1088/1741-4326/abcfcf.
Liu, Chang, Brennan, Dylan P., Lvovskiy, Andrey, Paz-Soldan, Carlos, Fredrickson, Eric D., & Bhattacharjee, Amitava. Compressional Alfvén eigenmodes excited by runaway electrons. United States. https://doi.org/10.1088/1741-4326/abcfcf
Liu, Chang, Brennan, Dylan P., Lvovskiy, Andrey, Paz-Soldan, Carlos, Fredrickson, Eric D., and Bhattacharjee, Amitava. Mon .
"Compressional Alfvén eigenmodes excited by runaway electrons". United States. https://doi.org/10.1088/1741-4326/abcfcf. https://www.osti.gov/servlets/purl/1779902.
@article{osti_1779902,
title = {Compressional Alfvén eigenmodes excited by runaway electrons},
author = {Liu, Chang and Brennan, Dylan P. and Lvovskiy, Andrey and Paz-Soldan, Carlos and Fredrickson, Eric D. and Bhattacharjee, Amitava},
abstractNote = {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.},
doi = {10.1088/1741-4326/abcfcf},
journal = {Nuclear Fusion},
number = 3,
volume = 61,
place = {United States},
year = {Mon Feb 01 00:00:00 EST 2021},
month = {Mon Feb 01 00:00:00 EST 2021}
}
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