Observation of rapid frequency chirping instabilities driven by runaway electrons in a tokamak
Abstract
In this work, we report the first observation of chirping instabilities driven by runaway electrons (REs) in a tokamak. The instabilities are accessed during the post-disruption RE beam stage in a low density background plasma (n e < 10 19 m -3) on DIII-D. The chirping instabilities are observed when a decelerating loop voltage is applied to the RE beam. The frequency chirping is detected in two distinct frequency bands: 0.1–10 MHz and 30–80 MHz. The mode frequency increases linearly when the toroidal magnetic field sensed by the RE beam increases. The frequency chirps by 0.3–2.4 MHz on a timescale of 1 ms. Modification of the RE distribution function is directly measured during the chirping in the low-frequency band consistent with the hole–clump model for frequency chirping. The low-frequency instabilities also correlate with an increase of intermittent RE loss from the plasma. Lastly, these observations provide a novel experimental platform for fundamental studies of nonlinear chirping. They also support continued investigation of opportunities to utilize kinetic instabilities for RE mitigation in a tokamak reactor.
- Authors:
-
- Oak Ridge Associated Univ., Oak Ridge, TN (United States)
- Univ. of California, Irvine, CA (United States)
- General Atomics, San Diego, CA (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Università di Milano-Bicocca, Milan (Italy)
- Publication Date:
- Research Org.:
- General Atomics, San Diego, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1569036
- Alternate Identifier(s):
- OSTI ID: 1648937
- Grant/Contract Number:
- FC02-04ER54698; AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 59; Journal Issue: 12; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Lvovskiy, A., Heidbrink, W. W., Paz-Soldan, C., Spong, D. A., Dal Molin, A., Eidietis, N. W., Nocente, M., Shiraki, D., and Thome, K. E. Observation of rapid frequency chirping instabilities driven by runaway electrons in a tokamak. United States: N. p., 2019.
Web. doi:10.1088/1741-4326/ab4405.
Lvovskiy, A., Heidbrink, W. W., Paz-Soldan, C., Spong, D. A., Dal Molin, A., Eidietis, N. W., Nocente, M., Shiraki, D., & Thome, K. E. Observation of rapid frequency chirping instabilities driven by runaway electrons in a tokamak. United States. https://doi.org/10.1088/1741-4326/ab4405
Lvovskiy, A., Heidbrink, W. W., Paz-Soldan, C., Spong, D. A., Dal Molin, A., Eidietis, N. W., Nocente, M., Shiraki, D., and Thome, K. E. Thu .
"Observation of rapid frequency chirping instabilities driven by runaway electrons in a tokamak". United States. https://doi.org/10.1088/1741-4326/ab4405. https://www.osti.gov/servlets/purl/1569036.
@article{osti_1569036,
title = {Observation of rapid frequency chirping instabilities driven by runaway electrons in a tokamak},
author = {Lvovskiy, A. and Heidbrink, W. W. and Paz-Soldan, C. and Spong, D. A. and Dal Molin, A. and Eidietis, N. W. and Nocente, M. and Shiraki, D. and Thome, K. E.},
abstractNote = {In this work, we report the first observation of chirping instabilities driven by runaway electrons (REs) in a tokamak. The instabilities are accessed during the post-disruption RE beam stage in a low density background plasma (n e < 10 19 m -3) on DIII-D. The chirping instabilities are observed when a decelerating loop voltage is applied to the RE beam. The frequency chirping is detected in two distinct frequency bands: 0.1–10 MHz and 30–80 MHz. The mode frequency increases linearly when the toroidal magnetic field sensed by the RE beam increases. The frequency chirps by 0.3–2.4 MHz on a timescale of 1 ms. Modification of the RE distribution function is directly measured during the chirping in the low-frequency band consistent with the hole–clump model for frequency chirping. The low-frequency instabilities also correlate with an increase of intermittent RE loss from the plasma. Lastly, these observations provide a novel experimental platform for fundamental studies of nonlinear chirping. They also support continued investigation of opportunities to utilize kinetic instabilities for RE mitigation in a tokamak reactor.},
doi = {10.1088/1741-4326/ab4405},
journal = {Nuclear Fusion},
number = 12,
volume = 59,
place = {United States},
year = {Thu Sep 12 00:00:00 EDT 2019},
month = {Thu Sep 12 00:00:00 EDT 2019}
}
Web of Science
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