Stability of beta-induced Alfvén eigenmodes (BAE) in DIII-D
Abstract
Although the stability of ellipticity, toroidal and reversed-shear Alfvén eigenmodes (EAE, TAE, RSAE) are relatively well understood, less is known about the stability of lower-frequency modes such as the beta-induced Alfvén eigenmode (BAE) but, because they are often unstable in present devices and are implicated in fast-ion transport, understanding their stability is vital. BAE stability is studied in primarily weak or reversed shear DIII-D plasmas with sub-Alfvénic deuterium beams. Modes are classified based on electron cyclotron emission, beam emission spectroscopy, magnetics, and interferometer data. The study is limited to the initial two seconds of the discharge, where the evolving q profile provides an effective scan of the dependence of stability upon q. In a dedicated experiment, BAEs are unstable at times in the discharge when the minimum of the safety factor qmin is close to a rational number. The observed mode frequencies are usually close to analytic estimates of the BAE accumulation point and the eigenfunction peaks in the vicinity of qmin. Unstable BAEs usually occur in bursts that chirp rapidly in frequency. To isolate the importance of thermal and beam gradients in driving the modes, the beam and electron cyclotron heating power is altered for 50–100 ms durations inmore »
- Authors:
-
[1];
[2];
[4];
[2];
[5];
[6]
- Univ. of California, Irvine, CA (United States)
- General Atomics, San Diego, CA (United States)
- Univ. of Texas, Austin, TX (United States)
- Univ. of California, Los Angeles, CA (United States)
- Univ. of Wisconsin, Madison, WI (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- General Atomics, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1784050
- Grant/Contract Number:
- FC02-04ER54698
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 61; Journal Issue: 6; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Heidbrink, W. W., Van Zeeland, M. A., Austin, M. E., Crocker, N. A., Du, X. D., McKee, G. R., and Spong, D. A. Stability of beta-induced Alfvén eigenmodes (BAE) in DIII-D. United States: N. p., 2021.
Web. doi:10.1088/1741-4326/abf953.
Heidbrink, W. W., Van Zeeland, M. A., Austin, M. E., Crocker, N. A., Du, X. D., McKee, G. R., & Spong, D. A. Stability of beta-induced Alfvén eigenmodes (BAE) in DIII-D. United States. https://doi.org/10.1088/1741-4326/abf953
Heidbrink, W. W., Van Zeeland, M. A., Austin, M. E., Crocker, N. A., Du, X. D., McKee, G. R., and Spong, D. A. Tue .
"Stability of beta-induced Alfvén eigenmodes (BAE) in DIII-D". United States. https://doi.org/10.1088/1741-4326/abf953. https://www.osti.gov/servlets/purl/1784050.
@article{osti_1784050,
title = {Stability of beta-induced Alfvén eigenmodes (BAE) in DIII-D},
author = {Heidbrink, W. W. and Van Zeeland, M. A. and Austin, M. E. and Crocker, N. A. and Du, X. D. and McKee, G. R. and Spong, D. A.},
abstractNote = {Although the stability of ellipticity, toroidal and reversed-shear Alfvén eigenmodes (EAE, TAE, RSAE) are relatively well understood, less is known about the stability of lower-frequency modes such as the beta-induced Alfvén eigenmode (BAE) but, because they are often unstable in present devices and are implicated in fast-ion transport, understanding their stability is vital. BAE stability is studied in primarily weak or reversed shear DIII-D plasmas with sub-Alfvénic deuterium beams. Modes are classified based on electron cyclotron emission, beam emission spectroscopy, magnetics, and interferometer data. The study is limited to the initial two seconds of the discharge, where the evolving q profile provides an effective scan of the dependence of stability upon q. In a dedicated experiment, BAEs are unstable at times in the discharge when the minimum of the safety factor qmin is close to a rational number. The observed mode frequencies are usually close to analytic estimates of the BAE accumulation point and the eigenfunction peaks in the vicinity of qmin. Unstable BAEs usually occur in bursts that chirp rapidly in frequency. To isolate the importance of thermal and beam gradients in driving the modes, the beam and electron cyclotron heating power is altered for 50–100 ms durations in reproducible discharges. As expected from the resonance condition, BAEs depend sensitively on the beam power and injection geometry. Modes only persist for ~25 ms because the anisotropic beam population only interacts strongly with the modes over a relatively narrow range of q. Lastly, a database of over 1000 beam-heated discharges shows that BAEs are more likely to be unstable when the poloidal beta exceeds 0.5.},
doi = {10.1088/1741-4326/abf953},
journal = {Nuclear Fusion},
number = 6,
volume = 61,
place = {United States},
year = {Tue May 18 00:00:00 EDT 2021},
month = {Tue May 18 00:00:00 EDT 2021}
}
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