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Brochard G, Liu C, Wei X, Heidbrink W, Lin Z, Gorelenkov N, Chrystal C, Du X, Bao J, Polevoi AR, Schneider M, Kim SH, Pinches SD, Liu P, Nicolau JH, Lütjens H. Saturation of Fishbone Instability by Self-Generated Zonal Flows in Tokamak Plasmas. PHYSICAL REVIEW LETTERS 2024; 132:075101. [PMID: 38427884 DOI: 10.1103/physrevlett.132.075101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 09/15/2023] [Accepted: 11/09/2023] [Indexed: 03/03/2024]
Abstract
Gyrokinetic simulations of the fishbone instability in DIII-D tokamak plasmas find that self-generated zonal flows can dominate the nonlinear saturation by preventing coherent structures from persisting or drifting in the energetic particle phase space when the mode frequency down-chirps. Results from the simulation with zonal flows agree quantitatively, for the first time, with experimental measurements of the fishbone saturation amplitude and energetic particle transport. Moreover, the fishbone-induced zonal flows are likely responsible for the formation of an internal transport barrier that was observed after fishbone bursts in this DIII-D experiment. Finally, gyrokinetic simulations of a related ITER baseline scenario show that the fishbone induces insignificant energetic particle redistribution and may enable high performance scenarios in ITER burning plasma experiments.
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Affiliation(s)
- G Brochard
- ITER organisation, Route de Vinon-sur-Verdon, CS 90 046 13067 St., Paul Lez Durance, France
- Department of Physics and Astronomy, University of California, Irvine, California 92697, USA
| | - C Liu
- Princeton Plasma Physics Laboratory, Princeton University, P.O. Box 451, Princeton, New Jersey 08543,USA
| | - X Wei
- Department of Physics and Astronomy, University of California, Irvine, California 92697, USA
| | - W Heidbrink
- Department of Physics and Astronomy, University of California, Irvine, California 92697, USA
| | - Z Lin
- Department of Physics and Astronomy, University of California, Irvine, California 92697, USA
| | - N Gorelenkov
- Princeton Plasma Physics Laboratory, Princeton University, P.O. Box 451, Princeton, New Jersey 08543,USA
| | - C Chrystal
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA
| | - X Du
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA
| | - J Bao
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - A R Polevoi
- ITER organisation, Route de Vinon-sur-Verdon, CS 90 046 13067 St., Paul Lez Durance, France
| | - M Schneider
- ITER organisation, Route de Vinon-sur-Verdon, CS 90 046 13067 St., Paul Lez Durance, France
| | - S H Kim
- ITER organisation, Route de Vinon-sur-Verdon, CS 90 046 13067 St., Paul Lez Durance, France
| | - S D Pinches
- ITER organisation, Route de Vinon-sur-Verdon, CS 90 046 13067 St., Paul Lez Durance, France
| | - P Liu
- Department of Physics and Astronomy, University of California, Irvine, California 92697, USA
| | - J H Nicolau
- Department of Physics and Astronomy, University of California, Irvine, California 92697, USA
| | - H Lütjens
- CPHT, CNRS, École Polytechnique, Institut Polytechnique de Paris, Route de Saclay, 91128 Palaiseau, France
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