Multiscale Chirping Modes Driven by Thermal Ions in a Plasma with Reactor-Relevant Ion Temperature
Artikel i vetenskaplig tidskrift, 2021

A thermal ion driven bursting instability with rapid frequency chirping, considered as an Alfvenic ion temperature gradient mode, has been observed in plasmas having reactor-relevant temperature in the DIII-D tokamak. The modes are excited over a wide spatial range from macroscopic device size to microturbulence size and the perturbation energy propagates across multiple spatial scales. The radial mode structure is able to expand from local to global in similar to 0.1 ms and it causes magnetic topology changes in the plasma edge, which can lead to a minor disruption event. Since the mode is typically observed in the high ion temperature greater than or similar to 10 keV and high-beta plasma regime, the manifestation of the mode in future reactors should be studied with development of mitigation strategies, if needed. This is the first observation of destabilization of the Alfven continuum caused by the compressibility of ions with reactor-relevant ion temperature.


X. D. Du

General Atomics

R. J. Hong

University of California at Los Angeles

W. W. Heidbrink

University of California at Irvine (UCI)

X. Jian

University of California

H. Wang

General Atomics

N. W. Eidietis

University of California at Los Angeles

M. A. Van Zeeland

General Atomics

M. E. Austin

The University of Texas at Austin

Y. Liu

General Atomics

N. A. Crocker

University of California at Los Angeles

T. L. Rhodes

University of California at Los Angeles

Konsta Särkimäki

Chalmers, Fysik, Subatomär, högenergi- och plasmafysik

A. Snicker


W. Wu

General Atomics

M. Knolker

General Atomics

Physical Review Letters

0031-9007 (ISSN) 1079-7114 (eISSN)

Vol. 127 2 025001


Annan fysik

Fusion, plasma och rymdfysik

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