Abstract Details
Abstracts
Author: Boris Breizman
Requested Type: Consider for Invited
Submitted: 2026-03-06 19:45:31
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Contact Info:
Institute for Fusion Studies, UT Austin
2515 Speedway C1500
AUSTIN, Texas 78712
US
Abstract Text:
Energetic-particle-driven instabilities in plasmas commonly modify the particle distribution function to establish a balance between the instability drive and the wave-damping rate. This balance can last long in the presence of particle sources and sinks. In such situations, a stationary spectrum of turbulence and the distorted distribution of particles need to be determined self-consistently. The idealized one-dimensional descriptions of such systems do not generally apply to two- or three-dimensional systems of practical interest, which calls for more relevant theoretical modeling. This talk shows that the stationary spectra of turbulence in such systems do not occupy two- or three-dimensional areas in phase space but reside on lines or surfaces and look like a mountain crest. A recent example is in Ref. [1], presenting a quasilinear theory for stationary whistler turbulence driven by runaway electrons. Such stationary spectra also form when stimulated scattering on plasma ions balances the excitation of plasma waves by a relativistic elec-tron beam [2]. Technically, the crested nature of the wave spectrum reduces the dimensionality of the problem and facilitates a self-consistent description of the turbulence and its impact on the driving elec-trons, both analytically [1, 2] and numerically [3].
[1] B.N. Breizman and D.I. Kiramov, Marginal stability constraint on runaway electron distribution,
Physics of Plasmas 30, 022301(2023).
[2] B.N. Breizman, V.E Zakharov, and S.L. Musher, Kinetics of Stimulated Scattering of Langmuir
Waves by Plasma Ions, Soviet Physics JETP 37, 658 (1973).
[3] K. Huang and B. N. Breizman, The marginally stable state of runaway electrons controlled by self-
excited waves, Poster presentation 1P060 at the 51st EPS Conference on Plasma Physics (Vilnius, Lithuania,
July 7-11, 2025).
Characterization: 4.0
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