Shifting and Splitting of Resonance Lines due to Dynamical Friction in Plasmas

Duarte, V.  N.; Lestz, J.  B.; Gorelenkov, N.  N.; White, R.  B.

doi:10.1103/physrevlett.130.105101

Shifting and Splitting of Resonance Lines due to Dynamical Friction in Plasmas

Journal Article · Thu Mar 09 00:00:00 EST 2023 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.130.105101· OSTI ID:1963012

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Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
University of California, Irvine, CA (United States)

We report a quasilinear plasma transport theory that incorporates Fokker-Planck dynamical friction (drag) and pitch angle scattering is self-consistently derived from first principles for an isolated, marginally unstable mode resonating with an energetic minority species. It is found that drag fundamentally changes the structure of the wave-particle resonance, breaking its symmetry and leading to the shifting and splitting of resonance lines. In contrast, scattering broadens the resonance in a symmetric fashion. Comparison with fully nonlinear simulations shows that the proposed quasilinear system preserves the exact instability saturation amplitude and the corresponding particle redistribution of the fully nonlinear theory. Even in situations in which drag leads to a relatively small resonance shift, it still underpins major changes in the redistribution of resonant particles. This novel influence of drag is equally important in plasmas and gravitational systems. In fusion plasmas, the effects are especially pronounced for fast-ion-driven instabilities in tokamaks with low aspect ratio or negative triangularity, as evidenced by past observations. The same theory directly maps to the resonant dynamics of the rotating galactic bar and massive bodies in its orbit, providing new techniques for analyzing galactic dynamics.

View Accepted Manuscript (DOE)

Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466; FC02-04ER54698; SC0020337

OSTI ID:: 1963012

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 10 Vol. 130; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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