Phase-space dynamics of Alfvén mode chirping

White, R. B.; Duarte, V. N.; Gorelenkov, N. N.; Fredrickson, E. D.; Podesta, M.

doi:10.1063/5.0004610

Title: Phase-space dynamics of Alfvén mode chirping

Journal Article · 28 May 2020 · Physics of Plasmas

DOI: https://doi.org/10.1063/5.0004610 · OSTI ID:1643796

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Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

In tokamak discharges, toroidal Alfvén eigenmodes often experience complex semi-periodic frequency modulation known as chirping. These events modify the local high energy particle distribution and are expected to occur in many future fusion devices, which include energetic beams or fusion products. In this paper, we present a study of simulations of mode chirping made in order to better understand its phase-space properties in a realistic tokamak configuration. We find a mechanism that permits rapid repeated chirping with strong amplitude variation in each chirp. Each chirp is then associated with an amplitude crash to low magnitude and local manipulation of the density gradients through a shift of mode phase through π. The chirping produces high density clumps, which propagate down the fast ion density gradient and low density holes that propagate up the density gradient away from the resonance. This flow of particles across the resonance provides an energy source and local gradients for repeated chirping.

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 1643796

Journal Information:: Physics of Plasmas, Vol. 27, Issue 5; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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