Chirping ion cyclotron emission (ICE) on NSTX-U

Fredrickson, E. D.; Gorelenkov, N. N.; Bell, R. E.; Diallo, A.; LeBlanc, B. P.; Lestz, J.; Podestà, M.

doi:10.1088/1741-4326/ac0164

Title: Chirping ion cyclotron emission (ICE) on NSTX-U

Journal Article · Fri Jul 09 00:00:00 EDT 2021 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ac0164· OSTI ID:1808313

Fredrickson, E. D. ^[1]; Gorelenkov, N. N. ^[1];

^[1];

^[1]; LeBlanc, B. P. ^[1]; Lestz, J. ^[1];

^[1]

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

In this work, we report on the discovery on NSTX-U of a qualitatively new type of non-thermal emission from plasmas in the ion-cyclotron frequency range (ICE). This new type of ICE is weakly damped, γ_damp/ω_ICE ≈ 0.14%, low order eigenmodes, excited by a fast ion population radially located near an internal transport barrier. The ICE appears as repetitive bursts with durations of ≈1 ms, and the bursts exhibit frequency chirps upwards and/or downwards with maximum δf/f ≈ 1%. We refer to this chirping ICE as ch-ICE. The bursts are longer than the typical ICE bursts of ≈100 μs reported previously for NSTX and NSTX-U, for simplicity, NSTX(-U). The chirping resembles that seen in modeling of weakly unstable fast particle driven instabilities (cf, Berk et al 1997 Phys. Lett. A 234 213). These data also provide some preliminary indications of non-linear coupling between the ch-ICE harmonics. Despite extensive experimental and theoretical studies of ICE, theoretical understanding of ICE remains qualitative at best. The detailed experimental observations of ICE from NSTX(-U) find a wide variation in the ICE characteristics. The new observations of ch-ICE presented here, combined with the characteristics of ICE on NSTX(-U) previously reported (Fredrickson et al 2019 Phys. Plasmas 26 032111), could guide the development of more complete theoretical models of ICE.

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

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Contributing Organization:: NSTX Team

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 1808313

Journal Information:: Nuclear Fusion, Vol. 61, Issue 8; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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