Neoclassical Tearing Mode Seeding by Nonlinear Three-Wave Interactions in Tokamaks

Bardóczi, L.; Logan, N. C.; Strait, E. J.

doi:10.1103/physrevlett.127.055002

Title: Neoclassical Tearing Mode Seeding by Nonlinear Three-Wave Interactions in Tokamaks

Journal Article · Fri Jul 30 00:00:00 UTC 2021 · Physical Review Letters

DOI: https://doi.org/10.1103/physrevlett.127.055002 · OSTI ID:1828671

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General Atomics, San Diego, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

We report the experimental observation of seed magnetic island formation by nonlinear three-wave coupling of magnetic island triplets. In this experiment, disruptive 2,1 islands are seeded by the coupling of 4,3 and 3,2 tearing modes to a central 1,1 sawtooth precursor. Three-wave interactions between these modes are conclusively identified by bispectral analysis, indicating fixed phase relationships in agreement with theory. Furthermore, this new observation of this seeding mechanism has important implications for future reactors that must operate in stable plasma equilibria, free of disruptive 2,1 islands.

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Research Organization:: General Atomics, San Diego, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

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

Grant/Contract Number:: AC52-07NA27344; FC02-04ER54698

OSTI ID:: 1828671

Report Number(s):: LLNL-JRNL--828234; 1042534

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 5 Vol. 127; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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