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- W2389341954 abstract "A shear Alfv'en wave parametric instability is observed for the first time in the laboratory. When a single finite $omega/Omega_i$ kinetic Alfv'en wave (KAW) is launched in the Large Plasma Device above a threshold amplitude, three daughter modes are produced. These daughter modes have frequencies and parallel wave numbers that are consistent with copropagating KAW sidebands and a low frequency nonresonant mode. The observed process is parametric in nature, with the frequency of the daughter modes varying as a function of pump wave amplitude. The daughter modes are spatially localized on a gradient of the pump wave magnetic field amplitude in the plane perpendicular to the background field, suggesting that perpendicular nonlinear forces (and therefore $k_{perp}$ of the pump wave) play an important role in the instability process. Despite this, modulational instability theory with $k_{perp}=0$ has several features in common with the observed nonresonant mode and Alfv'en wave sidebands." @default.
- W2389341954 created "2016-06-24" @default.
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- W2389341954 date "2016-05-11" @default.
- W2389341954 modified "2023-09-27" @default.
- W2389341954 title "Observation of an Alfvén Wave Parametric Instability in a Laboratory Plasma" @default.
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- W2389341954 doi "https://doi.org/10.1103/physrevlett.116.195002" @default.
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