Cold-hot coupled waves in a flowing magnetized plasma

Uk Lee, Min; Ji, Jeong-Young; Yun, Gunsu S.

doi:10.1088/1741-4326/abb61a

Title: Cold-hot coupled waves in a flowing magnetized plasma

Journal Article · Wed Oct 21 00:00:00 EDT 2020 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/abb61a· OSTI ID:1849566

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Abstract Nonlinear coupling of cold and hot waves in a flowing magnetized plasma is analyzed with the Vlasov equation. An analytical solution is obtained for cold waves of a small amplitude (weak flow) and a long wavelength. The distribution function is obtained by integrating the kinetic equation along a perturbed phase-space trajectory for a time-varying plasma flow. The kinetic description presents a generalized dispersion relation that involves resonances depending on cold and hot wave dispersions. Coherent fluid motion leads to radiation peaks in addition to the cyclotron harmonics, where the wavenumber of the cold wave determines the peak frequencies. The peaks appear narrow when the wave propagates perpendicular to the time-averaged flow while they become broad due to the Doppler effect when the wave propagates parallel to the flow. Fully kinetic particle-in-cell simulations corroborate the theoretical predictions. The dispersion relation and resulting wave spectra provide information about plasma parameters and flow properties.

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Research Organization:: Utah State Univ., Logan, UT (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: FG02-04ER54746

OSTI ID:: 1849566

Journal Information:: Nuclear Fusion, Vol. 60, Issue 12; ISSN 0029-5515

Publisher:: IOP Science

Country of Publication:: United States

Language:: English

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