Nonlinear harmonics coupled by parallel wave propagations in a time-dependent plasma flow
- Pohang Univ. of Science and Technology, Gyeongbuk (Korea, Republic of); Utah State Univ., Logan, UT (United States)
- Pohang Univ. of Science and Technology, Gyeongbuk (Korea, Republic of)
- Utah State Univ., Logan, UT (United States)
In a time-dependent flow, nonlinear harmonics can be excited by coupling between linear waves and flow-induced harmonic waves. Examining the dispersion relations and selection rules for the coupling, we investigate nonlinearly coupled harmonics for waves propagating along the magnetic field line in a magnetized plasma, as well as waves in an unmagnetized plasma. The coupled harmonics in a plasma flow are described by analytic dispersion relations and selection rules. This nonlinear coupling is corroborated by the particle-in-cell simulation. Here, the coupled-harmonics model describes a mechanism for the excitation of nonlinear harmonics from linear waves in a time-dependent flow. The spectral analysis of the dispersion relation provides a useful way to evaluate the spatiotemporal behavior of a plasma flow.
- Research Organization:
- Utah State Univ., Logan, UT (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES); Korea Hydro & Nuclear; National Research Foundation of Korea (NRF) Power Co., Ltd; National Research Foundation of Korea (NRF)
- Grant/Contract Number:
- SC0022048; FG02-04ER54746; NRF-2019M1A7A1A03088456
- OSTI ID:
- 1863364
- Alternate ID(s):
- OSTI ID: 1907339; OSTI ID: 1907478
- Journal Information:
- Plasma Physics and Controlled Fusion, Vol. 64, Issue 5; ISSN 0741-3335
- Publisher:
- IOP ScienceCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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