Journal
NUCLEAR FUSION
Volume 60, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1741-4326/ab90c8
Keywords
extraordinary microwave; upper hybrid wave; ion Bernstein wave; parametric decay instability; anomalous absorption of pump microwave
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Funding
- Ioffe Institute [16-12-10 043]
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We analyze the strong nonlinear regime of low power-threshold parametric decay instability (PDI) of a pump extraordinary wave. The PDI leads to the excitation of two upper hybrid (UH) waves only one of which is trapped in the vicinity of the local maximum of a non-monotonic density profile. The pump depletion and the multi-step secondary decays of the localized daughter UH wave are treated as the mechanisms leading to the instability saturation. It is shown that in the case of the even-step secondary cascade decay of trapped primary UH wave the pump wave depletion is responsible for the transition of a nonlinear phenomenon into a stationary regime, and the strong anomalous absorption is possible.
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