Abstract:
It has been shown that the nonresonant three-wave interaction between daughter waves trapped in the plasma, which excites strongly damped induced oscillations, strongly affects the nonlinear evolution of the low-threshold parametric decay instability, leading to its saturation through a cascade of successive low-threshold decays. As a result, the anomalous absorption of a microwave pump wave in the electron cyclotron heating of the plasma in toroidal magnetic confinement devices can be significantly reduced.
This work was supported by the Russian Science Foundation (project no. 22-12-00010, analytical study of the instability and its saturation) and by the Ministry of Science and Higher Education of the Russian Federation (state contract no. 0040-2019-0023 for the Ioffe Institute, numerical simulation, and state contract no. 0034-2021-0003 for the Ioffe Institute, development of the code to simulate the instability saturation).
Citation:
E. Z. Gusakov, A. Yu. Popov, “On a strong effect of nonresonant three-wave interactions on the saturation of low-threshold parametric decay instability”, Pis'ma v Zh. Èksper. Teoret. Fiz., 116:1 (2022), 41–45; JETP Letters, 116:1 (2022), 36–40