Parametric excitation of Langmuir oscillations in a relativistic electron plasma

A systematic discussion is carried out of the parametric action of an external high-frequency field on a high-temperature plasma. The conditions for the onset of parametric resonance and the corresponding increments, as well as the frequency shift of the Langmuir oscillations under the action of a high-frequency field, are found.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 5, pp. 58–61, May, 1982.