Volume 126, Number 1, April 2019
|Number of page(s)||7|
|Section||Physics of Gases, Plasmas and Electric Discharges|
|Published online||20 May 2019|
Observation of the strong anomalous absorption of the X-mode pump in a plasma filament due to the two-plasmon decay
1 Ioffe Institute - 26 Polytekhnicheskaya st., 194021 St.- Petersburg, Russia
2 Institute of Physics of NAS of Belarus - 68-2 Nezavisimostsi ave., 220072 Minsk, Belarus
Received: 27 December 2018
Accepted: 8 April 2019
The effect of strong anomalous absorption of the X-mode pump wave associated with the two-upper-hybrid-plasmon parametric decay is observed in a specially performed model experiment in a laboratory plasma. The strong microwave absorption takes place at the maximal plasma density higher than the upper-hybrid resonance value for the frequency equal to half of the pump frequency value. Its efficiency is determined at the level of 80% in the initial stage of the parametric decay instability saturation and 45% in the following steady state. The theoretical model of the two-upper-hybrid-plasmon decay in strongly inhomogeneous plasma is developed. The localization, threshold and growth rate of the instability are determined in agreement with experimental observations.
PACS: 52.35.-g – Waves, oscillations, and instabilities in plasmas and intense beams / 52.50.Sw – Plasma heating by microwaves; ECR, LH, collisional heating
© EPLA, 2019
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