Stabilization of low-threshold two-plasmon parametric decay instability at oblique incidence of a microwave pump beam onto the plasma

It is shown that with an oblique incidence of a pump microwave in X2-mode electron cyclotron plasma heating (ECRH) experiments, the threshold power of a parametric decay instability (PDI) leading to excitation of two trapped upper hybrid waves increases and the anomalous absorption level decreases....

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Bibliographic Details
Published in:Physics of plasmas 2023-06, Vol.30 (6)
Main Authors: Gusakov, E. Z., Popov, A. Yu
Format: Article
Language:English
Subjects:
Cyclotrons
Decay
Plasma heating
Plasma physics
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Summary:It is shown that with an oblique incidence of a pump microwave in X2-mode electron cyclotron plasma heating (ECRH) experiments, the threshold power of a parametric decay instability (PDI) leading to excitation of two trapped upper hybrid waves increases and the anomalous absorption level decreases. It is proposed to use a small pump beam tilt along the magnetic field to suppress this most dangerous PDI, often observed in the X2-mode ECRH experiments.
ISSN:1070-664X
1089-7674
DOI:10.1063/5.0155945