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Efficient generation of $\omega _p$-radiation in a beam-driven thick plasma with oblique density modulation

Published online by Cambridge University Press:  09 June 2022

V.V. Glinskiy Open the ORCID record for V.V. Glinskiy [Opens in a new window] ,
I.V. Timofeev  and
V.V. Annenkov
V.V. Glinskiy*
Affiliation:
Budker Institute of Nuclear Physics SB RAS, 630090 Novosibirsk, Russia Novosibirsk State University, 630090 Novosibirsk, Russia
I.V. Timofeev
Affiliation:
Budker Institute of Nuclear Physics SB RAS, 630090 Novosibirsk, Russia
V.V. Annenkov
Affiliation:
Budker Institute of Nuclear Physics SB RAS, 630090 Novosibirsk, Russia Novosibirsk State University, 630090 Novosibirsk, Russia
*
†Email address for correspondence: [email protected]
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Abstract

Recent experiments on the collective interaction of gigawatt electron beams with plasma at the GOL-PET facility have shown that the power of the electromagnetic radiation at the plasma frequency increases tens of times if the starting plasma is created with quasiperiodic radial density gradients. One of the mechanisms capable of providing highly efficient conversion of an unstable beam-driven wave into an electromagnetic one in the presence of periodic density perturbations is the mechanism of plasma antenna. However, earlier this mechanism was considered only for strictly longitudinal modulation of the plasma density, when its efficiency dropped drastically if the transverse size of the plasma significantly exceeded the radiation wavelength. In this work, based on both analytical theory and particle-in-cell modelling, we will show that the presence of oblique modulation of the plasma density makes the antenna mechanism effective even in a thick plasma, if the long-wavelength satellite of the most unstable beam-driven wave falls into resonance with natural plasma oscillations.

Keywords

plasma simulationplasma wavesplasma instabilities
Type
Research Article
Information
Journal of Plasma Physics , Volume 88 , Issue 3 , June 2022 , 905880309
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Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press

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References

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