Trapped Particle Effects in the Parametric Instability of Near-Acoustic Plasma Waves

Affolter, M.; Anderegg, F.; Dubin, D. H. E.; Valentini, F.; Driscoll, C. F.

doi:10.1103/physrevlett.121.235004

Title: Trapped Particle Effects in the Parametric Instability of Near-Acoustic Plasma Waves

Journal Article · 05 December 2018 · Physical Review Letters

DOI: https://doi.org/10.1103/physrevlett.121.235004 · OSTI ID:1611138

Affolter, M. ^[1]; Anderegg, F. ^[2]; Dubin, D. H. E. ^[2]; Valentini, F. ^[3]; Driscoll, C. F. ^[2]

Univ. of California at San Diego, La Jolla, CA (United States); DOE/OSTI
Univ. of California at San Diego, La Jolla, CA (United States)
Univ. della Calabria, Rende (Italy)

Quantitative experiments on the parametric decay instability of near-acoustic plasma waves provide strong evidence that trapped particles reduce the instability threshold below fluid models. At low temperatures, the broad characteristics of the parametric instability are determined by the frequency detuning of the pump and daughter wave, and the wave-wave coupling strength, surprisingly consistent with cold fluid, three-wave theories. Furthermore, at higher temperatures, trapped particle effects dominate, and the pump wave becomes unstable at half the threshold pump wave amplitude with similar exponential growth rates as for a cold plasma.

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Research Organization:: Univ. of California, San Diego, CA (United States); Oak Ridge Associated Univ., Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0008693; SC0014664

OSTI ID:: 1611138

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 23 Vol. 121; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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