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

Journal Article · · Physical Review Letters
 [1];  [2];  [2];  [3];  [2]
  1. Univ. of California at San Diego, La Jolla, CA (United States); DOE/OSTI
  2. Univ. of California at San Diego, La Jolla, CA (United States)
  3. 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.
Research Organization:
Oak Ridge Associated Univ., Oak Ridge, TN (United States); Univ. of California, San Diego, CA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC)
Grant/Contract Number:
SC0008693; SC0014664
OSTI ID:
1611138
Alternate ID(s):
OSTI ID: 1484550
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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