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Stability and instability of Langmuir waves via active subspace decompositions

Mattingly, G.; Longaker, B.; Palmer, N. +2 more

We study the stability and instability of Langmuir waves propagating in a hot, unmagnetized plasma modeled by the Vlasov–Poisson system and encompassing a variety of velocity distributions, including perturbations of Lorentzian, Kappa, and incomplete Maxwellian steady states. The influence of both high-frequency spatial perturbations and physical …