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Kinetics of ions during the development of parametric instability of intensive Langmuir waves in plasma | A.V. Kirichok
; V.M. Kuklin
; A.V. Pryjmak
; A.G. Zagorodny
; | Date: |
12 Nov 2014 | Abstract: | Nonlinear regimes of one-dimensional parametric instabilities of long-wave
plasma waves are considered for the cases when the average plasma field energy
density is less (Zakharov’s model) or greater (Silin’s model) than the plasma
thermal energy density. The hybrid models presented in this paper treat the
electrons as a fluid by way of an equation for the high-frequency wave and
treat the ions kinetically with a super-particle simulation. This makes
possible consideration of non-resonant particles trapped by high-frequency
oscillations and the influence of trajectory crossing on the development of the
parametric instability. The evolution of ion energy distribution is studied. It
is shown that after saturation of the instability, the ion kinetic energy
density normalized to the initial field energy density is of the order of the
ratio of linear growth rate to the plasma frequency, for the case when the
initial field energy far exceeds the plasma thermal energy. In this case, the
ion energy distribution is different from the Maxwellian.In the opposite case
of hot plasma, the ions acquire a part of initial field energy, which is
approximately equal to the half of ratio of initial Langmuir field energy to
the plasma thermal energy. At this, the ion kinetic energy distribution is
close to the Maxwellian, and it is reasonably to speak about ion temperature.
The crossing of ion trajectories in the surrounding of density cavities is a
reason of instability quenching in both cases. | Source: | arXiv, 1411.3011 | Services: | Forum | Review | PDF | Favorites |
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