Dust grain in streaming ions with temperature variation

  • S. Sundar


This work presents improved numerical observations to demonstrate influence of the ion-to-electrontemperature ratio on the dust grain in streaming non-Maxwellian ions for a range of ion speeds. Increasein electron-to-ion temperature ratio influences the ion-grain dynamics substantially and manifests itself asan enhancement in the wake amplitude. The interplay of streaming ion speed with temperature and theirsynergistic impact on the wake potential and density of the grain is discussed in detail. Physical propertieslike peak potential and peak position and its dependence on temperature, collision, and streaming speedsis presented. A comparison of the results obtained using 3D-6V particle-in-cell simulation with that of thelinear response approach is delineated systematically. At lower temperature, peak potential and peakposition exhibit monotonic increase with collision. However, at higher temperature the behavior becomesnon-monotonic and initially exhibits an increase in the peak potential with collision and then a decreasingtrend. For moderate streaming speeds at lower temperatures, splitting of ion focus behind grain isobserved from the density contours as well as three-dimensional potential plots. Our results arereasonably consistent with that of the earlier results reported using Linear Response formalism,nevertheless, in certain regimes it endows us with richer physics.
How to Cite
SUNDAR, S.. Dust grain in streaming ions with temperature variation. Physical Sciences and Technology, [S.l.], v. 5, n. 2, p. 16-22, jan. 2019. ISSN 2409-6121. Available at: <http://phst.kaznu.kz/index.php/journal/article/view/153>. Date accessed: 16 jan. 2019.
Plasma Physics and Related Technology