Speaker
Seyyed Mehdi Hosseini Jenab
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P5.4013.pdf
Study of Sagdeev solutions and their stability against mutual collisions
in the ion-acoustic regime based on fully kinetic simulation
S. M. Hosseini Jenab, G. Brodin
1 Department of Physics, Umeå University, Sweden
The Sagdeev pseudo-potential method [3] has been used in studying in a range of plasmas in
order to find nonlinear solutions to the system. In this study, we have focused on the collision
of these solutions in the ion-acoustic regime. The objective is to establish if the Sagdeev so-
lutions can be considered as proper solitons in a fully kinetic regime[1, 2]. By following their
temporal evolutions in the kinetic simulation box, we have tested their stability against mutual
collisions. The study utilizes a fully kinetic simulation approach and adopts the Vlasov equa-
tion to follow the temporal evolution of plasma constituents. The numerical approach to solve
the Vlasov-Poisson set of equation is based on Vlasov-Hybrid simulation (VHS) method which
follows phase points trajectories in the phase space and guarantees the positiveness of the dis-
tribution function. In order to reproduce the potential profile of the solitons as the initial state of
simulations, the Sagdeev pseudo-potential approach is employed numerically. It is shown that
the ions’ dynamics (specifically the reflected population) have a strong effect on the collision
process.
References
[1] H. Abbasi, S. M. Hosseini Jenab, and H. H. Pajouh. Preventing the recurrence effect in the vlasov simulation
by randomizing phase-point velocities in phase space. Physical Review E, 84(3):036702, 2011.
[2] S. M. Hosseini Jenab and F. Spanier. Fully kinetic simulation study of ion-acoustic solitons in the presence of
trapped electrons. Physical Review E, 95(5):053201, 2017.
[3] R. Sagdeev. Cooperative phenomena and shock waves in collisionless plasmas. Rev plasma phys, 4:23, 1966.
