Investigation on Large-Amplitude Ion-Acoustic Shock in Negative Ion Plasma

Abstract

Evolution of large-amplitude ion-acoustic shock in plasma containing electrons, $\text {Ar}^{+}$ and $\text {F}^{-}$ ions, has been investigated. As for the extremely high-amplitude shock wave in multicomponent plasma with negative ions, we achieved a density perturbation of ~70%, in contrast to the ~15% density perturbation observed in an electron-ion plasma. The numerical results of well-known Korteweg-de Vries (KdV)–Burger equation were employed in order to compare our exquisite observations. Furthermore, we explore the impact of enhanced Landau damping on the large-amplitude shocks in the plasma containing negative ions. The negative-to-positive ion density ratio is kept at approximately $r(=n_{-}{/}{n}_{+})\sim 0.25$ .