Fig.? Time serise of electric field plot of run?.
Including hot ion component, other type of solitary potential structures moving upward exist. The wake of this type of solitary wave propagates rightward and upward in Fig.?. The velocity of this solitary wave is upward ion acoustic wave, which is dumped in two component simulation. At T = 3000, three potential drops exist near at x=190,x=330,and x=480. We call this type of potential drop type 2 weak double layer.
Fig.? charge density, ion density, electric field, electrostatic potential,
and ion phase space at T=3000. Three type 2 WDL are formed, and near x=470
a type 1 WDL is observed, then a potential profile of type 2 WDL at the vicinity
of type 1 WDL is modefied from that of normal type 2 WDL.
There are many differences between type 1 WDL and type 2 WDL in a spatial structure and other physical characteristics. An charge density spatial structure of type 2 WDL is negative- positive-negative triple charge layers,
Fig.? Contour plot of ion phase space density at t=2880, 2920, 2960, and 3000.
Contour plot of ion phase space density shows that solitary wave of type 2 WDL acts potential barrier against upward ion beam, and more ions are reflected dowmward region of the solitary wave. By similar process of potential barrier in case of type 1 WDL, type 2 WDL has net potential jump. A downward region has higher potential than an upward region, and this potential configuration accelerate electrons downward and ions upward.
Fig.? charge density, ion density, electric field, electrostatic potential,
and ion phase space at T=2600.
Fig.? Contour plot of ion phase space density at t=2560, 2600, 2640, and 2680.
