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Shock creation and particle acceleration driven by plasma expansion into a rarefied medium
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10.1063/1.3469762
/content/aip/journal/pop/17/8/10.1063/1.3469762
http://aip.metastore.ingenta.com/content/aip/journal/pop/17/8/10.1063/1.3469762

Figures

Image of FIG. 1.
FIG. 1.

The plasma state at the time . Panel (a) displays the electron distribution and (b) the proton distribution. Panel (b) shows also the time evolution of the protons throughout the simulation. The ten-logarithmic color scale corresponds to the number of computational particles. The electrostatic field modulus is shown in panel (c). (enhanced online). [URL: http://dx.doi.org/10.1063/1.3469762.1]10.1063/1.3469762.1

Image of FIG. 2.
FIG. 2.

The plasma state at the time . Panel (a) displays the electron distribution and (b) the proton distribution. The ten-logarithmic color scale corresponds to the number of computational particles. The electrostatic field modulus is shown in panel (c).

Image of FIG. 3.
FIG. 3.

Electron and proton density of the plasma at and [frames (a) and (b), respectively]; the densities are given in units of the density of the electrons or protons of the tenuous plasma.

Image of FIG. 4.
FIG. 4.

The plasma state at the time . Panel (a) displays the electron distribution and (b) the proton distribution. The ten-logarithmic color scale corresponds to the number of computational particles. The electrostatic field modulus is shown in panel (c).

Image of FIG. 5.
FIG. 5.

The plasma state at the time . Panel (a) displays the electron distribution and (b) the proton distribution. The ten-logarithmic color scale corresponds to the number of computational particles. The electrostatic field modulus is shown in panel (c).

Image of FIG. 6.
FIG. 6.

Zoom of the ten-logarithmic proton density distribution and modulus of the electric field at in correspondence to the start of the rarefaction wave region (a) and (b). A strong electric field, which intensity is comparable to the associated with the forward propagating shock, is associated with this wave. (c) and (d) display a rapidly oscillating wave moving along the rarefaction wave, just behind the downstream region of the shock. Finally, (e) and (f) represent a zoom of the shock region; behind the peak of the electric field in correspondence to the shock, a region of modulated electric field distribution is present, related to the shock downstream region.

Image of FIG. 7.
FIG. 7.

The plasma state at the time . Panel (a) shows the interval of the proton distribution containing the rarefaction wave and the shock. Overplotted is the proton density in units of the ion density of the tenuous plasma, which is divided by 4 for visualization purposes. The ten-logarithmic color scale is given in (a) and (b) in units of computational particles. Panel (b) show the related electron phase space; in order to better clarify the non Maxwellian behavior of it in panel (c), the normalized distribution function of the electrons is plotted on a linear scale.

Image of FIG. 8.
FIG. 8.

Panel (a) displays the proton maximum velocity as a function of time, whereas panel (b) shows the number of accelerated ions in time with overplotted a dependence for late times .

Image of FIG. 9.
FIG. 9.

Smoothed electrostatic field amplitude as a function of space and time. The propagation at a constant speed toward the positive direction of an electrostatic shock is clearly visible together with other secondary structures discussed in the text.

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/content/aip/journal/pop/17/8/10.1063/1.3469762
2010-08-19
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Shock creation and particle acceleration driven by plasma expansion into a rarefied medium
http://aip.metastore.ingenta.com/content/aip/journal/pop/17/8/10.1063/1.3469762
10.1063/1.3469762
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