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Ballistic and snowplow regimes in plasma acceleration
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10.1063/1.3081550
/content/aip/journal/pop/16/3/10.1063/1.3081550
http://aip.metastore.ingenta.com/content/aip/journal/pop/16/3/10.1063/1.3081550

Figures

Image of FIG. 1.
FIG. 1.

Coaxial plasma jet accelerator (adapted from Ref. 2). The plasma jet originates at the left and accelerates axially to the right due to the force.

Image of FIG. 2.
FIG. 2.

Schematic figure of 1D Cartesian plasma jet simulation. The magnetic field on the left diffuses into the conductive plasma which is accelerated to the right by the resulting force. In the 1D geometry the direction corresponds to the axial direction in Fig. 1.

Image of FIG. 3.
FIG. 3.

Snapshots (at ) of (a) , and (b) ion, and (c) electron phase-space particle densities for 1D kinetic plasma jet simulation A (see Table I for parameters).

Image of FIG. 4.
FIG. 4.

Average ion axial velocity as a function of time for simulation A.

Image of FIG. 5.
FIG. 5.

Snapshots of ion particle phase-space charge density at (a) , (b) 25, (c) 50, and (d) 75 ns for simulation A. The contour levels are the same, as shown in Fig. 3.

Image of FIG. 6.
FIG. 6.

Snapshots of ion particle phase-space charge density at (a) , (b) 125, (c) 150, and (d) 175 ns for simulation A. The contour levels are the same, as shown in Fig. 3.

Image of FIG. 7.
FIG. 7.

Snapshot of magnetic field profile at for simulation A.

Image of FIG. 8.
FIG. 8.

Sheath edge and mean plasma position as a function of time for simulation A. The coordinate system in this plot has been adjusted so that .

Image of FIG. 9.
FIG. 9.

Schematic of idealized ion phase-space data. The velocity scale and time scales are defined in the text.

Image of FIG. 10.
FIG. 10.

Schematic of the “cycle” of idealized ion phase-space data .

Image of FIG. 11.
FIG. 11.

Idealized ion dynamics model results showing , , and as functions of time.

Image of FIG. 12.
FIG. 12.

Sheath position as a function of time for simulations with varying values of . Simulation parameters are given in Table I.

Image of FIG. 13.
FIG. 13.

Snapshots (at ) of (a) , and (b) ion and (c) electron phase-space particle densities for 1D kinetic plasma jet simulation B (see Table I for parameters).

Image of FIG. 14.
FIG. 14.

Detailed view in the sheath region of normalized ion mean velocity and magnetic field at for simulation A.

Image of FIG. 15.
FIG. 15.

Calculated sheath thickness as a function of time for simulations with varying values of . Simulation parameters are given in Table I. Note that simulations A and F have the same value of , but differing values for the linear ramp duration on the input power.

Tables

Generic image for table
Table I.

Parameters used in 1D plasma jet simulations. For all simulations the initial ion and electron temperature are 5 eV. is the vacuum field value, and is the initial (uniform) plasma number density. The Alfvén velocity is calculated from and using Eq. (2).

Generic image for table
Table II.

Theory results from input parameters of 1D plasma jet simulations. Ion phase-space data from simulation A is shown in Fig. 3. Results from simulation B are shown in Fig. 13.

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/content/aip/journal/pop/16/3/10.1063/1.3081550
2009-03-10
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Ballistic and snowplow regimes in J×B plasma acceleration
http://aip.metastore.ingenta.com/content/aip/journal/pop/16/3/10.1063/1.3081550
10.1063/1.3081550
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