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Numerical studies of the effects of precursor plasma on the performance of wire-array Z-pinches
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10.1063/1.3430633
/content/aip/journal/pop/17/6/10.1063/1.3430633
http://aip.metastore.ingenta.com/content/aip/journal/pop/17/6/10.1063/1.3430633

Figures

Image of FIG. 1.
FIG. 1.

The simulated implosion (a) trajectories and (b) velocities of outer boundary of the shells, (c) convergence ratios and (d) x-ray powers in the two cases prefilled and un-prefilled low-density plasma inside the shells. The same driven current is presented in (d) for the two cases.

Image of FIG. 2.
FIG. 2.

The simulated evolutions of mass density profiles (a) with and (b) without the precursor plasma inside the shell.

Image of FIG. 3.
FIG. 3.

The simulated variations of velocities (dotted line) of the boundary of the shells and the magnetic Reynolds number (solid line) of the 100th mesh, with time, (a) prefilled and (b) un-prefilled low-density plasma inside the shells.

Image of FIG. 4.
FIG. 4.

The simulated evolutions of [(a) and (b)] magnetic field and [(c) and (d)] current density, where (a) and (c) are the cases with prefilled plasma, while (b) and (d) are without.

Image of FIG. 5.
FIG. 5.

The simulated evolutions of the magnetic Reynolds number in Lagrangian coordinates, (a) with and (b) without the prefilled plasma inside the shells. Solid line: 2.4 ns, dashed line: 30 ns, dashed-dotted line: 80 ns, dotted line: 126 ns (a), 130 ns (b), dashed-dotted-dotted line: 140 ns.

Image of FIG. 6.
FIG. 6.

(a) The convergence ratios and (b) x-ray powers in several cases, in which the masses of the prefilled plasma inside the shell are assumed to be 7%, 14%, 21%, 42%, and 63% of the load mass, respectively.

Image of FIG. 7.
FIG. 7.

The supposed velocity profile of the precursor, ablated, and coronal plasmas.

Image of FIG. 8.
FIG. 8.

The variations in driven current and the total ablated wire-array masses with time, based on Lebedev’s and Sasorov’s models.

Image of FIG. 9.
FIG. 9.

The mass density profiles of the precursor and corona plasmas at different time.

Image of FIG. 10.
FIG. 10.

The magnetic field profiles in the precursor and corona plasmas at different time.

Image of FIG. 11.
FIG. 11.

The calculated implosion trajectory of the outer boundary and convergence ratio.

Image of FIG. 12.
FIG. 12.

The calculated x-ray power. The driven current is shown again.

Image of FIG. 13.
FIG. 13.

The calculated profiles of mass density at a few times.

Image of FIG. 14.
FIG. 14.

The calculated plasma velocities at a few times.

Image of FIG. 15.
FIG. 15.

The calculated temperature evolutions of (a) electron, (b) ion, and (c) radiation.

Image of FIG. 16.
FIG. 16.

The calculated evolutions of (a) magnetic field and (b) corresponding current density.

Image of FIG. 17.
FIG. 17.

The calculated evolution of magnetic Reynolds number in Lagrangian coordinates.

Image of FIG. 18.
FIG. 18.

The calculated profiles of the plasma velocity in the plasma shell implosion with the precursor of 21% of the load mass at 68.3 and 92.6 ns.

Image of FIG. 19.
FIG. 19.

Comparisons of the convergence ratios and x-ray powers between the two implosion concepts started from a plasma shell and from the wire-array ablation, in which the flow velocity of the precursor plasma varies from to .

Image of FIG. 20.
FIG. 20.

The simulated evolutions of the products of the electron gyrofrequency and the electron-ion collision time, (a) implosion started from wire-array ablation driven by the current of 3 MA level, implosions of the plasma shell with prefilled low-density plasma inside the shell driven by the currents of (b) 3 and (c) 9 level.

Image of FIG. 21.
FIG. 21.

The driven current of 9 MA level and the x-ray powers in the implosions of plasma shells with and without the prefill inside the shells.

Tables

Generic image for table
Table I.

The effects of ablation time on the Z-pinch performance.

Generic image for table
Table II.

The effects of artificially modified mass ablation rate on the Z-pinch performance.

Generic image for table
Table III.

The effects of the ablation plasma velocity on the Z-pinch performance.

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/content/aip/journal/pop/17/6/10.1063/1.3430633
2010-06-17
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Numerical studies of the effects of precursor plasma on the performance of wire-array Z-pinches
http://aip.metastore.ingenta.com/content/aip/journal/pop/17/6/10.1063/1.3430633
10.1063/1.3430633
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