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Production of large volume, strongly magnetized laser-produced plasmas by use of pulsed external magnetic fields
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Photograph of the pulsed power system, (b) the split coil is incorporated in a stainless steel flange and remains at air, which gives advantage to high-voltage insulation, cooling, and simplifies the construction of current feedthroughs. The transmission line that is connected to the pulsed power unit is seen to exit the re-entrant assembly.

Image of FIG. 2.
FIG. 2.

(a) Sketch of the split coil contained in the re-entrant tubing and contained in the laser experimental target chamber, (b) sketch of the implantation of the coil in the ELFIE laser target chamber.

Image of FIG. 3.
FIG. 3.

Global electrical scheme of the pulser and the coil system, including the Rogowski probe.

Image of FIG. 4.
FIG. 4.

Typical discharge in the coil for 6 kV, 5 kV, and 3 kV applied voltages.

Image of FIG. 5.
FIG. 5.

(a) B(T) vs radius and (b) B(T) in the longitudinal direction for a 12 kV applied voltage.

Image of FIG. 6.
FIG. 6.

Evolution of the split coil temperature.

Image of FIG. 7.
FIG. 7.

Overall structure of the ELFIE laser facility at Ecole Polytechnique.

Image of FIG. 8.
FIG. 8.

Experimental setup.

Image of FIG. 9.
FIG. 9.

Transverse probing (raw interferometric data) obtained following the irradiation of a Cu 250 μm thick foil by a 500 ps duration laser focused using a RPP focal spot (diameter of ∼750 μm FWHM) and at an intensity of ∼1 × 1012 W cm−2. The images are taken 5 ns after the beginning of the interaction (a) without external magnetic field and (b) with a 20 T magnetic field added parallel to the plasma expansion axis. Plasma density computed using Abel inversion 19 (c) for the image shown in of (a) and (d) for the image shown in (b).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Production of large volume, strongly magnetized laser-produced plasmas by use of pulsed external magnetic fields