The Plasma Focus

Rager, J. P.

doi:10.1007/978-1-4613-3470-5_8

Cited by 8 publications

(9 citation statements)

References 4 publications

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“…It is well known that, in plasma focus (PF) systems, the intensity of ionizing radiation emitted from the pinch region depends strongly on the pinch current I . In particular, the experimental neutron scaling based on measurements performed at facilities with a stored energy, W , from several units of kilojoules to a few hundred kilojoules has the form Y n ∼ I 3.2-5 [1][2][3]. For this energy range the scaling agrees well with another well-known experimental scaling Y n ∼ W 2 .…”

Section: Introductionsupporting

confidence: 67%

Experimental study of the structure of the plasma-current sheath on the PF-1000 facility

Krauz

Mitrofanov

Scholz

et al. 2012

Plasma Phys. Control. Fusion

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The results of studies of the plasma-current sheath structure on the PF-1000 facility in the stage close to the instant of pinch formation are presented. The measurements were performed using various modifications of the calibrated magnetic probes. Studies of the influence of the probe shape and dimensions on the measurements accuracy were done. The current flowing in the converging sheath at a distance of 40 mm from the axis of the facility electrodes was measured. In the optimal operating modes, this current is equal to the total discharge current, which indicates the high efficiency of current transportation toward the axis. In such shots a compact high-quality sheath forms with shock wave in front of the magnetic piston. It is shown that the neutron yield depends on the current compressed onto the axis. This dependence agrees well with the known scaling, Y n ∼ I 4 . The use of the total discharge current in constructing the current scaling, especially for facilities with a large stored energy, is unjustified.

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Section: Introductionsupporting

confidence: 67%

Experimental study of the structure of the plasma-current sheath on the PF-1000 facility

Krauz

Mitrofanov

Scholz

et al. 2012

Plasma Phys. Control. Fusion

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“…Initially a high density ( z 10" particle cmp3) and moderately high temperature ( N lo2 eV) pinch is formed which after a few tens of nanoseconds (normally after the onset of the sausage instability) gets highly turbulent and then relaxes (DEUTCHE et al, 1983) into a cylindrical column of density z 10l8 particles cmp3 and a temperature of a few kiloelectronvolts (MATHER, 1971). This pinch also has, along with the current-induced azimuthal magnetic field ( B J , an axial component of magnetic field (B,) having a magnitude of the same order as B, (RAGER, 1981 ;HEROLD et al, 1984). The generating mechanism of this axial magnetic field is still not well understood.…”

Section: Introductionmentioning

confidence: 99%

Observation of helical structure in a low energy plasma focus pinch

Rout

Shyam

1989

Plasma Phys. Control. Fusion

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Helical structure and hot spots were observed in a Mather-type plasma focus operated at 3 KJ of bank energy. The experiments were carried out with the help of a fast optical framing camera and two X-ray pin-hole cameras with different filters. It was observed that initially a conical pinch (with base diameter of 6 mm and length of 14 mm) with temperature of z lo2 eV was formed. This pinch disintegrated after -50 ns by a single lobe sausage instability into a central high temperature ( 2 IO3 eV) filament of

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“…Therefore, the fast-electron preheating must not overcome that produced by the shock wave. As is shown in a careful analysis of the emission properties of ion and electron beams in the plasma focus at Frascati [20,31,32], the presence of such beams is a sensitive function of the filling pressure. In fact, low filling pressure optimizes the beam production, which decreases when the pressure is increased.…”

Section: Other Conditionsmentioning

confidence: 96%

“…Operated at a charging voltage of V o = 20 kV (i.e. 250 kJ stored in the 1250 /uF condenser bank), the apparatus produced stable plasma columns lasting more than 100 ns, with R o "» 0.6 cm [19][20][21][22], n H p « 3 X 10 l8 cm" 3 and 0 H p « 5 to lOkeV [19,20,22]. On a glass spherical shell with r s = 500Mm, the ablative pressure is calculated to be about 0.77 to 2.4 Mbar.…”

Section: A Comparison With Laser Systemsmentioning

confidence: 99%

“…If r p = 500 urn, A = 14(Z = 7), n H p « 10 18 cm" 3 , 0 H = 5 to 20 keV, the previous expression gives t c «* 0.3 to 0.5 ns, while r is of the order of 100 ns or more [10][11][12][19][20][21][22][23][24]. The high values of r allow the setting of a quasi-steady regime in which the corona is adjusted to the surrounding plasma parameters at every instant of time.…”

Section: Steady Flowmentioning

confidence: 99%

See 1 more Smart Citation

On the use of plasma foci as drivers for pellet implosions

Gratton¹,

Piriz²,

Pouzo

1986

Nucl. Fusion

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A simple model for the interaction between a solid microsphere and a surrounding dense and hot plasma shows that plasma columns such as those produced in plasma focus devices may drive the implosion of the microsphere, thus creating situations of interest for inertial confinement research. The method can be used for microspheres structured in such a way that the implosion does not require a critical temporal profile of the pressure pulse applied on the surface, i.e. for microspheres having thin shells. In this case, it is shown that the plasma column of a plasma focus fed by a condenser bank of a few hundred kilojoules is, potentially, a driver comparable to a multibeam kilojoule Nd laser facility. It is concluded that attention should be paid to plasma focus research in the context of inertial confinement.

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The Plasma Focus

Cited by 8 publications

References 4 publications

Experimental study of the structure of the plasma-current sheath on the PF-1000 facility

Experimental study of the structure of the plasma-current sheath on the PF-1000 facility

Observation of helical structure in a low energy plasma focus pinch

On the use of plasma foci as drivers for pellet implosions

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