An inverse pinch plasma source for plasma opening switches

Moschella, J.J.; Hazelton, R. C.; Vidoli, C.; Yadlowsky, E. J.

doi:10.1109/27.902253

Cited by 10 publications

(4 citation statements)

References 23 publications

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“…The IP is a gas driven plasma source that is essentially the inverse of a conventional gas puff Z pinch. 25 The source was operated by pulsing a fast-acting gas-valve that was followed, 325-400 µs later, by a capacitive discharge that initiated plasma formation. The H 2 pressure in the gas-valve ranged from 100 to 800 psi (gauge).…”

Section: Experimental Details and Diagnosticsmentioning

confidence: 99%

“…This aspect of the IP source was discussed by Moschella and co-workers and results from the fact that the IP produces a radially expanding, annular plasma ring. 25,42 The entire plasma mass produced by the IP can be injected into the POS in a few microseconds. In the Hawk configuration, the 3.4-3.6 µs delay that was used resulted in an initial plasma distribution that was radially uniform to within ±10% of the average, and remained that way for Ϸ1 s in the absence of a generator discharge.…”

Section: Experimental Details and Diagnosticsmentioning

confidence: 99%

“…Ananjin et al investigated a POS using hydrogen plasma from a coaxial plasma gun, but measurements of the plasma purity, conduction scaling, or density evolution were not reported. 24 For our experiments, the gas-driven inverse pinch (IP) plasma source 25 was used on the Hawk generator at the Naval Research Laboratory with an inductive (shorted) load as shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of the conduction phase of a plasma opening switch using a hydrogen plasma

Moschella¹,

Vidoli²,

Yadlowsky³

et al. 2005

Physics of Plasmas

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Section: Experimental Details and Diagnosticsmentioning

confidence: 99%

Section: Experimental Details and Diagnosticsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Characterization of the conduction phase of a plasma opening switch using a hydrogen plasma

Moschella¹,

Vidoli²,

Yadlowsky³

et al. 2005

Physics of Plasmas

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“…Further investigations are needed to determinate the density effects from those of the plasma composition. The use of the "inverse pinch" plasma source that was recently suggested and implemented in a cylindrical POS configuration in producing single-ion species plasmas with high degree of purity should be well considered [28], [29]. Calculations of the magnetic field velocities using the simple Hall field theory give values that are reasonably close to the measurements, although they appear to consistently fall within the lower limit of the error bars.…”

Section: Discussionmentioning

confidence: 68%

On the Role of the Plasma Composition in the Magnetic Field Evolution in Plasma Opening Switches

Osin

Doron

Arad

et al. 2004

IEEE Trans. Plasma Sci.

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Abstract-High spatial-and temporal-resolution spectroscopic methods are employed to perform detailed studies of the interaction between the propagating magnetic field and a multi-ion-species plasma. The experiment is performed in a plasma-opening-switch configuration, in which a 150-kA current of 400 ns duration is conducted through a plasma. Recent observations demonstrated a new phenomenon of simultaneous rapid magnetic field penetration into the heavy-ion plasma and specular reflection of the light-ion plasma, leading to ion-species separation. Additionally, noticeable inconsistencies between experimental results and theories were found. The current paper summarizes these recent results and discusses the aspect of the role of the plasma composition in the magnetic field evolution and ion dynamics. In order to systematically investigate the effect of the plasma composition, a method for producing plasmas with controllable compositions, based on spatial species separation and electrode heating, is presented. This method allows for achieving plasmas with varying proton-to-carbon ion ratios, however, at different electron densities. Measurements are described for studying the relation between the magnetic field propagation velocity and the plasma composition and density; however, this relation is not yet satisfactorily clear.Index Terms-Magnetic field-plasma interaction, multi-ion species plasma, plasma devices, plasma spectroscopy.

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Plasma dynamics in pulsed strong magnetic fields

et al. 2004

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Recent investigations of the interaction of fast-rising magnetic fields with multi-species plasmas at densities of 1013–1015 cm−3 are described. The configurations studied are planar or coaxial interelectrode gaps pre-filled with plasmas, known as plasma opening switches. The diagnostics are based on time-dependent, spatially resolved spectroscopic observations. Three-dimensional spatial resolution is obtained by plasma-doping techniques. The measurements include the propagating magnetic field structure, ion velocity distributions, electric field strengths, and non-Maxwellian electron energy distribution across the magnetic field front. It is found that the magnetic field propagation velocity is faster than expected from diffusion. The magnetic field evolution cannot be explained by the available theoretical treatments based on the Hall field (that could, in principle, explain the fast field propagation). Moreover, detailed observations reveal that magnetic field penetration and plasma reflection occur simultaneously, leading to ion-species separation, which is also not predicted by the available theories. A possible mechanism that is based on the formation of small-scale density fluctuations, previously formulated for astrophysical plasmas, may explain these results.

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An inverse pinch plasma source for plasma opening switches

Cited by 10 publications

References 23 publications

Characterization of the conduction phase of a plasma opening switch using a hydrogen plasma

Characterization of the conduction phase of a plasma opening switch using a hydrogen plasma

On the Role of the Plasma Composition in the Magnetic Field Evolution in Plasma Opening Switches

Plasma dynamics in pulsed strong magnetic fields

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