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26 Jun 2006

Volume 88, Issue 26, Articles (26xxxx)

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Appl. Phys. Lett. 88, 261107 (2006); http://dx.doi.org/10.1063/1.2213912 (3 pages)

Stanley S. Hong, Berthold K. P. Horn, Dennis M. Freeman, and Michael S. Mermelstein
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Effect of wire number on x-pinch discharges

J. S. Green, S. N. Bland, M. Collett, A. E. Dangor, K. Krushelnick, F. N. Beg, and I. Ross

Appl. Phys. Lett. 88, 261501 (2006); http://dx.doi.org/10.1063/1.2216110 (3 pages) | Cited 4 times

Online Publication Date: 26 June 2006

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An investigation has been carried out into the x-ray emission and plasma dynamics of a “tabletop” x-pinch plasma generated by passing a 40 ns, 35 kA current pulse through two or four 5 μm thick tungsten wires. It was found that a four-wire x pinch consistently resulted in an order of magnitude higher energy hard x-ray yield (>3.5 keV) than a two-wire pinch. The total x-ray emission from a four-wire pinch also had a shorter pulse length such that the total x-ray power was increased by more than a factor of 2. Observations of x-pinch discharges driven by a higher energy 160 kA, 80 ns generator are also presented. In this case x pinches with two, four, and six wires were made using thicker aluminum and molybdenum wires and the number of wires is shown to play a significant role in the plasma dynamics. Increasing the number of wires enhanced the reproducibility of the discharge and the x-ray pulse.
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52.58.Lq Z-pinches, plasma focus, and other pinch devices
52.59.Qy Wire array Z-pinches
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.59.Px Hard X-ray sources
52.50.Dg Plasma sources
52.70.Kz Optical (ultraviolet, visible, infrared) measurements

Effect of collisions in the stratified presheath in electronegative plasmas

J. I. Fernández Palop, J. Ballesteros, R. Morales Crespo, and M. A. Hernández

Appl. Phys. Lett. 88, 261502 (2006); http://dx.doi.org/10.1063/1.2218319 (3 pages) | Cited 7 times

Online Publication Date: 28 June 2006

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The effect of collisions in the formation of a stratified presheath in electronegative plasmas is analyzed. Collisions do not affect to the sheath-presheath structure in pure electropositive plasmas; however, in the case of electronegative plasmas, they can produce a large effect, changing the electric potential distribution in the presheath from monotonic to oscillatory, and viceversa. The influence of the collision rate on the plasma parameter space region in which the presheath becomes stratified is analyzed.
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52.40.Kh Plasma sheaths
52.20.Hv Atomic, molecular, ion, and heavy-particle collisions
52.20.Fs Electron collisions
52.35.Fp Electrostatic waves and oscillations (e.g., ion-acoustic waves)
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