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8 Sep 2008

Volume 93, Issue 10, Articles (10xxxx)

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Appl. Phys. Lett. 93, 101905 (2008); http://dx.doi.org/10.1063/1.2977760 (3 pages)

Mei Wang, Yinwei Li, Tian Cui, Yanming Ma, and Guangtian Zou
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Order of magnitude enhancement in neutron emission with deuterium-krypton admixture operation in miniature plasma focus device

Rishi Verma, P. Lee, S. Lee, S. V. Springham, T. L. Tan, R. S. Rawat, and M. Krishnan

Appl. Phys. Lett. 93, 101501 (2008); http://dx.doi.org/10.1063/1.2979683 (3 pages) | Cited 10 times

Online Publication Date: 8 September 2008

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The effect of varied concentrations of deuterium-krypton (D2–Kr) admixture on the neutron emission of a fast miniature plasma focus device was investigated. It was found that a judicious concentration of Kr in D2 can significantly enhance the neutron yield. The maximum average neutron yield of (1±0.27)×104 n/shot for pure D2 filling at 3 mbars was enhanced to (3.14±0.4)×105 n/shot with D2+2% Kr admixture operation, which represents a >30-fold increase. More than an order of magnitude enhancement in the average neutron yield was observed over the broader operating range of 1–4 mbars for D2+2% Kr and D2+5% Kr admixtures.
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52.58.Lq Z-pinches, plasma focus, and other pinch devices
52.59.Hq Dense plasma focus
29.25.Dz Neutron sources

Reversed scheme of thin foil acceleration

S. Borodziuk, A. Kasperczuk, T. Pisarczyk, J. Ullschmied, E. Krousky, K. Masek, M. Pfeifer, K. Rohlena, J. Skala, and P. Pisarczyk

Appl. Phys. Lett. 93, 101502 (2008); http://dx.doi.org/10.1063/1.2979700 (3 pages) | Cited 3 times

Online Publication Date: 8 September 2008

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An alternative concept for accelerating thin foils to high velocity has been proposed and tested. The thin (10 μm) Al foil has been accelerated by the ablative plasma generated by means of the third harmonic (λ = 0.438 μm, τ = 250 ps) of the iodine laser pulse of the energies of 75 and 190 J irradiating a massive Cu target. Two separation distances of the foil from the massive target of 100 and 500 μm were used. It has been shown that this method of an indirect, two-step acceleration, named as the reversed acceleration scheme, can be more effective than the classic, direct-drive approach. The Al flyer foil has reached a velocity of ∼ 1.3×107 cm/s, i.e., significantly higher than that in the comparable “classic” ablative acceleration experiment.
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52.38.Kd Laser-plasma acceleration of electrons and ions
52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
79.20.Ds Laser-beam impact phenomena

Gas-temperature-dependent generation of cryoplasma jet under atmospheric pressure

Yuri Noma, Jai Hyuk Choi, Takaaki Tomai, and Kazuo Terashima

Appl. Phys. Lett. 93, 101503 (2008); http://dx.doi.org/10.1063/1.2980436 (3 pages) | Cited 9 times

Online Publication Date: 12 September 2008

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Plasma with a gas temperature below room temperature is not yet fully understood although it is expected to be an attractive tool for applications to material processing. In the present work, gas-temperature-dependent generation of a cryoplasma jet was studied. So far, we have generated a helium cryoplasma jet (296–5 K) under atmospheric pressure. At gas temperatures below 20 K, the helium excimer, He2, was observed clearly from by optical emission spectroscopy.
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52.50.-b Plasma production and heating
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
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