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14 Feb 2011

Volume 98, Issue 7, Articles (07xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 98, 073101 (2011); http://dx.doi.org/10.1063/1.3554360 (3 pages)

Wei Xu, Rajesh Leeladhar, Yao-Tsan Tsai, Eui-Hyeok Yang, and Chang-Hwan Choi
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Experimental evidence of thermonuclear neutrons in a modified plasma focus

D. Klir, P. Kubes, M. Paduch, T. Pisarczyk, T. Chodukowski, M. Scholz, Z. Kalinowska, E. Zielinska, B. Bienkowska, J. Hitschfel, S. Jednorog, L. Karpinski, J. Kortanek, J. Kravarik, K. Rezac, et al.

Appl. Phys. Lett. 98, 071501 (2011); http://dx.doi.org/10.1063/1.3555447 (3 pages) | Cited 5 times

Online Publication Date: 14 February 2011

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The PF-1000 plasma focus was modified by adding the cathode disk 3 cm in front of the anode. This modification facilitated the evaluation of neutron energy spectra. Two neutron pulses were distinguishable. As regards the first neutron pulse, it lasted 40 ns during the plasma stagnation and it demonstrated high isotropy of neutron emission. A peak neutron energy detected upstream was 2.46±0.02 MeV. The full width of neutron energy spectra of 90±20 keV enabled to calculate an ion temperature of 1.2 keV. These parameters and a neutron yield of 109 corresponded to theoretical predictions for thermonuclear neutrons.
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52.58.Lq Z-pinches, plasma focus, and other pinch devices
52.75.-d Plasma devices
52.25.Tx Emission, absorption, and scattering of particles
52.70.Nc Particle measurements

Role of charge photodesorption in self-synchronized breakdown of surface streamers in air at atmospheric pressure

O. Guaitella, I. Marinov, and A. Rousseau

Appl. Phys. Lett. 98, 071502 (2011); http://dx.doi.org/10.1063/1.3552965 (3 pages) | Cited 1 time

Online Publication Date: 16 February 2011

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A surface dielectric barrier discharge configuration with two identical high voltage electrodes is investigated in air at atmospheric pressure. Synchronized breakdown of streamers on both electrodes is evidenced by statistical study. The light emitted by plasma filament on one electrode can trigger the breakdown of streamers on the other electrode. The role of photodesorption of negative charges deposited on the Pyrex dielectric barrier is responsible for these self-synchronized breakdowns. The binding energy of negative charges photodesorbed is estimated to be lower than 3.5 eV.
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52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.80.-s Electric discharges
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