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7 Aug 2006

Volume 89, Issue 6, Articles (06xxxx)

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Appl. Phys. Lett. 89, 062501 (2006); http://dx.doi.org/10.1063/1.2259813 (3 pages)

Sangkook Choi, Ki-Suk Lee, and Sang-Koog Kim
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Low-power magnetized microdischarge ion source

Tsuyohito Ito and Mark A. Cappelli

Appl. Phys. Lett. 89, 061501 (2006); http://dx.doi.org/10.1063/1.2335612 (3 pages) | Cited 8 times

Online Publication Date: 8 August 2006

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The authors report on the design and operation of a magnetized microdischarge ion source. The discharge is a coaxial (E×B) configuration with a closed-electron drift. Conditions are selected such that the ions are nonmagnetized and the electrons strongly magnetized. The operating characteristics of this ion source are studied in the 10–40 W power range, generating a total ion current as high as 0.15 A and a peak ion energy of ∼ 150 eV at an operating voltage of 200 V. The ionization efficiency approaches 100%, although the present design has a fairly large ion beam divergence ( ∼ 80° half-angle). The compact nature of this ion source is suitable for localized processing or can be easily clustered for multi-ion processing.
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52.50.Dg Plasma sources
52.80.-s Electric discharges
52.25.Fi Transport properties
52.25.Xz Magnetized plasmas
52.20.Fs Electron collisions
52.20.Hv Atomic, molecular, ion, and heavy-particle collisions

Study of geometrical and operational parameters controlling the low frequency microjet atmospheric pressure plasma characteristics

Dan Bee Kim, J. K. Rhee, S. Y. Moon, and W. Choe

Appl. Phys. Lett. 89, 061502 (2006); http://dx.doi.org/10.1063/1.2335956 (3 pages) | Cited 15 times

Online Publication Date: 10 August 2006

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Controllability of small size atmospheric pressure plasma generated at low frequency in a pin to dielectric plane electrode configuration was studied. It was shown that the plasma characteristics could be controlled by geometrical and operational parameters of the experiment. Under most circumstances, continuous glow discharges were observed, but both the corona and/or the dielectric barrier discharge characteristics were observed depending on the position of the pin electrode. The plasma size and the rotational temperature were also varied by the parameters. The rotational temperature was between 300 and 490 K, being low enough to treat thermally sensitive materials.
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52.50.Dg Plasma sources
52.80.Hc Glow; corona
52.25.-b Plasma properties
52.70.Ds Electric and magnetic measurements
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.77.Fv High-pressure, high-current plasmas (plasma spray, arc welding, etc.)

Depleted uranium (math) induced preionization for enhanced and reproducible x-ray emission from plasma focus

S. Ahmad, M. Shafiq, M. Zakaullah, and A. Waheed

Appl. Phys. Lett. 89, 061503 (2006); http://dx.doi.org/10.1063/1.2244055 (3 pages) | Cited 5 times

Online Publication Date: 10 August 2006

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The effect of preionization induced by depleted uranium (math) around the insulator sleeve on the x-ray emission of (2.3–3.9 kJ) plasma focus device is investigated by employing Quantrad Si p-i-n diodes and a multipinhole camera. X-ray emission in 4π geometry is measured as a function of charging voltage with and without preionization. It is found that the preionization enhances Cu Kα and total x-ray yield about 100%, broadens the x-ray emission pressure range and x-ray pulse width, and improves shot to shot reproducibility of plasma focus operation. The pinhole images of x-ray emitting zones indicate that dominant x-ray emission is from the anode tip.
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52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.25.Jm Ionization of plasmas
52.58.Lq Z-pinches, plasma focus, and other pinch devices
52.75.-d Plasma devices
52.70.La X-ray and γ-ray measurements

Generation of highly collimated high-current ion beams by skin-layer laser-plasma interaction at relativistic laser intensities

J. Badziak, S. Jabłoński, and S. Głowacz

Appl. Phys. Lett. 89, 061504 (2006); http://dx.doi.org/10.1063/1.2266232 (3 pages) | Cited 15 times

Online Publication Date: 11 August 2006

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Generation of fast ion beams by laser-induced skin-layer ponderomotive acceleration has been studied using a two-dimensional (2D) two-fluid relativistic computer code. It is shown that the key parameter determining the spatial structure and angular divergence of the ion beam is the ratio dL/Ln, where dL is the laser beam diameter and Ln is the plasma density gradient scale length. When dL⪢Ln, a dense highly collimated megaampere ion (proton) beam of the ion current density approaching TA/cm2 can be generated by skin-layer ponderomotive acceleration, even with a tabletop subpicosecond laser.
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52.38.Ph X-ray, γ-ray, and particle generation
52.27.Ny Relativistic plasmas
52.35.Mw Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.)
52.38.Kd Laser-plasma acceleration of electrons and ions
52.65.Kj Magnetohydrodynamic and fluid equation
52.25.Fi Transport properties
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