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2 Aug 2010

Volume 97, Issue 5, Articles (05xxxx)

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Appl. Phys. Lett. 97, 051101 (2010); http://dx.doi.org/10.1063/1.3470591 (3 pages)

Pascal Böhi, Max F. Riedel, Theodor W. Hänsch, and Philipp Treutlein
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On the hysteresis at ion extraction in the single-grid ion source

D. V. Rafalskyi and S. V. Dudin

Appl. Phys. Lett. 97, 051501 (2010); http://dx.doi.org/10.1063/1.3475924 (3 pages) | Cited 3 times

Online Publication Date: 3 August 2010

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The ion extraction in the single-grid ion source with a woven extraction grid is researched. It has been found experimentally that the extraction can occur in “low current” and “high current” modes with stepwise hysteretic transitions between them. The assumption has been made that the existence of the two extraction regimes can be explained by the existence of two kinds of the space charge sheaths near the grid wires. This assumption is confirmed by the estimations of the sheath depth for the cylindrical and plane geometries.
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52.50.Dg Plasma sources
52.40.Kh Plasma sheaths
52.40.Hf Plasma-material interactions; boundary layer effects
52.30.-q Plasma dynamics and flow
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.80.-s Electric discharges

Propagation of energetic electrons in a hollow plasma fiber

C. T. Zhou, L. Y. Chew, and X. T. He

Appl. Phys. Lett. 97, 051502 (2010); http://dx.doi.org/10.1063/1.3475414 (3 pages) | Cited 5 times

Online Publication Date: 4 August 2010

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Transport of energetic electrons in a hollow plasma fiber is investigated. The high-current electron beam induces in the fiber strong radial electric fields and azimuthal magnetic fields on the inner and outer surfaces of the hollow fiber. The hot electrons are pushed out by the surface magnetic field and returned into the fiber by the sheath electric field. Imbalance of the latter fields can drive chaotic oscillations of electrons around the fiber wall. Intense thin return-current layers inside both the inner and outer wall surfaces are observed. This enhances local joule heating around both surfaces by the return current.
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52.40.Mj Particle beam interactions in plasmas
52.30.Cv Magnetohydrodynamics (including electron magnetohydrodynamics)
52.50.-b Plasma production and heating
52.25.Fi Transport properties

Comatic aberration-induced wavy vortex in gas

Hong-Yu Chu, Shang-Bin Lin, and Chang-Rong Ko

Appl. Phys. Lett. 97, 051503 (2010); http://dx.doi.org/10.1063/1.3477950 (3 pages)

Online Publication Date: 5 August 2010

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We investigate the evolution of laser-induced wavy vortex at 460 torr nitrogen gas environment. We show that Rayleigh–Taylor instability and Kelvin–Helmholtz instability are not the causes of the growth of the wavy vortex. Normal diffusion inducing the growth of the ripple-type perturbation is identified. The ratio of the perturbation amplitude to the wavelength of perturbation is found with 0.16. Through a quick estimation, measurements show the consistent scaling relations. We further show that the comatic aberration is suspected to be responsible for the asymmetric rarefaction wave, which triggers Kelvin–Helmholtz instability and induces the wavy vortex.
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47.20.Ma Interfacial instabilities (e.g., Rayleigh-Taylor)
47.32.-y Vortex dynamics; rotating fluids
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