Two-dimensional space-charge-limited flows in a crossed-field gap

Koh, W. S.; Ang, L. K.

doi:doi:10.1063/1.2720710

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Hot ion generation from nanostructured surfaces under intense femtosecond laser irradiation

Studies of ion emission from nanostructured metallic surfaces excited by intense (0.5–6.3×1016 W cm−2) 50 fs laser demonstrate that “hotter” electrons need not to give rise hotter ions, contrary to conventional expectation. Such surfaces produce twice as many ions as planar surfaces in the moderate energy regime (16–75 keV), but their yield in the higher energy range (75–2000 keV) is substantially lower. Surface modulations also influence ion beam divergence.

Nd³⁺ ion shift under domain inversion by electron beam writing in LiNbO₃

Ferroelectric domain inversion has been obtained in Nd3+ doped lithium niobate by means of direct electron beam writing. The local effects of the polarization inversion on the optical transitions of Nd3+ ions have been studied by low temperature high resolution site selective spectroscopy. Inverted regions present different axial crystal field acting over Nd3+ ions compared with noninverted (original) regions. The results can be interpreted in terms of slight shifts of Nd3+ ions along the ferro...

This letter presents a two-dimensional (2D) model of space-charge-limited current in a planar crossed-field gap with a magnetic strength of B/B_H = 0–3, where B_H is the Hull cutoff magnetic field. The electrons are emitted from an infinite length strip of finite width W comparable to the gap spacing D. It is found that the 2D enhancement of the crossed-field limiting current is 1+F×4D/(πW), where F ( = 0.05–0.5) is a normalized mean-position factor, and it is a function of B/B_H. Good agreement has been obtained in comparisons with particle-in-cell simulation.

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KEYWORDS and PACS

Keywords

space charge waves, plasma transport processes, plasma magnetohydrodynamics, plasma simulation

PACS

52.59.Sa

Space-charge-dominated beams
52.40.Mj

Particle beam interactions in plasmas
52.25.Fi

Transport properties
52.30.Cv

Magnetohydrodynamics (including electron magnetohydrodynamics)
52.65.Rr

Particle-in-cell method

ARTICLE DATA

Digital Object Identifier

http://dx.doi.org/10.1063/1.2720710

PUBLICATION DATA

ISSN

0003-6951 (print)

1077-3118 (online)

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American Institute of Physics

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