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28 Aug 2006

Volume 89, Issue 9, Articles (09xxxx)

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Appl. Phys. Lett. 89, 093101 (2006); http://dx.doi.org/10.1063/1.2338808 (3 pages)

Nicholas Jabari Lee, Rajiv K. Kalia, Aiichiro Nakano, and Priya Vashishta
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Charge neutralization of dust particles in a plasma with negative ions

Robert L. Merlino and Su-Hyun Kim

Appl. Phys. Lett. 89, 091501 (2006); http://dx.doi.org/10.1063/1.2338790 (3 pages) | Cited 33 times

Online Publication Date: 28 August 2006

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Charging of dust grains in a plasma with negative ions is studied experimentally. When the relatively mobile electrons are attached to heavy negative ions, their tendency to charge the grains negatively is reduced. In a plasma in which a substantial fraction of the electrons are eliminated (positive ion/negative ion plasma), the grain charge can be reduced in magnitude nearly to zero (“decharging” or charge neutralization). If the positive ions are lighter than the negative ions, dust grains having a small net positive charge can be produced.
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52.27.Lw Dusty or complex plasmas; plasma crystals
52.20.Fs Electron collisions
52.20.Hv Atomic, molecular, ion, and heavy-particle collisions
52.25.Fi Transport properties

Plasma-focus-based tabletop hard x-ray source for 50 ns resolution introspective imaging of metallic objects through metallic walls

C. Moreno, V. Raspa, L. Sigaut, R. Vieytes, and A. Clausse

Appl. Phys. Lett. 89, 091502 (2006); http://dx.doi.org/10.1063/1.2335631 (3 pages) | Cited 4 times

Online Publication Date: 28 August 2006

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A tabletop 4.7 kJ, 30 kV plasma focus device was used as a pulsed hard x-ray source for fast radiography (50 ns exposure time) of metallic pieces even through several millimeter thick metallic walls. An experimental estimation of the effective average energy of the x-ray beam (found to be around 100 keV) and a numerical estimation of the induced voltage on the focus during the compressional stage of a plasma focus are briefly discussed.
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52.59.Px Hard X-ray sources
52.58.Lq Z-pinches, plasma focus, and other pinch devices
52.75.-d Plasma devices
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.70.La X-ray and γ-ray measurements
07.85.Fv X- and γ-ray sources, mirrors, gratings, and detectors

Mechanism of laser plasma production and of plasma interaction with a target

I. I. Beilis

Appl. Phys. Lett. 89, 091503 (2006); http://dx.doi.org/10.1063/1.2345044 (3 pages) | Cited 8 times

Online Publication Date: 29 August 2006

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A model of plasma production by laser interaction with a solid target was developed taking into account plasma heating by the emitted electrons, as additional to the absorbed laser energy flux, and also target heating by ion bombardment, as additional heat source to the laser radiation. A system of equations, including equations for solid heat conduction, plasma generation, and the plasma expansion, was solved self-consistently. The proposed model allows to understand that the plasma, partially shielding the laser radiation from the target, also converts absorbed laser energies to kinetic and potential energy of the plasma particles, which transport this energy not only in the ambient vacuum but also through the electrostatic sheath to the solid surface.
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52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
52.50.Gj Plasma heating by particle beams
52.38.Dx Laser light absorption in plasmas (collisional, parametric, etc.)
52.25.Fi Transport properties
52.40.Kh Plasma sheaths
52.40.Hf Plasma-material interactions; boundary layer effects

Theory and simulations of a gyrotron backward wave oscillator using a helical interaction waveguide

W. He, A. W. Cross, A. D. R. Phelps, K. Ronald, C. G. Whyte, S. V. Samsonov, V. L. Bratman, and G. G. Denisov

Appl. Phys. Lett. 89, 091504 (2006); http://dx.doi.org/10.1063/1.2345607 (3 pages) | Cited 16 times

Online Publication Date: 1 September 2006

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A gyrotron backward wave oscillator (gyro-BWO) with a helically corrugated interaction waveguide demonstrated its potential as a powerful microwave source with high efficiency and a wide frequency tuning range. This letter presents the theory describing the dispersion properties of such a waveguide and the linear beam-wave interaction. Numerical simulation results using the PIC code MAGIC were found to be in excellent agreement with the output measured from a gyro-BWO experiment.
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84.40.Ik Masers; gyrotrons (cyclotron-resonance masers)
84.40.Fe Microwave tubes (e.g., klystrons, magnetrons, traveling-wave, backward-wave tubes, etc.)
84.40.Az Waveguides, transmission lines, striplines
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