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9 May 2005

Volume 86, Issue 19, Articles (19xxxx)

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Appl. Phys. Lett. 86, 191102 (2005); http://dx.doi.org/10.1063/1.1922084 (3 pages)

Nir Dahan, Avi Niv, Gabriel Biener, Vladimir Kleiner, and Erez Hasman
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Ti Kα radiography of Cu-doped plastic microshell implosions via spherically bent crystal imaging

J. A. King, K. Akli, B. Zhang, R. R. Freeman, M. H. Key, C. D. Chen, S. P. Hatchett, J. A. Koch, A. J. MacKinnon, P. K. Patel, R. Snavely, R. P. J. Town, M. Borghesi, L. Romagnani, M. Zepf, et al.

Appl. Phys. Lett. 86, 191501 (2005); http://dx.doi.org/10.1063/1.1923178 (3 pages) | Cited 9 times

Online Publication Date: 3 May 2005

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We show that short pulse laser generated Ti Kα radiation can be used effectively as a backlighter for radiographic imaging. This method of x-ray radiography features high temporal and spatial resolution, high signal to noise ratio, and monochromatic imaging. We present here the Ti Kα backlit images of six-beam driven spherical implosions of thin-walled 500-μm Cu-doped deuterated plastic (CD) shells and of similar implosions with an included hollow gold cone. These radiographic results were used to define conditions for the diagnosis of fast ignition relevant electron transport within imploded Cu-doped coned CD shells.
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81.70.Ex Nondestructive testing: electromagnetic testing, eddy-current testing
78.47.-p Spectroscopy of solid state dynamics
07.85.-m X- and γ-ray instruments

Suppression of ionization instability in a magnetohydrodynamic plasma by coupling with a radio-frequency electromagnetic field

Tomoyuki Murakami, Yoshihiro Okuno, and Hiroyuki Yamasaki

Appl. Phys. Lett. 86, 191502 (2005); http://dx.doi.org/10.1063/1.1926410 (3 pages) | Cited 8 times

Online Publication Date: 4 May 2005

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We describe the suppression of ionization instability and the control of a magnetohydrodynamic electrical power-generating plasma by coupling with a radio-frequency (rf) electromagnetic field. The rf heating stabilizes the unstable plasma behavior and homogenizes the nonuniform plasma structure, whereby the power-generating performance is significantly improved.
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52.35.Py Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.)
52.75.Fk Magnetohydrodynamic generators and thermionic convertors; plasma diodes
52.50.Qt Plasma heating by radio-frequency fields; ICR, ICP, helicons
52.30.Cv Magnetohydrodynamics (including electron magnetohydrodynamics)
52.80.-s Electric discharges

Possible method for diagnosing waves in dusty plasmas with magnetized charged dust particulates

M. Rosenberg and P. K. Shukla

Appl. Phys. Lett. 86, 191503 (2005); http://dx.doi.org/10.1063/1.1923749 (3 pages) | Cited 3 times

Online Publication Date: 4 May 2005

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We discuss theoretically a possible method for diagnosing some features of dust wave behavior in a magnetized plasma containing small (tens of nm) charged dust grains whose motion is magnetized. It is easier to magnetize a small dust particle because its charge-to-mass ratio increases as its size decreases. However, it is more difficult to use the backscattering of light from the dust as a diagnostic as the dust size decreases below the diffraction limit. The idea proposed here is to measure the reduction in transmitted UV or optical light intensity due to enhanced extinction by small metal dust particles that have surface plasmon resonances at those wavelengths. Such measurements could indicate the spatial location of the dust density compressions or rarefactions, which may yield information on the dust wave behavior, or perhaps even charged dust transport. Parameters that may be relevant to possible laboratory dusty plasma experiments are discussed.
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52.27.Lw Dusty or complex plasmas; plasma crystals
52.25.Xz Magnetized plasmas
52.25.Fi Transport properties
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.35.-g Waves, oscillations, and instabilities in plasmas and intense beams

2.45 GHz microwave-excited atmospheric pressure air microplasmas based on microstrip technology

Jaeho Kim and Kazuo Terashima

Appl. Phys. Lett. 86, 191504 (2005); http://dx.doi.org/10.1063/1.1926411 (3 pages) | Cited 24 times

Online Publication Date: 5 May 2005

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A plasma system based on microstrip technology was developed for the generation of atmospheric pressure microplasmas. A discharge gap was placed between the striplines and the ground plane on the transverse cross section in the direction of microwave propagation. This microstrip structure permits the concentration of electric fields at the discharge gap, which is confirmed by a computer simulation using the three-dimensional simulation code based on the finite-difference time-domain method, and can produce atmospheric pressure plasmas even in air. The microplasmas were sustained in the discharge gap (width: 0.2 mm, length: 6 mm) at a microwave power of 1 W. The experimentally measured rotational temperature of nitrogen molecules was 800 K, indicating these plasmas to be nonthermal plasmas. This plasma system will provide a portable microplasma system utilizing a small semiconductor microwave source and a large-scale atmospheric pressure nonthermal plasma using the array configuration.
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52.50.Dg Plasma sources
52.40.Db Electromagnetic (nonlaser) radiation interactions with plasma
52.40.Fd Plasma interactions with antennas; plasma-filled waveguides
52.80.-s Electric discharges
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.65.-y Plasma simulation
02.70.Bf Finite-difference methods

Rapid heating of solid density material by a petawatt laser

R. G. Evans, E. L. Clark, R. T. Eagleton, A. M. Dunne, R. D. Edwards, W. J. Garbett, T. J. Goldsack, S. James, C. C. Smith, B. R. Thomas, R. Clarke, D. J. Neely, and S. J. Rose

Appl. Phys. Lett. 86, 191505 (2005); http://dx.doi.org/10.1063/1.1920422 (3 pages) | Cited 27 times

Online Publication Date: 5 May 2005

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Time-resolved x-ray spectra from solid targets irradiated by the VULCAN Petawatt laser focused to 1020 W cm−2 show that material at solid density is heated to temperatures above 500 eV to a depth of about 15 μm and for a duration of more than 30 ps. Modeling with the implicit hybrid plasma code LSP shows that the heating is sensitive to the laser prepulse through resistive inhibition of the laser accelerated electrons in the blow off layer.
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52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
52.70.La X-ray and γ-ray measurements
52.65.Ww Hybrid methods
52.38.Kd Laser-plasma acceleration of electrons and ions
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