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4 Sep 2006

Volume 89, Issue 10, Articles (10xxxx)

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Appl. Phys. Lett. 89, 103101 (2006); http://dx.doi.org/10.1063/1.2345352 (3 pages)

F. Hao and P. Nordlander
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Influence of the positive ion temperature in cold plasma diagnosis

J. Ballesteros, J. I. Fernández Palop, M. A. Hernández, and R. Morales Crespo

Appl. Phys. Lett. 89, 101501 (2006); http://dx.doi.org/10.1063/1.2345252 (3 pages) | Cited 3 times

Online Publication Date: 5 September 2006

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The influence of the positive ion temperature in cold plasma diagnosis by using Langmuir probes is analyzed. The positive ion zone of the I-V characteristic is used. This zone is distinguished because the charge drained from the plasma is small, diminishing the perturbation due to the measurement process. Nevertheless, it is much affected by the positive ion temperature, thus the traditional methods give inaccurate values for the electron density. Moreover, for an accurate measurement of that current, a good calibration of the instrument used must be ensured. The authors propose the floating potential as the proper parameter to control that calibration.
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52.70.Ds Electric and magnetic measurements
52.25.Fi Transport properties

Compact X-pinch based point x-ray source for phase contrast imaging of inertial confinement fusion capsules

F. N. Beg, R. B. Stephens, H.-W. Xu, D. Haas, S. Eddinger, G. Tynan, E. Shipton, B. DeBono, and K. Wagshal

Appl. Phys. Lett. 89, 101502 (2006); http://dx.doi.org/10.1063/1.2335959 (3 pages) | Cited 13 times

Online Publication Date: 5 September 2006

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Results from experiments performed to characterize plastic capsules containing foam layers are presented. A compact X-pinch pulser with a footprint <1 m2 having a peak current of 80 kA and a rise time of 50 ns was used. Various wire materials including tungsten, molybdenum, and aluminum were employed. Results with plastic capsules (1 mm diameter, 20 μm thick wall with 80 μm foam inside the capsule) show phase contrast effects at the edges of the wall due to the foam, which mimics the ice inside the shell. The sharpness of the image reveals a source less than 2 μm in size and x-ray diodes show a pulse length of ∼ 10 ns. The small source size allows high-resolution phase contrast imaging of capsules. The x-ray pulse from an X-pinch is sufficiently short to avoid the motional blurring due to cryogenic system vibrations, which is not possible with low flux sources.
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52.70.La X-ray and γ-ray measurements
07.85.Fv X- and γ-ray sources, mirrors, gratings, and detectors
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.58.Lq Z-pinches, plasma focus, and other pinch devices
52.59.Qy Wire array Z-pinches
52.40.Hf Plasma-material interactions; boundary layer effects

Explosion dynamics of dusty plasma liquids induced by laser ablation on suspended dust particles

Hong-Yu Chu, Chen-Ting Liao, and Lin I

Appl. Phys. Lett. 89, 101503 (2006); http://dx.doi.org/10.1063/1.2348778 (3 pages) | Cited 3 times

Online Publication Date: 8 September 2006

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Dusty plasma liquids can be formed by suspending negatively charged micrometer sized dust particles in a low pressure glow discharge. We investigate the dynamical behaviors of the expanding plume generated by the ablation on one of the suspended particles using a focused nanosecond pulsed laser, through monitoring the white light emission intensity and dust particle trajectories. In the initial 10 μs, the diameter of the expanding plume scales as D∝P−0.37t0.31, where P is the background pressure. The surrounding dust particles start to be driven away radially after tens of microseconds. The diameter of the expanding cavity (plasma bubble) with dust depletion scales as D∝t0.33.
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52.27.Lw Dusty or complex plasmas; plasma crystals
52.50.Lp Plasma production and heating by shock waves and compression
52.38.Mf Laser ablation
52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.25.Fi Transport properties
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