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4 Feb 2008

Volume 92, Issue 5, Articles (05xxxx)

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Appl. Phys. Lett. 92, 053301 (2008); http://dx.doi.org/10.1063/1.2838457 (3 pages)

Michael S. Arnold, Gregory J. McGraw, Stephen R. Forrest, and Richard R. Lunt
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Electron density and temperature measurement of an atmospheric pressure plasma by millimeter wave interferometer

Xin Pei Lu and Mounir Laroussi

Appl. Phys. Lett. 92, 051501 (2008); http://dx.doi.org/10.1063/1.2840194 (2 pages) | Cited 11 times

Online Publication Date: 4 February 2008

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In this paper, a 105 GHz millimeter wave interferometer system is used to measure the electron density and temperature of an atmospheric pressure helium plasma driven by submicrosecond pulses. The peak electron density and electron-neutral collision frequency reach 8×1012 cm−3 and 2.1×1012 s−1, respectively. According to the electron-helium collision cross section and the measured electron-neutral collision frequency, the electron temperature of the plasma is estimated to reach a peak value of about 8.7 eV.
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52.80.-s Electric discharges
52.77.-j Plasma applications

High contrast radiography using a small dense plasma focus

F. Castillo, I. Gamboa-deBuen, J. J. E. Herrera, J. Rangel, and S. Villalobos

Appl. Phys. Lett. 92, 051502 (2008); http://dx.doi.org/10.1063/1.2840191 (2 pages) | Cited 6 times

Online Publication Date: 4 February 2008

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Radiographs are obtained with a small (4.6 kJ) dense plasma focus machine, using the x-rays which cross a 300 μm aluminum window on the axis. Contrast is improved by inserting an iron needle on the tip of the electrode. Measurements with TLD-100 dosimeters have shown the average dose to increase from 0.077±0.006 mGy/shot, when a hollow cathode is used, to 0.11±0.01 mGy/shot, with the needle. The spectrum is estimated using aluminum filters and the effective equivalent energy is found to be in the range of 20–25 keV.
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52.59.Hq Dense plasma focus

Formation and role of cool flames in plasma-assisted premixed combustion

W. Kim, M. G. Mungal, and M. A. Cappelli

Appl. Phys. Lett. 92, 051503 (2008); http://dx.doi.org/10.1063/1.2841894 (3 pages) | Cited 7 times

Online Publication Date: 8 February 2008

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The structure of a plasma-assisted laminar premixed flame is studied numerically. The initial radical yield generated by a nonequilibrium discharge serves as the boundary condition for a one-dimensional flame code predicting the formation of a cool flame which pilots the premixed methane/air combustion. The ignition of the surrounding unactivated methane-air mixture by this cool flame is modeled as an opposed diffusion flame. Our findings indicate that the nonequilibrium discharge is an in situ reformer of the fuel for the production of the cool flame, producing primarily H2 and CO, thus, facilitating the burning of the lean methane-air mixture.
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82.33.Vx Reactions in flames, combustion, and explosions

Uniformity of internal linear-type inductively coupled plasma source for flat panel display processing

Jong Hyeuk Lim, Kyong Nam Kim, Jung Kyun Park, Jong Tae Lim, and Geun Young Yeom

Appl. Phys. Lett. 92, 051504 (2008); http://dx.doi.org/10.1063/1.2840997 (3 pages) | Cited 4 times

Online Publication Date: 8 February 2008

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The variation in plasma uniformity over an extremely large size inductively coupled plasma (ICP) source of 2750×2350 mm2 was examined. An internal linear-type antenna called “double comb-type antenna” was used as the ICP source. A plasma density of ∼ 1.4×1011/cm3 could be obtained at 5 mTorr Ar by applying 10 kW rf power to the source at a frequency of 13.56 MHz. An increase in rf power from 1 to 10 kW improved the plasma uniformity over a substrate area of 2300×2000 mm2 from 18.1% to 11.4%. The improvement in uniformity of the internal ICP source was attributed to the increase in plasma density near the wall.
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42.79.Kr Display devices, liquid-crystal devices
52.50.Dg Plasma sources
84.40.Ba Antennas: theory, components and accessories
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