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1 May 2012

Volume 111, Issue 9, Articles (09xxxx)

Issue Cover Spotlight Figure

J. Appl. Phys. 111, 093103 (2012); http://dx.doi.org/10.1063/1.4709385 (8 pages)

Ani Khachatrian, Joseph S. Melinger, and Syed B. Qadri
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back to top Plasmas and Electrical Discharges

Effect of adding small amount of inductive fields to O2, Ar/O2 capacitively coupled plasmas

Min-Hyong Lee, Hyo-Chang Lee, and Chin-Wook Chung

J. Appl. Phys. 111, 093301 (2012); http://dx.doi.org/10.1063/1.4705362 (4 pages)

Online Publication Date: 1 May 2012

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Electron energy distribution functions (EEDFs) of low pressure O2 plasma were measured by adding small amount of coil power in a capacitive discharge. When the plasma was generated by bias power only, the measured EEDF showed a bi-Maxwellian distribution. However, when a very small coil power (a few Watts) was added, the EEDF evolved abruptly into a Maxwellian distribution, while the electron density was decreased. In an Ar/O2 mixture discharge, this EEDF evolution to the Maxwellian was also observed at a relatively higher coil power. This abrupt change in EEDFs with a very small coil power appears to be attributed to a combined effect of collisionless heating by capacitive and induced electric fields.
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52.25.Fi Transport properties
52.50.Qt Plasma heating by radio-frequency fields; ICR, ICP, helicons
52.70.Ds Electric and magnetic measurements
52.80.Pi High-frequency and RF discharges

Characteristics of argon plasma waveguide produced by alumina capillary discharge for short wavelength laser application

Takeshi Higashiguchi, Nadezhda Bobrova, Pavel Sasorov, Shohei Sakai, Yasuhiko Sentoku, Ryosuke Kodama, and Noboru Yugami

J. Appl. Phys. 111, 093302 (2012); http://dx.doi.org/10.1063/1.4712038 (7 pages)

Online Publication Date: 7 May 2012

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We have reported the argon (Ar) plasma waveguide produced in an alumina (Al2O3) capillary discharge and used to guide ultrashort laser pulses at intensities of the order of 1016 W/cm2. The electron density in the plasma waveguide was measured to be 1×1018 cm−3, in agreement with one-dimensional magnetrohydrodynamic (MHD) simulations. The MHD code was also used to evaluate the degree of ionization of argon (Ar) in the preformed plasma waveguide. The maximum ion charge state of Ar3+ in capillary discharge was measured and obtained in the MHD simulations. The spectrum of the propagated laser pulse in the Ar plasma waveguide was not modified and was well reproduced by a particle-in-cell simulations under initial ion charge state of Ar3+ in the preformed plasma waveguide. The optimum timing for the laser pulse injection was around 150 ns after initiation of a discharge with a peak current of 200 A.
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52.38.Dx Laser light absorption in plasmas (collisional, parametric, etc.)
52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
52.65.Kj Magnetohydrodynamic and fluid equation
42.65.Re Ultrafast processes; optical pulse generation and pulse compression
42.79.Gn Optical waveguides and couplers
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.30.Cv Magnetohydrodynamics (including electron magnetohydrodynamics)

Ion velocity and plasma potential measurements of a cylindrical cusped field thruster

N. A. MacDonald, C. V. Young, M. A. Cappelli, and W. A. Hargus, Jr.

J. Appl. Phys. 111, 093303 (2012); http://dx.doi.org/10.1063/1.4707953 (7 pages) | Cited 1 time

Online Publication Date: 7 May 2012

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Measurements of the most probable time-averaged axial ion velocities and plasma potential within the acceleration channel and in the plume of a straight-channeled cylindrical cusped field thruster operating on xenon are presented. Ion velocities for the thruster are derived from laser-induced fluorescence measurements of the 5d[4]7/2-6p[3]5/2 xenon ion excited state transition centered at λ = 834.72nm. Plasma potential measurements are made using a floating emissive probe with a thoriated-tungsten filament. The thruster is operated in a power matched condition with 300 V applied anode potential for comparison to previous krypton plasma potential measurements, and a low power condition with 150 V applied anode potential. Correlations are seen between the plasma potential drop outside of the thruster and kinetic energy contours of the accelerating ions.
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52.75.Di Ion and plasma propulsion
52.70.Ds Electric and magnetic measurements

Removal of amorphous C and Sn on Mo:Si multilayer mirror surface in Hydrogen plasma and afterglow

O. V. Braginsky, A. S. Kovalev, D. V. Lopaev, E. M. Malykhin, T. V. Rakhimova, A. T. Rakhimov, A. N. Vasilieva, S. M. Zyryanov, K. N. Koshelev, V. M. Krivtsun, Maarten van Kaampen, and D. Glushkov

J. Appl. Phys. 111, 093304 (2012); http://dx.doi.org/10.1063/1.4709408 (4 pages) | Cited 2 times

Online Publication Date: 9 May 2012

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Removal of amorphous carbon and tin films from a Mo:Si multilayer mirror surface in a hydrogen plasma and its afterglow is investigated. In the afterglow, the mechanism of Sn and C films removal is solely driven by hydrogen atoms (radicals). Probabilities of Sn and C atoms removal by H atoms were measured. It was shown that the radical mechanism is also dominant for Sn atoms removal in the hydrogen plasma because of the low ion energy and flux. Unlike for Sn, the removal mechanism for C atoms in the plasma is ion-stimulated and provides a much higher removal rate.
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81.65.Cf Surface cleaning, etching, patterning
52.80.Hc Glow; corona
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