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15 Mar 2010

Volume 96, Issue 11, Articles (11xxxx)

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Appl. Phys. Lett. 96, 111901 (2010); http://dx.doi.org/10.1063/1.3358107 (3 pages)

B. Rožič, S. Krause, H. Finkelmann, G. Cordoyiannis, and Z. Kutnjak
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Spatial distribution of nonemissive metastables in a two-frequency capacitively coupled plasma in Ar by using a pair of optical emission lines

Tomihito Ohba and Toshiaki Makabe

Appl. Phys. Lett. 96, 111501 (2010); http://dx.doi.org/10.1063/1.3360888 (3 pages) | Cited 5 times

Online Publication Date: 15 March 2010

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When a pair of short- and long-lived excited molecules are coupled with an upper radiative state, it will be possible to derive the number density of the long-lived species from the optical emission spectroscopy of upper-level short-lived species by careful selection of the pair. Two-dimensional density distributions of the long-lived metastable state Ar(1s5) and that of the short-lived excited state Ar(2p2) are observed and compared in the time-averaged form, using a computerized tomography technique of the emissions from a pair of optical transitions in a two-frequency capacitively coupled plasma in pure Ar.
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52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.20.Fs Electron collisions
52.25.-b Plasma properties

Suppression of high-power microwave dielectric multipactor by resonant magnetic field

C. Chang, G. Z. Liu, C. X. Tang, C. H. Chen, H. Shao, and W. H. Huang

Appl. Phys. Lett. 96, 111502 (2010); http://dx.doi.org/10.1063/1.3360853 (3 pages) | Cited 9 times

Online Publication Date: 16 March 2010

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Through dynamic calculation and electromagnetic particle-in-cell simulation, high-power microwave dielectric multipactor is discovered to be suppressed by utilizing external dc magnetic field parallel to the surface, perpendicular to the rf field and satisfying the gyrofrequency close to the rf frequency Ω ∼ ω. It is found that multipactor electrons emitted from the surface can be resonantly accelerated to obtain the impact energy εe higher than the second crossover energy, leading to secondary emission yield lower than one. Besides, the corresponding flight time gets close to the rf period, also the period of the vector Erf×B, resulting in secondary electrons immediately pulled away without multipactoring along the surface. What is more, with the rf field increasing, suppression effect can be further enhanced due to εe rising.
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52.80.Pi High-frequency and RF discharges
52.80.Vp Discharge in vacuum

Efficient laser-produced plasma extreme ultraviolet sources using grooved Sn targets

S. S. Harilal, T. Sizyuk, V. Sizyuk, and A. Hassanein

Appl. Phys. Lett. 96, 111503 (2010); http://dx.doi.org/10.1063/1.3364141 (3 pages) | Cited 13 times

Online Publication Date: 16 March 2010

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An efficient extreme ultraviolet (EUV) generation method has been developed with the use of a CO2 laser-produced plasma from a grooved target. A ∼ 5% conversion efficiency from laser to 13.5 nm photons was obtained with the use of grooves in a tin target or by repeated laser pulse shots at the same target position. Modeling studies proved that the groove target controls the hydrodynamic expansion of the plasma leading to confinement which prevents the plasma escaping from the EUV production zone.
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52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
42.72.Bj Visible and ultraviolet sources
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