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17 Oct 2011

Volume 99, Issue 16, Articles (16xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 99, 163301 (2011); http://dx.doi.org/10.1063/1.3651509 (3 pages)

Jonathan E. Allen, Kevin G. Yager, Htay Hlaing, Chang-Yong Nam, Benjamin M. Ocko, and Charles T. Black
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Efficient laser-proton acceleration from an insulating foil with an attached small metal disk

Kazuto Otani, Shigeki Tokita, Toshihiko Nishoji, Shunsuke Inoue, Masaki Hashida, and Shuji Sakabe

Appl. Phys. Lett. 99, 161501 (2011); http://dx.doi.org/10.1063/1.3652705 (3 pages) | Cited 1 time

Online Publication Date: 17 October 2011

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Efficient proton acceleration by the interaction of an intense femtosecond laser pulse with a solid foil has been demonstrated. An aluminum coating (thickness: 0.2 μm) on a polyethylene (PE) foil was irradiated at 2 × 1018 W/cm2 intensity. The protons from the aluminum-disk (diameter: 150 μm to 15 mm) foil were accelerated to much higher energy in comparison with conventional targets such as PE and aluminum-coated PE foils. The fast electron signal along the foil surface was significantly higher from the aluminum-coated PE foil. The laser-proton acceleration appeared to be affected to the size of surrounding conductive material.
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52.38.Kd Laser-plasma acceleration of electrons and ions
29.20.Ej Linear accelerators

Spectroscopic measurement of electric field in atmospheric-pressure plasma jet operating in bullet mode

Goran B. Sretenović, Ivan B. Krstić, Vesna V. Kovačević, Bratislav M. Obradović, and Milorad M. Kuraica

Appl. Phys. Lett. 99, 161502 (2011); http://dx.doi.org/10.1063/1.3653474 (3 pages) | Cited 5 times

Online Publication Date: 18 October 2011

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Atmospheric-pressure helium plasma jet operating in the bullet/streamer mode has been studied using optical emission spectroscopy. Electric field strength distribution is measured using Stark polarization spectroscopy of He I 492.19 nm line. It is shown that the electric field is almost constant along the jet axis. Measured electric field distribution is in agreement with theoretical predictions of streamer propagation in helium jets at atmospheric pressure. Obtained radial distribution of the axial electric field shows that the ring-shaped structure of the light emission is a consequence of such electric field distribution.
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52.75.-d Plasma devices
52.80.-s Electric discharges
52.25.Ya Neutrals in plasmas
52.70.Kz Optical (ultraviolet, visible, infrared) measurements

Solitary filamentary structures and nanosecond dynamics in atmospheric-pressure plasmas driven by tailored dc pulses

S. Wu, X. P. Lu, K. Ostrikov, D. Liu, and Y. Pan

Appl. Phys. Lett. 99, 161503 (2011); http://dx.doi.org/10.1063/1.3655201 (3 pages) | Cited 2 times

Online Publication Date: 19 October 2011

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Nanosecond dynamics of two separated discharge cycles in an asymmetric dielectric barrier discharge is studied using time-resolved current and voltage measurements synchronized with high-speed (∼5 ns) optical imaging. Nanosecond dc pulses with tailored raise and fall times are used to generate solitary filamentary structures (SFSs) during the first cycle and a uniform glow during the second. The SFSs feature ∼1.5 mm thickness, ∼1.9 A peak current, and a lifetime of several hundred nanoseconds, at least an order of magnitude larger than in common microdischarges. This can be used in alternating localized and uniform high-current plasma treatments in various applications.
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52.35.Py Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.)
52.35.Sb Solitons; BGK modes
52.70.Ds Electric and magnetic measurements
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.80.Hc Glow; corona

Simulation of helium discharge ignition and dynamics in thin tubes at atmospheric pressure

Jaroslav Jánský and Anne Bourdon

Appl. Phys. Lett. 99, 161504 (2011); http://dx.doi.org/10.1063/1.3655199 (3 pages) | Cited 7 times

Online Publication Date: 21 October 2011

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Simulations of the influence of electrode geometries on helium discharge ignition and dynamics in thin dielectric tubes are presented. In all studied cases, as observed in experiments, the discharge ignition occurs at the outer edges of the high voltage ring and the influence of the width of the grounded ring on the discharge dynamics is shown. Taking into account the change of permittivity encountered by the discharge as it exits from the tube, the velocity of the discharge front is shown to increase at the tube exit before decreasing downstream similarly to experimental observations.
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52.80.-s Electric discharges
52.25.Mq Dielectric properties
52.65.-y Plasma simulation
52.75.-d Plasma devices

Directional elliptically polarized terahertz emission from air plasma produced by circularly polarized intense femtosecond laser pulses

Fazel Jahangiri, Masaki Hashida, Shigeki Tokita, Takeshi Nagashima, Masanori Hangyo, and Shuji Sakabe

Appl. Phys. Lett. 99, 161505 (2011); http://dx.doi.org/10.1063/1.3651764 (3 pages) | Cited 2 times

Online Publication Date: 21 October 2011

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We have observed directional elliptically polarized terahertz (THz) waves emitted from air plasma produced by circularly polarized femtosecond laser pulses. The spatial distribution of the THz waves shows that the radiation is strongly directed forward with a peak around the laser propagation direction. Measured THz power shows a square dependence on laser energy. We consider the parametric decay of laser light to R-waves in plasma in the presence of a spontaneous magnetic field as a possible explanation for the polarization, power dependence, and direction of the THz beam.
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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.)
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.38.Fz Laser-induced magnetic fields in plasmas
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