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25 Aug 2008

Volume 93, Issue 8, Articles (08xxxx)

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Appl. Phys. Lett. 93, 083901 (2008); http://dx.doi.org/10.1063/1.2973167 (3 pages)

R. J. Martín-Palma, C. G. Pantano, and A. Lakhtakia
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Spectrum modulation of relativistic electrons by laser wakefield

N. Nakanii, K. Kondo, Y. Kuramitsu, Y. Mori, E. Miura, K. Tsuji, K. Kimura, S. Fukumochi, M. Kashihara, T. Tanimoto, H. Nakamura, T. Ishikura, K. Takeda, M. Tampo, H. Takabe, et al.

Appl. Phys. Lett. 93, 081501 (2008); http://dx.doi.org/10.1063/1.2971235 (3 pages) | Cited 2 times

Online Publication Date: 25 August 2008

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Energetic electrons were generated by the interaction of a high-intensity laser pulse with a plasma preformed from a hollow plastic cylinder via laser-driven implosion. The spectra of a comparatively high-density plasma ∼ 1019 cm−3 had a bump around 10 MeV. Simple numerical calculations explained the spectra obtained in this experiment. This indicates that the plasma tube has sufficient potential to convert a Maxwellian spectrum to a comparatively narrow spectrum.
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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
52.38.Dx Laser light absorption in plasmas (collisional, parametric, etc.)

The role of the relative voltage and phase for frequency coupling in a dual-frequency capacitively coupled plasma

D. O’Connell, T. Gans, E. Semmler, and P. Awakowicz

Appl. Phys. Lett. 93, 081502 (2008); http://dx.doi.org/10.1063/1.2972117 (3 pages) | Cited 15 times

Online Publication Date: 25 August 2008

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Frequency coupling in multifrequency discharges is a complex nonlinear interaction of the different frequency components. An alpha-mode low pressure rf capacitively coupled plasma operated simultaneously with two frequencies is investigated and the coupling of the two frequencies is observed to greatly influence the excitation and ionization within the discharge. Through this, plasma production and sustainment are dictated by the corresponding electron dynamics and can be manipulated through the dual-frequency sheath. These mechanisms are influenced by the relative voltage and also the relative phase of the two frequencies.
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52.80.Pi High-frequency and RF discharges
52.50.-b Plasma production and heating
52.40.Kh Plasma sheaths
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.35.Mw Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.)

Plasma characterization in a diode with a carbon-fiber cathode

V. Vekselman, J. Gleizer, D. Yarmolich, J. Felsteiner, Ya. Krasik, L. Liu, and V. Bernshtam

Appl. Phys. Lett. 93, 081503 (2008); http://dx.doi.org/10.1063/1.2976136 (3 pages) | Cited 12 times

Online Publication Date: 25 August 2008

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Results of optical and spectroscopic studies of the plasma formation at the surface of two types of carbon-fiber cathodes in a diode powered by an ∼ 200 kV accelerating pulse are presented. It was found that during the pulse, generation of the plasma occurs in a form of several millimeter size plasma spots. In the vicinity of the cathode surface the average plasma density and temperature were found to be ∼ 3×1014 cm−3 and ∼ 5 eV, respectively, for an electron current density of ∼ 22 A/cm2. The plasma expansion velocity toward the anode was found to be ∼ 1.5×106 cm/s during the first 150 ns of the accelerating pulse duration.
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52.75.Fk Magnetohydrodynamic generators and thermionic convertors; plasma diodes
52.70.-m Plasma diagnostic techniques and instrumentation
52.25.-b Plasma properties

Temperature-dependent transition of discharge pattern of He/air cryoplasma

Jai Hyuk Choi, Yuri Noma, Takaaki Tomai, and Kazuo Terashima

Appl. Phys. Lett. 93, 081504 (2008); http://dx.doi.org/10.1063/1.2976308 (3 pages) | Cited 7 times

Online Publication Date: 26 August 2008

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Dielectric barrier discharges were generated under atmospheric pressure at temperatures ranging from room temperature down to 88 K. The gas temperature of the plasma generated by the discharges was controlled by liquid nitrogen, and a mixture of helium and air was used as the discharge gas. We found that microdischarges exhibited temperature-dependent specific discharge patterns as the temperature decreased. This transition of discharge patterns was closely related to the change in the gap voltage at breakdown. A possible scenario that may explain the pattern of the transition of the microdischarges is discussed.
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52.25.-b Plasma properties
52.80.-s Electric discharges
52.50.Dg Plasma sources
07.20.Mc Cryogenics; refrigerators, low-temperature detectors, and other low-temperature equipment
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
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