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26 Dec 2005

Volume 87, Issue 26, Articles (26xxxx)

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Appl. Phys. Lett. 87, 263102 (2005); http://dx.doi.org/10.1063/1.2150278 (3 pages)

Z. Zhong, G. Katsaros, M. Stoffel, G. Costantini, K. Kern, O. G. Schmidt, N. Y. Jin-Phillipp, and G. Bauer
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Longitudinal profiles of plasma parameters in a laser-ignited capillary discharge and implications for laser wakefield accelerator applications

M. Levin, A. Pukhov, R. F. Hubbard, D. Kaganovich, D. F. Gordon, P. Sprangle, A. Ting, B. Hafizi, and A. Zigler

Appl. Phys. Lett. 87, 261501 (2005); http://dx.doi.org/10.1063/1.2149183 (3 pages) | Cited 13 times

Online Publication Date: 28 December 2005

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The evolution of longitudinal electron density and temperature profiles in plasma channel produced by a low-current Plexiglas capillary discharge with laser ignition was investigated by spectroscopic methods. The plasma was produced by an electric discharge using a 0.5 mm diameter, 15 mm long Plexiglas capillary. The electron density measured in near-outlet region was found to be lower by 30%. Simulations show that this variation of the plasma density near the entrance of the capillary can pose substantial difficulties for external injection of electrons for laser wakefield accelerator applications.
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52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.50.Dg Plasma sources
52.80.-s Electric discharges
52.38.-r Laser-plasma interactions
52.65.-y Plasma simulation

Dielectric barrier hollow cathode discharge and its enhanced performance for light source

Tae Il Lee, Ki Wan Park, Hong Koo Baik, and Seong-Min Lee

Appl. Phys. Lett. 87, 261502 (2005); http://dx.doi.org/10.1063/1.2150274 (3 pages) | Cited 2 times

Online Publication Date: 29 December 2005

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We invented the dielectric barrier hollow cathode discharge (DBHCD) configuration as a novel light source and studied on the physical properties of discharge and the possibility of the parallel operation of many holes of the DBHCD without additional impedances such as inductance or capacitance. The electrical characteristics and the photo images of discharges sustained in cavity were investigated. The experimental result showed that the surface discharge mode was transformed into a hollow cathode mode according to a decrease of the pD (operating pressure times hole diameter). The parallel operation of the 13 arrays of DBHCD was also possible without additional impedances for limiting current. We measured the relative IR emission efficiency of the coplanar dielectric barrier discharge (CDBD) and DBHCD to evaluate the enhanced performance as light sources. According to the experiment, the 25 arrays of DBHCD result in 30%-enhanced performance in IR emission efficiency compared with CDBD.
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52.80.Hc Glow; corona
52.70.Ds Electric and magnetic measurements
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.25.Fi Transport properties
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