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12 May 2008

Volume 92, Issue 19, Articles (19xxxx)

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Appl. Phys. Lett. 92, 193301 (2008); http://dx.doi.org/10.1063/1.2920199 (3 pages)

Wei Chen, Hong Liang Zhang, Han Huang, Lan Chen, and Andrew Thye Shen Wee
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Spectroscopic measurement of electric field in dielectric barrier discharge in helium

B. M. Obradović, S. S. Ivković, and M. M. Kuraica

Appl. Phys. Lett. 92, 191501 (2008); http://dx.doi.org/10.1063/1.2927477 (3 pages) | Cited 7 times

Online Publication Date: 13 May 2008

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Spatial distribution of electric field strength in dielectric barrier discharge in helium is determined from the Stark splitting and shifting of two visible helium lines and their forbidden components. Electric field is calculated by using spectral distance between forbidden and allowed components and results are compared to those obtained by using forbidden/allowed intensity ratio. Distributions of electric field, obtained for 200 and 800 mbar pressures, are typical for the glow mode of the discharge.
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52.80.Hc Glow; corona
52.70.Kz Optical (ultraviolet, visible, infrared) measurements

Ion beam acceleration in a divergent magnetic field

Ioana A. Biloiu, Earl E. Scime, and Costel Biloiu

Appl. Phys. Lett. 92, 191502 (2008); http://dx.doi.org/10.1063/1.2927478 (3 pages) | Cited 16 times

Online Publication Date: 13 May 2008

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Two-dimensional argon ion velocity distribution functions (IVDFs) in the expansion region of a helicon plasma source have been measured by laser-induced-fluorescence tomography. Below a threshold value of the magnetic field in the expansion region, the IVDFs show a bimodal structure comprised of a supersonic ion population axially moving away from the source and an isotropic, slow, background, ion population. Increasing the magnetic field divergence leads to an increase in the axial speed of the supersonic component. A maximum axial speed of ∼ 2.9cs was obtained for a source/expansion magnetic field ratio of 43.
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52.40.Mj Particle beam interactions in plasmas
52.50.Dg Plasma sources

Experimental study of space-charge-limited flows in a nanogap

Sudeep Bhattacharjee, Adish Vartak, and Victor Mukherjee

Appl. Phys. Lett. 92, 191503 (2008); http://dx.doi.org/10.1063/1.2928232 (3 pages) | Cited 8 times

Online Publication Date: 14 May 2008

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An experimental investigation of space-charge-limited flow of current in a nanogap is presented. Electrodes with gap size d ∼ 70–110 nm corresponding to d/λ0 ∼ (1−5)×103, where λ0 is the de Broglie wavelength of the space-charge electrons are experimented. Unlike classical Child–Langmuir’s (CL) law, the current density varies as square root of applied voltage (V1/2), when d becomes comparable to λ0. Additionally, a transition regime has been found for the 90 nm gap size where the CL law appears at voltages >45 V. At d = 110 nm, the system is found to exhibit purely classical behavior.
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73.40.-c Electronic transport in interface structures
73.63.-b Electronic transport in nanoscale materials and structures

Experimental demonstration of relativistic magnetron with modified output configuration

M. Daimon, K. Itoh, G. Imada, and W. Jiang

Appl. Phys. Lett. 92, 191504 (2008); http://dx.doi.org/10.1063/1.2930684 (3 pages) | Cited 15 times

Online Publication Date: 15 May 2008

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A modified configuration of relativistic magnetron with diffraction output has been investigated experimentally by using repetitive pulsed power generator “ETIGO-IV” (400 kV, 13 kA, 120 ns, 1 Hz). The purpose is to verify the improved microwave conversion efficiency predicted by numerical simulations [ M. Daimon and W. Jiang, Appl. Phys. Lett. 91, 191503 (2007) ]. The experiments have concentrated on comparison between the output microwave powers obtained by using the modified and the conventional configurations of relativistic magnetron. The results have been in general agreement with that obtained by the simulations.
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84.40.Fe Microwave tubes (e.g., klystrons, magnetrons, traveling-wave, backward-wave tubes, etc.)
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