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14 Apr 2003

Volume 82, Issue 15, pp. 2371-2540

Issue Cover Spotlight Figure

Appl. Phys. Lett. 82, 2491 (2003); http://dx.doi.org/10.1063/1.1566791 (3 pages)

Jun Li, Qi Ye, Alan Cassell, Hou Tee Ng, Ramsey Stevens, Jie Han, and M. Meyyappan
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Switching and regulation of a pulsed discharge channel in a coplanar plasma tetrode

Osamu Sakai, Satoshi Hashimoto, and Akitsugu Hatano

Appl. Phys. Lett. 82, 2392 (2003); http://dx.doi.org/10.1063/1.1567826 (3 pages) | Cited 5 times

Online Publication Date: 7 April 2003

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Control of a pulsed coplanar discharge by two-dimensional potential tailoring is investigated experimentally in a flat tetrode configuration. One pair of electrodes generates a coplanar discharge, and the other electrodes play roles of switching and controlling the discharge current by changing their electrical potential, where their electrical isolation from the discharge channel is kept without an insulator layer. All the electrodes are cold and arranged on a completely flat plate immersed in discharge gas with the pressure which is in the region to the right of and near the minimum sparking voltage condition. © 2003 American Institute of Physics.
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84.47.+w Vacuum tubes
52.80.-s Electric discharges

Quantum screening effects on occurrence scattering time for elastic collisions in electron–positron plasmas

Young-Dae Jung

Appl. Phys. Lett. 82, 2395 (2003); http://dx.doi.org/10.1063/1.1567052 (3 pages) | Cited 2 times

Online Publication Date: 7 April 2003

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Quantum screening effects on the occurrence time advance or delay for elastic collisions in electron-positron plasmas are investigated using the corrected Kelbg potential taking into account the classical effect as well as the quantum-mechanical effect. The eikonal method is applied to obtain the scattering amplitudes for electron–electron, positron–positron, and electron–positron elastic collisions in electron–positron plasmas. The results show that the occurrence time delay for electron–electron and positron–positron collisions increases with increasing plasma temperature. However, it is found that the occurrence time advance for electron–positron collisions has the maximum value at the temperature kBT≈4.5 eV and decreases with increasing the plasma temperature. © 2003 American Institute of Physics.
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52.20.Fs Electron collisions
52.25.Kn Thermodynamics of plasmas
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