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21 Jan 2002

Volume 80, Issue 3, pp. 341-531

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Wall sheath and optimal bias in magnetic filters for vacuum arc plasma sources

T. Zhang, Y. C. Zhang, P. K. Chu, and I. G. Brown

Appl. Phys. Lett. 80, 365 (2002); http://dx.doi.org/10.1063/1.1431690 (3 pages) | Cited 13 times

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A plasma diffusion model is established to determine the optimal bias and sheath patterns in a positively biased magnetic filter of a metal arc plasma source. We determine the equation for the optimal bias on the magnetic filter. According to our model, the optimal bias is related to the electron speed, ion speed, ion mass, ion charge state, and plasma density in the filter. The optimal bias increases as these variables are increased with the exception of the electron speed. Even though the magnetic field is taken into account, it is not a variable in the final equation. Our experimental results confirm that the magnetic field has almost no influence on the optimal bias. An alternate design approach is suggested that should lead to enhanced plasma transport through the filter. © 2002 American Institute of Physics.
Show PACS
52.50.Dg Plasma sources
52.80.Mg Arcs; sparks; lightning; atmospheric electricity
52.80.Vp Discharge in vacuum
52.40.Kh Plasma sheaths

Characterization of a high-density plasma produced by electrothermal capillary discharge

J. U. Kim and H. Suk

Appl. Phys. Lett. 80, 368 (2002); http://dx.doi.org/10.1063/1.1435807 (3 pages) | Cited 9 times

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The characteristics of a pulsed plasma jet originating from an electrothermal capillary discharge are reported from optical emission spectroscopy as well as from laser-induced fluorescence (LIF) measurement. The results show that the plasma temperature and electron density jump across the Mach disk. Their values are approximately 25 000 and 14 000 K downstream and upstream of the Mach disk, and the corresponding electron densities are about 1018 and 1017 cm−3, respectively. By applying the LIF imaging method in the highly luminous underexpanded region of the plasma jet, a spatially well-resolved flow field was achieved. © 2002 American Institute of Physics.
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52.30.-q Plasma dynamics and flow
52.25.-b Plasma properties
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
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