1995
DOI: 10.1088/0022-3727/28/4/014
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Estimating cathodic plasma jet parameters from the vacuum arc charge state distribution

Abstract: An analysis of the ion charge distribution measurements in a vacuum arc plasma has been carried out. It has been demonstrated that, by using the Saha equation, one can determine the electron temperature Te and density Ne in the cathode spot plasma. It has also been shown that it is possible to estimate a microspot diameter d and a current density j in the microspot by applying a theoretical model. The values obtained for Te approximately=4-10 eV, Ne approximately=1026-1028 m-3, d approximately=0.2-0.5 mu m and… Show more

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Cited by 18 publications
(7 citation statements)
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“…But one may assume that a onedimensional model remains valid for the axis of a real twodimensional plasma jet. In our previous papers [1,4,5] some analytical relations between the jet parameters I and d and the plasma parameters at the critical point have been obtained. We have…”
Section: Cathodic Plasma Jet Modelmentioning
confidence: 99%
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“…But one may assume that a onedimensional model remains valid for the axis of a real twodimensional plasma jet. In our previous papers [1,4,5] some analytical relations between the jet parameters I and d and the plasma parameters at the critical point have been obtained. We have…”
Section: Cathodic Plasma Jet Modelmentioning
confidence: 99%
“…Here T * , N * , W * and z * are the temperature and density of electrons and the energy and mean charge of ions at the critical point, located at the distance of d/4 from the cathode surface [5]; µ is the ion mass in atomic mass units. Assuming the solid angle of the plasma microjet to be close to one and the ratio of the ion current to the entire current to be of the order of one tenth [1,4], we have C 1 ≈ 10 −5 eV 5/2 A −1 m and C 2 ≈ 7 × 10 13 eV 1/2 A −1 m −1 . As the Coulomb logarithmic term we can adopt the modified form, proposed by Zollweg and Liebermann [6]:…”
Section: Cathodic Plasma Jet Modelmentioning
confidence: 99%
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“…In the initial stage of vacuum breakdown when the plasma jet length is of the order of the cathodic microspot diameter d 1-10 µm [12][13][14] and significantly less than the interelectrode gap length l 1 cm, the cathodic plasma is expanding spherically and has the kinetic pressure p ≈ NT which far exceeds the magnetic pressure p B = B 2 /(8π). For example, at the distance x * ≈ d/4 from the cathode surface, where a transition to supersonic plasma flow occurs, the electron temperature and density are close to their maximum values [3][4][5] A cathodic current-carrying plasma jet is transversally pinched by its own magnetic field and is longitudinally accelerated along the axis where the field is zero.…”
mentioning
confidence: 99%