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Probe diagnostics of anisotropic plasma in a hollow cathode arc

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2 Author(s)
Klagge, S. ; Ernst‐Moritz‐Arndt‐Universität Greifswald, Fachbereich Physik Domstrasse 10a, 0‐2200 Greifswald, Federal Republic of Germany ; Lunk, A.

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Measuring the second derivatives of electron retarded current characteristics of a plane probe at different angle positions, the coefficients f*i(ϵ) of the velocity distribution function developed as a Legendre polynomial are determined for the anisotropic plasma of a hollow cathode arc discharge. The integral values deduced from this for the electron concentration ne and the mean electron energy ϵ¯, as well as the drift velocity vd, show only a limited dependence on the number of angle positions used for measurement. Even for measurements at a single angle position (Druyvesteyn method), the values obtained for ne, ϵ¯, and vd differ by less than 10% from the corresponding values measured with the multiposition method, so long as vdrift ≤ vthermal. On the contrary, the shape of f*i(ϵ), like the angle dependence f*(θ)ϵ=const, is clearly affected by the number of angle positions used. A Maxwell distribution superimposed by a group of directed fast electrons proves to be a sufficient model for the plasma investigated here.

Published in:

Journal of Applied Physics  (Volume:70 ,  Issue: 1 )

Date of Publication:

Jul 1991

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