From: Ray Boxman <boxman@eng.tau.ac.il>
Newsgroups: sci.physics.plasma
Subject: Unipolar arcs
Organization: Tel Aviv University

Unipolar arcs are basically cathode spots which ignite on the wall of
the chamber due to their selective negative charging from the more
mobile free electrons in the plasma, even though the wall is
electrically floating. The cathode spot of a vacuum arc is a
concentrated region of electrical current and vapor emission from the
cathode of an arc discharge.

Hope this is helpful.

Regards,
Ray Boxman


--
Prof. Raymond (Reuven) Boxman
Electrical Discharge and Plasma Laboratory
Tel Aviv University
POB 39040
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Israel

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