Abstract
Unipolar arcs are characterized by spots emitting electrons at a wall. These electrons form a monoenergetic electron component in the plasma which may be detected by a double probe. With a simple model, probe characteristics, influenced by such an electron component, are constructed. In an experimental application a plasma beam produced by an accelerator bombards a wall. Arc tracks are found. For different probe-wall geometries characteristics are taken and interpreted by our model. Future application of this method is seen in measuring the possible effect of depression of arcing by a suitable plasma treatment of a wall.
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