Determination of the specific ion erosion of the vacuum arc cathode by measuring the total ion current from the discharge plasma |
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| Authors: | A Anders E M Oks G Yu Yushkov K P Savkin Y Brown A G Nikolaev |
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| Institution: | (1) Lawrence Berkeley National Laboratory, University of California, Berkeley, California, USA;(2) Institute of High-Current Electronics, Siberian Division, Russian Academy of Sciences, Akademicheskiĭ pr. 4, Tomsk, 634055, Russia |
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| Abstract: | The specific ion erosion γi of cathodes made of C, Mg, Al, Ti, Co, Cu, Y, Mo, Cd, Sm, Ta, W, Pt, Pb, and Bi is determined by measuring the total ion current from the vacuum arc plasma. It is demonstrated that the ratio of the total ion current to the discharge current, αi in a vacuum arc varies from 5 to 19%, depending on the cathode material. It is found experimentally that the ion current fraction αi is inversely proportional to the atomic bond energy of the cathode material. It is shown that an increase in the total ion current extracted from the discharge plasma when applying an external magnetic field to the cathode region of the discharge is related solely to the appearance of ions with higher charge numbers in the plasma, while the magnitude of the specific ion erosion γi remains unchanged. |
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