Measurements of the total ion flux from vacuum arc cathodespots

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The ion flux from vacuum arc cathode spots was measured in two vacuum arc systems. The first was a vacuum arc ion source which was modified allowing us to collect ions from arc plasma streaming through an anode mesh. The second discharge system essentially consisted of a cathode placed near the center of a spherically shaped mesh anode. In both systems, the ion current streaming through the mesh was measured by a biased collector. The mesh anodes had geometric transmittances of 60 percent and 72 percent, respectively, which were taken into account as correction factors. The ion current from different ... continued below

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Anders, Andre; Oks, Efim M.; Yushkov, Georgy Yu; Savkin,Konstantin P.; Brown, Ian G. & Nikolaev, Alexey G. May 25, 2005.

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The ion flux from vacuum arc cathode spots was measured in two vacuum arc systems. The first was a vacuum arc ion source which was modified allowing us to collect ions from arc plasma streaming through an anode mesh. The second discharge system essentially consisted of a cathode placed near the center of a spherically shaped mesh anode. In both systems, the ion current streaming through the mesh was measured by a biased collector. The mesh anodes had geometric transmittances of 60 percent and 72 percent, respectively, which were taken into account as correction factors. The ion current from different cathode materials was measured for 50-500 A of arc current. The ion current normalized by the arc current was found to depend on the cathode material, with values in the range from 5 percent to 19 percent. The normalized ion current is generally greater for elements of low cohesive energy. The ion erosion rates were determined from values of ion current and ion charge states, which were previously measured in the same ion source. The absolute ion erosion rates range from 16-173 mu g/C.

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  • Journal Name: IEEE Transactions on Plasma Science; Journal Volume: 33; Journal Issue: 5; Related Information: Journal Publication Date: October 2005

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  • Report No.: LBNL--56758
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1109/TPS.2005.856502 | External Link
  • Office of Scientific & Technical Information Report Number: 876209
  • Archival Resource Key: ark:/67531/metadc875989

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  • May 25, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Sept. 30, 2016, 12:24 p.m.

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Anders, Andre; Oks, Efim M.; Yushkov, Georgy Yu; Savkin,Konstantin P.; Brown, Ian G. & Nikolaev, Alexey G. Measurements of the total ion flux from vacuum arc cathodespots, article, May 25, 2005; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc875989/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.