Electron-beam enhancement of ion charge state fractions in the metal-vapor vacuum-arc ion source

Bugaev, Alexey; Gushenets, Vasily; Yushkov, George; Oks, Efim; Kulevoy, Timur; Hershcovitch, Ady; Johnson, Brant M.
August 2001
Applied Physics Letters;8/13/2001, Vol. 79 Issue 7
Academic Journal
We report demonstrations of ion charge-state enhancement for an electron-beam metal-vapor vacuum-arc (E-MEVVA) ion source. Results with a lead cathode yielded a maximum ion charge state of Pb[sup 7+], which implies an ionization potential of at least 130 eV. Electron current densities j=70 A/cm[sup 2] and ionization times τ≅100 μs produced jτ=9.2×10[sup -3] C/cm[sup 2] (5.8×10[sup 16] electrons/cm[sup 2]). Standard analysis for these conditions indicates—somewhat surprisingly—that successive single (stepwise) ionization accounts for the present observations, even though the charge states are substantially higher than most previous results with MEVVA-based ion sources. © 2001 American Institute of Physics.


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