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Physical limits for high ion charge states in pulsed discharges in vacuum

Journal of Applied Physics, ISSN: 0021-8979, Vol: 105, Issue: 4
2009
  • 15
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  • 22
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Metrics Details

  • Citations
    15
    • Citation Indexes
      15
  • Captures
    22

Article Description

Short-pulse high-current discharges in vacuum were investigated with the goal to maximize the ion charge state number. In a direct extension of previous work [G. Y. Yushkov and A. Anders, Appl. Phys. Lett. 92, 041502 (2008)], the role of pulse length, rate of current rise, and current amplitude was studied. For all experimental conditions, the usable (extractable) mean ion charge state could not be pushed beyond 7+. Instead, a maximum of the mean ion charge state (about 6+ to 7+ for most cathode materials) was found for a power of 2-3 MW dissipated in the discharge gap. The maximum is the result of two opposing processes that occur when the power is increased: (i) the formation of higher ion charge states and (ii) a greater production of neutrals (both metal and nonmetal), which reduces the charge state via charge exchange collisions. © 2009 American Institute of Physics.

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