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

被引：12

作者：

Yushkov, Georgy Yu. ^{[1
]}

Anders, Andre ^{[2
]}

机构：

[1] Russian Acad Sci, Inst High Current Elect, Tomsk 634055, Russia

[2] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA

来源：

JOURNAL OF APPLIED PHYSICS | 2009年 / 105卷 / 04期

关键词：

charge exchange; discharges (electric); MAGNETIC-FIELD; ARC PLASMAS; DISTRIBUTIONS; PRESSURE;

D O I：

10.1063/1.3079501

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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.

引用

页数：5

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