Temporal evolution of double layers in pulsed helicon plasmas

被引：11

作者：

Biloiu, Ioana A. ^{[1
,2
]}

Scime, Earl E. ^{[1
]}

机构：

[1] W Virginia Univ, Dept Phys, Morgantown, WV 26506 USA

[2] Univ Bucharest, Fac Phys, Bucharest 077125, Romania

来源：

APPLIED PHYSICS LETTERS | 2009年 / 95卷 / 05期

关键词：

helicons; plasma sheaths; LASER-INDUCED FLUORESCENCE; ION VELOCITY DISTRIBUTION; DYNAMICS;

D O I：

10.1063/1.3204014

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Delays of the order of tens of milliseconds in the appearance of the fast argon ion population in the expansion region of a pulsed helicon plasma are observed in time-resolved, laser induced fluorescence measurements. The fast ion population is a proxy for the presence of a double layer. The magnitude of the time delay depends strongly on the length of the interval between plasma pulses; the shorter the time between pulses, the shorter the time delay. The time delay approaches zero for inter-pulse intervals smaller than 30 ms. The double layer strength is not affected by plasma source modulation frequency.

引用

页数：3

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