Temporal evolution of double layers in pulsed helicon plasmas

被引:10
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
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
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页数:3
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