Abstract This paper develops a humped spiral antenna of top inductively coupled plasma with variable gap. Comparing with planar spiral antennae, it investigates the performance of humped spiral antennae in the calculated electromagnetic configurations and experimental results. It finds that the humped antenna has the improved uniformity of plasma density in the radial direction and the decreased electron temperature in the top inductively coupled plasma. By experimental and theoretical analyses, the plasma performance in the case of humped antennae is considered to be the combined results of the uniform electromagnetic configurations and the depressed capacitively coupling effect.
Received: 02 March 2008
Revised: 12 March 2008
Accepted manuscript online:
PACS:
52.40.Fd
(Plasma interactions with antennas; plasma-filled waveguides)
Fund: Project supported by National
Natural Science Foundation of China (Grant No 50577009).
Cite this article:
Xu Xu (徐 旭), Li Lin-Sen (李林森), Liu Feng (刘 峰), Zhou Qian-Hong (周前红), Liang Rong-Qing (梁荣庆) Improving the uniformity of RF-plasma density by a humped variable-gap spiral antenna 2008 Chin. Phys. B 17 4242
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