High-density blue-mode argon plasma under an expanding magnetic field provided by permanent magnets

Kazunori Takahashi, Yutaka Shida, Hisashi Chiba, Tamiya Fujiwara

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


A 13-cm-diameter magnetically expanding plasma source using only permanent magnets and a high-power radio frequency (RF) generator of 13.56 MHz are installed in the Large diameter Permanent Magnets expanding Plasma machine at I wate University. The source is preliminarily operated for 500-W and 3-kW RF powers of 13.56 MHz in argon of 0.2 Pa. The double concentric arrays of the permanent magnets can provide expanding magnetic fields of about 80 G in the source tube and about 10 G at 30 cm downstream of the source exit. A purple light emission is seen for low-power condition of 500 W, while a blue-mode argon plasma is observed for high-power operation of 3 kW. The blue light emission implies the production of the high-density plasma by helicon mode discharge. In this paper, the images of the plasmas are presented.

Original languageEnglish
Article number5771128
Pages (from-to)2438-2439
Number of pages2
JournalIEEE Transactions on Plasma Science
Issue number11 PART 1
Publication statusPublished - 2011 Nov
Externally publishedYes


  • Helicon wave discharges
  • permanent magnets
  • plasma production
  • plasma propulsion

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Condensed Matter Physics


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