Ion energy distributions in a permanent-magnet-expanded plasma containing an electric double layer

Kazunori Takahashi, Tamiya Fujiwara

Research output: Contribution to journalArticle

Abstract

Ion energy distribution functions are measured along the axis in a solenoid-free plasma expanded by permanent magnets (PMs). The source diameter, the working argon gas pressure, and the 13.56-MHz radio-frequency power are chosen as 6.5 cm, 0.35 mtorr, and 250 W, respectively. The divergent magnetic field of about 100 G in the source tube and of about a few gauss in the diffusion chamber is provided by the PMs. The contour image of the measured ion energy distributions clearly shows the electrostatic ion acceleration in the region where the local plasma potential rapidly drops over a few centimeters. The result also indicates a loss of the beam ions and an increase of the bulk ions in the diffusion chamber due to the charge exchange process between the beam ions and argon neutrals.

Original languageEnglish
Article number5875899
Pages (from-to)2444-2445
Number of pages2
JournalIEEE Transactions on Plasma Science
Volume39
Issue number11 PART 1
DOIs
Publication statusPublished - 2011 Nov 1
Externally publishedYes

Keywords

  • Ion acceleration
  • permanent magnets (PMs)
  • plasma propulsion

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Nuclear and High Energy Physics

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