Operation modes of hot-cathode plasma source for linear devices

Timur D. Akhmetov, Vladimir I. Davydenko, Alexandr A. Ivanov, Grigory I. Shulzhenko

Research output: Contribution to journalArticlepeer-review

Abstract

Operation of a plasma source with a hot disk cathode and a cylindrical hollow anode in axial magnetic field is sensitive to the cathode-to-anode diameter ratio. When the cathode edge maps along magnetic field lines to the inner anode surface, the discharge voltage is relatively low, and the plasma stream with moderate density occupies the entire cross-section of the anode bore. By contrast, when the cathode projection is fully inside the anode bore with the radial cathode-to-anode gap ~ 1 cm, the discharge voltage jumps to much higher values exceeding 250 V. The plasma density profile becomes Gaussian-like with the width matching the cathode radius according to magnetic flux surfaces. The plasma density in the high-voltage cross-field discharge reaches 10 13 cm -3 , and the discharge parameters almost do not change with magnetic field up to 1.5 kG in the anode area. This plasma source is suitable for the use in linear devices for plasma-material interaction studies.

Original languageEnglish
Article number2406004
Number of pages5
JournalPlasma and Fusion Research
Volume14
Issue numberSpecialissue1
DOIs
Publication statusPublished - 1 Jan 2019

Keywords

  • Cross-field discharge
  • Hollow anode
  • Lanthanum hexaboride cathode
  • Linear plasma device
  • cross-field discharge
  • linear plasma device
  • lanthanum hexaboride cathode
  • hollow anode

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