Dependence of plasma parameters in hydrogen discharges on magnetic field configuration and neutral pressure in the DT-ALPHA device

Tomohiro Seino, Hiroyuki Takahashi, Peerapat Boonyarittipong, Takeshi Saikyo, Kenta Ogasawara, Atsushi Okamoto, Sumio Kitajima, Kenji Tobita

Research output: Contribution to journalArticlepeer-review

Abstract

The dependence of hydrogen plasma parameters on magnetic field configuration and neutral pressure was investigated in the radio-frequency (RF) plasma source DT-ALPHA. It was found that higher electron density was obtained when the lower hybrid resonance condition was satisfied near the RF antenna. It was also found that use of lower hydrogen neutral pressure yielded higher electron density plasma. By optimizing the resonance condition and neutral pressure, the hydrogen plasma of Te ~ 10 eV and ne > 1 x 1017 m-3 was achieved.

Original languageEnglish
Article number1056
JournalPlasma and Fusion Research
Volume15
DOIs
Publication statusPublished - 2020

Keywords

  • DT-ALPHA
  • Divertor
  • Hydrogen plasma
  • Radio-frequency plasma
  • Volumetric recombination

ASJC Scopus subject areas

  • Condensed Matter Physics

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