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

doi:10.1585/pfr.15.1201056

Rapid Communications

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

Author information

Keywords: divertor, volumetric recombination, hydrogen plasma, radio-frequency plasma, DT-ALPHA

JOURNAL FREE ACCESS

2020 Volume 15 Pages 1201056

DOI https://doi.org/10.1585/pfr.15.1201056

Details

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 T_e∼ 10 eV and n_e> 1 × 10¹⁷m⁻³was achieved.

Corresponding author

Register with J-STAGE for free!