Ion cyclotron resonance heating system in the RT-1 magnetospheric plasma

M. Nishiura, Y. Kawazura, Z. Yoshida, N. Kenmochi, Y. Yano, H. Saitoh, M. Yamasaki, T. Mushiake, A. Kashyap, N. Takahashi, M. Nakatsuka, A. Fukuyama

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

We have developed an ion cyclotron resonance frequency (ICRF) heating system for the Ring Trap 1 (RT-1) magnetospheric device. We excite slow waves from the polar region of the dipole magnetic field. The target helium plasma is produced by electron cyclotron heating. The electrons comprise high-temperature (>10 keV) and low-temperature (<100 eV) components with both typically exhibiting densities of the same order of magnitude. The ICRF heating causes an increase in the ion temperatures and toroidal flow velocities in the core plasma region. We observe appreciable temperature differences between the different ion species (main He+ and impurity C2+), suggesting a strong influence of the charge-exchange loss, which caused the bulk ions to remain relatively cold (∼20 eV) compared to the impurity ions (∼40 eV). By developing an electro-optical measurement system, we have measured the local wave electric field in the plasma.

Original languageEnglish
Article number086038
JournalNuclear Fusion
Volume57
Issue number8
DOIs
Publication statusPublished - 2017 Jul 12
Externally publishedYes

Keywords

  • ICRF heating
  • electric field
  • ion cyclotron wave
  • magnetospheric plasma
  • slow wave

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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