16 citations · 40 across the 8 of their papers we have counts for
8 papers
A scaling law of the neutral opacity and Balmer- wing shape in high-temperature plasmas
Keisuke Fujii, Masahiro Hasuo, Motoshi Goto +1
Hydrogen atoms penetrating deep inside high-temperature magnetically confined plasmas by repetitive charge-exchange collisions result in a particle source, which affects the plasma…
Plasma-Parameter Dependence of Ro-Vibrational Temperatures for in LHD Divertor
Keisuke Fujii, Tsubasa Oshioka, Atsushi Niihama +5
We analyzed a thousand visible spectra of Fulcher- band measured for divertor plasmas in Large Helical Device. With a coronal model and Baysian inference, the population distrib…
Stable Energy Distribution of Weakly Dissipative Gasses under Collisional Energy Cascades
Keisuke Fujii, Jun Imano, Arseniy Kuzmin +2
Collisional thermalization of a particle ensemble under the energy dissipation can be seen in variety of systems, such as heated granular gasses and particles in plasmas. Despite i…
Visible emission spectroscopy of highly charged tungsten ions in LHD: II. Evaluation of tungsten ion temperature
K Fujii, Y Takahashi, Y Nakai +5
We demonstrated a polarization-resolved high resolution spectroscopy of a visible emission line of highly charged tungsten ions (λ0 = 668.899 nm, Shinohara et al Phys. Scr. 90 1254…
Visible emission spectroscopy of highly charged tungsten ions in LHD: I. Survey of new visible emission lines
M Shinohara, K Fujii, D Kato +5
We found 12 unknown visible emission lines from the core plasma of large helical device with highly charged tungsten ions accumulated. The observation was made with our home-built…
Population kinetics of many-electron atoms in ionizing plasmas studied using a continuous collisional radiative model
Akira Nishio, Julian C. Berengut, Masahiro Hasuo +1
Collisional--radiative (CR) models based on \textit{ab initio} atomic structure calculation have been utilized over 20 years to analyze many-electron atomic and ionic spectra. Alth…