Speaker
Dr
Masaki Nishiura
(The University of Tokyo)
Description
While the stable high-beta (~ 1) confinement by a dipole magnetic field was successfully demonstrated with high-temperature electrons (Te > 10 keV) [1, 2], the heating of ions was a challenge. We have made two major progresses in this direction. (i) We developed a system for ion cyclotron resonance of frequency (ICRF) heating, and demonstrated the active heating of ions by launching a slow wave. The ion temperatures in the core region are increased in hydrogen, helium and deuterium plasmas. The differences of temperatures among ion species suggest a strong influence of the charge-exchange loss by which the bulk ions remain relatively cold (< 20 eV) in comparison with impurity ions. (ii) We also found a spontaneous heating mechanism concomitantly occurring with the up-hill diffusion [3, 4].
[1] H. Saitoh et al., Phys. Plasmas 21 (2014) 082511.
[2] M. Nishiura et al., Nucl. Fusion 55 (2015) 053019.
[3] N. Sato et al., http://arxiv.org/abs/1510.08571, in 2015.
[4] Y. Kawazura et al., Phys. Plasmas 22 (2015) 112503.
| Country or International Organization | Japan |
|---|---|
| Paper Number | EX/P3-47 |
Primary author
Dr
Masaki Nishiura
(The University of Tokyo)
Co-authors
Mr
Ankur Kashyap
(The University of Tokyo)
Prof.
Atsushi Fukuyama
(Kyoto University)
Mr
Haruhiko Saitoh
(University of Tokyo)
Mr
Masataka Nakatsuka
(The University of Tokyo)
Ms
Miyuri Yamasaki
(The University of Tokyo)
Mr
Noriki Takahashi
(The University of Tokyo)
Mr
Toshiki Mushiake
(The University of Tokyo)
Dr
Yohei Kawazura
(The University of Tokyo)
Dr
Yoshihisa Yano
(The University of Tokyo)
Prof.
Zensho Yoshida
(The University of Tokyo)
