Speaker
Mr
Yousuke Nakashima
(Japan)
Description
In this paper, detailed characteristics and controllability of plasmas emitted from the end-cell of the GAMMA 10 tandem mirror are described from the viewpoint of divertor simulation studies. In the case of only ICRF plasma, the heat flux of 0.8 MW/m^2 has already been achieved and proportionally increased with the ICRF power for ion heating. The energy analysis of ion flux by using end-loss ion energy analyzer (ELIEA) proved that the obtained high ion temperature (100 - 400 eV) was comparable to SOL plasma parameters in toroidal devices and was controlled by changing the ICRF power. Parallel ion temperature Ti// determined from the probe and calorimeter shows a linear relationship with the stored energy in the central-cell and agrees with the results of ELIEA. Recently additional plasma heating experiment using ICRF in the anchor-cell (RF3) was carried out in order to improve the performance. The time behavior of the plasma line-density and end-loss ion flux is shown in Fig. 4. A significant enhancement of the line-density is observed and the resultant ion flux becomes two times higher than that without RF3. The particle flux is estimated to be 6.5×10^22 particles/s•m^2, which indicate an effectiveness of additional heating with ICRF wave in the neighboring cells toward the improved E-divertor experiments for achieving the targeted parameters of this project (PHEAT ~20 MW/m^2, Γi = 10^23-24/ m^2 sec).
We have started various experiments such as radiator gas injection onto the tungsten target and visible measurement of plasma-gas-material interactions with a fast camera. Numerical simulation studies have also started in the end-cell for understanding the behavior of plasmas in divertor simulation experiments. In this spring a large-sized divertor experimental module will be installed and radiative cooling experiments of the end-cell plasma are planned by using gas injection into the module for realizing the detached plasma condition.
[1] Y. Nakashima, et al., Fusion Eng. Design volume 85 issue 6 (2010) 956-962.
[2] Y. Nakashima, et al., Trans. Fusion Sci. Technol. 59 No.1T (2011) 61-66.
This work is supported by the bidirectional collaboration research program with National Institute for Fusion Science.
Country or International Organization of Primary Author
Japan
Primary author
Mr
Yousuke Nakashima
(Japan)
Co-authors
Prof.
Akio Sagara
(National Institute for Fusion Science)
Prof.
Akira Tonegawa
(Graduate school of Science, Tokai University)
Prof.
Akiyoshi Hatayama
(Faculty of Science and Technology, Keio University)
Mr
Hideaki Ueda
(Plasma Research Center, University of Tsukuba)
Dr
Hiroto Matsuura
(Radiation Research Center, Osaka Prefecture University)
Mr
Hisato Takeda
(Plasma Research Center, University of Tsukuba)
Prof.
Isao Katanuma
(University of Tsukuba)
Dr
Junko Kohagura
(Plasma Research Center, University of Tsukuba)
Mr
Katsuhiro Hosoi
(Plasma Research Center, University of Tsukuba)
Mr
Kazuya Ichimura
(Plasma Research Center, University of Tsukuba)
Dr
Mafumi Hirata
(Plasma Research Center, University of Tsukuba)
Prof.
Makoto Ichimura
(Plasma Research Center, University of Tsukuba)
Dr
Mamoru Shoji
(National Institute for Fusion Science)
Dr
Masayuki Yoshikawa
(University of Tsukuba)
Mr
Mitsunori Toma
(Faculty of Science and Technology, Keio University)
Prof.
Mizuki Sakamoto
(Plasma Research Center, University of Tsukuba)
Dr
Nobuhiro Nishino
(Graduate school of Engineering, Hiroshima University)
Dr
Nobuyuki Asakura
(Japan Atomic Energy Agency)
Prof.
Noriyasu Ohno
(Graduate school of Engineering, Nagoya University)
Dr
Ryutaro MINAMI
(Plasma Research Center, University of Tsukuba)
Dr
Ryuuya Ikezoe
(Plasma Research Center, University of Tsukuba)
Dr
Shinji Nagata
(Institute for Material Research, Tohoku University)
Dr
Shinnichiro Kado
(Department of Nuclear Engineering and Management, The University of Tokyo)
Dr
Suguru Masuzaki
(National Institute for Fusion Science)
Prof.
Tatsuo Shikama
(Institute for Material Research, Tohoku University)
Mr
Tetsuo Furuta
(Faculty of Science and Technology, Keio University)
Dr
Tomoharu Numakura
(Plasma Research Center, University of Tsukuba)
Prof.
Tsuyoshi Imai
(Plasma Research Center, University of Tsukuba)
Dr
Tsuyoshi Kariya
(Plasma Research Center, University of Tsukuba)
Prof.
Yoshihiko Hirooka
(National Institute for Fusion Science)
Prof.
Yoshio Ueda
(Graduate school of Engineering, Osaka University)
