Speaker
Mr
MD SHAHINUL ISLAM
(Plasma Research Center, University of Tsukuba)
Description
In the tandem mirror device GAMMA 10/PDX in University of Tsukuba, divertor simulation experiments were conducted for analyzing physical mechanism of detachment plasma [1-3]. The divertor simulation experimental module (D-module), in which a V-shaped target is mounted, was installed in the west end-cell of GAMMA 10/PDX. In the GAMMA 10/PDX, heat flux measurements have been carried out by using calorimeters. Each calorimeter consists of a substrate which is connected to thermocouple. The heat flux is evaluated from temperature difference (ΔT) between before and after plasma discharge and the plasma duration time [4]. The heat flux was measured at two different locations in GAMMA 10/PDX end-cell. The first one, calorimeters are installed at the lower V-shaped target and its corner. There are 13 calorimeters which installed on the lower V-shaped target. The calorimeters on V-shaped target consist of stainless steel substrate (φ10mm, 0.2mm in thickness) which is connected to thermocouple (K type). The second one, other type of calorimeter is installed near the west end mirror. The calorimeter in this point consist of copper substrate. This calorimeter is measured the heat flux in the case that additional heating experiments. Short and high heat-flux is generated by additional heating with electron cyclotron resonance heating (ECRH). The heat flux of additional heating is evaluated from temperature increment during plasma discharge with ECRH and without ECRH. In the heat flux measurements by using calorimeters on lower V-shaped target, reduction of the heat-flux was observed according to throughput of the noble gas. In the additional heating experiments, the dependence of the heat flux on the ECRH power was observed. The heat flux reaches about 15 MW/m$^{2}$ in the case with ECRH power 380kW. In this paper, detailed results of heat flux measurements are presented and the improvement of heat flux evaluation will be also discussed.
[1] Y. Nakashima, et al., Fusion Eng. Design 85, issue 6 (2010) 956. $\\$
[2] Y. Nakashima, et al., Trans. Fusion Sci. Technol. 59, No.1T (2011) 61. $\\$
[3] Y. Nakashima, et al., J. Nucl. Mater. 463 (2015) S537. $\\$
[4] M. Iwamoto, et al., Plasma Fusion. Res. 9, 3402121 (2014).
Primary author
Mr
Masato Ohuchi
(Plasma Research Center, University of Tsukuba)
Co-authors
Prof.
Hiroto Matsuura
(Osaka Prefecture University)
Mr
Kazuma Fukui
(Plasma Research Center, University of Tsukuba)
Mr
Kazuya Ichimura
(Plasma Research Center, University of Tsukuba)
Mr
Kohei Tsumura
(Plasma Research Center, University of Tsukuba)
Mr
MD SHAHINUL ISLAM
(Plasma Research Center, University of Tsukuba)
Mr
Md. Maidul Islam
(Plasma Research Center, University of Tsukuba)
Prof.
Mizuki Sakamoto
(Plasma Research Center, University of Tsukuba)
Dr
Naomichi Ezumi
(Plasma Research Center, University of Tsukuba)
Prof.
Ryutaro Minami
(Plasma Research Center, University of Tsukuba)
Mr
Takayuki Yokodo
(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.
Yousuke Nakashima
(Plasma Research Center, University of Tsukuba)
