04E61PGAMMA10におけるプラズマパラメータ制御に向けたICRF加熱実験および3次元波動解析
ICRF experiment and three-dimensional wave analysis for controlling
plasma-parameters on GAMMA10
横山拓郎1, 市村真1, 福山淳2, 齋藤裕希1, 隅田脩平1, 平田真史1, 池添竜也1, 岩本嘉章1
飯村拓真1, 岡田拓也1, 渡邊和征1, 中嶋洋輔1，市村和也1
T. Yokoyama1, M. Ichimura1, A. Fukuyama2, Y. Saito1, S. Sumida1, M. Hirata1, R. Ikezoe1,et. al.
筑波大学 プラズマ研究センター1
京都大学工学研究科原子力工学専攻2
Plasma Research Center, University of Tsukuba1
Department of Nuclear Engineering, Graduate School of Engineering, Kyoto University2
On GAMMA10, waves in ion cyclotron range of frequency (ICRF) are used for producing and heatingplasmas, and keeping magneto-hydro dynamic (MHD) stability. On GAMMA10, there are five cells, which
are a central cell, two minimum-B anchor cells connected to both sides of the central cell and supplying
MHD stability, and plug/barrier cells. There are three types of ICRF antennas, which are Type-III antennas
for producing plasmas and heating anchor plasmas, Double Half Turn (DHT) antennas for heating central
plasmas, and Double Arc Type (DAT) antennas for heating anchor plasmas directly. In the west anchor cell,
there are two DAT antennas. One is installed in the central side for the midplane of the anchor cell, and theother is installed in the plug/barrier side. The former antenna is called the West Anchor Inner DAT(WAI-DAT) antenna, and the latter called the West Anchor Outer DAT (WAO-DAT) antenna. Divertor
simulation experiment progresses on GAMMA10, and requires high temperature and high density plasmas in
the plug/barrier cell. It has been observed that there is a strong relationship between density in the central celland ion-current to the end. In order to control plasma-parameters, the phase-control experiment has been
introduced. The phase-control experiment is performed by applying rf current to Type-III antenna andWAO-DAT or WAI-DAT antennas with phase-difference. These experiments can change plasma-parametersin the anchor cell effectively. In order to evaluate these changes, the three-dimensional full wave code
TASK/WF[1], in which parallel processing has been recently implemented, is used.
In this presentation, we discuss the dependence ofthe plasma-parameters on the phase-difference between
both antennas with experiments and the numericalsimulation. Figure 1 shows the relationship between
phase-difference and the intensity of the secondary
electron detector (SED) signal in the west anchor celland the ratio of line-integrated density in the central cellwithout anchor heating to with anchor heating. It is
confirmed that there are strong dependence of theseparameters on phase-difference. It is observed that theintensity of SED signal and the ratio of line-integrated
density have similar dependence on the phase-differencein the case of WAI-DAT antenna and different
dependence in WAO-DAT case. In the numericalsimulation with TASK/WF, wave electric field andantenna loading resistance in the case of thephase-control experiment are calculated.
This work is partially supported by the Fig.1 The relationship between phase-difference ofbidirectional collaborative research program of National two antennas and the SED signal in the west
anchor cell and the ratio of line-integrated density
Institute for Fusion Science, Japan (NIFS13KUGM077).
[1] A. Fukuyama et al., Proc. 20th Int. Conf. on Fusion
Energy 2004 TH/P2-3.

in the central cell without anchor heating to withanchor heating in the phase-control experiment.