Plasma and Fusion Research

Volume 14, 2402055 (2019)

Regular Articles

Investigation of ICRF Heating Effect in Anchor Region on GAMMA 10/PDX
Mafumi HIRATA, Junpei ITAGAKI, Ryuya IKEZOE1), Makoto ICHIMURA, Shuhei SUMIDA, Seowon JANG, Koki IZUMI, Atsuto TANAKA, Yushi KUBOTA, Ryo SEKINE, Hiroki KAYANO, Mizuki SAKAMOTO and Yousuke NAKASHIMA
Plasma Research Center, University of Tsukuba, Tsukuba 305-8577, Japan
1)
Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
(Received 30 September 2018 / Accepted 3 February 2019 / Published 22 March 2019)

Abstract

To investigate end-loss plasma control, several heating operations were carried out using ion-cyclotron range of frequency (ICRF) heating systems in GAMMA 10/PDX. In anchor region, one of the important heating positions to control the end loss particle and heat fluxes, excited ICRF waves are measured as the density fluctuations using an upgraded reflectometer system and the detailed radial profiles are observed. The efficiency of anchor heating was changed using the phase control between two antennas installed in the anchor and/or the central region. The interference of two waves during a phase-control ICRF heating has been directly measured inside the plasma. In addition, several phase dependencies were observed using absorption methods with photodiode in anchor region.

Keywords

GAMMA 10/PDX, ICRF, anchor region, phase control, microwave reflectometer, absorption method

DOI: 10.1585/pfr.14.2402055

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