Plasma and Fusion Research

Volume 13, 3402043 (2018)

Regular Articles

RF Wave Detection with High-Frequency Magnetic Probes in LHD
Kenji SAITO1), Hiroe IGAMI1), Mieko TOIDA1), Tsuyoshi AKIYAMA1,2), Shuji KAMIO1), Ryosuke SEKI1,2) and LHD Experiment Group
1)
National Institute for Fusion Science, National Institutes of Natural Sciences, Toki, Gifu 509-5292, Japan
2)
SOKENDAI (The Graduate University for Advanced Studies), Department of Fusion Science, Toki, Gifu 509-5292, Japan
(Received 28 December 2017 / Accepted 27 March 2018 / Published 24 April 2018)

Abstract

The study of radio frequency (RF) waves was accelerated by the start of deuterium experiments in the Large Helical Device (LHD) and the introduction of wide-band and long-time data acquisition system. The mass dependency of Ion Cyclotron Emissions (ICEs) driven by perpendicular Neutral Beam Injection (NBI) was clarified by the injection of deuterium beams. Another type of ICE by the tangential beam injection was found in the LHD. Although the details of this type of ICE have not yet been elucidated, a clear linear dependency of its frequency on the magnetic field strength divided by the mass of beam species was found. Non-localized RF waves in the Lower Hybrid Wave (LHW) frequency region were also detected during the injection of a perpendicular beam. It is shown that the frequency increases with the electron density.

Keywords

radio frequency wave, ion cyclotron emission, lower hybrid wave, magnetic probe, large helical device, neutral beam injection

DOI: 10.1585/pfr.13.3402043

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