Observation of Ion Heating Using the Difference Frequency of Two ICRF Waves in GAMMA 10/PDX

• KAYANO Hiroki

  Plasma Research Center, University of Tsukuba

• JANG Seowon

  Plasma Research Center, University of Tsukuba

• HIRATA Mafumi

  Plasma Research Center, University of Tsukuba

• EZUMI Naomichi

  Plasma Research Center, University of Tsukuba

• YAMAZAKI Hibiki

  Plasma Research Center, University of Tsukuba

• SUGATA Kairi

  Plasma Research Center, University of Tsukuba

• AIZAWA Takumi

  Plasma Research Center, University of Tsukuba

• NOGUCHI Daichi

  Plasma Research Center, University of Tsukuba

• KIM Doyeon

  Plasma Research Center, University of Tsukuba

• SUGIMOTO Yudai

  Plasma Research Center, University of Tsukuba

• MATSUURA Reina

  Plasma Research Center, University of Tsukuba

• IKEZOE Ryuya

  Research Institute for Applied Mechanics, Kyushu University

• YOSHIKAWA Masayuki

  Plasma Research Center, University of Tsukuba

• ICHIMURA Makoto

  Plasma Research Center, University of Tsukuba

• SAKAMOTO Mizuki

  Plasma Research Center, University of Tsukuba

Abstract

GAMMA 10/PDX is a linear plasma confinement device that mainly uses slow waves in ion cyclotron range of frequencies (ICRF) for heating, and it can achieve a high ion temperature that is in the range of several keV. Although slow waves are effective for ion heating, it is difficult to excite them with antennas at high densities, such as those over 10¹⁹ m⁻³. In this study, we considered a way to excite a slow waves using the frequency difference of input waves. Two fast waves having different frequencies, which are both adequate for high-density plasma, were applied with antennas to excite a slow wave as a difference-frequency wave between the fast waves. As a result, the excitation of difference-frequency waves inside the plasma was confirmed from magnetic probe and reflectometry measurements, and an increase in diamagnetism was also observed. These results firstly demonstrate the possibility of slow-wave heating using a DF wave in a high-density linear plasma, where direct slow-wave heating is not feasible.

Journal

• Plasma and Fusion Research

  Plasma and Fusion Research 16 (0), 2402045-2402045, 2021-03-12

  The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

• ICRF
• ion heating
• slow wave
• difference-frequency wave
• wave excitation
• high density
• shielding effect
• mirror plasma

Details

• CRID: 1390850569192127488
• NII Article ID: 130008022670
• DOI: 10.1585/pfr.16.2402045
• ISSN: 18806821
• Web Site: https://www.jstage.jst.go.jp/article/pfr/16/0/16_2402045/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed