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

Hiroki KAYANO; Seowon JANG; Mafumi HIRATA; Naomichi EZUMI; Hibiki YAMAZAKI; Kairi SUGATA; Takumi AIZAWA; Daichi NOGUCHI; Doyeon KIM; Yudai SUGIMOTO; Reina MATSUURA; Ryuya IKEZOE; Masayuki YOSHIKAWA; Makoto ICHIMURA; Mizuki SAKAMOTO

doi:10.1585/pfr.16.2402045

Regular Articles

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

Hiroki KAYANO, Seowon JANG, Mafumi HIRATA, Naomichi EZUMI, Hibiki YAMAZAKI, Kairi SUGATA, Takumi AIZAWA, Daichi NOGUCHI, Doyeon KIM, Yudai SUGIMOTO, Reina MATSUURA, Ryuya IKEZOE, Masayuki YOSHIKAWA, Makoto ICHIMURA, Mizuki SAKAMOTO

Author information

Hiroki KAYANO
Plasma Research Center, University of Tsukuba
Seowon JANG
Plasma Research Center, University of Tsukuba
Mafumi HIRATA
Plasma Research Center, University of Tsukuba
Naomichi EZUMI
Plasma Research Center, University of Tsukuba
Hibiki YAMAZAKI
Plasma Research Center, University of Tsukuba
Kairi SUGATA
Plasma Research Center, University of Tsukuba
Takumi AIZAWA
Plasma Research Center, University of Tsukuba
Daichi NOGUCHI
Plasma Research Center, University of Tsukuba
Doyeon KIM
Plasma Research Center, University of Tsukuba
Yudai SUGIMOTO
Plasma Research Center, University of Tsukuba
Reina MATSUURA
Plasma Research Center, University of Tsukuba
Ryuya IKEZOE
Research Institute for Applied Mechanics, Kyushu University
Masayuki YOSHIKAWA
Plasma Research Center, University of Tsukuba
Makoto ICHIMURA
Plasma Research Center, University of Tsukuba
Mizuki SAKAMOTO
Plasma Research Center, University of Tsukuba

Keywords: ICRF, ion heating, slow wave, difference-frequency wave, wave excitation, high density, shielding effect, mirror plasma

JOURNAL FREE ACCESS

2021 Volume 16 Pages 2402045

DOI https://doi.org/10.1585/pfr.16.2402045

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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 10¹⁹m⁻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.

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