Plasma and Fusion Research
Online ISSN : 1880-6821
ISSN-L : 1880-6821
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Observation of Ion Heating Using the Difference Frequency of Two ICRF Waves in GAMMA 10/PDX
Hiroki KAYANOSeowon JANGMafumi HIRATANaomichi EZUMIHibiki YAMAZAKIKairi SUGATATakumi AIZAWADaichi NOGUCHIDoyeon KIMYudai SUGIMOTOReina MATSUURARyuya IKEZOEMasayuki YOSHIKAWAMakoto ICHIMURAMizuki SAKAMOTO
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2021 Volume 16 Pages 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 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.

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© 2021 by The Japan Society of Plasma Science and Nuclear Fusion Research
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