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Identification of slow-wave ion cyclotron emission on JT-60U
https://repo.qst.go.jp/records/84242
https://repo.qst.go.jp/records/84242c5a3d985-08da-4397-a762-06595fb5919c
Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2021-09-28 | |||||
タイトル | ||||||
タイトル | Identification of slow-wave ion cyclotron emission on JT-60U | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
アクセス権 | ||||||
アクセス権 | metadata only access | |||||
アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
著者 |
Shuhei, Sumida
× Shuhei, Sumida× Koji, Shinohara× Ichimura, Makoto× Bando, Takahiro× Bierwage, Andreas× Shunsuke, Ide× Shuhei, Sumida× Koji, Shinohara× Bierwage, Andreas× Shunsuke, Ide |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Ion cyclotron emissions (ICEs) are generally considered to be emissions of fast waves driven by velocity-space instabilities due to fast ions. However, on JT-60U, measured properties of ICEs observed at frequencies lower than the bulk ion cyclotron frequency (L-ICEs) do not match the fast-wave dispersion relation, indicating the possibility of L-ICEs being slow-wave emissions. In this paper, we show that L-ICE observation on JT-60U can be explained in terms of a slow-wave emission driven by fast ions, i.e. a slow-wave ICE. To investigate whether the slow wave can be driven by fast ions, its linear growth rate has been calculated in a typical discharge using a wave dispersion code. This wave dispersion code is capable of performing calculations with an arbitrary spatially-localized velocity distribution. For the growth rate calculation, we have directly used fast ion velocity distributions evaluated by an orbit following Monte-Carlo simulation. It is found that negative-ion-source neutral beam (N-NB) injected fast ions can destabilize the slow wave. Its frequency and wavenumber at high linear growth rates are close to experimental observations of L-ICE. In addition, observed L-ICE frequencies agree reasonably well with frequencies based on the slow-wave dispersion relation at measured toroidal wavenumbers in several discharges. Moreover, the observed frequencies also agree with the Doppler-shifted cyclotron resonance frequencies for the N-NB injected ion. Therefore, L-ICE in JT-60U is identified as a slow-wave ICE driven by the N-NB injected fast ions and distinguished from other ICEs through a measurement of its frequency and wavenumber. | |||||
書誌情報 |
Nuclear Fusion 巻 61, p. 116036, 発行日 2021-11 |
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出版者 | ||||||
出版者 | IOP Publishing | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0029-5515 | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | 10.1088/1741-4326/ac2777 | |||||
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識別子タイプ | URI | |||||
関連識別子 | https://iopscience.iop.org/article/10.1088/1741-4326/ac2777 |