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Observation of second harmonic electron cyclotron resonance heating and current-drive transition during non-inductive plasma start-up experiment in QUEST
https://repo.qst.go.jp/records/85237
https://repo.qst.go.jp/records/85237878c3e0a-df2c-4bd8-aebc-6540ff6ff43e
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2022-03-14 | |||||
| タイトル | ||||||
| タイトル | Observation of second harmonic electron cyclotron resonance heating and current-drive transition during non-inductive plasma start-up experiment in QUEST | |||||
| 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 |
Shinichiro, Kojima
× Shinichiro, Kojima× Hanada, Kazuaki× Idei, Hiroshi× Onchi, Takumi× Ikezoe, Ryuya× Nagashima, Yoshihiko× Hasegawa, Makoto× Kuroda, Kengoh× Nakamura, Kazuo× Higashijima, Aki× Nagata, Takahiro× Kawasaki, Shoji× Shimabukuro, Shun× Elserafy, Hatem× Masaharu, Fukuyama× Ejiri, Akira× Taiichi, Shikama× Yoneda, Nao× Yoneda, Ryota× Kariya, Tsuyoshi× Takase, Yuichi× Murakami , Sadayoshi× Bertelli, Nicola× Ono, Masayuki× Shinichiro, Kojima× Hanada, Kazuaki× Idei, Hiroshi× Ikezoe, Ryuya× Masaharu, Fukuyama× Ejiri, Akira× Taiichi, Shikama× Kariya, Tsuyoshi× Takase, Yuichi× Murakami , Sadayoshi |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Noninductive plasma current start-up using 2nd harmonic electron cyclotron resonance heating (ECRH) with oblique radio frequency (RF) injection is demonstrated in a Q-shu University experiment with steady-state spherical tokamak. A strong transition was observed in the heating and plasma current ramp-up. The initial bulk electron heating regime exhibits Tebulk ∼ 140 eV and no hard x-ray (HXR) emission with a low Ip of ∼15 kA; it abruptly transitions to a regime that exhibits a low Tebulk of ∼10 eV and a strong HXR emission with a high Ip of ∼50 kA. This behavior is distinctly different from that observed in previous fundamental ECRH experiments. The mechanism of the heating and current drive transition are investigated considering wave power absorption and plasma power balance. The results indicate that the transition is caused by the favorable heating of tail electrons where the RF power absorption at the 2nd harmonic increases nearly linearly with Tetail, while the power transfer from the tail electrons to the bulk electrons decreases with 1/Tetail0.5. This causes a rapid transition to a state with high Tetail while reducing Tebulk towards colder ion temperature. The understanding of the transition mechanism helps to consider plasma current start-up using 2nd harmonic ECRH for tokamak reactors such as JT-60 SA and ITER. | |||||
| 書誌情報 |
Plasma Physics and Controlled Fusion 巻 63, 号 10, 発行日 2021-10 |
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| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 0741-3335 | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.1088/1361-6587/ac1838 | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | https://iopscience.iop.org/article/10.1088/1361-6587/ac1838 | |||||
