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Development of capacitively-coupled combline antennas for current drive in tokamaks
https://repo.qst.go.jp/records/74804
https://repo.qst.go.jp/records/7480460525a4f-ff3c-4abf-90f8-e782cb2d216b
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2019-03-18 | |||||
| タイトル | ||||||
| タイトル | Development of capacitively-coupled combline antennas for current drive in tokamaks | |||||
| 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 |
Yajima, S.
× Yajima, S.× Takase, Y.× Tajiri, Y.× Takei, Y.× Tsujii, N.× Yamazaki, H.× P. Moeller, C.× 新屋, 貴浩× Shinya, Takahiro |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Abstract. The capacitively-coupled combline (CCC) antenna has been developed for current drive by the lower hybrid wave (LHW) on the TST-2 spherical tokamak. The combline antenna was developed to satisfy the requirements of high directionality, low re ectivity, and simple feeding. Since the combline antenna makes use of mutual coupling between neighboring elements, only the rst and the last elements are connected to external feedlines. RF powers and power densities of the order of 100kW and 1MW/m2 can be achieved easily in small antennas of the order of 0.1m2. The two CCC antennas installed in TST-2 (outboard-launch and top-launch) excite toroidal refractive index (n) spectra peaked around 5 with the frequency of 200 MHz. Wave excitation calculation using a nite element code shows that the excited power of the n = 5 LHW component increases rapidly when the plasma cuto density layer (where ne = 5 1014 m????3) becomes closer than 27mm from the antenna surface, in agreement with experiment. Experimentally, the density prole in front of the antenna can be controlled by adjusting the side limiter location or antenna-plasma distance, and should be optimized for antenna-plasma coupling, since too high coupling results in a broadened and less directional n spectrum, and too low coupling results in a less ecient power coupling. Using these antennas, successful ST plasma start-up and Ip ramp-up to over 25 kA (about 1/4 of the nominal Ip for OH operation) have been achieved with RF power of less than 100kW in about 40 ms. |
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| 書誌情報 |
Nuclear Fusion 巻 59, 号 6, p. 066004, 発行日 2019-03 |
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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/ab0f61 | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | https://iopscience.iop.org/article/10.1088/1741-4326/ab0f61 | |||||
