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Homodyne reflectometer for neutral beam injection interlock on large helical device
http://hdl.handle.net/10655/6362
http://hdl.handle.net/10655/6362553a48b6-8ad3-44f9-9ebb-50355318674c
名前 / ファイル | ライセンス | アクション |
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917 RevSciInstrum_77_10E912.pdf (90.2 kB)
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Item type | 学術雑誌論文 / Journal Article_02(1) | |||||
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公開日 | 2011-03-28 | |||||
タイトル | ||||||
タイトル | Homodyne reflectometer for neutral beam injection interlock on large helical device | |||||
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 | |||||
著者 |
Tanaka, K.
× Tanaka, K.× Ejiri, A.× Ito, Y.× Kawahata, K.× Tokuzawa, T.× Osakabe, M.× Takeiri, Y. |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Neutral beam injection (NBI) into low-density plasmas can cause serious damage to the vacuum vessel wall. It is necessary to stop the NBI when the plasma terminates. This needs a reliable density monitor for NBI interlock. A three-channel homodyne reflectometer, installed on a large helical device was used for an NBI interlock. Microwaves of 28.5, 34.9, and 40.2 GHz were injected with O mode polarization. At present, a simple homodyne detection scheme is used. The reflected signal consists of a dc component due to local and reflected power and an ac component due to fluctuations in the position of the cutoff layer. Since the change in dc signal was very small, the root mean square value of the ac signal was used as the interlock signal. At present the 34.9 GHz O mode channel, whose O mode cutoff density is 1.5×10^19 m^?3, is used for the interlock. The system has been working since the first NBI experiments on LHD in 1999. | |||||
書誌情報 |
en : Review of Scientific Instruments 巻 Vol.77, 号 Issue 10, p. pp.10E912-1 - 10E912-3, 発行日 2006-10-01 |
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出版者 | ||||||
出版者 | American Institute of Physics | |||||
DOI | ||||||
関連タイプ | isIdenticalTo | |||||
識別子タイプ | DOI | |||||
関連識別子 | 10.1063/1.2222169 | |||||
権利 | ||||||
権利情報 | ? 2006 American Institute of Physics. | |||||
関連サイト | ||||||
識別子タイプ | DOI | |||||
関連識別子 | https://doi.org/10.1063/1.2222169 | |||||
関連名称 | Publisher version | |||||
著者版フラグ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 |