Notch Filter in 70 GHz Range for Microwave Plasma Diagnostics
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- NISHIURA Masaki
- National Institute for Fusion Science
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- KUBO Shin
- National Institute for Fusion Science
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- TANAKA Kenji
- National Institute for Fusion Science
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- KOBAYASHI Sakuji
- National Institute for Fusion Science
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- OKADA Kohta
- National Institute for Fusion Science
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- NISHIMURA Teruki
- National Institute for Fusion Science
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- OKADA Koji
- National Institute for Fusion Science
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- KASAHARA Hiroshi
- National Institute for Fusion Science
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- OGASAWARA Shinya
- Nagoya University
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- SHIMOZUMA Takashi
- National Institute for Fusion Science
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- MUTOH Takashi
- National Institute for Fusion Science
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- KAWAHATA Kazuo
- National Institute for Fusion Science
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- SAITO Teruo
- FIR FU, University of Fukui
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- TATEMATSU Yoshinori
- FIR FU, University of Fukui
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- LHD experiment group
- National Institute for Fusion Science
抄録
A notch filter for the rejection of stray light from gigahertz range heating sources was developed to protect a vulnerable microwave plasma diagnostic system. As one of the applications, we consider the installation of the notch filter into the receiver of a collective Thomson scattering diagnostic in the Large Helical Device. Experimental observations indicate that two types of notch filters are required for main and spurious mode rejection; they have very narrow, steep shapes to avoid disturbing the diagnostic signal. On the basis of numerically simulated results, notch filters were fabricated, and their performance was evaluated. An attenuation level of 35 dB at 74.746 GHz with a 3 dB bandwidth of 0.49 GHz is achieved by two pairs of resonator cavities. This attenuation is acceptable in our study.
収録刊行物
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- Plasma and Fusion Research
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Plasma and Fusion Research 8 (0), 2402027-2402027, 2013
一般社団法人 プラズマ・核融合学会
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詳細情報 詳細情報について
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- CRID
- 1390001205255251456
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- NII論文ID
- 130004678529
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- ISSN
- 18806821
- http://id.crossref.org/issn/18806821
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- HANDLE
- 10655/10164
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- IRDB
- Crossref
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- 使用不可