Q-band high-performance notch filters at 56 and 77 GHz notches for versatile fusion plasma diagnostics

• NISHIURA, Masaki

• SHIMIZU, T.

• Kobayashi, S.

• TOKUZAWA, Tokihiko

• Ichinose, K.

• KUBO, Shin

抄録

0000-0003-2410-7550

A six-pole Q-band waveguide filter with a notch frequency above the Q-band has been developed for plasma diagnostics. The previous paper [Nishiura et al., J. Instrum. 10, C12014 (2015)] reported that the notch frequency exists within the standard band. In this study, the newly required notch filter extends the function, which prevents a thorny wave from being mixed into an instrument beyond the standard bandwidth of the waveguide. The mode control technique for cavities realizes a deep and sharp filter shape for Q-band notch filters with 56 and 77 GHz notches, respectively. The former filter has an attenuation more than 50 dB at 56.05 GHz and a bandwidth of 1.1 GHz at −3 dB. The latter filter has an attenuation more than 55 dB at 76.95 GHz and a bandwidth of 1.6 GHz at −3 dB. The electron cyclotron emission imaging and the electron cyclotron emission (ECE) diagnostics for the Q-band implemented a pair of the fabricated filters and demonstrated the ECE measurement successfully in the intense stray radiation from a 56 GHz gyrotron.

収録刊行物

• Review of Scientific Instruments

  Review of Scientific Instruments 92 (3), 034711-, 2021-03-12

  AIP Publishing

キーワード

• Instrumentation

詳細情報

• CRID: 1050290537412788224
• NII論文ID: 120007180075
• NII書誌ID: AA00817730
• ISSN: 00346748
• ISSN: 10897623
• DOI: 10.1063/5.0041243
• HANDLE: 10655/00012782
• Web Site: https://nifs-repository.repo.nii.ac.jp/records/10805
• Web Site: https://pubs.aip.org/aip/rsi/article-pdf/doi/10.1063/5.0041243/13864884/034711_1_online.pdf
• 本文言語コード: en
• 資料種別: journal article
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