@article{oai:nifs-repository.repo.nii.ac.jp:00010805,
 author = {NISHIURA,  Masaki and SHIMIZU, T. and Kobayashi, S. and TOKUZAWA,  Tokihiko and Ichinose, K. and KUBO,  Shin},
 issue = {3},
 journal = {Review of Scientific Instruments},
 month = {Mar},
 note = {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.},
 title = {Q-band high-performance notch filters at 56 and 77 GHz notches for versatile fusion plasma diagnostics},
 volume = {92},
 year = {2021}
}