Zobrazeno 1 - 10 of 42 pro vyhledávání: '"Sakuji Kobayashi"'
1
Design and Fabrication of 200-GHz Oversized Surface-Wave Oscillator
Autor: Yukihisa Hoshi, Sakuji Kobayashi, Yuta Annaka, Kazuo Ogura, Shin Kubo, Kohji Okada, Takashi Shimozuma, Keiichiro Rachi
Publikováno v: IEEE Transactions on Plasma Science. 49:33-39
A surface-wave oscillator (SWO) is one of the promising terahertz-wave sources based on excitation of a surface wave using an electron beam. The surface wave is formed by a metal periodic structure, and the frequency is determined by the size paramet
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a43a589c8adb8efc8480f898c501e9bd
https://doi.org/10.1109/tps.2020.2998119
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3
Development of off-axis spiral phase mirrors for generating optical vortices in a range of millimeter waves
Autor: Toru Ii Tsujimura, Yuki Goto, Koji Okada, Sakuji Kobayashi, Shin Kubo
Publikováno v: Review of Scientific Instruments 93, 043507 (2022); https://doi.org/10.1063/5.0077893
In this paper, we report the development of off-axis spiral phase mirrors that can be used to generate optical vortices from a range of millimeter waves. An obliquely incident Gaussian beam is reflected from a spiral phase mirror and is converted int
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d38801504345fb2fc73e46d24e3f45b8
http://hdl.handle.net/10655/00013133
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4
Optimized design of polarizers with low ohmic loss and any polarization state for the 28 GHz QUEST ECH/ECCD system
Autor: Hiroshi Idei, Shin Kubo, Sakuji Kobayashi, Toru Ii Tsujimura
Publikováno v: Toru Ii Tsujimura, Hiroshi Idei, Shin Kubo, Sakuji Kobayashi, Optimized design of polarizers with low ohmic loss and any polarization state for the 28GHz QUEST ECH/ECCD system, Fusion Engineering and Design, Volume 114, 2017, Pages 97-101
In a high-power long-pulse millimeter-wave transmission line for electron cyclotron heating and current drive (ECH/ECCD), the ohmic loss on the grooved mirror surface of polarizers is one of the important issues for reducing the transmission loss. In
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c1201475832b9b23006ecada5c7d5410
http://hdl.handle.net/10655/00012836
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5
Oscillation-Starting Conditions for Oversized $G$ -Band (140–220 GHz) Backward Wave Oscillator Driven by Weakly Relativistic Electron Beam
Autor: Kiyoyuki Yambe, Shintaro Nomizu, Kohji Okada, Sakuji Kobayashi, Kosuke Yamazaki, Akihiro Shirai, Shaoyan Gong, Shin Kubo, Takashi Shimozuma, Kazuo Ogura
Publikováno v: IEEE Transactions on Plasma Science. 43:3530-3536
An oversized $G$ -band backward wave oscillator (BWO) driven by a weakly relativistic electron beam less than 100 kV is studied. Rectangular corrugations are used as the slow-wave structure (SWS), which have surface waves with upper cutoff frequencie
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c9ca8eb338d308119c7188f38a12d139
https://doi.org/10.1109/tps.2015.2424993
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6
Development of a Propagating Millimeter-Wave Beam Position and Profile Monitor in the Oversize Corrugated Waveguide Used in an ECRH System
Autor: Yasuo Yoshimura, Yoshinori Mizuno, Y. Ito, Satoshi Ito, Hiromi Takahashi, Hiroe Igami, Takashi Shimozuma, Shin Kubo, Sakuji Kobayashi, Kohta Okada, Takashi Mutoh, Masaki Nishiura
Publikováno v: Journal of Infrared, Millimeter, and Terahertz Waves. 37:87-99
In a high-power electron cyclotron resonance heating (ECRH) system for plasma heating, a long-distance and low-loss transmission system of the millimeter wave is required. A real-time monitor of the millimeter-wave beam position and its intensity pro
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0775acd5113e218a3d24d824818bf329
https://doi.org/10.1007/s10762-015-0196-y
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7
Recent ECRH/ECCD experiments aiming for higher density and temperature operations in the LHD
Autor: Hidenori Takubo, Masaki Osakabe, Katsumi Ida, Yoshinori Mizuno, Ryosuke Seki, Masayuki Yokoyama, Ichihiro Yamada, Toru Ii Tsujimura, Tomohiro Morisaki, Sakuji Kobayashi, Shin Kubo, Ryo Yasuhara, T. Kobayashi, Takashi Shimozuma, Mikiro Yoshinuma, Kenji Tanaka, Satoshi Ohdachi, Yasuo Yoshimura, Hayato Tsuchiya, Hiroe Igami
Publikováno v: EPJ Web of Conferences, Vol 203, p 02001 (2019)
In LHD, real-time control of the incident EC wave polarization and quick response microwave bolometer for monitoring the stray radiations have been developed for efficient and safe operation of the high power and long pulse ECRH/ECCD. As a high power
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8667533e0a507d1deac192934fa111b3
https://doi.org/10.1051/epjconf/201920302001
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8
ECRH-Related Technologies for High-Power and Steady-State Operation in LHD
Autor: K. Ohkubo, H. Igami, S. Kubo, Takashi Notake, H. Takahashi, Tsuyoshi Kariya, Yoshinori Mizuno, Sakuji Kobayashi, Y. Takita, Hiroshi Idei, Tsuyoshi Imai, R. Minami, T. Watari, Takashi Shimozuma, Satoshi Ito, T. Mutoh, M. Sato, Y. Yoshimura
Publikováno v: Fusion Science and Technology. 58:530-538
The electron cyclotron resonance heating (ECRH) system on the Large Helical Device (LHD) has been in stable operation for ∼11 yr in numerous plasma experiments. During this time, many upgrades to the system have been made, such as reinforcement of
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6592d5481d3631d98ecce3032a36d06c
https://doi.org/10.13182/fst58-530
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9
Analysis Technique of Millimeter-Wave Propagating Modes in an Oversized Corrugated Waveguide Using Developed Beam Profile Monitors
Autor: Sakuji Kobayashi, Hiromi Takahashi, Toru Ii Tsujimura, Satoshi Ito, Yoshinori Mizuno, Shin Kubo, Kohta Okada, Hiroe Igami, Takashi Shimozuma, Y. Ito, Yasuo Yoshimura
Publikováno v: Plasma and Fusion Research. 13:3405036-3405036
A mode analysis technique of the millimeter-wave which propagates in the corrugated waveguide of the electron cyclotron resonance heating (ECRH) transmission line is proposed. The technique is based on the signals detected by beam-profile monitors (B
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f9febe767c88bc73ceca9ce807fca096
https://doi.org/10.1585/pfr.13.3405036
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10
Recent Upgrading of ECRH System and Studies to Improve ECRH Performance in the LHD
Autor: Hiroshi Idei, Yoshinori Mizuno, Kenya Kobayashi, Kohta Okada, Satoshi Ito, Kazunobu Nagasaki, Masaki Osakabe, Sakuji Kobayashi, Ryohei Makino, Takashi Mutoh, Hiromi Takahashi, Hiroe Igami, Takashi Shimozuma, Shuji Kamio, Shin Kubo, Shinya Ogasawara, Yasuo Yoshimura
Publikováno v: EPJ Web of Conferences, Vol 87, p 02011 (2015)
This paper reports the recent status of the ECRH system in the LHD and introduces the experimental results that suggest the reasonable effects of the wave-plasma interaction in the plasma boundary including outside the LCFS. With increasing the avail
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::baa788f72aa22142c90d776d96be9073
https://doaj.org/article/9814027a616b4d9cba4002282d5263e1
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