Zobrazeno 1 - 10
of 31
pro vyhledávání: '"Masaki Tsuneoka"'
Publikováno v:
IEEJ Transactions on Industry Applications. 128:1239-1245
High-frequency noise induced to a ground system causes disturbance to electronic devices. However, there have been only a few studies into the high-frequency impedance characteristics of ground systems from the viewpoint of safe and stable functionin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f48e04be87775c32a6cf5a739903670c
https://doi.org/10.1541/ieejias.128.1239
https://doi.org/10.1541/ieejias.128.1239
Autor:
Tsuyoshi Kariya, Keishi Sakamoto, Koji Takahashi, K. Kajiwara, Masaki Tsuneoka, Hiroaki Shoyama, Yoshitaka Ikeda, Tsuneyuki Fujii, Atsushi Kasugai, Y. Ikeda, Yoshika Mitsunaka, Tsuyoshi Imai
Publikováno v:
Fusion Engineering and Design. 53:399-406
A 110 GHz-Gaussian beam output gyrotron with chemical vapor deposition (CVD) diamond window was developed for electron cyclotron heating and current drive on JT-60U. A stable Gaussian output beam power of 1.0 MW for 2 s was obtained with depressed co
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::054757daa43304531433ca5c6919504a
https://doi.org/10.1016/s0920-3796(00)00516-0
https://doi.org/10.1016/s0920-3796(00)00516-0
Autor:
Takumi Yamamoto, T. Oikawa, K. Yokokura, Akihiko Isayama, Shinichi Shinozaki, K. Haga, K. Kajiwara, K. Anno, S. Hiranai, Masaki Tsuneoka, S. Moriyama, Kiyotaka Hamamatsu, Y. Ikeda, Atsushi Kasugai, Mitsugu Shimono, Masami Seki, Shunsuke Ide, Koji Takahashi, T. Fujii, O. Naito, Kenkichi Ushigusa, A. Kajiyama, M. Terakado, Tsuyoshi Imai, Keishi Sakamoto, Yutaka Kamada
Publikováno v:
Fusion Engineering and Design. 53:351-363
The 110 GHz 1 MW electron cyclotron range of frequency (ECRF) system was designed and constructed on JT-60U to locally heat and control the plasmas. The gyrotron has a diamond window to transmit RF power with Gaussian mode, which is easily transforme
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c48ea5e4927c64e7b75abe3aba9e60c8
https://doi.org/10.1016/s0920-3796(00)00511-1
https://doi.org/10.1016/s0920-3796(00)00511-1
Publikováno v:
Fusion Engineering and Design. 45:197-207
This paper describes the JA home team design of the ITER ECRF power supply system whose capacity is 200 MVA. The system has 16 power supply units to drive 68 gyrotrons with total radio frequency power of 68 MW for plasma heating, current drive and pl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4dc18e313ee35aef17042e0f4c31fd02
https://doi.org/10.1016/s0920-3796(99)00005-8
https://doi.org/10.1016/s0920-3796(99)00005-8
Autor:
Masaki Tsuneoka, Keishi Sakamoto, Nobuyoshi Kamioka, Hiroshi Hara, Y. Ikeda, Hideo Fujita, Toshio Yoshida, Toshimitsu Iiyama, Masayuki Ishibashi, Mashiro Yasuda, Tsuyoshi Imai, Atsushi Kasugai, Toshio Asaka
Publikováno v:
International Journal of Electronics. 86:233-243
A high efficiency and high power dc main power supply for the collector potential depression (CPD) gyrotron was developed and operated successfully with a real CPD gyrotron. The capacity of the power supply is 5 MW, 100 kV output voltage and 50 A max
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cc0c0e9768e64eb52a0445ab889ec31f
https://doi.org/10.1080/002072199133607
https://doi.org/10.1080/002072199133607
Autor:
Atsushi Kasugai, Tsuyoshi Imai, Koji Takahashi, Yoshika Mitsunaka, Masaki Tsuneoka, Keishi Sakamoto, Tsuyoshi Kariya
Publikováno v:
Review of Scientific Instruments. 70:208-212
A large sized synthetic diamond window assembly was installed on a 170 GHz gyrotron. An aperture and a thickness of the window are 83 and 2.23 mm, respectively, whose edge was directly cooled by water. Gyrotron performances of 520 kW at 6.2 s and 450
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4000e3752de72f5ce31cdfee420ca402
https://doi.org/10.1063/1.1149567
https://doi.org/10.1063/1.1149567
Autor:
O. Braz, Masaki Tsuneoka, Keishi Sakamoto, A. Beale, Atsushi Kasugai, D. C. Ballington, R. S. Sussman, J. R. Brandon, Tsuyoshi Imai, Tsuyoshi Kariya, Koji Takahashi, Manfred Thumm
Publikováno v:
Review of Scientific Instruments. 69:2160-2165
To satisfy the electrical and thermomechanical requirements for a continuous wave millimeter wave beam transmission, a window assembly using a large size synthesized diamond disk has been developed. Such window systems are needed as a vacuum barrier
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d1263fad8943cf524796c8942f11b743
https://doi.org/10.1063/1.1148916
https://doi.org/10.1063/1.1148916
Autor:
Yoshika Mitsunaka, Koji Takahashi, Atsushi Kasugai, Takashi Nagashima, Y. Okazaki, Keishi Sakamoto, M. Ohta, Yasuyuki Itoh, Y. Ikeda, Tsuyoshi Imai, K. Hayashi, Tsuyoshi Kariya, Yosuke Hirata, Masaki Tsuneoka
Publikováno v:
International Journal of Infrared and Millimeter Waves. 18:1637-1654
A development of 170GHz/500kW level gyrotron was carried out as R&D work of ITER. The oscillation mode is TE31,8. In a short pulse experiment, the maximum power of 750kW was achieved at 85kV/40A. The efficiency was 22%. In the depressed collector ope
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::260b6134269da7fcdd7cc49089bcf557
https://doi.org/10.1007/bf02678276
https://doi.org/10.1007/bf02678276
Autor:
Masaki Tsuneoka, Atsushi Kasugai, Tsuyoshi Imai, O. Braz, Koji Takahashi, Manfred Thumm, Keishi Sakamoto
Publikováno v:
International Journal of Infrared and Millimeter Waves. 18:1495-1503
In order to check the usability of large-size CVD (Chemical Vapor Deposition) diamond disks for high power millimeter wave vacuum barrier windows at room temperature (T = 293 K) a first series of experiments, using a 170 GHz, 0.4 MW, 0.2 s JAERI/Tosh
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::12a9c20e62a572e461d78c83259a48d4
https://doi.org/10.1007/bf02678307
https://doi.org/10.1007/bf02678307
Autor:
H. Nara, M. Yasuda, Masaki Tsuneoka, T. Yoshida, N. Kamioka, Toshimitsu Iiyama, Keishi Sakamoto, Toshio Asaka, Atsushi Kasugai, H. Fujita, Tsuyoshi Imai, M. Ishibashi, Takashi Nagashima
Publikováno v:
Fusion Engineering and Design. 36:461-469
A new type of power supply system for a gyrotron with collector potential depression (CPD) to enhance gyrotron efficiency was developed. The power supply system is composed of a main power supply (MPS) and an acceleration power supply (APS). The APS
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6ec0293c3569c15fdfa76eac153ec72f
https://doi.org/10.1016/s0920-3796(97)00024-0
https://doi.org/10.1016/s0920-3796(97)00024-0