Zobrazeno 1 - 10
of 35
pro vyhledávání: '"Keiichi Kamada"'
Publikováno v:
IEEE Transactions on Plasma Science. 48:3650-3655
In this study, cylindrical intense electron beams were injected into a rectangular tube. The beam cross section profiles were observed along the propagation path. The single-beam profile was deformed periodically. The center of the beam cross section
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::10f9b486c433c76427c09fa39dc106f8
https://doi.org/10.1109/tps.2020.3022678
https://doi.org/10.1109/tps.2020.3022678
Autor:
Keiichi Kamada, A. S. Sergeev, Ritoku Ando, H. Shirasaka, M. Kamada, Irina V. Zotova, K. Kurihara, Naum S. Ginzburg, Roman M. Rozental
Publikováno v:
Optics Communications. 231:303-308
To increase the peak power of superradiance pulses it has been suggested that the electron bunch profile be optimised. It is shown that an electron energy chirp can result in considerable increase in the peak power as compared to a flat-top energy pu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cea4fe0ea2d14cb223f788abc03d9eae
https://doi.org/10.1016/j.optcom.2003.12.048
https://doi.org/10.1016/j.optcom.2003.12.048
Autor:
N. Toyosugi, Cha Yeol Lee, Masaru Masuzaki, Tsuguhiro Watanabe, Ritoku Ando, Hiroshi Tsukuda, Keiichi Kamada
Publikováno v:
International Journal of Infrared and Millimeter Waves. 22:1147-1162
A linear analysis is described on stabilities driven by an intense relativistic electron beam in an infinitely long, plasma-filled, and dielectric-lined circular waveguide immersed in a finite strength axial magnetic field. A dispersion equation is d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1d118982d8cb73dad87cbc65332d7377
https://doi.org/10.1023/a:1015059014466
https://doi.org/10.1023/a:1015059014466
Autor:
Keiichi Kamada, Sunao Kawasaki, Hiroshi Yoshida, Masaru Masuzaki, Fumiyasu Tamagawa, C. Y. Lee, Ritoku Ando, Kouichi Nawashiro
Publikováno v:
International Journal of Infrared and Millimeter Waves. 21:1441-1449
A relativistic electron beam (500 keV, 200 A, 10 ns) generated magnetically tunable microwave radiation in a frequency range of 9-13 GHz when it is injected into an X-band rectangular waveguide immersed in a uniform axial magnetic field (4-10 kG). Th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6d706ce1a876db6a50e2c3bff9581a65
https://doi.org/10.1023/a:1026457024180
https://doi.org/10.1023/a:1026457024180
Publikováno v:
IEEE Transactions on Plasma Science. 27:682-687
High-power broad-band millimeter-wave radiation is emitted from a plasma in a strong Langmuir turbulence state driven by an intense relativistic electron beam. We measured directivity and spectrum of this radiation with a filter-bank spectrometer, a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::43481c3ef553accb86eba91923ae8447
https://doi.org/10.1109/27.774672
https://doi.org/10.1109/27.774672
Publikováno v:
Journal of the Physical Society of Japan. 67:1273-1280
Our recent works, which were based on the spectroscopic measurement of strong high frequency electric fields in a plasma, showed that the plasma became a strong Langmuir turbulence state when an intense relativistic electron beam was injected into it
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b5e9c5c5552fc9ff604e442d6f3e96ef
https://doi.org/10.1143/jpsj.67.1273
https://doi.org/10.1143/jpsj.67.1273
Autor:
Keiichi Kamada, Kouichi Nawashiro, Sunao Kawasaki, Hisayoshi Igarashi, Satiharu Kizu, Fumiyasu Tamagawa, Masaru Masuzaki, Ritoku Ando, C. Y. Lee
Publikováno v:
International Journal of Infrared and Millimeter Waves. 19:1317-1324
A mildly relativistic electron beam (500keV, 200A, 10ns) injected into an X-band rectangular waveguide immersed in a uniform axial magnetic field (4-10kG) produced magnetically tunable microwave radiation in the 9-13 GHz frequency range with an estim
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::82349ed8d3c521e77921e5657bf6d277
https://doi.org/10.1023/a:1022663504082
https://doi.org/10.1023/a:1022663504082
Autor:
Masayuki Yoshikawa, Ken–ichi Kobayashi, Masaru Masuzaki, Ritoku Ando, Keiichi Kamada, Hiroshi Morita, H. Koguchi
Publikováno v:
Journal of the Physical Society of Japan. 65:2518-2521
The production of a broadband microwave pulse from the interaction of an intense relativistic electron beam (IREB) with a plasma was studied experimentally. The beam-to-plasma density ratio ( n b / n p ) is an important parameter for the beam-plasma
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1ef7443d02bd665ca11aaf22890282d9
https://doi.org/10.1143/jpsj.65.2518
https://doi.org/10.1143/jpsj.65.2518
Publikováno v:
Journal of the Physical Society of Japan. 65:2081-2086
A direct experimental evidence was given for that high-power broadband microwaves radiated from the plasma at the injection of an intense relativistic electron beam strongly correlates to the electric fields in cavitons induced in the plasma. This ra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a91380c6b049656e3e974327eea59879
https://doi.org/10.1143/jpsj.65.2081
https://doi.org/10.1143/jpsj.65.2081
Publikováno v:
IEEE Transactions on Plasma Science. 31:297-299
It is observed that the length of a coaxial cavity strongly affects the induced gap voltage and the level of automodulation. For high-frequency automodulation for a beam with slow rise-time, a series of cavities with decreasing lengths is proposed.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9efd474f0631b1c2f5117de173accb7e
https://doi.org/10.1109/tps.2003.810181
https://doi.org/10.1109/tps.2003.810181