K
K. Ichikawa
Publications - 7
Citations - 110
K. Ichikawa is an academic researcher. The author has contributed to research in topics: Gyrotron & Harmonic. The author has an hindex of 6, co-authored 7 publications receiving 108 citations.
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Journal ArticleDOI
Development of a medium power, submillimeter wave gyrotron using a 17 T superconducting magnet
Toshitaka Idehara,Y. Shimizu,K. Ichikawa,S. Makino,K. Shibutani,K. Kurahashi,Toshiaki Tatsukawa,I. Ogawa,Y. Okazaki,T. Okamoto +9 more
TL;DR: In this paper, a frequency tunable gyrotron for spectroscopy in the submillimeter wavelength range using a 17 T superconducting magnet has been designed and constructed, which can emit radiation at high frequencies up to 394 GHz (TE041 cavity mode) at the fundamental of the electron cyclotron frequency.
Journal ArticleDOI
Development of submillimeter wave gyrotron using 12 T superconducting magnet
TL;DR: In this paper, the development of a submillimeter wave, high-harmonic gyrotron using a 12 T superconducting magnet is described, which has achieved frequencies as high as 636 GHz (corresponding to a wavelength of 472 μm).
Journal ArticleDOI
Submillimetre wave gyrotron (gyrotron FU IV) for plasma diagnostics
Y. Shimizu,K. Ichikawa,K. Shibutani,K. Kurahashi,T Tatsukawa,Toshitaka Idehara,Isamu Ogawa,Y. Okazaki,T. Okamoto +8 more
TL;DR: In this article, the development of a high frequency, high harmonic gyrotron using a 17 T superconducting magnet was described, which can be tuned from 160 to 440 GHz by the fundamental and extended up to 850 GHz in the second harmonic.
Journal ArticleDOI
High‐frequency, amplitude modulation of a submillimeter wave, medium power gyrotron
Toshitaka Idehara,Y. Shimizu,S. Makino,K. Ichikawa,Toshiaki Tatsukawa,Isamu Ogawa,G. F. Brand +6 more
TL;DR: In this article, the amplitude modulation of the output of a submillimeter wave gyrotron was investigated at frequencies up to several hundred kilohertz with anode modulation levels of only a few percent.
Journal ArticleDOI
Rapid frequency step-switching of a submillimeter wave gyrotron by modulation of the electron beam
TL;DR: In this article, an experimental study of the rapid step-switching of the frequency of a submillimeter wave gyrotron is described and the first experimental results for frequency switching between two fundamental modes and between a fundamental and a second harmonic mode are demonstrated.