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Your search keyword '"Ryosuke, Ikeda"' showing total 6 results
Start Over Author "Ryosuke, Ikeda" Journal 2013 38th international conference on infrared, millimeter, and terahertz waves (irmmw-thz)
6 results on '"Ryosuke, Ikeda"'

1. 460 GHz second harmonic gyrotrons for a 700 MHz DNP-NMR spectroscopy

Author

Yuusuke Yamaguchi, Yoshinori Tatematsu, M. Toda, Yoh Matsuki, Toshimichi Fujiwara, Teruo Saito, Keisuke Ueda, Isamu Ogawa, Ryosuke Ikeda, and Toshitaka Idehara

Subjects
Materials science, business.industry, Terahertz radiation, Bandwidth (signal processing), Nuclear magnetic resonance spectroscopy, law.invention, Nuclear magnetic resonance, law, Gyrotron, Optoelectronics, High harmonic generation, business, Spectroscopy, Frequency modulation
Abstract

Development of two 460 GHz second harmonic gyrotrons for 700 MHz DNP-NMR spectroscopy is presented. One gyrotron is frequency-fixed and the other is frequency tunable in the bandwidth of 1.5 GHz. In addition, the former has a function of frequency modulation.

Published
2013
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2. Application of a potential profile for controlling the beam laminarity in a magnetron injection gun

Author

Yoshinori Tatematsu, Teruo Saito, Ryosuke Ikeda, Yuusuke Yamaguchi, Isamu Ogawa, and Toshitaka Idehara

Subjects
Materials science, Physics::Instrumentation and Detectors, Terahertz radiation, business.industry, Laminar flow, Cathode, law.invention, Anode, Physics::Fluid Dynamics, Optics, Physics::Plasma Physics, law, Gyrotron, Cavity magnetron, Cathode ray, Physics::Accelerator Physics, business, Beam (structure)
Abstract

A method is described to form a laminar electron beam for a high power gyrotron. An optimum potential profile is investigated to adjust each electron trajectory in between cathode and 1st anode. A high quality laminar beam is realized with a wide operation window.

Published
2013
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3. Power improvement on Gyrotron FU CW GIII

Author

Ryosuke Ikeda, Ryoichi Ichioka, Teruo Saito, Isamu Ogawa, Tatsuru Kawase, Yoshinori Tatematsu, Toshitaka Idehara, and Yuusuke Yamaguchi

Subjects
Physics, business.industry, Oscillation, Terahertz radiation, Power (physics), law.invention, Nuclear magnetic resonance, Optics, Quality (physics), law, Gyrotron, Cathode ray, business, Electron gun
Abstract

Gyrotron FU CW GIII has been developed as an improved version of Gyrotron FU CW GII. A new electron gun has been designed to improve the quality of an electron beam. After careful set up of FU CW GIII, the maximum oscillation power of 420 W was obtained, which is more than 5 times larger than that obtained on Gyrotron FU CW GII.

Published
2013
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4. Long pulse operation of a dual frequency gyrotron for JT-60SA

Author

Yasuhisa Oda, Koji Takahashi, Masayuki Sawahata, Ryosuke Ikeda, Takayuki Kobayashi, Masayuki Terakado, Kazuo Hoshino, Y. Sato, J. Hinata, Shinichi Moriyama, Ken Kajiwara, Kenji Yokokura, Shinichi Hiranai, Kenji Wada, and Keishi Sakamoto

Subjects
Physics, Long pulse, Terahertz radiation, business.industry, Stray radiation, Cavity loss, Power (physics), law.invention, Optics, law, Gyrotron, Dual frequency, Dielectric loss, business
Abstract

Long pulse operation of a dual frequency gyrotron for JT-60SA, which can oscillate both 110 GHz and 138 GHz waves, was started. Oscillations at ~0.4 MW for 2 s (both frequencies) and 0.7 MW for 1 s (110 GHz) were obtained, so far. Temperature increase in the cavity, the output window and some components, which absorb stray radiation in the gyrotron, were measured and cavity loss power and the dielectric loss tangent of the output window were evaluated. Heat loads in the gyrotron measured so far were acceptable for long pulse operation at an output power of 1 MW.

Published
2013
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5. Progress of high power long pulse gyrotron for fusion application

Author

Ryosuke Ikeda, Takayuki Kobayashi, Keishi Sakamoto, Yasuhisa Oda, Shinichi Moriyama, Ken Kajiwara, Koji Takahashi, and Kazuo Hayashi

Subjects
Physics, Fusion, Switched-mode power supply, business.industry, Terahertz radiation, Anode, Power (physics), law.invention, Modulation, law, Gyrotron, Optoelectronics, business, Gaussian beam
Abstract

Recent progress of JAEA high power long pulse gyrotron is reported. Multi-frequency oscillations and their Gaussian beam outputs are demonstrated at 170 GHz, 137 GHz and 104 GHz. For the full power modulation, clear 5kHz modulation was demonstrated using double anode switching. Furthermore, novel anode power supply system was fabricated to simplify the gyrotron power supply system.

Published
2013
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6. Development of broadband frequency tunable gyrotron operating at the fundamental resonance for 600 MHz DNP-NMR spectroscopy

Author

Yoshinori Tatematsu, Tomohiro Kanemaki, Toshitaka Idehara, Isamu Ogawa, Yuusuke Yamaguchi, Teruo Saito, and Ryosuke Ikeda

Subjects
Materials science, Terahertz radiation, business.industry, Bandwidth (signal processing), Nuclear magnetic resonance spectroscopy, law.invention, Resonator, Nuclear magnetic resonance, law, Gyrotron, Broadband, Cavity magnetron, Optoelectronics, business
Abstract

A Broadband frequency tunable gyrotron operating at fundamental resonance for 600 MHz DNP-NMR has been developed. A cavity resonator and a magnetron injection gun are newly designed. In the preliminary experiments, the continuously frequency tuning bandwidth was 1.3 GHz and the output power was increased up to 100 W.

Published
2013
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