Development of microwave-assisted, laser-induced breakdown spectroscopy without a microwave cavity or waveguide

Oba, Masaki; Miyabe, Masabumi; Akaoka, Katsuaki; Wakaida, Ikuo

Japanese Journal of Applied Physics, 59(6), p.062001_1 - 062001_6, 2020/06

https://doi.org/10.35848/1347-4065/ab8b3f

Using a semiconductor microwave source and a coaxial cable for microwave transmission, a compact microwave-assisted, laser-induced breakdown spectroscopy system without a microwave cavity or waveguide was developed. Several types of electrode heads were tested, so that the emission intensity was 50 times larger than without microwave. The limit of the enhancement effect was also found.

Development of a 972MHz circurator for the J-PARC linac, 1

Suganuma, Kazuaki; Anami, Shozo*; Chishiro, Etsuji; Kubota, Chikashi*; Shinohara, Kibatsu*; Tsuruoka, Shigetsugu*; Yamaguchi, Seiya*

Proceedings of 1st Annual Meeting of Particle Accelerator Society of Japan and 29th Linear Accelerator Meeting in Japan, p.275 - 277, 2004/08

A 972MHz circlator is currently developed. In the high-power test of the prototype,rf breakdown was observed at the matching post. Rf characterristics obtained by simulations and low-power tests will be presented.

High power experiments of remote steering launcher for electron cyclotron heating and current drive

Takahashi, Koji; Moeller, C. P.*; Sakamoto, Keishi; Hayashi, Kenichi*; Imai, Tsuyoshi

Fusion Engineering and Design, 65(4), p.589 - 598, 2003/07

https://doi.org/10.1016/S0920-3796(03)00042-5

High power radiation experiments of a remote steering launcher for an EC H&CD system were carried out to study the characteristic of the rf beam steering and transmission. The remote steering launcher consists of a 4.632m corrugated square waveguide (45.7 45.7mm) and a movable flat mirror which is placed at the input of the waveguide. Measurements were made in the range 0-10 at a frequency of 170GHz. The measured radiation pattern is clearly a Gaussian-like distribution, which is in agreement with the low power measurements. A steering capability of up to 10 was experimentally confirmed. Transmission and radiation of 0.5 MW-3.0 sec and 0.2 MW-10.0 sec pulses were successfully demonstrated over a steering angle range of 0-10. No arcing was observed during the experiments and no damage to the waveguide was found after the experiments were finished. We confirmed that remote steering was a possibly alternative scheme of rf beam steering for EC H&CD.

Development of all-metal antenna for ICRF system in next generation tokamaks

Moriyama, Shinichi; Fujii, Tsuneyuki; Kimura, Haruyuki; Arai, Hiroyuki*; Ota, K.*

Proceedings of the 18th IEEE/NPSS Symposium on Fusion Engineering (SOFE '99), p.399 - 402, 1999/00

no abstracts in English

Performance test of lower hybrid waveguide under long/high-RF power transmission

Seki, Masami; Obara, Kenjiro; Maebara, Sunao; Ikeda, Yoshitaka; Imai, Tsuyoshi; Nagashima, Takashi; Goniche, M.*; J.Brossaud*; C.Barral*; G.Berger-By*; et al.

JAERI-Research 96-025, 55 Pages, 1996/06

JAERI-Research-96-025.pdf:2.06MB

no abstracts in English

Measurement of secondary electron emission coefficient of wall materials using auger electron spectromter

Hiroki, S.; ; ; Murakami, Yoshio

Shinku, 30(1), p.14 - 21, 1987/01

https://doi.org/10.3131/jvsj.30.14

no abstracts in English

Excitation of ICRF waves in tokamaks by waveguide launcher

; ;

Fusion Technology, 7, p.301 - 310, 1985/00

no abstracts in English

Progress in development of a wide band polarizer for ECCD system in JT-60SA

Horie, Naoyuki*; Sai, Takuma*; Omori, Kohei*; Saigusa, Mikio*; Kobayashi, Takayuki; Moriyama, Shinichi; Arata, Hiroshi*; Uno, Tsuyoshi*

no journal, , 

no abstracts in English