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Journal Articles

Development of cold isostatic pressing graphite module for a heat-resistant lower hybrid current drive antenna

Maebara, Sunao; Goniche, M.*; Kazarian, F.*; Seki, Masami; Ikeda, Yoshitaka; Imai, Tsuyoshi*; Beaumont, B.*

Review of Scientific Instruments, 76(5), p.053501_1 - 053501_7, 2005/05

Times Cited Count：1 Percentile：9.98(Instruments & Instrumentation)

Development of a plasma facing module using Cold Isostatic Pressing Graphite (CIPG) had been done for a heat-resistant LHCD antenna. A thin stainless film (10m), molybdenum film (10m) and copper film (50m) are laid to overlap each other on the CIPG materials, the CIPG surfaces were successfully coated with copper layer by diffusion bonding method. This module has four waveguides and a water cooling channel, the length is 206 mm. High power long pulse operation was successfully achieved up to 250 kW (125 MW/m $^{2}$ )/700s. The module has been successfully tested at a RF power density which is equivalent, in terms of RF electric field (5kV/cm), to the one proposed for the LHCD antenna of ITER-FEAT. The outgassing rate of the copper-coated CIPG is estimated to be 3.2-5.110 $^{-6}$ Pa.m $^{3}$ /s.m $^{2}$ at 100 $^{circ}$ C, it is assessed that a pumping system is not required to evacuate the pressure in the LHCD antenna.

Journal Articles

Outgassing of lower hybrid antenna modules during high-power long-pulse transmission

Goniche, M.*; Kazarian, F.*; Bibet, P.*; Maebara, Sunao; Seki, Masami; Ikeda, Yoshitaka; Imai, Tsuyoshi*

Journal of Vacuum Science and Technology A, 23(1), p.55 - 65, 2005/01

https://doi.org/10.1116/1.1821587

Times Cited Count：2 Percentile：9.16(Materials Science, Coatings & Films)

Outgassing rates have been measured for long duration (100-4700 seconds) of RF transmission at high power density (50-200 MW/m $^{2}$ ) for waveguides made of OFHC copper, dispersoid copper, copper-coated carbon fiber composite and copper-coated graphite. The measurements were performed on multi-waveguide(2 to 8)mockups, using a test bed facility equipped with a 3.7 GHz klystron. The effect on the outgassing rate of waveguide surface temperature and of initial wall gas loading('conditioning'), is examined. It is concluded that an outgassing rate of 110 $^{-5}$ Pam $^{3}$ s $^{-1}$ m $^{-2}$ and 510 $^{-5}$ Pam $^{3}$ s $^{-1}$ m $^{-2}$ at 300 $^{circ}$ C and 400 $^{circ}$ C respectively, can be expected for the tested material. Based on these measurement results, it is further concluded that no additional pumping will be needed for the LHRF antenna proposed for ITER.

Journal Articles

Development and operation of the Lower Hybrid Range of Frequency system on JT-60U

Seki, Masami; Ikeda, Yoshitaka; Maebara, Sunao; Moriyama, Shinichi; Naito, Osamu; Anno, Katsuto; Hiranai, Shinichi; Shimono, Mitsugu; Shinozaki, Shinichi; Terakado, Masayuki; et al.

Fusion Science and Technology (JT-60 Special Issue), 42(2-3), p.452 - 466, 2002/09

https://doi.org/10.13182/FST02-A240

Times Cited Count：14 Percentile：65.01(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

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

Journal Articles

Outgassing measurement of the waveguide module for a steady state LHCD antenna

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

Fusion Engineering and Design, 30, p.357 - 367, 1995/00

https://doi.org/10.1016/0920-3796(95)00413-F

Times Cited Count：4 Percentile：48.65(Nuclear Science & Technology)

no abstracts in English

Journal Articles