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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:10.49(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 (10$$mu$$m), molybdenum film (10$$mu$$m) and copper film (50$$mu$$m) 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 3.2-5.1$$times$$10$$^{-6}$$ 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

 Times Cited Count:2 Percentile:9.78(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 1$$times$$10$$^{-5}$$ Pam$$^{3}$$s$$^{-1}$$m$$^{-2}$$ and 5$$times$$10$$^{-5}$$ 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

Outgassing of plasma facing antenna front for lower hybrid wave launcher

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

Fusion Engineering and Design, 49-50, p.269 - 273, 2000/11

 Times Cited Count:4 Percentile:33.53(Nuclear Science & Technology)

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