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Report No.

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*

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.



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Category:Materials Science, Coatings & Films



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