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国際熱核融合実験炉・ITERに用いられる大電流加速器用FRP絶縁管

FRP insulator column for high current accelerator of ITER: International thermonuclear experimental reactor

井上 多加志

Inoue, Takashi

国際熱核融合炉(ITER)のNBI加熱装置に用いられる加速器では、1MV, 40Aの大電力でイオンビームを加速するために直径約1.8mの大口径絶縁管が必要である。しかしながらセラミック、冬季などの無機材料でこのような大口径絶縁管を製作した例はなく、大口径セラミック絶縁管の開発を進めるとともに、ガラス繊維強化エポキシ(FRP)製大口径絶縁管を用いて1MeV水素負イオンビームの開発研究を推進してきた。開発当初はFRPからの脱ガスに続く絶縁破壊が頻発したが、真空,金属, FRPの接点である三重点近傍FRPにエポキシ溶融を見出し、大型金属構造物による三重点の電界強度低減を図った結果、1MV高電圧の長時間保持に成功し、ITER要求性能:ビームエネルギー1MeV、負イオン電流密度200A/m$$^{2}$$のところ、短パルスながら0.98MeV、185A/m$$^{2}$$の水素負イオン加速を達成している。

In ITER as a thermonuclear fusion experimental reactor being conducted by an international project, a large bore insulator ring of about 1.8 m in diameter is required for generation of 1 MeV, 40 A ion beam for plasma heating by Neutral Beam Injector. At JAEA, R&D has been carried out for development of such large bore insulator ring made of ceramics, and in parallel, ion beam experiments have been carried out with insulator rings made of FRP. The experiments have troubled with frequent high voltage breakdowns after outgas from FRP. Finding melt epoxy traces at triple junction (interface of vacuum, metal and FRP as dielectric material), local stress at the triple junction has been mitigated by mounting a large metal structure, so called stress ring. As a result, acceleration of 0.98 MeV, 185 A/m$$^{2}$$ hydrogen negative ion beam has successfully achieved in short pulses, where the requirement by ITER is 1 MeV and 200 A/m$$^{2}$$.

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