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Development of EC launcher and diamond window for ITER

ITER用ECランチャー及びダイアモンド窓の開発

高橋 幸司; 坂本 慶司; 今井 剛; 春日井 敦; Heidinger, R.*; Thumm, M.*; Moeller, C. P.*

Takahashi, Koji; Sakamoto, Keishi; Imai, Tsuyoshi; Kasugai, Atsushi; Heidinger, R.*; Thumm, M.*; Moeller, C. P.*

ECランチャーには先端可動型と遠隔駆動型がある。前者のキーコンポーネントである先端ミラー(銅合金)について1ビーム当たり1MW,CWという条件の下に熱解析を行い、ミラー表面で最高温度333$$^{circ}$$C,熱応力136MPaが生じることが判明した。応力は許容応力(200MPa)以下である。後者についてはRF伝送試験を行い、設計通りの放射角度範囲(-12$$^{circ}$$$$<$$$$theta$$$$<$$12$$^{circ}$$)で95%以上という高効率伝送に成功した。中性子を照射したダイアモンド窓(10$$^{21}$$n/m$$^{2}$$:ITERでの想定量より2$$sim$$3桁多い)について、RF伝送試験と圧力試験を行い、0.48MW-30sec及び0.2MW-132secの伝送と耐圧力0.4MPa(ITERの設計条件の2倍)を実証し、ダイアモンド窓がITERで使用できる見通しを得た。

A front steering (FS) launcher and a remote steering (RS) one have been studied for ITER. In the analysis of a mirror(Cu alloy) for FS launcher, max. temperature of 333$$^{circ}$$C and max. induced stress of 136MPa, less than allowable stress(200MPa), were obtained at the mirror surface under 1MW/1line in CW operation. The efficient transmission ($$eta$$$$>$$95%) at -12$$^{circ}$$$$<$$$$theta$$$$<$$12$$^{circ}$$ and 170GHz was performed for both polarizations in the experiments of a square corrugated waveguide for the RS launcher. RF and pressure tests of the diamond window irradiated by neutron were carried under JA/EU(FZK) collaboration. Neutron fluence of the window was 10$$^{21}$$n/m$$^{2}$$, whereas the estimated annual fluence at the window position is 10$$^{18}$$$$sim$$10$$^{19}$$n/m$$^{2}$$. Transmission of 0.48MW-30sec and 0.2MW-132sec were performed. It was successfully demonstrated that the irradiated window withstood 0.4MPa, which was twice higher than the ITER requirement. Diamond windows are applicable for ITER.

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