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JT-60SA用負イオンNBI加熱装置の受熱機器の熱解析予備検討

Preliminary thermal analyses of the beamline components in JT-60SA neutral beam injection system

小又 将夫; 藻垣 和彦; 椛澤 稔; 花田 磨砂也; 池田 佳隆

Komata, Masao; Mogaki, Kazuhiko; Kazawa, Minoru; Hanada, Masaya; Ikeda, Yoshitaka

2014年のファーストプラズマ着火が計画されているJT-60SA用負イオンNBI加熱装置においては、既存JT-60U用負イオンNBI加熱装置を最大限利用し、10MWの重水素ビームを100秒間入射することが要求されている。そこで、約3MWのD$$^{0}$$ビームを21秒間入射に成功している既存のJT-60U用負イオンNBI加熱装置の受熱機器の熱解析を行い、さらなる長パルス入射の可能性を調べた。3次元熱解析コード(AMPS)を用いて行った結果、NBIポート内の第4ビームリミタとイオン源内のプラズマ電極及び加速電極以外のすべての既存の受熱機器は、JT-60SA用の10MW, 100秒入射に使用できることがわかった。第4ビーミリミタ及びプラズマ電極に関しては、強制冷却方式を採用する必要がある。また、加速電極(接地電極)に関しては、電極熱負荷を現在の半分程度に低減する必要がある。

In JT-60 Super Advanced (JT-60 SA) where the first plasma will be in 2014, D$$^{0}$$ beams of 10 MW are designed to be injected for 100 s. The negative-ion-based neutral beam injection (N-NBI) system in JT-60U will be upgraded from existing JT-60U N-NBI system while the modification of existing components should be minimized. The feasibility on the further long pulse operation of the existing beamline components in the JT-60U N-NBI system, which has successfully injected 3.2 MW for 21 s, has been studied. The thermal characteristic of the beamline components during long pulse operation was estimated by a three-dimension analysis code (AMPS). As the result, it is found that most of the beamline components except for the 4th beam limiter without water cooling and a plasma grid and acceleration grids in the negative ion source are to be available without modification in the JT-60 SA N-NBI system. For the 4th beam limiter, the water cooling is required to withstand the power loading. For the acceleration grids, the power loading of the grounded grid should be reduced to a half of the present value to realize a 10 MW injection for 100 s.

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