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JT-60SAにおけるNBI加熱装置のビームライン予備設計

Preliminary design of beamline components for JT-60SA NBI heating system

藻垣 和彦; 椛澤 稔; 小又 将夫; 河合 視己人; 池田 佳隆; 大槻 信一*; 佐藤 藤雄*

Mogaki, Kazuhiko; Kazawa, Minoru; Komata, Masao; Kawai, Mikito; Ikeda, Yoshitaka; Otsuki, Shinichi*; Sato, Fujio*

JT-60SA用NBI加熱装置のビームラインの予備検討として、P-NBIとJT-60SAクライオスタッドの取合い検討,NBI機器の磁気シールドの追加検討,N-NBIビームライン水平入射位置の下げ変更検討及び既存NBI機器の解体検討を3次元CADを用いて行った。JT-60SAでは真空容器とNBI機器との間にクライオスタッドが入るため、NBIドリフト部を短くする必要があるが、高速シャッタの撤去及びFRP材の変換フランジの新規製作により、ドリフト全長をJT-60SAの要求に合わせることが可能であることを示した。JT-60SAでの漏洩磁場対策に対しては、機器の位置的な干渉調査から、磁気飽和を回避できる厚み30mmの磁気シールド板を中性化セル外装周りに追加可能なことを明らかとした。N-NBIビームラインの水平位置変更(600m下げ)に関しては、イオン源タンクのベース変更,カロリメータの上部移設,中性化セル部支持柱の新規製作で可能との見通しを得た。さらに既存NBI設備の撤去に関して、作業を効率的に行うための最小限の解体範囲及び解体手順を明らかとした。

The modification of the beamline components for JT-60SA NBI heating system has been preliminarily studied by means of three-dimensional Computer Aided Design (CAD) technique, such as the connection between positive ion-based NBI (P-NBI) port and the cryostat of JT-60SA vacuum vessel, an additional magnetic shielding plate, the down-shift of the negative ion-based NBI (N-NBI), and disassembly of the present NBI system. The length of drift duct for JT-60SA is to be shorted because the cryostat is to be inserted between the JT-60SA vacuum vessel and the P-NBI beamline. It is found that the removal of the fast shutter and a newly designed connection flange made of FRP is a solution to keep the same function in the shorten drift duct. The position interference with the 3D CAD indicates that the available space between the neutralizer cell and the ion tank is 30 mm, which is enough space to install a thick mild steel to avoid the magnetic saturation. On the N-NBI, the down-shift of 0.6 m is realized by shorting the basement of ion tank, reversing the shaft of the movable calorimeter and exchanging the support structure of the neutralizer cell. Moreover, the minimum dissection components and the disassembly procedure have been proposed to effectively disassemble the present NBI system.

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