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Improved design of an ITER equatorial EC launcher

K. Takahashi, K. Kajiwara, N. Kobayashi, A. Kasugai, K. Sakamoto2008年被引用 25Nuclear FusionIF 3出版社

New design improvements for an ITER equatorial EC launcher are described. A design of the front shield modules was evaluated analytically. The results indicate that these modules can withstand the electromagnetic forces induced by plasma disruption and vertical plasma motion. The steering mirror mock-up including the spiral cooling tubes was fabricated based on the present design with application of the hot isostatic pressing technique to bond the copper alloy mirror body and the embedded stainless steel cooling tubes. The test of water flow was carried out and the expected flow rate was successfully obtained. A quasi-optical (QO) transmission layout has been proposed instead of the waveguide lines. The advantage of this option is possibly to increase the reliability in terms of fabrication and refurbishment. According to the beam propagation analysis, it is verified that transmission loss at the QO region is 1.1%–2.2%, which is comparable to the reference design. The peak heat load on the steering mirror surface could be reduced by 55%, which relaxes the mirror design.

日本語訳

ITER赤道面ECランチャーの新しい設計改良について述べる。フロントシールドモジュールの設計を解析的に評価した。その結果、これらのモジュールはプラズマ崩壊およびプラズマ垂直運動によって誘起される電磁力に耐え得ることが示された。スパイラル冷却管を含むミラーの駆動機構モックアップは、銅合金ミラー本体と埋め込みステンレス鋼冷却管を接合するための熱間静水圧加圧技術を適用した本設計に基づいて製作された。水流試験を実施し、期待される流量が得られた。導波管ラインの代わりに準光学伝送路の配置が提案された。この選択肢の利点は、製作および交換の観点から信頼性を向上させ得ることである。ビーム伝播解析によれば、準光学領域での伝送損失は1.1%~2.2%であり、参照設計と同等であることが検証された。ステアリングミラー表面のピーク熱負荷は55%低減可能であり、これによりミラー設計の制約が緩和される。

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