The Complete 3-D coupled RF-thermal-structural-RF analysis procedure for a normal conducting accelerating structure for high intensity hadron linac

大強度ハドロンリニアック常伝導加速構造の完全3次元高周波熱構造高周波結合解析手法

Joshi, S. C.*; Paramonov, V.*; Skassyrskaya, A.*; 林崎 規託*; 池上 雅紀*; 山崎 良成

Joshi, S. C.*; Paramonov, V.*; Skassyrskaya, A.*; Hayashizaki, Noriyosu*; Ikegami, Masanori*; Yamazaki, Yoshishige

デューティー因子や連続運転大強度陽子線形加速器、中でも常伝導加速構造においては、特に入念な3次元高周波熱構造解析が必要とされる。そこでは、熱除去能力がデューティー因子を決定するといっても過言ではない。有限要素法を用いた解析手法を詳述するとともに、歪みの導出に重要な役割を果たす境界条件について議論する。また、構造の不均一過熱による周波数変化を論ずるとともに、遷移過程における振る舞いをも記述する。

The normal conducting coupled-cavity linac with the Annular Coupled Structure (ACS) is adopted for 190-400 MeV part of high intensity proton linac for the JAERI/KEK Joint Project. The operating frequency is 972 MHz and the 23 modules will be constructed. The basic configuration is based on that investigated for L-band (1296 MHz) in the previous Japan Hadron Project research. However, the structure design is revised and optimized in order to meet requirements of reliability, operation efficiency and cost reduction for the newly proposed Joint Project. As the results of development, the transverse dimensions of the ACS tank are reduced sufficiently with the improvement in RF characteristics. The structure segmentation and essential points of the design are described.