ACCELERATION CAVITY AND ACCELERATION CAVITY SYSTEM

To suppress the leakage of high-frequency energy within a vacuum vessel, form an intended accelerating electric field in an acceleration gap within the vacuum vessel, and accelerate the charged particle beam as designed.SOLUTION: An acceleration cavity includes a vacuum vessel 11 that is maintained in a vacuum state and includes a beam path 17 through which a charged particle beam passes, and an acceleration gap 18 at a position facing the beam path, an antenna 12 that is installed in the vacuum vessel to guide high frequency energy into the vacuum vessel and accelerate the charged particle beam by forming an accelerating electric field in an acceleration gap, a focusing magnet 13 that is installed outside the vacuum vessel and focuses the charged particle beam flowing within the beam path, and a high frequency blocking structure 14 that is installed in the beam path of the vacuum vessel to block leakage of high frequency energy within the vacuum vessel.SELECTED DRAWING: Figure 1 【課題】真空容器内の高周波エネルギの漏洩を抑制して真空容器内の加速ギャップに意図した加速電場を形成し、荷電粒子ビームを設計通りに加速することができること。【解決手段】真空状態に保持されると共に、荷電粒子ビームが通過するビーム通路１７を備え、このビーム通路を臨む位置に加速ギャップ１８を備えた真空容器１１と、真空容器内に設置されて高周波エネルギを真空容器内に導き、加速ギャップに加速電場を形成して荷電粒子ビームを加速させるアンテナ１２と、真空容器外に設置されて、ビーム通路内を流れる荷電粒子ビームを収束させる収束磁石１３と、真空容器のビーム通路に設置されて、真空容器内の高周波エネルギの漏洩を遮断する高周波遮断構造１４と、を有して構成されたものである。【選択図】図１