Measurement scheme of kicker impedances via beam-induced voltages of coaxial cables

ビームがキッカーケーブルに誘起する電圧を使ったキッカーインピーダンスの評価法

菖蒲田 義博   ; 入江 吉郎*; 外山 毅*; 神谷 潤一郎   ; 渡辺 真朗  

Shobuda, Yoshihiro; Irie, Yoshiro*; Toyama, Takeshi*; Kamiya, Junichiro; Watanabe, Masao

A new theory, which satisfies the causality condition, is developed to describe impedances of kicker magnets with coaxial cables. The theoretical results well describe measurement results, which are obtained by standard wire methods. On the other hand, when beams pass through the kicker, voltages are induced at the terminals of coaxial cables. In other words, by analyzing the voltages, the kicker impedance for the beams can be obtained. The observed impedances are consistent with the theoretical results. The theory describes the impedance for non-relativistic beams, as well. The theoretical, simulation and measurement results indicate that the horizontal kicker impedance is drastically reduced by the non-relativistic effect.