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Measurement results of the impedance of the RF-cavity at the RCS in J-PARC

Shobuda, Yoshihiro   ; Harada, Hiroyuki  ; Hotchi, Hideaki  

The kicker impedance dominates at the RCS in J-PARC. Recently, we observe beam instabilities, which are not explained by the kicker. As a candidate causing the beam instability, the impedance of the RF-cavity is measured. The longitudinal impedance is measured by stretching a single-wire inside the cavity. On the other hand, the measurement of the transverse impedance is done by horizontally shifting the single-wire, due to the accuracy problem. The measured impedance is too low to explain the beam instability.

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