Status of muon kicker system at J-PARC

The muon kicker system is used to separate the muon pulses and feed them to two experimental areas (D1, D2) simultaneously. Beam operation with the kicker system started in winter 2011. Dividing the muon beam into two single-pulsed beams was successful, but anti-noise measures were required. Later, the kicker noise level was drastically improved through refining both the ground lines of the kicker system and the detectors. Figure 1 shows μe-decay spectra with kicker on/off. However, the kicker noise level is still high according to the S/N ratio of some detectors. Further measures to reduce the kicker noise are contrived. On the other hand, the reduction in the rise time of the kicker current for high-intensity beams with longer bunches is in progress. (author)