Beam injection study using a new pulsed power supply for the pulsed sextupole magnet at the PF ring

We have fabricated a new power supply optimized for the pulsed sextupole magnet (PSM) at the Photon Factory storage ring in the spring of 2010. To avoid the PSM kick to the injected beam at the second turn, its pulse had a half-sine shape with a full width of about 1.2 μsec, since the revolution period of the PF ring was about 0.6 μsec and the injection timing was adjusted at the peak of the excitation waveform. The beam injection with the new power supply was operated successfully. In addition, a fast-gated camera was installed at the PF ring, by which we could measure turn-by-turn beam profiles of the stored and injected beams. We confirmed that the modulation of the stored beam profile during the injection, which was measured with the pulsed quadrupole injection at the Photon Factory Advanced Ring, was almost disappeared by the PSM injection. (author)