Direct Observation of Transverse Dynamic Aperture for High-Brillant Optic at the Photon Factory Storage Ring

The transverse dynamic apertures for the high-brilliant optics were directly observed at two operating points of betatron tunes near 3rd order coupling resonance at the Photon Factory storage ring (PF-ring). The measurements were made on the quarter of the transverse plane using the fast kicker magnets and the turn-by-turn monitor system. The dynamic apertures were preciously estimated through the fine control of kicker voltage and turn-by-turn observation of beam loss after the kick. The measured transverse dynamic apertures were quantitatively compared with the prediction of the computer simulation based on the realistic lattice model.