Effects of the SRRC second prototype dipole magnet on the SRRC ring

After correcting the SRRC (Synchrotron Radiation Research Center) second prototype combined function dipole magnet to the nominal condition, the integrated gradient strength and the integrated sextupole strength remain larger than the specification. The excessive integrated gradient strength can be overcome by retuning the triple quadrupoles. The integrated sextupole strength is composed mainly of two systematic thin sextupole lenses on both edges of the magnet. The integrated sextupole strength inside the magnet is less than that specified. The strengths of the ring regular sextupoles are readjusted accordingly. After retuning and adjusting chromaticities, the dynamic aperture tracking is studied with and without multipole field. It is found that the second prototype combined function dipole magnet is acceptable.<>