Status of the PLS-II magnet design and fabrication

The only 3rd generation synchrotron light source in Korea, which is operated by the Pohang Accelerator Laboratory (PAL), is planning a major upgrade of the PLS to meet the more demanding requirements of the synchrotron light users. The main features of the major upgrade are (1) increasing the electron beam energy from 2.5 GeV to 3.0 GeV for higher energy X-ray photons, (2) decreasing the electron beam emittance from 18.9 nm to 5.8 nm to increase the photon brilliance, and (3) increasing the number of straight sections to increase the number of insertion devices from 10 to 20 to meet the demand for insertion devices. In the upgraded PLS (PLS-II), there will be 24 combined function dipole magnets, 96 quadrupole magnets, and 96 sextupole magnets with some auxiliary magnets for electron beam injection. In this report, the physical design features, and the mechanical aspects of the magnet design are described.