Design of a low-emittance 2.5-GeV pohang light source lattice
The Pohang Light Source (PLS) storage ring is a synchrotron light source with the emittance of 18.9 nm at 2.5 GeV. We designed a new lattice with an achromat of the emittance of 13 nm that may provide more brilliant synchrotron radiation. We investigated dependence of the dynamic aperture on the betatron tune to search for large dynamic aperture in the low-emittance lattice by a simulation method. We examined the dynamic apertures by a tune survey within a specified tune space without and with machine errors. It is also shown that how large is the dynamic aperture in the storage ring after correction of a closed orbit distortion. The operating tune for the low-emittance lattice can be chosen on the view point of dynamic apertures obtained from a tune survey. The low-emittance lattice with the achromat shows the reduced horizontal and vertical beam sizes by 10% and 29% in the positions of insertion devices and by 31% and 52% in the bending magnets than the present lattice, respectively. It is also shown that the low-emittance lattice with 13 nm may provide sufficient dynamic aperture without changing of configuration of magnets in the storage ring.
Dynamic Aperture for High-Brilliance Optics of the Photon Factory Storage Ring
The dynamic apertures in several lattices for the low emittance of the Photon Factory storage ring (PF ring) have been investigated by a simulation method using the code Strategic Accelerator Design (SAD). The dynamic apertures in each lattice without and with machine errors were obtained by a tune survey in the simulation. It was also shown how large are the dynamic apertures compensated after corrections of a closed orbit distortions. The operating tunes in low-emittance lattices can be obtained based on the view point of dynamic apertures obtained from a tune survey. It is shown that a low-emittance 90° cell lattice provides sufficient dynamic aperture after a correction of the closed orbit distortion in the PF ring.
PETRA III: A New High Brilliance Synchrotron Radiation Source at DESY
DESY in Hamburg, Germany, has decided to reconstruct its 2.304 km long storage ring PETRA II into a third generation synchrotron radiation source starting 2007. The synchrotron source will operate at 6 GeV particle energy, 100 mA current and an emittance of 1 nmrad. In the first phase thirteen independent undulator beamlines will be available for user experiments.