Design Consideration of a Booster for Taiwan Photon Source

After more than 10 years´ operation and expansion, the Taiwan Light Source (TLS) of National Synchrotron Radiation Research Center (NSRRC) reaches very stable operation condition. The storage ring has better than 96% of beam availability annually. There are 6 Insertion Devices (IDs) in a six-folds symmetric machine and three superconducting wigglers are going to be installed in achromatic sections. Two superconducting IDs and one Superconducting RF (SRF) cavity were installed in recent year, which intended to push the photon energy to hard x-ray regime and double the photon flux with better beam quality. Beamlines and experimental stations occupied all over the experimental area. The uproar for more beamlines in higher photon energy with higher brightness was frequently transpired from users´ community. The NSRRC proposed a new design and construction timetable for a median-energy light source, Taiwan Photon Source (TPS). This paper will present two draft designs of booster and the considerations of the design criteria for new booster to work with a very low-emittance and top-up injected storage ring.