The Taiwan Photon Source (TPS) is one of the world’s brightest synchrotron X-ray sources geared toward world-class academic research. This accelerator consists of a low-emittance synchrotron storage ring of 518.4 meters in circumference and a booster ring that are designed in a concentric fashion and housed in a donut-shaped building. 

The phase-I beamlines will be available to user in beams of a low emittance and 2016 and will serve scientists worldwide. The TPS is designed to emphasize electron a great brilliance.  The TPS storage ring comprises 24 double-bend achromat (DBA) cells, with six straight sections of 12 meters and eighteen straight sections of 7 meters in length. The TPS uses two sets of KEKB type superconducting RF cavities to achieve an electron current of 500 mA in a top-up injection mode and to diminish the high-order-mode instability excited by the electron beam.

TPS parameters

Energy [GeV]


Current [mA]


Circumference [m]


Natural horizontal emittance [nm · rad]


Critical energy of bending magnets [keV]


Cell units

24 DBA



Radiofrequency [MHz]


Straight sections

12m x 6

7m x 18

National Synchrotron Radiation Research Center

101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu, Taiwan 30076