The Siam Photon Source has continuously been upgraded to improve its performance. The energy of stored electrons has been increased from 1.0 GeV to 1.2 GeV. The beam lifetime has been increased greatly to 23 hours at 100 mA, comparing to its designed value of 6 hours. The development of the light source has focused on the preparation work for the production of hard X‐rays from a superconducting magnet wiggler. More beamlines have been designed and are under constructions. An existing beamline for photoemission beamline (BL4) has been modified to cover wider spectral range of undulator radiation. Three more X‐ray beamlines are being built for XAS, PX and SAXS/WAXS experiments. An IR microspectroscopy is also under construction.

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