Commissioning of SAGA Light Source

The SAGA Light Source (SAGA-LS) consists of a 250-MeV electron linac injector and a 1.4-GeV storage ring with eight double-bend (DB) cell and eight 2.93-m long straight sections. The DB cell structure with a distributed dispersion system was chosen to produce a compact and low cost ring of 75.6-m long circumference. The machine installation began on September 29, 2003. The ring magnets of steel laminated structure, vacuum chambers made of aluminium alloy, pumping systems and temperature controlled cooling water systems for the linac accelerating tubes etc. were installed in March, 2004. The 250-MeV linac, a 499.8-MHz ring rf damped cavity, rf klystrons, a beam transport system for injection and their controlled systems were installed in July, 2004. The commissioning began on August 25, 2004. The first 250-MeV beam was accelerated on September 29. The beam size is 1-mm in diameter and the energy spread is 0.9 % (FWHM). The first synchrotron light of stored beam was observed on November 12. Energy ramping process up to 1.4-GeV was performed in a minute.