Commissioning of the PLS 2 GeV storage ring

In Pohang, Korea, construction of a third-generation 2 GeV light source has been in progress since 1988. Installation of the storage ring components started in March 1993 and was completed in August 1994. Initially, only two super-periods out of 12 were baked out in-situ. From September to the end of 1994, the machine commissioning had been carried out. The initial injection energy for the commissioning was chosen to be 1.4 GeV because at this energy the injection kicker magnet can make a design bump, -21 mm. On September 8, the injected beam from the injector linear accelerator was circulated in storage ring more than 500 turns without RF. After accumulating the beam up to 76 mA on October 20, the injection energy was changed to the design value which is 2.0 GeV. At 2.0 GeV, amount of the bumped orbit which the kicker magnet can generate is -15 mm. Additional -6 mm bump is produced by four horizontal corrector magnets located on each side of the injection straight section. On December 24, 1994, the beam was stacked up to 300 mA, exceeding the commissioning goal of 100 mA. From January to March 1995, the ring had been shut down for in-situ bakeout. Since April, the second commissioning has been in progress. The PLS facility will be open to users in July 1995. In this paper, we present the current status of the PLS storage ring commissioning and the future plan for normal operation