The operational status of Pohang Light Source

Abstract

From the year 2000, the PLS storage ring stores 2.5GeV high-energy electron beam by raising the energy from the 2.0GeV injection energy. The stored current is presently 180mA, which is limited by the available rf energy at 2.5GeV. In May 2000, we succeeded in storing 300mA at 2.0GeV achieving the last design goal of PLS. Further, the new record of the maximum beam current, 450mA, was made in April 2001. At present, PLS has 13 beamlines in operation, 1 beamline under commissioning and 6 beamlines under construction. Other progresses and issues of the PLS operation will be discussed further.

Improved closed orbit measurement system for PLS

“…The settlement of the storage ring tunnel continues at about 3.0mm (hill to valley) per year in PLS [6]. The total deformation has reached presently 19mm compared to the reference elevation established in June 1993.…”

“…Major source of the temperature change comes from the large change of the magnet currents during the regular beam injection. With a novel de-ramping and ramping process for beam injection, thermal shock on magnets reduced significantly [5,6]. Further studies on various thermal effects are in progress to stabilize temperature drifts in the storage ring components.…”