PERFORMANCE OF PLS BEAM POSITION MONITOR SYSTEM

Since its commissioning in 1994, many beamlines including high-brightness undulators have been constructed and operated in the PLS (Pohang Light Source). For high-quality experiments, the positions of electron and photon beams should be maintained very stable. The stability of the beams are measured by Beam Position Monitors (BPM's), and they should provide accurate and reliable beam-position information. Recently, we have started to examine and upgrade the performance of the electron BPM's. This is to obtain required resolution and reliability for achieving stable beam position. In this article, we discuss the performance of the PLS BPM's and their application to the improvement of beam stability.