Simulation study of ion trapping in PLS storage ring

Ion trapping phenomena in the PLS storage ring have been studied by computer simulation with regard to the tune shift effect of the electron beam. Ions created by strong synchrotron radiation in the vacuum chamber are trapped and accumulated in the electron beam potential and then the beam and the ions move in the potential of each other. Tune shifts in terms of various beam currents show a stable-unstable band structure representing the relationship of the tunes. For the unstable tune values, partial beam filing and clearing electrodes are used to clear the ions