BEAM DIAGNOSTICS WITH A STREAK CAMERA IN PLS

Various modulated longitudinal oscillations due to RF noises have been observed with a streak camera at the end of the diagnostic beam line in the Pohang Light Source (PLS) storage ring. The same modulated oscillations can be also detected by a spectrum analyzer and the longitu-dinal feedback system. Strong quadrupole and sextupole mode oscillations as well as the dipole mode can be found with the streak camera. Moreover, the bunch length beat-ing and the transverse beam size increase are observed. We report the various observations done by the streak camera in the PLS storage ring and explain where these abnormal behaviors come from.