The closed orbit measurement of SRRC booster during ramping

The SRRC booster synchrotron is used to accelerate the electron beam from 50 MeV to 1.3 GeV. The closed orbit of electron beam during ramping was measured. The signals corresponding to the beam positions were picked up by the 23 BPMs around the synchrotron. A control electronic unit was made to control a multiplexer system in order to collect and digitize the signals. During the 50 ms ramping period, the digitized signals were saved into a FIFO in the control electronic unit. Then, these signals were transferred to an IBM/PC for analysis. The result of measured closed orbits is presented in this report.