Measurement of Beam Energy Loss in the SPring-8 Synchrotron

In order to observe closed orbit distortion (COD) at some beam energies, an energy-constant period was formed with a time of 100 ms in the region of the energy-ramping period. Using the horizontal COD, energy loss per turn as to beam energy was observed. The observed energy loss was consistent with the estimated energy loss of the synchrotron radiation.