Experimental study of the main ring transition crossing

The longitudinal emittance increase and the particle loss through transition as a function of the initial emittance in the main ring was studied. A phase mismatch at injection was used to change the initial longitudinal emittance and measurements were taken for different intensities and RF voltages around transition. The results of measurements are in good agreement with simulation results from ESME and indicate that nonlinear effects dominate the transition crossing in the main ring under the present operating conditions ( epsilon /sub L/>or=0.14 eV-s).<>