Calibration of Beam Position Monitors for an Injection Complex Damping Ring

The calibration of two types of an electrostatic beam position monitor was carried out. Signals from the electrodes are converted into beam coordinates using a nonlinear polynomial transformation, the coefficients of which are calculated using the least squares method. This made it possible to measure the position of the beam with an accuracy better than the required value of 0.1 mm for a single passage of the beam. The mechanical center of the monitor has been linked to external geodetic signs. The calibration result was used with all monitors in the ring based on the assumption that they were all manufactured to the same mechanical accuracy. This made it possible to measure beam parameters with better accuracy than before calibration.