MCC energy measurement

MCC follows a standard procedure for doing the Hall C beam energy measurement. The basic idea is to setup a dispersive tune. Setting up a clean dispersive tune is usually what takes the most time. Then MCC adjusts the current of the arc dipole string (MBSY3C) to center the beam at the end of the arc on IPM3C17H. From the current one can calculate the beam energy assuming the beam follows the central path. By measuring the positions and angles at the entrance and exit of the dipole arc one can correct for small deviations for the central path. To measure these positions superharp scans are performed 3C07 and 3C17 positions. The beam current for the harp scans is 10 $\mu$A.