Calculation and calibration of eight-stripline beam energy spread monitor

A beam energy spread monitor(BESM) with eight stripline electrodes in four-axis symmetry is designed for high-brightness injector in Hefei Light Source, to achieve the non-intercept measurement of beam energy spread. The formula to get the beam transverse size from BESMs electrode signals is figured out. With the sensitivity of the BESM, impedance matching, the time domain and frequence domain response of the stripline electrodes, etc., being considered, the physical structure of this eight-stripline BESM, such as the electrodes open-angle, radius, length, is got. The eight-stripline BESM is calibrated with a calibration system by antenna method, and the offset between the electrical center and the mechanical center, the position sensitivity and the quadrupole compo