Development of beam position monitor for test beam of BEPC Ⅱ

Three stripline beam position monitors and some feed-throughs were developed to measure the position of beam non-imterceptively in test beam facility. After three stripline beam position monitors were produced,calibrations of the monitors were carried out on a workbench,which has high precision and is controlled by a computer. Then two monitors were installed at the beam line and some experiments were carried out. Four 1 mm thickness stainless steel strips are main modules of the monitor,signals induced in these strips reflect the position of the beam bunch．Calibration coefficient,system characteristic impedance and port transmission coefficient of monitor are introduced in this paper.