S-LSR　静電ビームポジションモニター

The static beam position monitors for a small ion storage ring S-LSR are being developed now.The monitors are installed at the chamber for a bending magnet because of the limited available space.The monitor is composed of four electrodes whose shape is a right triangle and dimensition is 100(mm)times 200(mm).The shape of the monitor apeture is octagon,and distance between upper electrons and lower electrodes is 46+-0.3(mm).The position information of the monitors is calibrated with a test chamber.Two methods for position identification are proposed.One is Difference over Sum method,another is Log Ratio method.The linerity about +-50(mm)was realized by the latter signal identification method.This region is the full length of the monitor electrode