BPM SYSTEM OF ELECTRON LINAC AND IT'S APPLICATION

The beam profile measurement (BPM) system of 30 MeV linac in Beijing Free Electron LaserLaboratory (BFELL) is described. The BPM consists of remote control phosphor screen, four TV cam-eras. an image video signal processor and a computer system. The profile, position, emittance and dis-tribution of electron beam for injection and output of the linac have been measured with it. The spatialresolution of the system is approximately 0.1 mm. The precision of measurement of beam width isabout 0.05 mm that meets the requirement of BFEL. The system have been used on line over two yearsand have meeted the needs for test of BFEL.