Electron Beam Diagnostics at the Radiation Source ELBE

n the research center Rossendorf, the radiation source ELBE based on a super conducting LINAC is under construction. In the year 2001 the first accelerating module was commissioned. The electron beam parameters like emittance, bunch length, energy spread weremeasured. Here we present results of the measurements as well as the methodics used to make the measurements. In the ELBE injector, where electron beam energy is 250 keV, the emittance was measured with the help of multislit device. Emittance of the accelerated beam was measured by means of quadrupole scan method and is 8 mm×mrad at 77 pC bunch charge. Electron bunch length was measured using coherent transition radiation technique. At the maximum design
bunch charge of 77 pC the RMS bunch length was measured to be 2 ps. A set of online diagnostic systems is also under development. One of them a system of stripline beam position monitors is also described here. A BPM resolution of about 10 µm was achieved using logarithmic amplifier as the core element of the BPM electronics. A system of beam loss monitors based on the RF Heliax cable working as an ionization chamber is intended to be another online diagnostic system.