Longitudinal injection transients in an electron storage ring

We present the results of an experimental study of the longitudinal beam dy namics at injection in the advanced light source, an electron storage ring. By measuring the longitudinal bunch distribution following injection using a streak camera, we were able to study several useful and interesting effe cts as well as improve overall injection efficiency. These include measurem ent and correction of the phase and energy offsets at injection, measuremen t of the injected bunch length and energy spread, direct observation of pha se space filamentation due to the spread in synchrotron frequencies, and me asurement of the effective damping rate of the bunch shape including radiat ion damping and decoherence. We have also made some initial studies of the decay of an uncaptured beam at injection which may provide a novel means of measuring the radiation loss per turn.