Abstract
Time-resolved studies of intense, relativistic electron beams using a novel subnanosecond Čerenkov electro-optic shutter are described. The technique is applied to the measurements of the electron beam emittance from a multielectrode field emission gun (1.6 MV, 1 kA, 30 ns), and to the study of the stability of a rotating relativistic electron ring (200 kV, 100 A, 1 μs).