The recent
study of the marriage of the Serafini-Luiten scheme for dynamic expansion
of an ultra-short beam into an optimized, ellipsoidal shaped beam of
uniform density, with emittance compensation, has produced stimulus
for an experiment at the SPARC injector in Fall 2005. We review preparations
for this experiment. We evaluate the production ultra-fast uv pulses,
cathode emission time, and high intensity laser effects. We discuss
the measurable quantities in this experiment and their appropriate diagnosis
including the time-resolved observation of ellipsoidal beam shape at
low energy. A scheme based on gating of Cerenkov radiation produced
at an aerogel for time-resolved measurements is proposed. Future measurements
at high energy based on fs resolution RF sweepers are discussed. The
prospects for using the very low longitudinal emittance beam in a future
bunch compressor for producing 10 micron long beams are evaluated.