  At the Fermilab A0 photoinjector facility, bunch-length measurements of the
laser micropulse and the e-beam micropulse have been done in the past with a
fast single-sweep module of the Hamamatsu C5680 streak camera with an intrinsic
shot-to-shot trigger jitter of 10-20ps. We have upgraded the camera system with
the synchroscan module tuned to 81.25MHz to provide synchronous summing
capability with less than 1.5ps FWHM trigger jitter and a phase-locked delay
box to provide phase stability of ~1ps over 10s of minutes. These steps allowed
us to measure both the UV laser pulse train at 263nm and the e-beam via optical
transition radiation (OTR). Due to the low electron beam energies and OTR
signals, we typically summed over 50 micropulses with 0.25-1nC per micropulse.
The phase-locked delay box allowed us to assess chromatic temporal effects and
instigated another upgrade to an all-mirror input optics barrel. In addition,
we added a slow sweep horizontal deflection plug-in unit to provide dual-sweep
capability for the streak camera. We report on a series of measurements made
during the commissioning of these upgrades including bunch-length and phase
effects using the emittance exchange beamline and simultaneous imaging of a UV
drive laser component, OTR, and the 800nm diagnostics laser.
