  The SLAC mega-electron-volt (MeV) ultrafast electron diffraction (UED)
instrument is a powerful "electron camera" for the study of time-resolved,
ultrafast atomic & molecular dynamics in chemical and solid-state systems. The
UED laser timing synchronization is upgraded to SLAC (Advanced
Telecommunications Computing Architecture) ATCA based femtosecond laser timing
synchronization system. UED radio frequency (RF) gun cavity low level RF (LLRF)
control is also being upgraded to SLAC ATCA based LLRF system to provide
improved performance and maintainability. The new laser timing synchronization
and LLRF control are implemented in one ATCA crate located in the laser room. A
2nd ATCA crate is set up to monitor the Klystron and sub-booster performance.
With the ATCA based RF control system, the laser timing jitter has achieved 10
fs. The UED operation beam rate is being upgraded from 180 Hz to 360 Hz, which
paves the way for a further upgrade of operation beam rate to 1 kHz in the
future. In this paper, we present design details and characterization results
of the implementation.
