  We report the results of a low-latency beam phase feed-forward system built
to stabilize the arrival time of a relativistic electron beam. The system was
operated at the Compact Linear Collider (CLIC) Test Facility (CTF3) at CERN
where the beam arrival time was stabilized to approximately 50 fs. The system
latency was 350 ns and the correction bandwidth >23 MHz. The system meets the
requirements for CLIC.
