  A new powerful longitudinal diagnostics is being developed for the two CERN's
antiproton machines, the Antiproton Decelerator (AD) and the Extra Low ENergy
ANtiproton (ELENA) ring. The longitudinal diagnostics receives data from the
Low-Level Radiofrequency (LLRF) system via optical fiber. Real time processing
of gigabit data-streams is enabled by its computational resources and real-time
operating system. Measurement of intensity, bunch length and turn-by-turn bunch
profiles are available for bunched beams. Intensity, momentum spread and
average frequency will soon be measured for debunched beams. The system will
provide essential input to setup and monitor RF and cooling systems. It will
also be used by operators to monitor each machine's performances and the
overall efficiency of the antiproton chain. This paper shows the data
acquisition/processing mechanism and preliminary bunched beam results for AD.
Next steps and plans for exporting the system to other CERN machines equipped
with the same LLRF system are also mentioned.
