Fri, Apr, 27th 2012, 11:00
Bat 703, p 135, CEA Saclay, Orme des Merisiers
Picosecond timing at the LHC
Rockefeller University, NY and INFN/Pisa


As the LHC enters the 2012 run, the challenge of dealing with several dozen proton-proton

collisions within a tiny interval of a few hundred picoseconds have implications for future 

evolution of the detectors. Whereas the radiation doses currently encountered are

consistent with what was anticipated, pileup has already exceeded the level anticipated

in the LHC design, due to the 50 nsec running mode now being adopted.


In order for event time to be an effective tool in resolving pileup, aspects of the event

(i.e. charged particle arrival ) time should be resolved at the level of several picoseconds.

We describe a project started 4 years ago using deep depleted, Silicon avalanche photodiodes

for direct charged particle detection. We report results fusing LNF, PSI and ATF test beams

which have demonstrated performance consistent with these requirements.
Contact : Stephane PLATCHKOV