Speaker
Gianluigi Casse
(Uni Liverpool)
Description
Silicon sensors will probably be the choice for the inner tracker detectors of
the experiments in the anticipated LHC luminosity upgrade (Super LHC,
SLHC). These sensors will have to survive a radiation environment almost
an order of magnitude higher than within the already challenging LHC
trackers. The final cumulated fluence will depend on the integrated
luminosity targeted by the experiments, but an increase of a factor of 5 to
10 is expected. A significant contribution to the radiation damage of the
sensors in the tracker volume is due to backscattered neutrons. Simulations
show that the neutron flux equals the charged particle flux emerging from
the interactions at a radial distance of about 25cm from the beam axis.
Irradiation with neutrons are therefore a necessary test for proving the
ability of prototype silicon detectors to survive the SLHC fluences. Short strip
microstrip detectors made on p-type silicon substrate for optimised radiation
hardness, have been irradiated with fast neutrons to various fluences up to
3×10 15 cm −2. They have been characterised in term of charge collection
efficiency with LHC speed electronics (40MHz). The results are here
presented in the light of a possible upgrade scenario of the ATLAS tracker.
Author
Gianluigi Casse
(Uni Liverpool)
